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post #1 of 1 (permalink) Old 05-19-2014, 09:41 AM Thread Starter
Main Motorcycle: 1960 triumph 5ta
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Join Date: Sep 2012
Location: southampton england
Posts: 1
killing plugs!!!

Hi, I have just finished building a 5ta bobber which i previously owned some 22 years back, I have renewed coil, points , condenser, leads etc but I can only ride for 5 miles without killing the spark plugs....ive killed 3 sets so far, champion, ngk and some strange name japanese make ....when fitting new plugs its runs perfectly i ride for 10 minutes and it begins to miss, by the time im back home its got a regular miss then stops....remove the plug and its sooty from not firing properly.
I have bench tested all spent plugs with a decent coil and fresh battery and theres either a very intermittent weak spark or with most of them nothing at all.....In my experience i have had oily plugs last months , sooty plugs only requiring a clean and keep on going, even cooked plugs last, ive never had plugs fail like this....the engine is not overheating at all, it maybe guilty of running slightly rich if anything.....Im highly frustrated that i can not ride it and seem to go round in circles checking and rechecking everything.....Any suggestions would be greatly appreciated
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