moto questions.. crank choice and how they seize

[woodsracer144]

first off... on a 86 motor if i use a 87 later cyl i need a base plate right?

second... what are the list of ways a 2 stroke seizes? i've herd of a 4 point i think... any one have any pics to show it? thanks

[atv fan 28]

nope you use a base plate when running a long rod with a 86 style piston.

[86 Quad R]

Originally posted by atv fan 28
nope you use a base plate when running a long rod with a 86 style piston.

correct..... and when using a stroker crank.

there are several ways of seizier.... 4 corner cold seize, overheat seize, lean, detonation.... ect ect. if you'll do a search you should turn up plenty of pics. :cool:

[atv fan 28]

i read somewhere that you could use a 3mm spacer plate and run a 86 yz 250 piston.

[woodsracer144]

i think i have a 5 mm spacer plate! hope this works out.. main reason i ask is i found a 86 motor and it needs a piston. i have a good piston and cyl and i had a base plate with a hot rods crank shaft... it was a 88 89 cyl... if things pan out like i would like all i would need is a clutch kit... fibers and steels...

[atv fan 28]

Originally posted by woodsracer144
i think i have a 5 mm spacer plate! hope this works out.. main reason i ask is i found a 86 motor and it needs a piston. i have a good piston and cyl and i had a base plate with a hot rods crank shaft... it was a 88 89 cyl... if things pan out like i would like all i would need is a clutch kit... fibers and steels... i dont think you can use a 5mm base plate with a 86 short rod motor no matter what cylinder you use!

[woodsracer144]

stroker with the short cyl? i thought it was a 5... or a 4

[atv fan 28]

Originally posted by woodsracer144
stroker with the short cyl? i thought it was a 5... or a 4 all the cylinders have the same deck height!

[woodsracer144]

ok but isnt one crank long then the other?

[312R1]

Originally posted by woodsracer144
ok but isnt one crank long then the other?


Yes 86 is a short rod and 87-89 is a long rod.

[atv fan 28]

maybe this vid will help you woodsracer. http://www.youtube.com/watch?v=l3kYLJajA2o

[MossboysRacing]

if you are running a 85-86 bottom end, with a long rod (87-89) crank, you need an 85-86 cylinder and piston with 5mm spacer plate. (my current set-up)

If you use a 85-86 bottom end with a long rod crank, you can use
an 87-89 piston with an 87-89 cylinder. (no spacer plate)

Or keep it all 85-86. short crank, 85-86 piston, 85-86 cylinder

[atv fan 28]

Originally posted by MossboysRacing
if you are running a 85-86 bottom end, with a long rod (87-89) crank, you need an 85-86 cylinder and piston with 5mm spacer plate. (my current set-up)

If you use a 85-86 bottom end with a long rod crank, you can use
an 87-89 piston with an 87-89 cylinder. (no spacer plate)

Or keep it all 85-86. short crank, 85-86 piston, 85-86 cylinder you can use a 86-89 cylinder on any trx no matter if its a short rod or long rod motor

[woodsracer144]

thanks moss! i think i would have OEM 86 bottom end.... i have the 88 cyl and a 5 mm base plate with a stock bore piston... i'll get a pic of the piston so i know what year or kind it is....

thanks!

[C41Xracer]

Originally posted by atv fan 28
i read somewhere that you could use a 3mm spacer plate and run a 86 yz 250 piston.

i ran a yz250 piston im my 89 with a 4mm stroker and a 4mm spacer plate