125-200cc 2009 WR125 issues.

[Dirtdame]

I have a suspicion that these bikes have a lean spot in the mid range and the constant half throttle running aggravates the situation until a seizure occurs.

I used to see that condition back in the 80s when I did desert enduros. The course would be running down a long stretch of deep sand and whoops that demanded full throttle, then when the bikes were good and hot and the riders would get the opportunity to roll off a bit, the bikes that were jetted too lean at midrange would lock up.

 

[ajaxauto]

I used to see that condition back in the 80s when I did desert enduros. The course would be running down a long stretch of deep sand and whoops that demanded full throttle, then when the bikes were good and hot and the riders would get the opportunity to roll off a bit, the bikes that were jetted too lean at midrange would lock up.

NEVER LIFT if you want to slow down hit the kill button once you learn
how to do it you will never lift .Works really good on down hills
just leave it in gear and push the button then when you are almost to the botton move your thumb and hold on

 

[robertaccio]

"NEVER LIFT" dang I knew that Ajax had some Senna Formula 1 in his veins.

 

[BillO]

Weird, my '09 came with a 380 main and a 15 pilot. I never ran it that way and put the kit parts in the carb and the OEM 144 on it before starting it. But it seems the 'stock' jets for th '09s were a little random.

BTW, the OEM 144 is much stronger everywhere than the EG 144 on our '08 CR. The EG has a smoother transition from mid to to high, but that could be due to the moded PV spring on the '08.