another piston question

[bagds101]

i know theres a bore size chart but i didnt know what to type in the search and couldnt find it when i did. but on the top of my piston it says 6700. does that mean i have a 67mm piston in there? cause isnt stock like 66 or something?

 

[OConnor Racing]

You have a 67mm piston and yes, stock is 66.

 

[bagds101]

ok. so that probably means it was blown up before and then re sized the next size up?... and also today i decided to tear down my engine and replace all of my gaskets to try and find my damn air leak. well i put everything back together and when i was tightening the head, 3 bolts didnt tighten. and i still had a gap between my head and cylinder. so i pulled the head back off and 3 bolts came out with it. i look in the bolt holes and theyre stripped. now what? do i need a new top end? or can i just re tap those old holes?

 

[brandoz28]

time serts are the best option, then heli-coils.

67mm is the 4th size up from stock. it goes in .25mm increments.

 

[bagds101]

ok my dad said to use heli coils but when the bolts pulled out, it pulled a bunch of the cylinder with it. but if anyone has a jug in good shape before i go use heli coils then pm me... but where do i find time serts?

 

[OConnor Racing]

You don't need a new cylinder. The material that came out with the stud is less than the drill is going to take. You can get a heli-Coil repair kit for less than $30. I'm pretty sure you need a 8mm x 1.25.

 

[super noober]

You don't need a new cylinder. The material that came out with the stud is less than the drill is going to take. You can get a heli-Coil repair kit for less than $30. I'm pretty sure you need a 8mm x 1.25.

yes 8x1.25 is what you need, i also like to put a sh*tload of red locktite in the stud hole also to help hold things.

 

[bagds101]

awesome help guys. i will call around in a little while. see what would i do if my wife kept me off her computer?