This is not enough info to start. ..Hold the palm of your hand over the back of the carb and make sure its sealed against it... You need a helper to do this properly. The engine should pull on your hand inwards... if not....??
Did a shop or factory trained mechanic do the work? Are the reed valves able to open and stay closed? What does the compression gauge read? If you don't have one, beg borrow, buy, and/or take it to a shop and pay them to check it. Check it with the throttle wide open... with new piston and rings it should pump over 120+psi. ..easily.
Have the compression checked and then repost with the results.
Thanks!
as i said there is no suction at carb...did the work myself and yes i am a mechanic....cant get compression up over 90 psi.Bought from friend after he ran hot and shattered piston..he installed piston first and couldnt get compression up then i bought it and put different jug,piston and rings back...still same compression
Thanks for reposting with more details ... Could be a couple of things... the centercases may have been cracked when the piston exploded..one of the piston pieces gets caught under the con-rod and cracks the case (seen it more than once!!).. or.. one of the crankshaft oil seals has a bad leak or has popped out of the case ... this will also allow the compression to escape.
......As a mechanic, you should know this!!!!!.. AND NOT to rebuild an engine that has exploded a piston without splitting the cases and cleaning everything and checking for unseen damage!!!
ha ha...imn not a small engine guy and not much experience with two strokes.The oil seals are what ive been leaning towards.Funny thing is,i got it to crank and run even at idle.But after that,same thing.Dang near burned up starter that time!!!The cover over the clutch was puffin out smoke so i figured tha seals were stressed when my buddy ran it sooo hot he blowed piston.
Engines are engines,, the same theory of operation applies... Good Luck..
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