wall-to-piston clearance

[sneaky11]

Hi! Just got a CP 12.5:1 87mm piston for my 400ex... it have a sheet with the honing roughness step-thru... but i didn't see anything about the wall-to-piston clearance...

My rebuilt is on neutral, if someone know what's the spec on that clearance for that kind of piston??? .003?? .004?

thx

[sneaky11]

up

[sneaky11]

finally got my answer from cp-carillo... I'm a bit surprise

clearance : 0.0025
Heavy Duty Head Stud: Not required
Octane: 93 or greater

:eek:

[kfx400rider03]

is this the same are piston ring gap?

[sneaky11]

Nope!! this is the piston to cylinder clearance

the ring gap is calculated by :

top ring
bore size X 0.0045

2nd ring is .004 more than top

oil ring is .015 minimum