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Whenever an engine overheat happens both piston and ignition component damage is suspect. The engine would need both it's compression and spark output tested to get you pointed in the right direction. Has that been done yet?
No, that could give a false result. What you would need is either a timing light or an adjustable gap spark tester.
Click this link below, this s a video that shows how to test both. Both sets of tools can be had a most autoparts stores.
This is just to get you pointed in the right direction. If it has low compression then there would be piston damage, and the engine would need to come apart to see how bad it is. If it has no spark, more tools would be required to figure out why.
Let me know what you think after watching the video
Now that you have watched it what do you think? Is that something you can do?
Okay let me know how you get for results.
Got it. Next step is compression. Let me know what you get for numbers there.
Also, do you have a serial number on this engine?
Got it. Let me know what you get for compression numbers and we'll take it from there.
No problem, there are no time limits here. Just post back when you have a result.
Enjoy the rest of your night.
That would be way to low. You are looking for 90 psi or better. If those numbers are accurate the cylinder walls are going to be scored up, and the engine is going to be shot. At this point getting another compression tester would be like getting another opinion. So definitely get your hands on a decent quality one and not a harbor freight special, and double check it. Does that make sense?
That's still going to be an issue, that 75 is to low. Do you happen to have a serial number on this engine, I want to run it and see if this one has a cylinder head or not .
Got it. There is no head on this one
It's more than likely going to be a bad cylinder. But just for the heck of it If you place your palm over the #1 carb and crank the engine over, do you feel any blowback against your palm, or is it all suction?
Just the airbox
There should be 4 screws holding that air box cover on.
Hmmm.... no, this is just the black plastic cover in front of the carbs. send me a picture of what your looking at.
It doesn't match my manual, but looks that way to.
Gotcha. At this point unfortunately the #1 cylinder is damaged as a result of overheating. Whether it's the actual cylinder walls, or the pistons, or both, can't be known until disassembly is done. But at this point the block would need to be torn down to see how extensive the damage is.
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It really depends on how much damage there is and if machine shop work is needed. But on something like this worst case scenario is going to be in the 1400/1500 range.
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