I don't think you have a burnt valve. Sounds to me like low fluid in the
dashpots. If not that, I would also check my points. I've had similar problems
caused by incorrect dwell angle.
Shawn
Michael Graziano wrote:
> Oh yeah. At idle, (1k rpm) the engine is stumbling a little. Not stalling,
> just running a little rough. And when you goose it quick, there's a slight
> hesitation and a cough (though the carb, that's when I scared myself). The
> plugs are clean (no oil, and no black sooty stuff, in fact, they were a
> little white the last few times I pulled them). ANd my compression is OK.
> All within 5 except one within 10 psi (approx. 125 to 135).
>
> Could a valve be burnt? And maybe I'm still testing for intake manifold
> leaks incorrectly. What is a tried and true procedure that some of you
> folks have tried?
>
> Michael
>
> <mgrazian wrote>
>
> Hey folks.
>
> I checked and readjusted the valves this weekend. A few questions arose. I
> think the valve gaps were in OK shape. They were supposed to be set at
> 0.010 inches. I found some that were as far open as 0.013. Does that make
> a significant difference? Is it OK to reuse the gasket as it was in good
> shape, and I used some permatex black gasket glue to help with the seal. I
> have a new one that I bought for the job, but misplaced it.
>
> Also, the intake was still backfiring. I rechecked for leaks on the intake
> manifold. Nothing found (doesn't mean nothing there). I enrichened the
> mixture a little. Now the exhaust smells a little like gas, and it still
> backfires throught the carb. Nearly scared the S#$% out of me when I had my
> hand outside the carb barrel and it backfired.
>
> I've got the timing at 10BTDC, from Bentley's and Haynes. Should I advance
> it more or less as the next test (or should I test something else first).
> And if I advance it, is that more towards 12BTDC or 8BTDC.
>
> I'm determined to solve this damm thing. Even if I have to take a shotgun
> to the engine. At least it won't backfire anymore. ;-)
>
> Mike
>
> BTW: I changed the accelerator cable with one from a bicycle brake. I
> can't believe what a difference it makes. ANd for only $3.
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