300/440/550 I beg you for help weathers to beautiful!

[D3vinKozak]

Helllooo everyone, pleasure to meet such knowledgeable individuals! Ive Tore down all kinds of motors to nuts and bolts, but last week bought my first ski- 85 Kawi 550. i was pumped as can be to learn something new and tinker with the thing until i realized it wouldnt start...

---compression Test: Rear cylinder-GooD! Front Cylinder...well piston moves but wont even blow my thumb off the spark plug hole...:thumbsdown:

*That front cylinder, is whats keeping me ashore here in michigan, i live on the lake and all i can do is watch.


--- popped the cover off the top of the jugs, piston is moving when i turn it over, cylinders are not badly scored, no holes in piston no carbon the damn thing looks good,but wont compress me some air.

--- I contacted the moron i got it from (200$) and ask him why he sold me a blown motor in it, he claims it ran PERFECT 5 years ago... So after hootin n hollerin he agreed to give me another kawi 550 he has for parts in exchange for the headache.


MY QUESTION IS: WHY THE HELL IS THERE NO COMPRESSION IF THE PISTON HAS A GOOD SEAL TO THE CYLINDER!?

 

[Jetpilot106]

well obviously something doesnt have a good seal.my old ski when i took it out of storage when i first got it the piston rings where stuck and it didnt have any compression.could of been sitting for longer then the said 5 years

 

[yamadog282]

u may want to mic the piston and cylinder to check for proper clearance,make sur the piston ring gaps are offset and check the o ring for the head...strt there and see what happens

 

[clayton78]

What about the head gasket? How did that look?

 

[Joker]

Ya one small hole in the crush ring or metal will create very little comp at all. You may just need a new head gasket. Otherwise I would then check piston and ring clearance.