Another 1166 Thread

[gs1150streetracer]

Hello,I finally got to taking my 1982 gs1166 engine apart after playing hell trying to figure out why it smoked like a freight train and usually overheated.I took the engine apart finding 75mm pistons of some make im wiseco im thinking?,This is what i found.I cleaned 1 and 4 pistions with a wire brush before the pictures.




The valve seals looked to be soft and green nothing looked cracked.Im no expert but once the cylinder head was off you could push the pistons to the front and the the back a good bit of play,I figured it was the rings but after a ring cap test in the cylinders they looked to spec.Then I tried what people on GSR had done by placeing the pistion upside down in the cylinder and checking the piston to cylinder clearance,I read some where was to be up to .004 i could fit a .009 no problem on the skirt..Could this what caused all the smoke on start up and sometimes down the road.Time for a new cylinder block or??Any input would be great I just bought this cylinder head http://cgi.ebay.com/ebaymotors/SUZUK...Q5fAccessories
And plan to re-ring and a set of APE studs.

[gearhead13]

Im not an expert, but you should be measuring the piston at the thrust surface, perpindicular to the wrist pin. How do the skirts look? worn? maybe it was bored wrong. A piston rocking too much in the bore can allow the rings to not seal on the bore properly. Smoke at startup to me means valve seals.
They look like wisecos to me, except mine didnt have the round raised? area in the middle.

[doctorgonzo]

If you have a can of Berrymans, drop those pistons in there, after a night's soak they'll wipe clean as a whistle.

[sparki]

those are wiseco pistons