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yamaha 1973 GT 80



please can anyone help ? i have a 73 GT 80 has carb prob.! keeps
fouling plug ! need help with setting air/fuel/mix also oil injector
system bypassed ! fuel/oil premixed THANKS
In addition to what Krusty said.

Of course check carb function first, but you could have a bad seal
between the case halves it could be letting transmission oil leak in or
the crank seal could be leaking.

I've had leaks like this in an alarming number of bikes I've rebuilt. If
you just grab the flywheel and can jiggle it, even a little, it is a
sign the bottom end/bearings/seals are going south.
And the oil injector system is bypassed WHY?

[mythbusters]There's yer problem![/mythbusters]

That's there for a reason, and my injector system on my RZ-350 worked a
champ once it was properly adjusted.

Stop being ricky-racer and dicking around with premix.