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Rusty beat me.
Thinking about what can happen when things get hot. Valve clearances can close, causing a drop in compression.
The carburetor can get too hot, and the fuel does not vaporize correctly.
Early push rod Volvo and some British cars had that problem. 1/4" spaces helped.
Does the fuel pump push fuel up? Or is it a vacuum to suck the fuel from the tank. If it is a vacuum, fuel should flow in the prime position. If it is a pump, check for fuel flow while cranking. then check for spark, and check compression. Some coils fail when hot. Sometimes you have spark when testing, but not enough spark when the plug is in the hole. Open the plug gap to 50 thou, or cut off the tip, and check for spark.

Bon chance. UK
 

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It was unfortunate that while Europe was working on ISO 90 ? standards of quality, that the US was slow to adopt, that now we import soooooo much ****, that would never come close to meeting any minimum standard of quality.

Yet my $14.95 electric shaver works fine. My $150.00 generator runs fine.

Miss M, think of how good it is going to feel, when you get the scooter running sweet.

UK
 

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In the early days of idiot boxes ( CDI about 69 / 70 ) they would fail if they got wet, or if the humidity was high. The 350 Kawasaki dirt bike was the worst. The V4 Johnson and Evinrude outboard motors also had problems.

Now they we have reverted to old technology with the Chinese products, I can believe the idiot box could easily fail. We could test the early units, but there was no way to fix them.

A light just went off between my ears. My 6 hp Evinrude idiot box failed.
NAPA had one for much less $$.

UK
 

Premium Member
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Back in the day, Honda had smaller / tighter valve clearance than the others. We can assume they had better control of expansion due to heat.
I would not trust a China clone with the same clearances.
Once upon a time nearly all engines would tick, from the valves. And that is always preferable, or better than no sound.
Also used to be the rocker would get dished, so instead of 6 thou we would set at 5. As long as we could hear a tick we felt safe.

Fast forward with shims. Same story. The Suzuki shop tells the same story with my SV1000. " they usually tighten a bit, yours is good with a bit of noise "

Maybe one day I will write about valve timing, the final frontier. And why lining up the dots is not accurate enuf for a decent engine.

UK Does enuf have 2 f's
 
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