stroker or long rod ??????

[250r morphidite]

hey guys i bought a bottom end from a guy had the top end suppose to be an 86 wiith a cool head but when i put it back togetther if i try to start it the piston will actually hit the head so i was told it must be a stroker crank or long rod how do i tell the difference so i can order the spacer from esr or does someone happen to have one? kind of in a jam on this one can anybody help thanks

[Jason Hall]

How far does the piston pop out of the cylinder when at Top Dead Center??

[1promodfan]

If your bottom end is an '87-'89 and you have a '86 cylinder then you need the spacer that goes under the cylinder. Does the cylinder have the "bridged" intake, or is it just open?

The reason I'm asking is my brother just had his cylinder ported and bored, and when he went to put it back together, his did the same thing. I told him that when they sent back his cylinder, they ordered the wrong piston. (His motor is a '87) Sure enough he had a '86 piston. I hope this helps you out.

Check out this site, it may help you out some too.

http://macdizzy.com/trx_specs.htm

[deathman53]

if you have a 87-89 bottom end, more than likely it has a long rod crank. You can go with a 87-89 piston or 85/86 piston and 4.5mm spacer plate. If you have a 85/86 cylinder, then you want a 85/86 piston, as the rings can get caught in the "open" intake. Many, like me, have 85 and 86 motors with 87-89 rods. You have to let us know exactly what you have, then we can tell you what your options are.

[250r morphidite]

i have an 86 cylinder and suppose to be 86 bottom end but maybe no i cant tell the diff for the bottom end piston sticks up about 4mm ish hard to measure rod says ha2 3 not sure if this helps or not my buddies piston from an 88 from wrist pin hole is about 4mm off when they are side by side thats all the specs i have for now thanks for all your help

[250r morphidite]

just used the chart on mac dizzy (thanks for the tip) the engine case number says its an 87 starting in 8000 series of number s guess i got and 87 so can i buy the spacer plate and go from there ????????

[1promodfan]

Originally posted by 250r morphidite
just used the chart on mac dizzy (thanks for the tip) the engine case number says its an 87 starting in 8000 series of number s guess i got and 87 so can i buy the spacer plate and go from there ????????

Yes, if you have a '87 bottom end and a '86 cylinder, then you need a spacer. Just be sure to buy a '86 piston as well........as the pin location is different. I believe everything I've said is right. If not, someone feel free to correct me.