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Discussion Starter · #1 ·
Hi

I have a quadrunner 1992. Normally it runs great but now it not really want to start. Some time it starts but no more than 10 secs and stop. After it is really hard to restart. I have changed the sparkplug and first start it was running like a new one. I parked it and th day after mostly impossible to start. I have put some gas in carburetor but it changes nothing.

Is some have any idea what to investigate.

Thanks
 

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black, is fouled, could mean a couple of things.

pull the new spark plug and see what it looks like, if also black. I bet a new spark plug will make it run again!
but as you guessed it, it will get fouled again.

It is possible the machine is due on some maintenance, valve adjustment, compression check, carb clean
also the spark plug coil may be going bad, hence the weak spark that can cause fouling.
 

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Put gas directly in cylinder, see if it runs, then stalls. If so, fuel delivery issue. Clean fuel system.
 
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