Rear Wheel Sprocket Reduction - Yamaha FZ6 Forums - FZ6 Motorcycle Forum
 
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post #1 of 5 (permalink) Old 05-13-2009, 05:14 PM Thread Starter
 
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Rear Wheel Sprocket Reduction

I would like to change from the standard 46 tooth rear wheel sprocket to a 36 tooth rear sprocket. The standard gear ratio is 46/16 or 2.88.(assuming a 16 tooth engine sprocket). The new sprocket change would be 36/16 or 2.25. This would provide a 21% reduction in engine speed.. On the highway at 6000rpm in sixth gear 72mph is achieved with stock gearing. With the sprocket change the engine would be turning at 4800 rpm at the same road speed. Would the engine be able to pull this very tall gear ratio?. ( Can the Yamaha FZ6 operate safely at 72mph with the engine running at only 4,800 rpm in sixth gear?) Any help from riders who have changed engine and/or rear wheel sprocket sizes would be greatly appreciated!
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post #2 of 5 (permalink) Old 10-20-2009, 01:40 AM
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It ain't a Harley. It won't be able to pull a greased string out of a cats ass with the spocket you are talking about. It only has 44lbs of torque. The yamaha engineers know more than you do. Ride it and get used to the revs. The engine is indistructable.
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post #3 of 5 (permalink) Old 11-26-2009, 04:13 AM
 
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Sprocket Ratio Change:

Quote:
Originally Posted by soemd View Post
I would like to change from the standard 46 tooth rear wheel sprocket to a 36 tooth rear sprocket. The standard gear ratio is 46/16 or 2.88.(assuming a 16 tooth engine sprocket). The new sprocket change would be 36/16 or 2.25. This would provide a 21% reduction in engine speed.. On the highway at 6000rpm in sixth gear 72mph is achieved with stock gearing. With the sprocket change the engine would be turning at 4800 rpm at the same road speed. Would the engine be able to pull this very tall gear ratio?. ( Can the Yamaha FZ6 operate safely at 72mph with the engine running at only 4,800 rpm in sixth gear?) Any help from riders who have changed engine and/or rear wheel sprocket sizes would be greatly appreciated!
I have to agree with scottfarm, that's a really radical change!
The factory pretty well has it all together. If you did this and then shortened your chain accordingly, I think that you would be shifting all of the time and I honestly think you may lose top end. JMO

Last edited by deeptekkie; 11-26-2009 at 04:14 AM. Reason: Spelling
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post #4 of 5 (permalink) Old 11-26-2009, 09:56 AM
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It would be just the opposite. It would be geared to high. He could just keep it in 1st gear all the time.
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post #5 of 5 (permalink) Old 11-26-2009, 04:32 PM
 
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Sprokets:

I used to have Suzuki dirt bike that was geared so low it would pull tree stumps.You never had to change gears if you didn't want to, (but of course it had NO top end at all). By the same token, I've had two cars that were geared too tall, to keep the revs down and improve the fuel efficency, (both automatics), and they shifted, changed gears, and locked and unlocked the torque coverters, all of the time. He could chug along without changing gears but the thing will be lugging all of the time. I sincerely believe that he will lose a lot of top end as well, (if that is even a factor to him).
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