Blown 80cc HT engine

[crassius]

make sure piston is right way around, as that is common cause for breaking rings - I doubt I'd ever run that motor again unless I were totally sure I'd found all pieces of those rings

 

[Frankfort MB's]

In the middle picture if you look to the far back beside the crank you can see a fragment melted to bottom end

 

[sbest]

Ring doesn't appear broken, pin looks fine. I see the bit of junk in the crank. Where did it come from?
This engine looks pretty good, rescuable. Pull her apart and clean her out?

Lots of blowby on the piston and rings don't look seated.

Steve

 

[Frankfort MB's]

Yeah I know, I went through 2 sets of rings the first time I took the motor apart and a peice of one of the rings must have fell down in the bottom end, for the blowby I just switched the rings around and double checked how they were seated on the piston, the engine should look good it's only got 150 miles on it lol

 

[crassius]

your fingers in pic are coated with metal debris - no telling what's in bearings - clean everything REALLY well

 

[Frankfort MB's]

I made sure I shouldn't have to take motor apart again.... Soaked everything in 2 stroke oil for safety

 

[crassius]

before or after washing out cases really well?

 

[Frankfort MB's]

After, most of the peices come out after a very firm shaking, double checked everything afterwards though

 

[butre]

looking at that picture it appears a stud has punctured the case. that's meant to be a blind hole. tear it down completely and get that metal debris out, then jb-weld the stud in place making sure it's an airtight seal.

 

[Frankfort MB's]

It was a ring that I broke and it ended up in the bottom end, waiting on head gasket to put back together