Question about Yamaha YZ 125 Motorcycles

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Is it possible to de-restrict a yamaha wr 125 or is it on its maximum power because its a 4stroke?

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Yes Tim. A lot of Yamahas' are restricted somewhere. They generally place restrictors in one or two of several possable places so I'll list them.
In the airbox-in the air intake as well as behind the air filter.(not common)

In the inlet manifold-in front of the carby-more common.

In the exhaust at the header(where the exhaust bolts to the cylinder head)-in the form of a washer restricting the flow.-very common

In the muffler- in the outlet-sometimes internal.

If your bikes exhaust note is extremely quiet then I'd start at the muffler!!

Also note that you'll need to check your jetting afterwards but don't be alarmed- if it runs better all & good
If it causes a miss or hesitation go up a size in the main jet is all that is usually required

Hope this helps
Regards Andrew

Posted on Jul 15, 2010

  • ad brown
    ad brown Dec 15, 2013

    hi these new wr125's are pretty much same as the dt125

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