better mpg with 17T front sprocket?? - Honda Motorcycles - FireBlades.org
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post #1 of 9 Old 06-18-2008, 11:21 AM Thread Starter
 
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better mpg with 17T front sprocket??

I have a 520 conversion (15/43) fitted on my 954 and have been averaging 43-46mpg. Its doing almost exactly 6000rpm at 80mph. I would like to go to a 17T front sprocket which would lower my rpm's by almost 12%. Anyone tried this? Will it fit?? Will it make the bike lose too much punch??
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post #2 of 9 Old 07-25-2008, 11:43 PM
 
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Re: better mpg with 17T front sprocket??

Factories generally gear the bike for maximum fuel economy and emissions, and if you're getting 45 mpg from a near-liter bike, you're doing awesome. My Ducati gets 35 tops, and most big bikes get low 40s at best if you ride like a gramma.
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post #3 of 9 Old 07-26-2008, 1:16 AM
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Re: better mpg with 17T front sprocket??

Manufacturers usually gear sportsbikes to pull top gear to about 5-10% short of _actual_ redline (not the redline shown on the tacho) to allow for tail winds and drafting although sometimes they over-gear wildely to keep the revs down for noise testing - SRAD GSXR's for example.
Lowering the gearing also lowers the mileage on your odometer so you have to calculate your economy with that in mind.
44mpgUS is around 18kpl I think which is pretty good for around town and 30% better than my 929.
For the cost of a front sprocket just try it. If you don't like it you don't have to keep it.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #4 of 9 Old 07-26-2008, 11:08 AM
 
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Re: better mpg with 17T front sprocket??

I live in Seattle, Washington so I mostly ride in the city, but I've noticed if I go on any longer rides my mpg increases drastically. Usually in the city I get a pretty consistant 35 mpg. But on a 300 mile round trip vacation I recently took I was getting 47 mpg on the highway. Oh and I also have a 520 conversion.
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post #5 of 9 Old 08-03-2008, 2:42 AM Thread Starter
 
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Re: better mpg with 17T front sprocket??

Got the 17T and have had it on for a week or two. I like the 80mph 5200rpm cruise!! Haven't ran enough to assess gas mileage just yet either. Fit was no issue, plenty of clearance. Off the line it is a little less punchy, but still pulls like an RR should, even 2 up. Will report back on mpg...
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post #6 of 9 Old 08-13-2008, 1:51 AM Thread Starter
 
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Re: better mpg with 17T front sprocket??

OK two tanks on it. 50mpg average!! Can't complain. Cruising at 75-80 for 80% of the mileage and the rest on surface streets. Even took a '08 GT500 Shelby out during a friendly neighborhood green light race! (so its not gutless!)
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post #7 of 9 Old 08-15-2008, 1:06 PM
 
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Re: better mpg with 17T front sprocket??

Quote:
Originally Posted by gear_head View Post
still pulls like an RR should, even 2 up. ...

17 teeth is only 1 tooth up... Stock is 16/43 teeth.
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post #8 of 9 Old 08-15-2008, 2:17 PM
 
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Re: better mpg with 17T front sprocket??

I do the 17T on the highway state to state and i like it. I does lose punch but hell, who really needs as much as these bikes put out really? I love the punch but i really dont need it. I can stay outta trouble without it.
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post #9 of 9 Old 08-19-2008, 8:48 AM
 
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Re: better mpg with 17T front sprocket??

You'll get even more mpg if you turn your engine off and push your bike-but whats the point of that ??? Surely you dont buy a blade and then start worrying about mpg,after all you knew what is was like before you bought it..
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