The heads and head gaskets for these are reallly terrible- designed to have a problem I think
The gasket usually doesn't even come close to the diameter of the cylinder itself- the head rests on the small circular ring and when then combined with the flimsy gasket- only about a half of the stupid little ring and the gasket make contact to seal the head-
I have one gasket on my 50 out of the three gaskets I have that actually comes up to the cylinder edge and crosses the entire raised ring on the head. I have another head that was leaking I've now filed completely flat- completely free of the elevated ring- I totally filed it down but as yet have to try it out- I'm sure it will work great though now with ANY of the gaskets - may even raise the compression bit and slightly cuts down the cubic inches- the plug will still clear but maybe not any long one! At any rate, the head should now use the ENTIRE gasket to seal- not just half the surface of the raised ring!
I was gonna post a thread, but have been busy.
Here is a picture of what I mean about the gaskets- only one out of three I have for my 50 cc get near to the diameter of the cylinder- this one here is a full 1/8" inch away and covers only HALF the raised area
The second picture shows the head with the ring not quite filed away
Yeah thats true. My ring was almost gone when I bought the (old) engine (with the bike I then rebuilt) and who ever used the engine top before me, didnt even use a gasket, but now I took off the rest of the ring completely. The GT5 I got 2 weeks ago had a much higher ring, so that the head would only sit on the ring instead of the whole surface wich caused the same problem. A tiny gap in the front and read of the head where little oil and sure big part of the compression was lost.
I bought another gasket kit because I had to open and close the head so often because of the compression problems I had with the new engine, that in the end the piston hit the head or gasket. So now I am using 2 bottom gaskets, one head gasket and the head is flat and clean almost polished flat.
Now I just have to do something about the heat problem. I moved the clip for the needle from 2 to 4 because it was too lean I think. I want to make sure the engine gets more fuel for cooling. I dont mind wasting more gas.
BTW whats the 3rd pic? haha
