ProSimex
XS650 Addict
How big has anyone here made their engine? How did you do it? Ive been curious about this.
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DirtyErnie
Renaissance Hick
Pretty rare to see a stroker. Full-custom cranks are more than most can manage.
I think the biggest I've seen here is an 860cc overbore with some creative piston and sleeve work. Don't know if the heads can keep up with that kind of displacement on the top end, but I bet the torque is fun.
I think the biggest I've seen here is an 860cc overbore with some creative piston and sleeve work. Don't know if the heads can keep up with that kind of displacement on the top end, but I bet the torque is fun.
irristeve
Grow old disgracfully
you can get them out to close to a 1000cc I belive, can get 840 kits(85mm bore)here in oz big problem with stroking is that you have to lift the barells up witch makes it tricky getting into std frame,check out aussie club site click on Geffs turbo
hi guys i met a guy at scorsby swap met in melbourne australia a few years ago and he had a xs650 when i went over /started talking he said its a 1000cc ,,, and the trick was a spacer under the barrells which was the pitch of the cam chain and monster bore etct... you have to bore the trans as well to fit it all in correctly regards oldbiker
ProSimex
XS650 Addict
Wild! Thanks for the input guys!
1000cc XS's Scroll down to the bottem of the page, if you contacted some of these guys they would gladly help you.
DirtyErnie
Renaissance Hick
Leave it to the Aussies...
Nice Work!
Nice Work!
I went to buy a chopper from a guy.
Original engine was a non-runner since the cam guide had given up and plastic and metal shavings was all over the engine, he didn't have time to fix it. But I would get a complete spare engine with it that was laying on the side.
He said the spare probably was tuned to 700cc. I liked the deal and bought it all.
Back home I fitted the spare enigne, ran like hell. But the kickstart gear was busted and no electric starter, so I put it in the corner of the garage and rebuilt the original engine instead, runs good now.
Later i, via an ad for xs650 spares got hold of the guy who sold him that 700cc-spare engine (I told him that i just bought a xs from a guy in the same town and from there we figured it out). Anyway, the "PO's PO" told me it was a 750cc but not built by him, oh no it was "built by an old Swedish legend engine builder..."
Oboy oboy i thought, so i removed the top on the spare engine: Tadaa!
It was bored to 87mm with original stroke. Thats a 880cc.
Now all I need is time... it will go on my tracker someday.
/Patrik
Original engine was a non-runner since the cam guide had given up and plastic and metal shavings was all over the engine, he didn't have time to fix it. But I would get a complete spare engine with it that was laying on the side.
He said the spare probably was tuned to 700cc. I liked the deal and bought it all.
Back home I fitted the spare enigne, ran like hell. But the kickstart gear was busted and no electric starter, so I put it in the corner of the garage and rebuilt the original engine instead, runs good now.
Later i, via an ad for xs650 spares got hold of the guy who sold him that 700cc-spare engine (I told him that i just bought a xs from a guy in the same town and from there we figured it out). Anyway, the "PO's PO" told me it was a 750cc but not built by him, oh no it was "built by an old Swedish legend engine builder..."
Oboy oboy i thought, so i removed the top on the spare engine: Tadaa!
It was bored to 87mm with original stroke. Thats a 880cc.
Now all I need is time... it will go on my tracker someday.
/Patrik
ProSimex
XS650 Addict
Cool story man, good thing you held onto it! Im not looking to do much in the way of displacement increase, maby a mikes 750 kit if any. Mostly looking for neat stories and such.
howardsmed
Ragged trousered Philanthropist
We are doing a 1000c now, and by juggling all the various rod xs650 lengths and piston deck hieghts, you can build it stock hieght
it is 277 rephased, the crank work was done by a firm who do high end work for Williams the F1 team
We are using Heiden big fin cylinders as there is no air-way to break into when you use cylinder liners suitable for 87mm pistons, ductile iron liners and custom 87mm wiseco pistons
A Smedspeed 3.5 cam etc etc
it is 277 rephased, the crank work was done by a firm who do high end work for Williams the F1 team
We are using Heiden big fin cylinders as there is no air-way to break into when you use cylinder liners suitable for 87mm pistons, ductile iron liners and custom 87mm wiseco pistons
A Smedspeed 3.5 cam etc etc
howardsmed
Ragged trousered Philanthropist
No, we hav'nt taken any. i think i had one of the crank after it was welded. But who knows where that is
We sat with a calculator and paper and worked out the deck hieght could be standard, so no issues with cam chain length
just this evening Rick and I were discussing what cam to use.
we settled on Smedspeed 3.5 which is short duration polydyne version of a Megacycle cam, which in turn was a copy of a Norris cam
I will ask Rick to post some pics
We sat with a calculator and paper and worked out the deck hieght could be standard, so no issues with cam chain length
just this evening Rick and I were discussing what cam to use.
we settled on Smedspeed 3.5 which is short duration polydyne version of a Megacycle cam, which in turn was a copy of a Norris cam
I will ask Rick to post some pics
