 big bore pistons
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I installed the D&D big bore kit this weekend and took an interesting picture of the pistons that I had on hand. from the left they are a Wiseco 10.5:1, and a JE 12:1, and the stock triumph (with some extra carbon).  nikasil barrels - 
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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I forgot an interesting note - I weighed each of the pistons (the sets were very close in weight). big range between the 3 types.
Wiseco - 318.93 grams
Triumph - 361.45 grams
JE -276.40 grams
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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3/4 Throttle
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So did you go with the JE or Wiseco Pistons? Could you tell any quality differences between the Wiseco and the JE Pistons? 
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Re: big bore pistons
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Fe Butt
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Fe Butt
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12:1 you are gonna probably need an octane additive. I don't think the pump gas is gonna cut it at that ratio.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: big bore pistons
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Should be Riding
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Should be Riding
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I would think 93 would be ok if you could find it
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: big bore pistons
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Fe Butt
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Fe Butt
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for 12:1? maybe but borderline. I had a Norton that I had to put octane boost in even with premium 94 octane. It actually called for 98 octane on the gas cap.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: big bore pistons
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Joined: Aug 2007
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Should be Riding
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Should be Riding
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There have been a few times I had to run less than 90 on mine with wiseco pistons with no ill affect, is it really that big of a jump from 10 to 12?
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: big bore pistons
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Fe Butt
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Fe Butt
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Yeah it's a pretty big jump. I'm suprised that with 10.5:1 some guys still run mid-grade. I used to run 10.5:1 in the TR6C and it didn't like 89 octane. It would run but it would ping under a load. It was OK if I was just putting and not putting a demand on the engine. With 92 or better it was OK under all conditions and that was just the difference between 9:1 and 10.5:1.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: big bore pistons
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Joined: Jan 2008
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Learned Hand
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OP
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I went with JE's. They came with the Kit from D&D. It's odd but JE's website does not list this application.
I was told that they would be okay on premium gas, since everything here now is E10 or higher, there is my additive.
this project is only done up to the head back on and the cam gear done. Work is interfering until next weekend. I am really jonesing to start it up.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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Loquacious
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D&D (Pensacola) did my BB. I talked with Dink (owner/service manager) about the pistons prior to the work. He assured me that the high compression ones would be fine on premium pump gas. I ended up going with the Wiseco 10.5:1 and have been running mid-grade with no problem at all for over a year since the BB.
The bike is running the best ever right now after some carb tweaking. One of the reasons I decided on the Wiseco was my goal (which I told Dink) was the most torque I could get in the middle rpm range. I didn't care about Hp at redline. They ran multiple dyno runs. The result was 65.54 ft./lb. at 3408 rpm. I couldn't be happier.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: big bore pistons
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Learned Hand
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I finally got the bike back together (because it got above freezing this weekend) Started right up with the first push of the button. went together pretty easy with all of the tips on this site and Dinquas site. While it was warming up I noticed a exhaust leak and found that one of the header flanges was cracked. So I had to yank it back off of the bike. A local welder will have it fixed this week. THen I will have to wait until the weather is good enough to ride.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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Loquacious
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wait till you ride it. gonna be hard to take it easy
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: big bore pistons
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Quote:
wait till you ride it. gonna be hard to take it easy
+1. I kept creeping up in speed and rpms on my ride home from Norfolk on Saturday. Whacked into it a few times just 'cause, but for the most part tried really hard to stay to the right and putt up I-95... but with well under 1/4 throttle the bike kept creeping up to 70mph +.
She WANTS to run. You can tell.
--Jaeger
NEUTIQUAM ERRO
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Re: big bore pistons
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Worn Saddle
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Worn Saddle
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Quote:
I finally got the bike back together (because it got above freezing this weekend) Started right up with the first push of the button. went together pretty easy with all of the tips on this site and Dinquas site. While it was warming up I noticed a exhaust leak and found that one of the header flanges was cracked. So I had to yank it back off of the bike. A local welder will have it fixed this week. THen I will have to wait until the weather is good enough to ride.
ah ha, my evil plan is working....more and more bb's being done in garages. Soon, we will take over the bike world, then we can raise all he11.
A word to the wise is not necessary. It is the stupid ones who need the advice.
Pat
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Re: big bore pistons
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hey pat, next is you need to do a stroker crank and make a write up for us. lets go stop being lazy. i am not asking you to do an 1100 or 1200 kit, just that little 988  Frank
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: big bore pistons
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who makes a 1100 or 1200 kit?
Its more fun to be ridin'! I'm still ridin
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Re: big bore pistons
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Learned Hand
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Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: big bore pistons
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I would like to see what those who have taken it to stroker level have to say about it. There has been quite a bit posted about the 904 and 1100 big bores, but I don't see much in the way of experiences with the stroker kits.
