 MPG after rejetting?
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Joined: Jun 2008
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OP
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Hey gang,
My '08 America was rejetted earlier this year. I've lost considerable gas mileage.
Stock I was getting 40 - 42 mpg
After rejet and installation of short TORS, I'm getting ~35.
Running too rich? What was your experience?
Don't ask me tech specs, I'm not a mechanic, the work was done at the dealership.
Thanks
Joe
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Re: MPG after rejetting?
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Joined: Feb 2007
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Fe Butt
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Fe Butt
Joined: Feb 2007
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well running bigger jets and less restriction you are bound to lose some mileage. That sounds like a big drop for just TORs though. The new jet shouldn't be that much bigger than stock. I'm assuming you still have your air box. Might be rich unless you were that lean before the adjustments, that is also possible. If you were lean to start then you have to account for more gas to correct that, then add TORs and new jets and more gas to set that up correctly then that drop might not be out of line.
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: MPG after rejetting?
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Joined: Jul 2007
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I have 128 mains and 45 pilots, short tors and a uni filter.. I get about 48 mpg and trust me, I ride her hard YEeeeeeeeeHaaaaaaaaaa
TrOjAn
TrOjAn
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Re: MPG after rejetting?
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Joined: Apr 2007
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Loquacious
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Loquacious
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I would pull your plugs and note the colour. If they are black, then the jets are too rich. Tan coloured is just right. Was the snorkel pulled from the air box? If not, pull it and note any improvement in performance.
How many miles on your bike? The mileage should get better when the bike is broken in.
Do you know what size of jets were installed by your dealer?
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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 Re: MPG after rejetting?
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Joined: Jun 2006
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Loquacious
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Loquacious
Joined: Jun 2006
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One other possibility. More Power. More Fun. Use More Power often. Use more gas. 
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."
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Re: MPG after rejetting?
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Joined: Feb 2005
Posts: 988
3/4 Throttle
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3/4 Throttle
Joined: Feb 2005
Posts: 988 |
Quote:
I have 128 mains and 45 pilots, short tors and a uni filter.. I get about 48 mpg and trust me, I ride her hard YEeeeeeeeeHaaaaaaaaaa
TrOjAn
I couldn't get that fuel mileage if I was going downhill with a good tail wind. I am lucky to get 35mpg when taking it easy and when I am running her hard it will drop down below 30mpg. I have to switch to reserve at times at or around the 90 mile mark.
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Re: MPG after rejetting?
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Joined: Aug 2007
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Should be Riding
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Should be Riding
Joined: Aug 2007
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Quote:
I couldn't get that fuel mileage if I was going downhill with a good tail wind. I am lucky to get 35mpg when taking it easy and when I am running her hard it will drop down below 30mpg. I have to switch to reserve at times at or around the 90 mile mark.
thats horrible mileage, you must have a leak somewhere.
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: MPG after rejetting?
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Joined: Jun 2008
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Trojan - 48 MPG is impressive. Unbelievable, but impressive.
Gregger - ~5,000 miles on the bike, so way beyond broken in. Dunno about size of jets.
Brian: Your theory is definitely plausible, but a 20% drop in mileage still seems excessive.
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Re: MPG after rejetting?
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Joined: Jan 2005
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Learned Hand
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Learned Hand
Joined: Jan 2005
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Short TORs, part of snorkel that is inside the airbox cut off, 125 mains, pilots 2 turns out dont know the milage but I get 135 miles before reserve.
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Re: MPG after rejetting?
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Joined: Jul 2007
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Member
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Member
Joined: Jul 2007
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I'm pretty sure trojan is talking imp. gallons, which are 20%bigger than us. gallons,so 48mpg works out to about 40 mpg.
Last edited by devo; 04/11/2009 4:47 PM.
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Re: MPG after rejetting?
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Joined: Jan 2005
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Check Pants
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Check Pants
Joined: Jan 2005
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I was getting 43-44 mpg with stock jets. Two rejets later, I'm consistently hitting 40-41 mpg. So the upsize jets hurt mileage a little.
Al
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Gentlemen I stand Corrected!
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Just sat down and did the maths.. I apologise for my earlier claim to 48 MPG it is in fact 43 MPG, it was higher before the jetting.
Once again, sorry for my misleading info..
TrOjAn
TrOjAn
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Re: Gentlemen I stand Corrected!
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Joined: Feb 2007
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Fe Butt
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Fe Butt
Joined: Feb 2007
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Is that Imperial gallons?
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: MPG after rejetting?
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Joined: Apr 2008
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Loquacious
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Loquacious
Joined: Apr 2008
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With my new hydrogen system installed, I now get 78 - 84 mpg, depending on how hard I ride. 
And you may see me tonight
With an illegal smile
J. Prine
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Re: Gentlemen I stand Corrected!
