crank?

mgtkr1 · Post by **mgtkr1** » Sat Jan 12, 2008 5:17 pm

im building a 'fast' (second) motor purely for the fun of it and as i have a crank of unkown age lying around this will be a good place to start, rebuild it. i need to know which rods (part number) can be used as a alternative to kr1/s rods which i think a now nla. i seem to remember that kx rods could be used or could of been kdx? i have a crank guy who rebuilds yamaha cranks(parralel tz's are critical that there bang on as it increases power and life when there right) so im sorted there. were are seals/mains/big end etc sourced for best price/availability? i only want genuine parts were possible. sep did the crank in my motor that is in the bike now, pleased with there work btw. thanks in advance.

mj43 · Post by **mj43** » Sat Jan 12, 2008 5:48 pm

Matt

The main bearings are Koyo http://www.koyoseiko.com/

They are numbered 83A916C 3off and 6305N 1 off (this is the drive gear bearing)

Seals are
FJW 56 25 62 8 drive gear side
FWJ 56 25 55 10 centre seals
FWJ 52 25 50 10 Genny side

They are by ARS (Arai) http://www.arai-net.com/english/company/history.html

no idea where best to source them - I suggest giving PJ Engineering a call.

mgtkr1 · Post by **mgtkr1** » Sun Jan 13, 2008 1:42 am

many thanks. about the head, would it be more convenient for you if we met at a meeting at the beggining of the season?