Bluesman
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Jack of many trades
Posts: 108
Malmö, Sweden
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AFter you check the voltage.....get yourself a can of start gas/ether and a FRESH plug. The one you have must have been totally drenched during your efforts.
Seriously - change it, and donīt crank the engine just yet. Hereīs a sure-fire way to troubleshoot this:
Close the petcock. Pull the supply hose between the petcock and carb. DRAIN the carb (loosen the screw underneath the float bowl) to prevent any stale or contaminated gas to reach the engine. Push the choke lever all the way in. Now, take the air filter off to get access to the inlet of the carb. Lift the slider to about half throttle, and stick a 10mm drill bit into the carb, just far enough to keep the slider quarter-way open or so. Switch ignition on, spray a 2 second squirt as far as you can into the inlet opening, under the slider. Then crank it.
(Start gas will fire under the most crappy compression conditions, and for the tiniest spark, and in a totally oiled up cylinder, even with the decomp valve partly open.)
If it wonīt fire at all with a FRESH plug, your ignition timing is off a lot for some reason. If it backfires, and refuses to run properly for a second or two, it may be off a tooth or so. If it runs properly for a second...and fires up properly if you repeat the above a couple of times, all is well with the timing and plug.
..take the drill bit out. Reconnect the fuel hose, make sure the vacuum hose is ok and connected and put the petcock on PRI for 4-5 secs, then close it. That should give you gas enough in the float bowl to try again without drenching the carb. Stay off the choke. Crank it at practically no throttle.
Any results? Start? Cool. Now you know it was the plug all along.
No start? From there, itīs a carb cleaning job and time to swap the gas in the tank. Gas gets stale in 3-4 months over here, especially low-price stuff.
(Been there, wasted one month and a lot of cash by looking in the wrong places)
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