Anyone here running a stroked America or Speedmaster?
2018 FLHCS
2014 Surly Straggler - 16,000 miles and counting!
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 Re: big bore pistons
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If everybody would pool their money and spring for the stroker kit (any of them), i'll be more than happy to provide the labor and use my bike to test it and give a review. 
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: big bore pistons
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Fe Butt
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Fe Butt
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Then enough money would also have to be pooled to do my bike so we can verify the results. After all we would have to be sure before others took this great risk. Just here to take a bullet for the team ya know. Don't forget we would need enough for a couple sets of flat slide carbs too. 
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: big bore pistons
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Loquacious
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bonnevilleperformance.com has the 1100 and 1200 kits. i can honestly say within the next few years i will prob do one of the larger kits. there is a guy who did the 988 on his bonny and makes 90hp and 70Ibs. thats impressive imho. cheaper to biuld a motor than buy a new bike right? at least thats how i justify it.
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: big bore pistons
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Learned Hand
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Quote:
If everybody would pool their money and spring for the stroker kit (any of them), i'll be more than happy to provide the labor and use my bike to test it and give a review.
I have a wiseco 988 kit that I took in trade for some machine work a couple of years ago. I have no intent to install it. (if I have go into the bottom end to change the crank, I might as well be boring the case to accept the 1200 barrels) I would be willing to let the 988 kit go pretty cheap or trade, as it is just collecting dust. All you would need is the crankshaft itself. although rods might be a good idea.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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So what's cheap, and what would you trade for?
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: big bore pistons
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Learned Hand
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Quote:
So what's cheap, and what would you trade for?
make an offer/ what do you got?
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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What exactly is it that you have? Got pics and / or specs?
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: big bore pistons
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Quote:
What exactly is it that you have? Got pics and / or specs?
no pix on hand. but it is a standard wiseco 989 stroker kit. it has a pair of forged 10.5:1 pistons (2MM over bore for 865) with the wrist pin offset for a 6mm stroked crank. rings, pins, iron cylinder liners and gaskets.
mrt202 - I was thinking that you already have a BB, if so you would not need to mess with the liners, just the bottom end work.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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I forgot, but the stroker piston is the one on the left in the picture at the start of this thread. If you are really interested in them pm me.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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I was hoping it might be a complete kit like TPUSA sells. I would rather have everything on hand before splitting the cases. Like you,if i'm going that deep, i'd rather go all the way to a 1200. I hear there's a guy in Atlanta who will build you a 100+ HP motor with a year warranty for between 4-5 grand. I can do it myself, but if only i had that kind of spare change...
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: big bore pistons
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Quote:
I hear there's a guy in Atlanta who will build you a 100+ HP motor with a year warranty for between 4-5 grand. I can do it myself, but if only i had that kind of spare change...
Now we're talking Speedster! 
Wonder what the torque is like on such a beast.
2018 FLHCS
2014 Surly Straggler - 16,000 miles and counting!
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Re: big bore pistons
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Member
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Quote:
12:1 you are gonna probably need an octane additive. I don't think the pump gas is gonna cut it at that ratio.
I will tell you first hand that the 12.5:1 pistons are perfectly fine on 93 octane. I've had the kit on my '04 speedy for a little over 2 years now, and she is a monster in compairison to the 790cc stocker. If I get on her at around 4,000 she will bring the wheel off the ground! Have not once considered putting octane booster in with the gas, but I'm starting to wonder what will happen if I did.
04 Speedy, 904cc 12:1 CR JE pistons, ProCom CDI, Nology coils, Hotwires, lightened flywheel, CR ll's, 18 tooth front sprocket, freak kit, cocktail shaker and scypter exhaust, bobbed rear fender, headwinds headlight, wires in bars, and Scott Oiler
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Re: big bore pistons
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3/4 Throttle
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3/4 Throttle
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Quote:
Quote:
12:1 you are gonna probably need an octane additive. I don't think the pump gas is gonna cut it at that ratio.
I will tell you first hand that the 12.5:1 pistons are perfectly fine on 93 octane. I've had the kit on my '04 speedy for a little over 2 years now, and she is a monster in compairison to the 790cc stocker. If I get on her at around 4,000 she will bring the wheel off the ground! Have not once considered putting octane booster in with the gas, but I'm starting to wonder what will happen if I did.
So do you have a stroker kit installed or just 12.5:1 pistons with a 904 BB kit? I have a 904 kit installed but still looking for more.