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Joined: Jul 2008
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Learned Hand
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Learned Hand
Joined: Jul 2008
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My bike did 47/48 MPG originally. I'm not sure exactly how much I lost by rejetting, cuz I added a windshield and large lowers at around the same time. When I did that, my mileage dropped to 37/38. I recently changed out the lowers for a pair about the size of those sold by Memphis Shades, and I'm now seeing 43/44 MPG. Based on all this, I don't think the jets/pipes really made much difference.
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
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Re: Gentlemen I stand Corrected!
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Joined: Jan 2005
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Adjunct
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With D&D pipes and a jet kit, I get right at 40 MPG to and from work which is 14 miles away. On a longer trip like 500 miles running 75 mph, I get 47 mpg. I am pleased with this plus the performance is just right.
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Re: MPG after rejetting?
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Joined: Aug 2007
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Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,728 Likes: 5 |
Quote:
With my new hydrogen system installed, I now get 78 - 84 mpg, depending on how hard I ride.
Do you have that running to a flux capacitor?
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: MPG after rejetting?
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Joined: Feb 2007
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Fe Butt
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Fe Butt
Joined: Feb 2007
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I don't think so, I think he has the Omega 13.
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: MPG after rejetting?
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Joined: Aug 2007
Posts: 10,728 Likes: 5
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,728 Likes: 5 |
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: MPG after rejetting?
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Joined: Aug 2005
Posts: 2,726
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,726 |
My bike runs great and I quit worrying about the mileage. I get 35-40 depending if it's worst case around town or all on the highway. At stock I got almost 5 mpg more, but I'd never go back to that.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: MPG after rejetting?
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Joined: Feb 2008
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Loquacious
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Loquacious
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35 MPG in mixed riding conditions (including twisting the throttle) is on the low side of the normal range for a piped & jetted bike; I consider high 30's as average & low 40's as great. YMMV 
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Re: MPG after rejetting?
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Joined: Jul 2007
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Adjunct
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Yea.. lets not worry about fuel and all go for a ride.. yahoooooo brmm brmm beep beep get out the way!!
Southend Shakedown tomorrow, 1000`s of bikes on the seafront and I bet none of them will be worried about the MPG
TrOjAn
TrOjAn
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Re: MPG after rejetting?
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Joined: May 2006
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Loquacious
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Loquacious
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The folks who seem to know these bikes in and out (and I don't mean me) generally agree that stock is a very lean setting, spec'd to accomplish world market pollution ideals. Direct evidence of this is the fact that the outer pipes that cover the header pipes turn blue.  Although lean does yield some great MPG numbers, one has to wonder about the long term effects of running as hot as the engine can produce with regard to a street usable fuel air mix.
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Re: MPG after rejetting?
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Joined: Jul 2007
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Adjunct
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Quote:
Although lean does yield some great MPG numbers, one has to wonder about the long term effects of running as hot as the engine can produce with regard to a street usable fuel air mix.
Now aint that the truth... running hyper hot has got to damage the engine, who knows what it does to the life of the engine? maybe knocks several thousand miles off the life? Just as well US tweakers know the secret to COOL running 
Happiness is a BIG jet LOL
TrOjAn
TrOjAn
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Re: MPG after rejetting?
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Joined: Sep 2007
Posts: 1,668
Learned Hand
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Learned Hand
Joined: Sep 2007
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My bike is fairly heavily modded, and with 150/42 jetting, i can get from 38mpg (riding it like i borrowed it) to 49mpg if i keep it under 65 mph.
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: MPG after rejetting?
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Joined: Jan 2005
Posts: 5,537
Check Pants
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Check Pants
Joined: Jan 2005
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Quote:
With my new hydrogen system installed, I now get 78 - 84 mpg, depending on how hard I ride.
Sure smart guy, that's working for you now. But wait until your Dilithium Crystals run out.
Al
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Re: MPG after rejetting?
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Joined: Jun 2006
Posts: 2,626
Loquacious
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Loquacious
Joined: Jun 2006
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That's not an unusual mpg number. I usually get mid-30's. It's how you ride. I don't mean speed, I've gotten to 90mph on only half-throttle, took a while, though. It's acceleration. If you hit 6000 rpm 3 times on the way to 60mph, you get mid-30's mpg. Fun, though. 
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."
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Re: MPG after rejetting? *DELETED*
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Joined: Jun 2006
Posts: 2,626
Loquacious
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Loquacious
Joined: Jun 2006
Posts: 2,626 |
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."
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Re: MPG after rejetting?
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Joined: Sep 2007
Posts: 1,668
Learned Hand
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Learned Hand
Joined: Sep 2007
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Quote:
It's not an unreasonable mpg number.
I normally get mid-30's. It's all on how you ride.
