piston issue

[mgs41987]

ordered a piston off ebay for my clr 125 and the one i have recieved is slightly different its slightly taller oil holes in the same places etc just height about 3 - 4mm will i be an issue

[Vincent]

[mgs41987]

it 3 mm bigger

[Vincent]

[dangerousdave]

If the skirt clears the crank then 3mm more on the skirt wont make a difference.

The problem comes if the longer skirt reduces the clearance to the crank webs to the point where it hits the crankshaft. Install the piston onto the con-rod and turn the engine over by hand. If it doesn't hit the crank, then it will work ok.

This is the problem with buying pattern parts - they aren't always the same as the standard parts in some ways. They usually work fine though.

If the piston you have bought off eBay is for a CLR125 then it will probably fit ok. If it doesn't then send it back.
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1988 Kawasaki KMX 200

Previous: Yamaha YZF1000, ZZR600, KMX200, DT50, KX80, CG125, PF50

[mgs41987]

ok cool will i have to assemble engine completely as its cam chain
to rotate it so i dont get my timings wrong

[Pete.]

[Vincent]

What would really help is a pic of the two offending pistiona's together
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Space Is Deep

[mgs41987]

its gudgeon to crown lol il order a genuine one

[dangerousdave]

... and send the other one back to where it came from for a full refund - they've sent you a part that doesn't even fit your bike.
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1988 Kawasaki KMX 200

Previous: Yamaha YZF1000, ZZR600, KMX200, DT50, KX80, CG125, PF50

[bikenut]

:karma: absolutely right, send it back and get proper one.

if piston sits 3mm higher then it will most probably hit the cylinder head, mangle plug and valves. compression height.

compression ratio would be effected if piston cleared.....but suspect valve may well crash with piston.

it may have been possible to fit head with out camshaft ( or rockers maybe ) so that the engine could be rotated to see if everything clears, but what about revs.....

the right thing to do is get correct piston and your money back for the incorrect one.yuo are protected by law

some pics would be nice......

[mgs41987]

fitted it and roatated engine and all seems fine no friction etc goes nice and smoothly no knocks etc would it be safe to put back in frame and start it up in peoples opinion and also i split the gasket where the barrel meets the bottom end where the cam chain goes through is that an issue could i put some liquid gasket in place as its not on the barrel part and only cam chain

[Vincent]

If the base gasket has just gone between the cam chain part and the inside of the barrel, ie; not between the barrel and the fresh air, I can't see it being a problem. If the motor is rebuilt and you're happy, you can't do much else than try and start it up Did you coat the rings in oil and smear a bit on the bore? If it runs rough at first, don't be tempted to rev the goolies off it thinking that will help. I've seen people do this loads of times.
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Space Is Deep

[Robby]

I'm somewhat confused, did you send it back for the right one, or just it anyway, knowing that it's the wrong part for your bike?

[Nope.]