Okay, still haven't gotten it running. It comes close to turning over, even firing once or twice, but does not run.
When it died, it had a big drop in performance (from 30 mph to 10) right away and then it felt like it was only firing on a few strokes, less and less over a period of maybe 20 minutes, until it died completely.
The following has been done checked:
- Spark is a lovely fat blue-white, with a new plug. Timing has been properly set. Twice!
- Fuel flows freely to the carb and all carb ports/pipes are clean and free of blockage and the float moves freely.
- Compression is excellent, the testing gauge I borrowed gave me readings ranging from 80 - 150, (it was just a basic gauge, over the several times I tested it, it was usually in the neighbourhood of 120)
- Piston head and cylinder look fine through the ports and the rings are in very good shape.
- Air filter is clean and free from any obstruction.
- Exhaust and exhaust port are free from carbon and any obstructions.
- Clutch engages well.
I'm seriously confused at this point.
I thin the problem MIGHT still be in the carb, but to all appearances it should be fine - if ONLY because I know for SURE that the spark is good and well timed and the compression is good. The throttle and choke do not feel loose at all and pulls well on the throttle slide moves well, as does the choke.
Earlier, after I cleaned out the carb (for a second time) it ran for about one-two seconds (NO more) before dying. but each time I tried to run it after it wouldn't even get going other than a fire or two. Someone suggested it might be flooding and admittedly, there is an amount of blackened, gas-oil mix that comes out as I try to run it, but I don't know if it's flooding or that's just the unburnt gas from when I crank the throttle to try and start it.
It will not run when I squirt gas or lighter fluid in the cylinder, but it's a messy process and it's hard to funnel gas in there (it's not very accessible, for instance the fins and decompressor mechanism prevented me from doing a basic compression test with my thumb, even though that's way inaccurate), so I'm fairly certain that's only me and not the cylinder.
I really have no idea what the problem could be at this point. I COULD just buy another carb, but that will wind up costing me at least $130 or so ($90 carb + $30 intake manifold + at least $10 to have the manifold shaped to fit). That's $130 I really don't have right now. I'll spend that money if I HAVE to, but I don't want to blow all that only to find it STILL doesn't work, or that there was some much simpler, smaller, cheaper thing I could have done.
I really would appreciate some help or ideas with this. Thanks.