Cylinder/Head Pics. Whatcha Think?

[atc007]

I would have told him that, but my magical over-the-internet snap gauge and caliper are in the shop.

Have it measured. You may be able to just hone it.

He can absolutely hone it!! And put in fresh rings and not even a piston!! BUT,,if he wants it right and tight,he needs to bore it,,which he already knows. Do it once,do it right.

[atc007]

which ports should he clean? looking down the bore they all looked clear... or missing?

The pics are of the cylinder. It's a 4 stroke,so the ports are in the head. They carbon up on the exhaust and need cleaned out,and preferably at least polished up. Makes a noticeable difference in power.

[fabiodriven]

BUT,,if he wants it right and tight,he needs to bore it,,which he already knows. Do it once,do it right.

Not true. If it's within spec there is no need to bore it. It would be a waste. A hone and rings are as good as new as long as the bore is good and the piston isn't damaged.

[atc007]

Anyone who's built engines for decades can CLEARLY see after that cylinder is honed out to perfection. It is not even CLOSE to being tight and correct. Believe what you will. I never wished for my customers to have fresh compression for awhile,then piston slap thereafter.

[fabiodriven]

I'm not even sure what that's supposed to mean. I've built plenty of engines and used to work in a machine shop that did boring and sleeving.

[pcs]

Gonna go Wiseco, the 10.25 to 1. Got the chain already, will order tensioner guide and chain guide when I order the piston. I may have some luck with the kicker gears, as it had a Goki e-starter on it when I got it, so I'm hoping the kicker isn't too worn. Researching the spring(s) necessary to tighten up the kicker before I put it back together. That would SUCK! Thanks, all...

i just finished mine up the the same piston. runs well, it wasnt running before i got it so i cant do a before and after comparison, but my friend has a stock one i compared mine to. his had a fresh stock top end on it before he stop ridding it last year so it still has good compression. both have stock carbs. my head has a gasket match port and 3 angle valve job, mine has a cobra exhaust and his is just a straight pipe to the back. he has 21" rear tires and i have 22". i weigh 170 and he is 125. by the time i hit 4th gear im about 3-4 atc lengths ahead so its a nice bump in power if you port the head as well.