OzVMX Forum

Marque Remarks => Yamaha => Topic started by: odd1 on August 15, 2011, 05:26:01 pm

Title: YZ 250 1983
Post by: odd1 on August 15, 2011, 05:26:01 pm

Could anybody tell me what the standard mainjet and pilot jet are for this model?

Title: Re: YZ 250 1983
Post by: GT43 on August 19, 2011, 06:26:24 pm

Looks like Yamaha list the "L"  the same as the "K" .

Pilot jet = 60
Main jet = 290

An old magazine tells me the Yanks liked to run a 280 main with holes cut in the airbox.

Stock standard they reckon the 250K lacked a little bottom end power, and the 250L had to much.
My first 250 was an L, and it would pull like a 500 from idle, then fall in a hole at the top end.

Good luck with the jetting.