robw
Thrash Merchant
Posts: 362
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Post by robw on May 11, 2013 10:53:07 GMT 1
Hi, just rebuilt my Yamagamma and have managed to get it running for a few seconds, then a couple of things happen.
1. There is a loud backfire
2. The power valve cycles just before the engine cuts out
Are the problems linked?
It has a dyno coil fitted 3 ohms(green) and the carbs have been checked/synchronised
Cheers Rob
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robw
Thrash Merchant
Posts: 362
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Post by robw on May 11, 2013 12:09:52 GMT 1
First fault found wrong bowl on carbs, moved the one with the drilling to choke side now.
Still doesn't want to run, it will fire then cut out
Rob
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Post by johnlc on May 11, 2013 12:16:30 GMT 1
Coil resistance is massively too big should be around 0.33ohms max I have a .7 ohms in mine which is a bit vloser to the mark
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robw
Thrash Merchant
Posts: 362
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Post by robw on May 11, 2013 12:31:31 GMT 1
Just got it running, sounds great. Exhaust is cracked but new TSA one on its way
Rob
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Post by soccersmyth on May 11, 2013 20:01:09 GMT 1
Was it the coil that was stopping it from running ?
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robw
Thrash Merchant
Posts: 362
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Post by robw on May 11, 2013 20:56:01 GMT 1
Hi, it came with the coil fitted but I will investigate its suitability
Fault 2 was the spark plug lead arching onto the head near the coil end, brand new leads from vehicle wiring products, so I fitted a new Taylor lead and it starts and runs really well now
Rob
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