Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
Members
Registered members
Current visitors
New profile posts
Search profile posts
Donations
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
Aftermarket Engine/Parts
Lifan
Ideal exhaust size for lifan 125cc
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="69ST" data-source="post: 142509" data-attributes="member: 5"><p>A properly setup L125 should be good for a top speed close to 60mph, with high 50s being pretty typical. For that, gearing, carburetion and exhaust need to be optimal. Your home made pipe is obviously a lot less restrictive than the inexpensive feebay knockoff of the stocker. Those feebay cheapies are pretty restrictive even compared to the OEM exhaust; they're designed to meet strict noise limits - when fitted to 49cc-powered bikes. Exhaust tuning can get pretty involved. I'll spare you the longwinded tech dissertation. Your exhaust port ID is probably close to 25mm. Your cheapie muffler outlet ID is closer to 15mm, far smaller than OEM stock. You're asking the motor to exhale through a soda straw, IOW...a HUGE flow restriction.</p><p></p><p>Changes in exhaust flow can affect air:fuel ratios, so be aware. This can negatively affect top speed, throttle response and peak engine temp. A bit of carb tweaking may be needed, following an exhaust swap, to realize optimal results.</p></blockquote><p></p>
[QUOTE="69ST, post: 142509, member: 5"] A properly setup L125 should be good for a top speed close to 60mph, with high 50s being pretty typical. For that, gearing, carburetion and exhaust need to be optimal. Your home made pipe is obviously a lot less restrictive than the inexpensive feebay knockoff of the stocker. Those feebay cheapies are pretty restrictive even compared to the OEM exhaust; they're designed to meet strict noise limits - when fitted to 49cc-powered bikes. Exhaust tuning can get pretty involved. I'll spare you the longwinded tech dissertation. Your exhaust port ID is probably close to 25mm. Your cheapie muffler outlet ID is closer to 15mm, far smaller than OEM stock. You're asking the motor to exhale through a soda straw, IOW...a HUGE flow restriction. Changes in exhaust flow can affect air:fuel ratios, so be aware. This can negatively affect top speed, throttle response and peak engine temp. A bit of carb tweaking may be needed, following an exhaust swap, to realize optimal results. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Aftermarket Engine/Parts
Lifan
Ideal exhaust size for lifan 125cc
Top