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Re: big bore pistons
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Just the 12.5:1 pistons lightened flywheel and the heavy duty clutch. I know what you mean though, I'm also looking for more power too. I did talk to Dink at D&D and he suggested their cams first, then get the head ported and polished. Really wouldn't mind those cams... get the engine breathing a little easier. Also have the 36mm CR's on too.
04 Speedy, 904cc 12:1 CR JE pistons, ProCom CDI, Nology coils, Hotwires, lightened flywheel, CR ll's, 18 tooth front sprocket, freak kit, cocktail shaker and scypter exhaust, bobbed rear fender, headwinds headlight, wires in bars, and Scott Oiler
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Re: big bore pistons
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Fe Butt
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Fe Butt
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I thought the general consensus was that you couldn't really improve on the 790 cams. Or is that just on a stock or 904 engine?
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: big bore pistons
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There is a lot of $$ that goes into a stroker kit, if you have the coin I would say go for it, and I may farther down the road, but for now I'm going with what I can afford.
04 Speedy, 904cc 12:1 CR JE pistons, ProCom CDI, Nology coils, Hotwires, lightened flywheel, CR ll's, 18 tooth front sprocket, freak kit, cocktail shaker and scypter exhaust, bobbed rear fender, headwinds headlight, wires in bars, and Scott Oiler
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Re: big bore pistons
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Learned Hand
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OP
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Quote:
Quote:
12:1 you are gonna probably need an octane additive. I don't think the pump gas is gonna cut it at that ratio.
I will tell you first hand that the 12.5:1 pistons are perfectly fine on 93 octane. I've had the kit on my '04 speedy for a little over 2 years now, and she is a monster in compairison to the 790cc stocker. If I get on her at around 4,000 she will bring the wheel off the ground! Have not once considered putting octane booster in with the gas, but I'm starting to wonder what will happen if I did.
I like the sound of that (I was planning to just run premium gas in it) The bike is all back together and just setting there. The nice 2 inches of snow last night will prolong my wait to take her out.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: big bore pistons
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Loquacious
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the crank for the stroker is like 3 grand, and from what i heard triumph mixed and matched the bearings in there so unless you have a good machine shop of you yourself know what your doing i would have someone who knows about this do the install. bill at bp will do a complete rebuild for 500 bucks. just need to get the motor down to him
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: big bore pistons
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Quote:
I thought the general consensus was that you couldn't really improve on the 790 cams. Or is that just on a stock or 904 engine?
Dink was telling me that with the 904 upgrade, the cams that he has will aid the engine in breathing more effectively across the rpm range. He said that his flat tracker has the cams in there, along with major work done to the head (port and polish and hyabusa valves... about 2 grand worth of work) but I'm not sure if he is running the 270 crank or the 360. Have to get with about that. Kind of makes it a big issue at that point.
04 Speedy, 904cc 12:1 CR JE pistons, ProCom CDI, Nology coils, Hotwires, lightened flywheel, CR ll's, 18 tooth front sprocket, freak kit, cocktail shaker and scypter exhaust, bobbed rear fender, headwinds headlight, wires in bars, and Scott Oiler
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Re: big bore pistons
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Loquacious
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i think i am going to buy a set of cams from carlos at british customs. i still need to dial mine in but once i do i am going to get a set of his cams. he says they will pick up a solid 5-10 hp and same in TQ.
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: big bore pistons
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Learned Hand
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Quote:
the crank for the stroker is like 3 grand, and from what i heard triumph mixed and matched the bearings in there so unless you have a good machine shop of you yourself know what your doing i would have someone who knows about this do the install. bill at bp will do a complete rebuild for 500 bucks. just need to get the motor down to him
the crank for the stroker is between 1400 and 1600 USD depending on who you get it from. I don't know that triumph mixed and matched bearings so much as there are a range of bearing clearances that are available. Accurate measuring and bearing selection would be important especially after a crank shaft has been reworked.
The addition of the carrillo rods drives up the cost of the stroker. Bill Gately told me that the stock rod are okay for the stroker as long as you do not go over the 10.5:1 or add flat slides and a higher rev limit. I would add the carillos anyway.
If you do most of the work your self, you should be able to have a 989 for about $2K. a bit less if you already have a 904 and don't need the cylinder work.
I put plenty of reasearch into this before deciding to do just the 904 at this time.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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I haven't seen anybody discuss long-term reliability with the 998cc and above kits -- I've talked to a few Triumph mechanics (guys who work in the shops) and they say that while the 904 is basically as reliable (if not moreso) than the stock setup, the 998, 1100, etc are... questionable. And they were pretty un-impressed with the long-term reliability of the stroker kits.
So... anybody have a 998 that they've put 20k miles or more on it who can chime in? I've no doubt the power is AWESOME, but has the bike run ok?
--Jaeger
NEUTIQUAM ERRO
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