- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
we are USA
no KB here, not a one., sorry why ask Yankee's this./..??
your machine shop would not ask that question.
a real overhaul (if measurements prove the case, all parts are MIKED)
1: measure bores. top/bottom and 90 degrees.
2: then bore and hone it to next oversize.
3: then new pistons and rings. and all new bearings
any thing, less is a DIY, trash build.
shade tree , hack.
(the Bernard Lawrence Madoff" ) way. (dig?)
there is one more way, if measurements warrant. IT.
new rings, std, size or what's there, now.
then keep old pistons if lands measure ok. (inspections here are many )
I guess you don't have the micrometer sets to do this right?
inside bore gauge. etc.?
what we do is take the block to a real machine shop
the mic it for a fee. (some do it for free)
then they tell you what is best, and is always the best answer.
why not let a pro rebuild your engine.
for max future life, not lowest cost and shortest life.
ask how to clean a block after honing
its not easy and must NOT BE SKIPPED.
ENGINE 2 stroke single cylinder direct reed valve crankcase induction Liquid cooled 125 cc engine Cylinder size 124 8 cc Bore and stroke 54 x 54 5 mm 200 cc engine Cylinder size 175 3 cc Bore and stroke 64 x 54 5 mm 250 cc engine Cylinder size 247 7 cc Bore and stroke 72 5 x 60 mm 280 cc engine Cylinder size 272 2 cc Bore and stroke 76 x 60 mm 300 cc engine Cylinder size 294 1 cc Bore and stroke 79 x 60 mm I Cant put periods or commas so bare with me
First thing is to tear it down and make sure you mark what pistons went in what cylinders. Then you will need to take precise measurments of the cylinders, looking for "out of round' and taper. This involves the use of micrometers. If the cylinders are within wear limits then you can just install new rings and hone the cylinder walls. If they are not then the block and all the pistons need to go to the machine shop for "boring out" the cylinders and pressing on new pistons. The crankshaft will also need to be measured at the bearing surfaces. If they are within wear limits then the crank can be polished and reused, if not then it has to be replaced. All cylinder head work needs to be done by a machine shop.
After all the measurments have been taken, the right size rings, and bearings can be ordered. Rebuilding an engine is not a task that should be done by a novice.