Does anyone still make the 102 piston for the DS. if so what CR's are available is anyone running them is there a benefit to it? Thanks for your time[img]i/expressions/face-icon-small-smile.gif[/img] Tim

 

I think most of those are in stroked bikes now and they are 703's

The 703 is a very strong bike but, if you don't want to split the cases, the 730 will get you more power than the 680 (102mm bore) will.

You can have a number of people bore your jug then re-coat it to 102mm. The Bom can get you a piston for this set-up and probably get you set-up on the bore.

The 680 doesn't have the power of a 730 (of similar build - i.e. cams, CR, carbs, head work - all being the same.) But, a 680 should be much less expensive to build.

Check out Pami's site for info on the 680.

 

does that use the stock head gasket?

 

don't see the stock head gasket being of any use in those set-ups

 

I used an all metal (apply Gasgascinch to both sides) when I ran that set-up.