LS1inferno Posted April 30, 2008 Share Posted April 30, 2008 Who has a YZ 250 and what do you have it jetted at and what are your mods? We just got a 94 with FMF Gnarly and 185 PSI of compression, its got the big stock Mikuni (sp?) on it. Quote Link to comment Share on other sites More sharing options...
dunefreak Posted April 30, 2008 Share Posted April 30, 2008 I have a 94 YZ250 as well. I have the head slightly milled, Weisco piston, stock bore size, and I think I still have Boyensen (sp?) reeds- I cant remember. For Dumont I have mine jetted at 410 or 420. Ever since I ran that jetting I haven't had any top end issues. My bike came with a 330 and I burned up about 3 top ends before I realized how much fuel you need for duning with a 2 stroke. Quote Link to comment Share on other sites More sharing options...
britincali Posted April 30, 2008 Share Posted April 30, 2008 Those old YZs are haul a$$ motors, get it dialed in and there aint much that will keep up with it Quote Link to comment Share on other sites More sharing options...
LS1inferno Posted April 30, 2008 Author Share Posted April 30, 2008 I have a 94 YZ250 as well. I have the head slightly milled, Weisco piston, stock bore size, and I think I still have Boyensen (sp?) reeds- I cant remember. For Dumont I have mine jetted at 410 or 420. Ever since I ran that jetting I haven't had any top end issues. My bike came with a 330 and I burned up about 3 top ends before I realized how much fuel you need for duning with a 2 stroke. Wat piolt are you running and whats you needle position? How much compression are you pushing with the milled head? Quote Link to comment Share on other sites More sharing options...
dunefreak Posted May 1, 2008 Share Posted May 1, 2008 Wat piolt are you running and whats you needle position? How much compression are you pushing with the milled head? I can't remember what pilot jet or where the needle is. Sorry, its been a while since I have messed with it. I will know soon when I get ready for Coral Pink and jet it for that elevation. I'll let ya know. Right after I got the motor together it had 180 psi. I had to check it 3 times because I didn't expect it so high. It may be slightly less now after running it a few trips. It sure does run good as hell though. I heard 94's were teh best year YZ motors. I also heard even McGrath used a 94 head on his newer YZ. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.