trx 89 case with 85 atc jug need help

[rea]

Hey i have a stock 89 lower case stock rod and crank.I bought a jug for it off e-bay that turned out to be an 85-I assume its from an atc?they are for the most part the same the intake port in the center of the cylinder is a different shape.Any way now im not sure what piston i need.Does any one know??

[86 Quad R]

two options:

1. run an 85-86 piston with a spacer plate.

2. run an 87-89 piston no spacer plate.

[rea]

thanx you dont even know how much i appreciate the help

[deathman53]

you can use any piston, 85/86 with a spacer plate or 87-89 piston without a spacer plate. 85-89 jugs are interchangeable. I use 86 pistons on a 87-89 rod and I have to use a spacer plate.