I don't mean speed, I've done 90mph on half-throttle,
took a while, though. It's acceleration.
If you hit 6000rpm 3 times on the way to 60mph, you get mid-30's.
Fun, though.
I agree, but it really didn't bear repeating. 
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: MPG after rejetting?
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Joined: Jul 2007
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Adjunct
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Adjunct
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Quote:
My bike is fairly heavily modded, and with 150/42 jetting, i can get from 38mpg (riding it like i borrowed it) to 49mpg if i keep it under 65 mph.
EEek quick hijack here.. what air filter are you using with those 150`s?
TrOjAn
TrOjAn
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Re: MPG after rejetting?
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Joined: Jul 2008
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Learned Hand
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Learned Hand
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Quote:
what air filter are you using with those 150`s?
Now you're just being presumptuous. 
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
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Re: MPG after rejetting?
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Joined: Sep 2007
Posts: 1,668
Learned Hand
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Learned Hand
Joined: Sep 2007
Posts: 1,668 |
Quote:
Quote:
My bike is fairly heavily modded, and with 150/42 jetting, i can get from 38mpg (riding it like i borrowed it) to 49mpg if i keep it under 65 mph.
EEek quick hijack here.. what air filter are you using with those 150`s?
TrOjAn
Uni filter, gutted and drilled airbox.
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: MPG after rejetting?
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Joined: Apr 2008
Posts: 3,937
Loquacious
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Loquacious
Joined: Apr 2008
Posts: 3,937 |
Quote:
Quote:
With my new hydrogen system installed, I now get 78 - 84 mpg, depending on how hard I ride.
Sure smart guy, that's working for you now. But wait until your Dilithium Crystals run out.
Omega 13 ?
Flux Capacitor ?
Dilithium Crystals ?
Let me get this Patent crap out of the way, and then I'll post pic's on PhotoPost! 
And you may see me tonight
With an illegal smile
J. Prine
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Re: MPG after rejetting?
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Joined: Feb 2007
Posts: 23,217 Likes: 61
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,217 Likes: 61 |
Omega 13 - Galaxy Quest
Flux Capacitor - Back to the Future
Dilithium Crystals - Star Trek
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: MPG after rejetting?
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Joined: Jan 2005
Posts: 5,172
Saddle Sore
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Saddle Sore
Joined: Jan 2005
Posts: 5,172 |
That mileage sounds way too low to me...
I've got an 03 TA, 790 motor, Thunderbike silencers, all snorkels removed, Jenk's screened bellmouth intake on a stock air filter, with 135 mains and 45 pilots, and I get 45mpg consistently in the rolling hills of SW Pa. On a trip I get 50mpg and before any mods were done the thing would get 60mpg.
Maybe comparing an 03 to an 08 is apples and oranges, but your mileage still sounds way too low. Check your plugs. If they're covered in black soot it's time to regroup.
More flags
More fun!
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Re: MPG after rejetting?
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Joined: Jan 2008
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Learned Hand
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Learned Hand
Joined: Jan 2008
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now that I am (finally) getting my BB broken in with some descent length rides. At this time I feel the jetting is pretty close, 142.5/45. 3 tanks of gas so far with this arrangement, mixed riding speeds, and 47 mpg each time. THis is better than before the BB work. I would be 43 to 45 tops on the highway with the cruise control.
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: MPG after rejetting?
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Joined: Mar 2007
Posts: 5,616
Check Pants
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Check Pants
Joined: Mar 2007
Posts: 5,616 |
Quote:
Quote:
Quote:
With my new hydrogen system installed, I now get 78 - 84 mpg, depending on how hard I ride.
Sure smart guy, that's working for you now. But wait until your Dilithium Crystals run out.
Omega 13 ?
Flux Capacitor ?
Dilithium Crystals ?
Let me get this Patent crap out of the way, and then I'll post pic's on PhotoPost!
Its already been done...
Bikebooster 1
Thundernutz 1
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
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Re: MPG after rejetting?
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Joined: Apr 2008
Posts: 3,937
Loquacious
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Loquacious
Joined: Apr 2008
Posts: 3,937 |
Quote:
Quote:
Quote:
Quote:
With my new hydrogen system installed, I now get 78 - 84 mpg, depending on how hard I ride.
Sure smart guy, that's working for you now. But wait until your Dilithium Crystals run out.
Omega 13 ?
Flux Capacitor ?
Dilithium Crystals ?
Let me get this Patent crap out of the way, and then I'll post pic's on PhotoPost!
Its already been done...
Bikebooster 1
Thundernutz 1
But NOT done to MY standards! 
My system uses two seperate units, each the size of a small, 6 ounce concentrated juice container, no water(uses humitity from incoming air),and output is double for each unit (4 x total) 
Not sold in stores.
And you may see me tonight
With an illegal smile
J. Prine
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