Will Cylinder And Heads Interchang

[gunslinger]

From the 86 to the 89 and vice-versa

[srfootball50]

im pretty sure they are inerchangable but you have to get a spacer plate i believe

[TheFontMaster]

Originally posted by srfootball50
im pretty sure they are inerchangable but you have to get a spacer plate i believe

Spacer plates are for when you use an 87-89 long rod with an 86 piston. The spacer plate doesn't have to do with the head.

[gunslinger]

so if i use a 86 or 87 rod i don't need the plate-the 88&89 rod is longer the cylinder is the same rite?

[TheFontMaster]

The 87-89 engines had the long rod, the 85/86 atc's and 86 trx's had the short rod. The 85/86 pistons are different fron the 87-89 pistons. You can only get the 87-89 pistons in an over bore up to .060 over, where as the 85/86 pistons you can get up to I belive .120 over. So people that want to get more live out of thier cylinder will put an 86 piston on thier 87-89 long rod motors, but if you do that then you need the spacer plate so the piston isn't hitting the head.

Ok back to the main topic.....

[gunslinger]

Got it :)
and thank you sir:D

[250R_4_ever]

all interchangable
as long as you dont mix up piston and crank, if you do you will need a spacer plate

[baker250r]

anybody ever tried runnin 86 rod with a 88 piston?

[wilkin250r]

Originally posted by baker250r
anybody ever tried runnin 86 rod with a 88 piston?

Even if it ran, it wouldn't have any power. You'd be looking at a 7:1 compression or less. A compression test would probably yield about 85psi.

However, even more important, I believe this combination would actually have the piston skirt hit the crank at BDC. It wouldn't run because you can't get a full revolution out of the crank.

[baker250r]

thats wut i thought... i jsut wondered if anybody had got the hair brain idea and tried it.

[gunslinger]

quote;The 85/86 pistons are different fron the 87-89 pistons.


Is it taller are what????????????????

[250R_4_ever]

I tried 87crank with 87 piston on a 86 cylinder and it was just fine

I wouldnt try running a 86 crank with the smaller 88 piston :huh