150cc peace sport tpgs 804, piston By fox83 (Read 7,479 times)

[Alleyoop]

If you don't have a compression gauge use the Old finger trick. Stick your finger in the hole and hold it nice and snug and HOLD THE THROTTLE WIDE OPEN and crank it. IF it has descent compression it will LIFT YOUR FINGER OFF THE HOLE if you just feel some pressure then it is down on compression.
If gauge it should be over 120psi if under then you have a leaky thingy
Alleyoop

[czmdiver]

Aug 6, 2015 17:38:09 GMT -6 fox83 said:

Thx brotha I'm trying. Um what's the gap on the rings should be. Like .010 ins or something? Trying to test the compression swell

Minimum Ring gap is .003-.004 Gap per inches of Bore.
Don't worry bout a gap at .015-.018, it'll have plenty of compression.

The "in"= Intake valve on the piston dome.
Dunno if the valve will make contact if in backwards but the Wrist Pin is Offset and she'll clunk

[fox83]

Ok imma put it all back together sat and ill update. Its been to much of a headache

[fox83]

All the things I've read say put the larger or deeper hollow on botn, but the bigger on hasthe in rifht above. So I went ahead and put the in (deeper hollow) into the up position.so I hope its right.lol

[fox83]

Ok I got one of those little cone air filters. Should be here Saturday, just wondering if I should get new jets? Or just another whole new carb. I mean the one I just got worked great for a few days then bam allthese problems. Right niw I have a 35 and a 107 (also spare 150 ) so what you guys think

[fox83]

[fox83]

Ok that's old piston the in is to the right with bigger hollow for exhaust o the left. U cam tell right away which is bigger now imma post my new one

[fox83]

[fox83]

The in is on thrle right again but so is the deep hollow plu the gap on my top ring is like .020

[fox83]

[fox83]

Any ideas on my piston?

[Alleyoop]

To me the In on the new piston looks bigger than the Exhaust.
Alleyoop

[fox83]

See me to. But shouldn't the exhaust have a larger hollow. I reinstalled wiyh the in facing down. Havent finished yet. Hell if it screws it up ill just by another. Unless you know its goin to mess it up then I won't...ally?

[Alleyoop]

Don't know what to tell you but to me the in looks bigger, So put it in and turn the motor over by hand get a socket on the flywheel nut and turn it CLOCKWISE do not try to start it and see if it binds or you hear something hitting the top of the piston. You could get some putty and put a little about 1/16 layer in each indentation and see how the valves squish it to see how they are going into the slots.
Alleyoop

[fox83]

Thx bro. Ill try by hand