Yamaha Starbike Forum banner

1 - 8 of 8 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter #1
Hi, first time poster and proud new owner/first time rider of a 2009 V-star 250! I would love to use this bike for a short commute on the interstate to my job and taking this thing over 60 mph is a bit rough on the engine of course. I keep seeing people post alot about replacing the sprockets and getting much better performance out of the bike and such and was wondering which sprockets would you guys suggest and what chain to accompany said sprockets would I need? Any help would be greatly appreciated and any other ways to make this thing a bit more highway friendly are too! Safe riding!
 

·
Registered
Joined
·
1,530 Posts
First off what are you wanting to do? Are you wanting to lower engine RPM at Highway speeds or performance stoplight to stoplight? To Lower our RPM you'll need a sprocket with fewer teeth at the rear, more at the engine or both. Don't know whats available, but by checking into your bike nomemclature you should be able to to know where you start. Doing just the front will probably involve less cost and you may be able to use your existing chain if still serviceable. If you figure the ratio of front sprocket to rear you can use this when you determine how much you want to lower your cruise RPM to buy the the correct sprocket or sprockets to get this reduction.
However now I offer a disclaimer. If you lower your cruise RPM your pick-up will suffer some. It's kind of a balancing act holeshot versus cruise. I say lower your cruise RPM, get a cam, a pipe, open up the intake and re-jet to get back that lost power.
 

·
Registered
Joined
·
9 Posts
Discussion Starter #3
Yes, I was wanting to lower the rpms at higher speeds. How much would it affect my start up acceleration because for now I've got more than enough to work with.
 

·
Registered
Joined
·
1,530 Posts
How high is the RPM at cruise? What would you like to bring it down to?
 

·
Registered
Joined
·
9 Posts
Discussion Starter #5
The v star 250 doesn't come with a tach but at 60mph its pretty high, but from the things ive read around these boards replacing the sprockets will turn my 60mph 5th gear rpms to basically my 60mph 4th gear rpms
 

·
Registered
Joined
·
1,530 Posts

·
Registered
Joined
·
1,530 Posts
Depends on where it is adjusted now, but if you do both sprockets and your chain is serviceable then probably not. From what I saw on that page you were going up 1 or 2 on the front and down by as many as 7 in the rear, sounds like you might need a chain breaker to shorten it (take a link out). By all means try it first.
 
1 - 8 of 8 Posts
Top