Forums
New posts
Search forums
Members
Current visitors
New profile posts
Search profile posts
What's new
New posts
New profile posts
Latest activity
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Everything Dirt Bike
General Dirt Bike
Yz 125 trail bike
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="ossagp" data-source="post: 171345" data-attributes="member: 1650"><p>For my yamahas one tooth smaller on the sprocket affects the drag too much. I go up on both ends sizewise. getting one larger than a 53 usually results in ordering from Sprocket Specialties though. I use a 14 and a 56 for some riding and that requires that the chain guide be modified.</p><p></p><p>In the end, if you stick with the 5 speed you are going to be 'wanting' for a lot. </p><p></p><p>The over bored 125's I have make pretty good trail bikes. I have one that is a lot like a fast, light KDX with closer ratio gears as far as the engine goes. (It is a yamaha with a 144 kit that started life as an athena 125). </p><p></p><p>As far as going up or down on the cylinder height, the larger bikes can go "up" a little and live ok with the more advanced and longer port timing easier than the 125's can. My trail ridden 144 is quite a bit retarded in the port timing from stock. Going to a thicker base gasket does just the opposite. I would try thinner if you are going to try a different gasket thickness.</p><p></p><p>I would be looking hard for a 6 speed gear set above anything you listed as prospective or already done. It will really add to the versatility of a 125. track only you can easily live with and can probably even prefer the 5 speed.</p></blockquote><p></p>
[QUOTE="ossagp, post: 171345, member: 1650"] For my yamahas one tooth smaller on the sprocket affects the drag too much. I go up on both ends sizewise. getting one larger than a 53 usually results in ordering from Sprocket Specialties though. I use a 14 and a 56 for some riding and that requires that the chain guide be modified. In the end, if you stick with the 5 speed you are going to be 'wanting' for a lot. The over bored 125's I have make pretty good trail bikes. I have one that is a lot like a fast, light KDX with closer ratio gears as far as the engine goes. (It is a yamaha with a 144 kit that started life as an athena 125). As far as going up or down on the cylinder height, the larger bikes can go "up" a little and live ok with the more advanced and longer port timing easier than the 125's can. My trail ridden 144 is quite a bit retarded in the port timing from stock. Going to a thicker base gasket does just the opposite. I would try thinner if you are going to try a different gasket thickness. I would be looking hard for a 6 speed gear set above anything you listed as prospective or already done. It will really add to the versatility of a 125. track only you can easily live with and can probably even prefer the 5 speed. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Everything Dirt Bike
General Dirt Bike
Yz 125 trail bike
Top