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OK, this is weird....
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Posted by: Succubus
The continuing saga of the DT1 restoration has taken a turn into the surreal. Suggestions please....
Freshly bored cylinder, new piston, new rings, new bearings all around, case and connecting rod. So I kick it the first time and it kicks back pretty violently. I figure the timing is off. Anyway, I kick it the second time and it starts. Beautiful sound. But then, without prompting from me, and witout the application of any throttle, the motor starts to slowly wind up. It starts to rev high and I don't like it, so I hit the kill switch. Nothing, the rev continues to rise. OK, no problem I figure, I reach down and pull off the spark plug cap. Guess what, the rev continues to rise - without spark. I flip the petcock and after a few seconds the motor stops. I am very grateful, at this point, that I wasn't test riding the bike. I figure its the new piston rings and cylinder wall getting to know each other. I start it again. This time, though, I let the carb fill and then shut off the petcock before starting it. The same thing happens. Kick switch ineffectual. Pulling the plug cap and removing all spark doesn't stop the motor. It doesn't stop til it runs out of fuel. I've seen gasoline motors diesel, but this is pretty extreme. Can it be a case of the timing being so bad that the bike will run off the heat of the cylinder, like a diesel? And where is the gas that is making the engine rev coming from if I'm not giving it throttle? I haven't yet determined a way to precisely set the timing yet, other than gapping the points. Can I stop this phenomenon by adjusting the point gap? If so, wider or narrower? I am very reluctant to start the bike again until I make some type of adjustment The thing I love about working on these old engines is figuring out why the weird stuff happens, but I'm open for suggestions on this situation.
THanks, in advance, for your knowledge and advice.
Pat
Posted by: Succubus
Never mind, air leak. Lesson: don't hook up the oil lines if you don't plan to use the oil pump. Thirty-six year old lines sometimes leak. Nuff said.
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