how can you tell what compression ratio you have? The only way i ever thought you could check thecompression would be by checking the psi. stock it should be 150-160 psi but with the hi comp pistion it should be 180 - 190. call greg a call and ask him, he could have just made an error andsent out the wrong pistion. I hope the pistions are 10:5:1 compression because i am having him rebuild my whole engine (top and bottom) and i had him put one of those pistons in.

 

wv4wheeler, so what happened. did you contact greg about it?

 

your stock piston don't come all the way up to the top of the cylinder. the one i ordered was supposed to come to the top of the cylinder thus compressing the air mixture in the combustion chamber more but when i measured the hieght of the piston from the wrist pin up it was the same hieght as the stock one. so the compression would have been the same. i called greg and talked to him about what i had found, he called namura who makes the piston and they told him that it was a misprint in the catalog. greg told me to send the piston back and he would refund my money. he told me he was going to talk to je piston about fabing him some high comp. piston though. he has je make the piston for his big bore kit and it is supposed to be 11.0 comp. i'm going to go with the big bore kit now i guess. i took my lakota down to get more power and thats the only way your going to get much power is by uping the comp. you won't gain much power just boring the cylinder .040 or .060 over.

 

ya, i asked greg about the piston being hi compression or not and he said that the piston isnt but he did somthing to my cylinder head to gove it 10:5:1 compression. he told me about the JE pistions too and i was thinking of getting one when they are made but they are a bit pricy at 180.00 a kit.

 

go for the 300ex, way better that a blaster

 

you can shave the top of the cylinder down some to get more compression but your timing chain goes up the side of the cylinder so when you shave the cylinder its going to cause a little slack in your timing chain. i dont know but that might cause your timing to wear prematurely.