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Discussion Starter #1
I have a 2010 250 Star. Want to install new sprockets and chain. What is recommended for best mileage? Also, how many teeth? OEM, or better suggestions. Links on chain? Thanks in advance.
 

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Thanks! EXACTLY the info I was looking for. I'm having a little trouble with the forum site, but think I'm on the right track using the temporary password.
Yes very much interested in your chain and sprockets, need more information. PM me please.
 

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I think the guy on the website is confused.

Normally when talking faster/slower, they mean acceleration, and your speed from a stop is slower when you lower the rear sprocket, but you get a higher top end (and normally better gas milage if you keep your rpm's lower at the same speeds).

But since your now using more hp than before you have less reserve for things like wind as he noticed (aka wasted gas). Only solution you wil have is to downshift, if it is a problem.

https://www.gearingcommander.com/
select yamaha, xv, 250 88-09
It uses all the same gearing except comes with a 45 rear instead of 42rear, I have no idea about chain though, as the 2010 manual doesn't spec the chain at all.

I would likely if I was doing it, go with 16/38 max, 17/38 is likely too much. and it means you won't have to replace that sprocket also, the front ones can be a real pain to get off.
Also check what is currently on the bike, not sure if you got the bike used, someone might have made changes already.
 

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Thanks, that all makes sense. I did install a 17 tooth front sprocket. Seems to be geared fine. But picked up a little vibr as tion that wasn't there before. The bike only has 1100 miles on it now. Bought it with only 90 miles! Had to pull the carb and clean it out, but now runs perfect.
I think I'll put the OEM 16 tooth back on, and go with 38 rear. May take a few combinations before I'm totally satisfied.
 
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