Husky 250

[Vince Stokes]

I have a mate with an 02 WR250 and he is having plug fowling
problems.Only happens in dead tight single track,he has leaned the neddle by one knotch and it is still rich,anyone
have any recommended changes.He is a bit nervous going another knotch.

 

[sbohanon]

lean out the air screw and/or use a smaller pilot jet. at 800 feet elev., 70 degree F temp and 50:1 mix, my jetting is 27.5-30 pj, 1-1/2 as, 2nd groove from the top with 59? needle and 390-400 main. plug is perfect brown with little to no spooge.

 

[Vince Stokes]

Thanks for that,problem is he has gone down one to a 32 idle and the local shops have said not to go smaller or risk melting a piston.I will pass this on.

 

[bud]

I always found the 32.5 pilot to be right on my 02 and 04 and probably my 05. I have a 30 in my 05 now and that is too lean while the 35 is too rich. This is with the #3 slide, 60 needle on the 2nd top clip and a 370 main @ 40:1. This worked well enough everywhere I rode from sea level to 1000+ meters and from just below freezing to 30 degrees c. Dunno what that is in ye olde temp and altitude measurements :). Never fouled a plug with that jetting.

How long since it's had a top end? I think I remember needing leaner jetting when the top end was past its use by...

 

[Vince Stokes]

Its only done 1500k and is in Sydney so metrics ok.Its not going to kill it to try another knotch so
will try this first