installing a stock bore piston

[cals400ex]

i never really understood this too much because i know nothing about the nikasil plated sleeves. if you put in a stock bore, high compression piston, would i need to get it honed and replated or is that not necessary due to the plating?

[DirtDevilBT]

It depends on the number of hours and what the plating looks like. Most of the time you just put the piston in with a little oil. The plating a hard stuff so unless you have 100+serious hours on it, you are probably good.

[450Rkid]

you cant just slide it in you have to have a ring compressor and engine assembly oil most auto parts stores have them in adjustable sizes just take the piston with you

[cals400ex]

why do you need a ring compressor for the 450r? i have built 400ex engines and 1 rancher and i have not used a ring compressor once. i always compress the rings with my hands. i am not saying it is easy but it can be done. well of course you should use assembly lube. :)

i know this is a highly debated topic but what do most consider safe for compression ratios on fresh 93 octane fuel?

[Hammer trx450r]

you don't NEED a ring compresser but it is nice. And i would definatly hone the cylinder with a bar hone

[cals400ex]

Originally posted by Hammer trx450r
you don't NEED a ring compresser but it is nice. And i would definatly hone the cylinder with a bar hone


i was told you shouldn't do this on the 450r like you do on many other bikes due to the nikasil plated cylinder?