Won't restart after over revving

[wally]

Hi All,
I started my 51 Golden Flash after 2 years storage. I had drained the fuel from the tank & carb.... Fresh fuel, checked spark, started 2nd kick. Ran well at idle, blipped the throttle, the Monoblock's slide stuck open & she revved hard for a second before I could stop it. Have tried to start it since after oiling the slide... not even a kick. Took the valve covers off, the valves are opening and closing. Any ideas why she won't fire?
Wal

[CheeserBeezer]

Maybe something to do with the points. Check spark and ignition timing?

[Ted_Flash]

There shouldn't be any oil in the carb.  Has some run down and blocked the pilot jet?

[sean]

been sitting for 2 years ?
have you drained the crankcase ?
has the oil you put in the slide fouled the plug ?
does the carb slide bottom out in the bore ?
is the spark plug wet , and still sparking ?

[wally]

Thanks Sean, Ted & Cheeser, 
Yes, fresh oil, & only a smear of oil on slide & it now bottoms out. The plug is wet & sparking.
I think the problem is timing, perhaps killing the engine abruptly whilst at high revs has caused slippage.

[CheeserBeezer]

Stripped ATD gear?

[Rex]

The previous owner of my Venom over-revved it when he missed a gear, and the valves tangled.
The "tilted" valve head wasn't obvious until the valve was removed though.

[Triton Thrasher]

Thanks Sean, Ted & Cheeser, 
Yes, fresh oil, & only a smear of oil on slide & it now bottoms out. The plug is wet & sparking.
I think the problem is timing, perhaps killing the engine abruptly whilst at high revs has caused slippage.

Checking ignition timing with a stick takes about 5 minutes.

Correcting it takes longer!

[BagONails]

If a valve has kissed a piston a compression/leak down check should tell you, quick and easy to do.

[wally]

Thanks Bago & Triton, those tests are todays mission.
Wal

[wally]

Hi All,
Thanks for your advise.
I checked the timing, (several times) using the cigarette paper method; spot on.
Tried the thumb test for compression; it has some.
I've borrowed a screw-in tester; the instructions say warm the engine up; I wish.
My question is...what could be the acceptable reading difference be between hot test & cold? 

[sean]

Do a test on the difference between the cylinders… choke off throttle wide open

[wally]

Thanks Sean,
I'll find out at least the cold engine values.

[morris]

On a cold engine I get a maximum reading of 110 psi

[wally]

Thanks Morris...................Wal