Anybody know anything about this? What would that figure out to be in cc's, 700, 680?? Does overboring a DS motor involve anything special, or is it basically the same process as any other motor? Could a local shop easily handle the job? What kind of hp improvement could I expect? Is it worth the $$ and effort? I plan on adding cams too. How do the cams come out? Could I change them at a later date without taking everything back apart again, or would it be well worth it to do it all at once??
I ask, because I'm wanting to hop-up my DS, but I don't want to get in way over my head. I'm also on a small budget and don't want to throw money away with expensive mods that don't do much. I know that the complete kits from Knutz or Ron Wood would be a better way to go. But those are more $$ than I have to spend. Anybody have any info that could help me out??

 

does CT have a head gasket for their piston yet?
the ds has a aluminium cylinder coated w/nikasil, you would have to be pretty lucky to find a local shop that had the ability to re-nikasil after they bore out your cylinder. The next issue that brings up is how reliable is your cylinder now that you've shaved 2 1/2mm off the wall thickness, it doesn't start out real thick to begin with. Pami's big bore 760 uses an aftermarket cylinder with thicker walls- I've heard of one individual that is running the 105 piston in their bike with the stock cylinder - can't remember who it is or what they did to make it work.

 

your displacement would be about 727cc's

 

Your Displacement would be 719.7cc up from 652.7cc.

Easy way to find Displacement for ATVs is Bore x Bore x Stroke x .003146 then for a single cylinder divide by 4 & for Twin cylinder divide by 2. Also if it is a 4-cylinder engine then u dont divide at all.

 

I stand corrected, I was thinking it was an 84mm stroke not an 83mm stroke. 719 cc is correct.
there is a company in Wis. that quoted me $185 +s&h to bore and nikasil the cylinder. Add the cost of the piston, head gasket and base gasket and that's about all the hard cost involved if you're doing the work yourself. Cams can be added any time with out having to remove the head off the bike again.

 

Major, would you happen to have the number of that place out in Wis. this doesn't seem like a bad idea compared to the cost of the 703 and 760.

 

<< I've heard of one individual that is running the 105 piston in their bike with the stock cylinder - can't remember who it is or what they did to make it work. >>




I believe that it is 'Badassbomb' that is running that setup. You might want to PM him and ask him about it.

 

Hmmm, I didn't know about the nikasil coating. I may see if my dealer knows of anywhere this can be done at. With some of the horror stories I've heard, about people who've sent their engines off; I wanted to avoid adding my name to the &quot;Where's my motor?&quot; list by having the work done within driving distance. I'll probably just have to leave the cylinder alone, and get my hp some other way. With that said, I'm glad to hear that the cams come out without removing the head. I'll look into what grinds are available, and go from there. Thanks for the info...

 

the company I talked to is called Millenium Technologies and their number is 920-893-5595, if you end up doing anything let us all know how it goes.

 

It was Badassbomb..that had the 720cc kit with just the 105mm bore(no stroke)he also has had problems sealing the head gasket[img]i/expressions/face-icon-small-sad.gif[/img]
It takes a sleeve to do the 105mm bore(on the stock cylinder)..also I think the cases would have to be bored too.

jeff