yx150 shooting flames out exhaust

[UU4444]

My yx150 with a 26mm OKO flat slide carb run good for first few rides now it is shooting flames out exhaust and back firing at high rpm. Does anyone have any ideas wether i should be looking at ignition timing or valve clearances? thanks

[pitfactaX]

Holy shit lol shooting flames ?

[I_THUMP]

Sounds like too much fuel getting through and it gets into the exhaust and burns which creates the flames.

[Pitst3r X4]

Originally Posted by I_THUMP

Sounds like too much fuel getting through and it gets into the exhaust and burns which creates the flames.

Spot on that's what i think too or your spark plug is knackered!

[coolmodee01]

either carby not sealing

bent zorst valve

or zorst not sealing and has got no back pressure and you have now bent your valve

[kaneo]

More likely to be your ignition timing too retarded. As a guide, backfiring out exhaust means timing too retarded, and backfiring out the carby is timing too advanced. The bolts may have come loose in your rotor plate.

[UU4444]

i have an inner rotar kit standard on the 150 DHZ need help on setting timing as i have had little to do with these.

[kaneo]

Ask cactus jack, he will be able to sort you out in great detail. What he doesnt know about these bikes aint worth knowing.