Check the coil pack. And the pick up in the crankcase near the chain. It's like a lawnmower. There is a magnetic pickup behind the case cover near the chain. Could also be a clogged carburetor. But not always likely. Go after the pickup and you should regain your spark.
Is there gas or diesel in tank..nozzel can b mistaken. Is fuel gittn to carb. Cud hav vacuumleak. Ignition wiring worn like aplug cable. May hav ovrheated fora while..aircoold engines cant ride slow for long..they need to breathe lika horse
SOURCE: only runs on full throttle
Are you saying full throttle, or full choke? if full throttle, you should be able to set the idle up. the idle screw will be the one when you give it gas, it will be the screw on you'r throttle linkage. If full choke, maybe the spark arrestor is plugged. You can remove it by removing the muffler.It would be between the muffler and cylinder head. You don't need this to run.I hope any thing I posted will help.
SOURCE: 2003 yamaha 50hp 4 stroke, won't start
sounds like you are going to have to pull carbs off and clean jets also check tank and line for debries
SOURCE: Scooter will not start
I had the same problem. the drain hose on the carb is supposed to have a little valve in it. it is meant to drain your carb when you winterize, HOWEVER, they fall off and fuel runs out. Screw a small bolt into the end of the hose and bingo- it runs.
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SOURCE: I have a 2005 GMC Envoy and recently every time I
it sounds like the fuel level sensor in the gas tank is bad,causing a misreading and fluctuation,,replace it and that should help,,
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