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pistons are not round. they are oval. 030 is .75mm. 040 is 1mm over. if it has "art" stamped on the skirt, its an original honda part. if it says 030, it is third over. depending on what your planning on doing with the bike, that will depend on your bore clearances. i think, .0010-.0015 is the area youre looking for for piston clearance. give them to the shop when you bore them, and tell them its a street bike, or a race bike and they should be able to do what will work. but you can shoot for .0012. this is all of course applying to a cast piston. if its forged, well, youll have to wait for someone else to chime in. im not 100% up on those dims.

jc

i dont know shit
 

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you dont need a ring compressor, just shove em in. the oil filter tool you ca make from an old socket and a grinder, (13/16") or there abouts. if you want. the valves spring com you can make with a large c clamp and some angle stock.

its how we do it at fathouse racing.

jc

i dont know shit
 

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lowtech for highperformance!
cant afford those cool parts if all yer money goes to tools ya know.

i made a valve spring compressor when i realized mine was gone. it was late, and i just couldnt wait to put the valves back in the motor. so i made one from 2 pieces of angled bar stock welded opposing each other to a large c clamp. i actually copied it from chris. but you can use a large old socket the same. just cut a hole in the side so you can probe out the keepers at the cap. its how i learned to weld! yeah, im an awesome welder. (that was sarcasm)


jc

i dont know shit
 
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