Bonneville America Forums Forums Technical Forums Performance Mods Big Bore Tomorrow

Well, this is exciting! Member Hasse and I have this project doing our Wiseco 904 Big Bore together. A couple of weeks ago we teared down our engines and shipped the barrels to Jojje (the turbo guy you all know) for boring, sleeving and honing. Today Hasse picked up the barrels from the post office and we'll meet tomorrow to get it all together. Doing two is twice as fun!

The feeling right now is somewhat like when you were a kid waiting for Santa. Of course we will leave a full report here! Keep your fingers crossed!

Good luck, take your time, and have fun!

Bengt, further to our discussion in Sweden last year, after the bore, watch how the tone of your exhausts changes.

Good Luck!


Johann

One of these days......

The wife just bought a Brenina sewing machine. I've just built up my credit rating again... 904 or 988

Good luck also and keep us posted.

My BB kit was installed almost a year ago. Still seems like a new bike. Totally happy with the power and torque. Have fun!

You guys are bad influences. Why is it that I don't NEED the big bore kit I just WANT it? My bike has enough power as it is for my type of riding. Is it just in men's DNA that bigger is better? Oh, the expenditures!

But I digress, let us know how it turns out.

Ramsound,

Did you have the SS long slash cuts before the BB kit? If so, are they louder now? I just added the SS longs last month -just curious.

take your time putting it together. trust me it will make your life easier. you could not have a better guy do the machine work also. goodluck and report back when finished.

Frank

get some sheet eating grin removal cream, you are going to need it.

Short report from the Swedish Big Bore Project - Hasses bike is now a 904 and tomorrow we continue with Pipers bike! More details later.
Regards
Hasse

Oh yeah! Have a look at my sig... Engine's done. now to mount all the surrounding bits and pieces to complete the build. Stay tuned...

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get some sheet eating grin removal cream, you are going to need it.

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Please tell me where to find that cream. Got it all together and it fired up immediately! What a rush! Unfortunately it has started to snow here, so the first ride will have to wait. But - IT'S ALIVE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Today my bike is alive also!

For this project me and Piper has followed 'Dinquas Big Bore instuctions' closely. A big thank to Pat for his great work with the these instuctions. In the same spirit we would like to contribute our experiance during this project.

At two points during the re-Installation we slightly changed the procedure. First place was when we got to the 'Re-Installation of Pistons'. This alternative method was suggested by Piper and applied with success on both our bikes. Prepare the pistons according to Pats instruction. But instead of fitting them to the rods turn the cylinders upside down and mounted both pistons into the sleeves. Be careful to get the arrow in the right direction. Then turn the cylinders around and carefully slide it down on the engine bolts. Align the first rod with the piston hole and insert the gudgeon pin and secure it with the circlip, and then the same procedure for the second piston. And let the cylinders continue down in correct position

The second place where we turned into an alternative way was regarding the Re-Installation of Cam Chain, Sprocket and Tensioner. This is how we did it. Easy method if you are two persons. Follow Pats instruction exactly up until you have the the Cam Chain nice and tight in the correct postion on the Sprocket. Now instead of installing the Drive Gear Shaft through the Sprocket let Person 1 hold the Sprocket with the Cam Chain in a tight and correct position while Person 2 inserts and secure the forward (Exhaust) Cam Tensioner Blade followed by the rear (Inlet) Cam Tensioner Blade. After both Cam Tensioner Blades are in place insert the Drive Gear Shaft with the washers and Retaing bolts according to Pats procedure. And check that all the timing marks still are in the correct position.

So, now we are just waiting for somewhat warmer weather for the burn-in procedure. Also a thank to Jojje for all his work with re-sleeving our cylinders.
Hasse

Are there any performance kits for the 07's or are those motors pushed as far as they can go?

good job on the install. you will love your "new" bike. and you can put this kit on a 07 and have just as much fun

Frank

+3°C = 37°F. First hard ride á la Motoman done. Did around 20 miles in 2nd, 3rd and 4th gear up to 6000 rpm and motorbraking. Did this over and over again. And yes, like you who have done this already said - it's crazy. Tons more torque and a deeper, nicer sound from the T-bikes. Now I have changed the oil and filter and the next ride will have to wait until the temp goes up a couple of degrees. The barnett clutch springs did their job, and there was no slipping at all.
I'm one happy camper right now, and I think I've earned a large whiskey and a couple of
Then I think I'll just go out into the shed and sit there and look at the beast.

Did you replace the clutch plates also or just the springs? When I did my 904 the springs worked good for a while, about 5-6 thousand miles, but now I get slippage in all my gears, even 5th on the highway sometimes. So a new clutch is in the plans for me soon.

you need the green springs, gold ones stink

Frank

for the 100 bucks, I'll just upgrade the whole thing

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Did you replace the clutch plates also or just the springs?

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Just the springs. Hasse is probably doing the whole clutch.

Me want too!

...... next year mabye?!

At least i know now who is going to help me out while doing it!?

Johann

Of course we'll help you! It really is better to be more than one when doing this, and as I said earlier - twice as fun!

thats why i did mine. i like the feel of the barnett better also. just make sure you get the green springs

Frank

The Grin is on!
+8°C = 46°F, rain, wet and misty and I just returned from my first 25 miles of break-in procedures and everything seams to be just like everybody before me has reported - WOW!!. It will be a long wait now until springtime that is for sure.
Hasse

Yeah, it's kinda hard to explain how different the 904 is. Big change more like a whole different engine. I love the torque.

The best part is that I can accelerate just as fast 2-up loaded with gear as I used to be able to do solo before the 904

Ditto, I did the BB because I ride 2-up a lot. It seems to be just as strong 2-up as solo now.

there is one drawback to the 904. or at least for me it now makes me crave even more

Frank

your prob right but i have a feeling the 11 or 1200 would make me very happy for awhile

Frank

I'd glad to say I have my power addiction under control. Like a lot of people on this forum, I was happy with mods on the 790 performance. My bike came with a 17T front sprocket which made it quick off the line but I was always looking for 6th. I changed to a 18T the first year which eliminated my cruising and gearing complaint, but I craved more power starting off - especially 2-up.

I did the BB almost a year ago and over the last year have tweaked it near it's potential. I love the bike more than when I bought it and more than any I can presently see in any showroom. It's giving me everything I hoped for with the BB and I can keep my craving under control. I doubt I'll be drooling over a T-bird or risking any problems or reliability issues with more engine work.

I just worry about what would I would do if I lost my bike. I like the laced wheels, enjoy tweaking the carbs, don't mind adjusting the chain, and really LOVE the classic Triumph look on a cruising bike.

i hear ya. there are really no bikes out there that make me want a new bike. but i dont know if i will ever get my power addiction under control. good thing is by the time i can afford a bigger bore kit there will be enough people who have had them for awhile and i can see how reliable they are

Frank

Congratulation Bengt (and Hasse also). It seems to me that you are well prepared now for next year TBA Rally "Road to Hel" and there's no devil to stop you. No more "Rent a car" Rallys.