Any updates? Just wondering what cylinder you were able to use. I just got another drag ported 87 cylinder, thinking of selling it and going with a more trail-friendly setup.

 

I am waiting to get the cylinder back from the machine shop and start putting it back together. Wouldn't need a drag cylinder any way because I am a trail rider. Thanks though.

 

Hey nicname,
i would be interested in the drag cylinder......
and i also got several trail stlye cylinder in excellent shape......
let me know (macanic@charter.net)

 

How do you know if you have an 86 jug or an 88. would it be the bridge on the intake side. The bridge is the metal thing that goes down the middle of the intake right? ALso how do you know if you have an 89 long rod, or with what bottom end.. I have a spacer plate, and a 86 piston .50 bore. NOt sure on what bottom end I have though. It isuppose to be a 265 if that helps.

 

The easiest way to tell is the bridged intake port, like you already said. I am not sure how to tell if you have a long rod crank, but I would assume that since you are using a spacer you have a long rod crank.

 

I would think that you have the long rod if you are using the 86 piston with the spacer plate. The later (long rod) is 5mm longer. The early pistons have the pin lower on the skirt, while the later style have it moved 5mm higher. Yes, the easiest way to tell what cylinder you have is by the intake. 85-86 are open intake and the later have a vertical strip (bridge) in them.

 

So I could use a 88 cylinder, with my spacer plate, but have to use an 86 piston. COrrect? Could I use a 88 piston also, or is it to big and hit the head because of the 5mm. Or is the spacer plate covering the 5mm?? The reason for so many questions, I am looking into getting a new top end and I want to make sure. Thanks.

 

urcrazy, the piston on the 88-89 has the wrist pin location higher to make up the difference on the rod length. If you put the 86 crank in it your piston would fall way too short. Same applies the other way. If you put the 86 piston on the 88-89 crank then it would come out the top of the jug. That's why a spacer has to be used. It's not too hard when you set down and think about it for a minute[img]i/expressions/face-icon-small-happy.gif[/img]

 

All cylinders will interchange. Use the piston for the rod you have. Short Rod: use the 85-86 piston. Long Rod: use the 87-89 piston or an 85-86 with the spacer plate. The spacer plates increase crankcase volume, that's why some people use the long rod with an 85-86 piston and a spacer plate. There are many more variations (especially when discussing base gaskets) but those are the easiest and most common. Personally I would use an 88-89 cylinder with an 86 piston on a short rod.

 

Ok I got it now. I think I will be buying a 88 cylinder. so I can use either piston the 86 or 88 right? The 86 piston wont have a bad effect with the 88 cylinder, right, as long as I use the spacer plate? Or are the 86 pistons prone to crack? and just stay with the 88 piston and get rid of the spacer plate?[img]i/expressions/face-icon-small-confused.gif[/img]

I hope I am not being a du-mass on these things, just trying to make it right.