SOURCE: yamaha dt 200 won't rev off idle
You should measure the combustion ratio.Maybe piston rings failed.
SOURCE: find fz750 manual
Here is the site you can get user manual http://www.ebookspdf.com/search/Yamaha+FZ+750+repair+manual
I’m happy to assist further over the phone at https://www.6ya.com/expert/ramy_d9e7ebea3891f482
SOURCE: yamaha blaster runs but wont rev
ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.
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SOURCE: Yamaha DT 125 1986 - High Revs when idling
i would say the answer from polar cycle is good...but if it is not the case....you may take a look at crankshaft seal..sometimes the primary compression is not good if cranks seal leaks and it make the bike running lean in gaz and having you're idle getting up sometimes.........check the transmission oil if its low in quantity even after replacing it recently (this means that you're transmission oil is getting burn by you're motor) and also remove the magneto cover to see if there is gaz accumulation in that area...if so that means the seal leaks on the magneto side.....
Testimonial: "After finally rebuilding the carbs and replacing the reeds and air filter, the problem was actually solved by replacing the crank seal. "
SOURCE: 1986 Yamaha FZ750. Idle Timing problem. NEED HELP!
what the hell 45 1/4 turns budy the idle screw should be turned in till it idles at 1000rpm and the over is the mixture screw the mixture screw should be 2 1/2 turns out from being all the way in get back to me with results
Testimonial: "Appreciate it. Any further help would be awesome."
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