Dirtbike Trouble
 

I have just bought a 2002 Yamaha WR426F which feels like it has a fueling problem but only in 5th gear under load. It feels like I am running out of fuel but it is too uniform, it picks up then backs off around 2 times a second - constant. I have just had it set up with brand new factory jets at factory settings by a garage, they then road tested it and it was still there. They then tried two different clutches, but it is still there. It seems odd that it is only in 5th as when the WR's have a gearbox problem (I don't think this has) it is normally 3rd that plays up. Could it be something as simple as a sparkplug or HT lead?

Any help would be greatfully recieved - I'll buy you a virtual beer

Paul

BDG might be able to shed some light on this...

Sounds a very strange, best i can suggest is give Terry Sylvesters a call on 01484 683665.

They specialise in Yamaha dirt bikes and are very good.

They're in Holmfirth in Yorkshire, don't know where you are but may well be able to give you a few ideas over the phone if nowt else.

Pretty quick those wr426's, hope you get it sorted.