Help needed ASAP!!! **UPDATE** on pg. 2  By  dykimusprime (Read 1,452 times)

A slide caliper is too big to get in there. What you really need is a set of feeler gauges. They don't cost much. If you can get a set that are pre-bent like this, so much the better.



Make sure you get a set that has the smaller ranges down to 0.002" or 0.003"

The other option would be to use pieces of paper or plastic that you have pre-meaured separately with your calipers or micrometer so you know that they are the correct thickness that you want to set for.

I put everything back together & when I tried to crank it up, I noticed a Smokey mist coming from the carb..

The bearings on the cam should turn freely and silently, so whether or not that is the source of your current noise, you have at least averted another problem coming in the near future.

Having mist come back out the carburetor is not all that unusual and not necessarily an indication of a problem with the carburetor. Just that compressed air from the cylinder is burping out the wrong direction. The cams are already fairly aggresive on these small motors so if the timing is off a bit or one of the valves isn't sealing well or the crank kicks backwards it will do that.

The fact that you had a top end bearing failure is worrisome. It may have been a factory defect, but it may also be a symptom of oil starvation and overheating. We'll have rely on your judgement as to what sort of noise you're hearing, (any chance of an audio clip or walk around video?) If there's a chance that the noise is a mid frequency clunking rather than a higher pitch tapping, then maybe the oil problem turned in to a rod knocking.

Since your machine is offline anyway it might be worth your while to drop the motor out and pull the rest of the top end to find out what condition the rod and the piston and rings are in. You know, since you're already half way there...

Just do a search on youtube for "GY6 Top End"