66mm stoke for a 2v gs1000?

[nickp]

Is it possible to up the stroke on a gs1000 to 66mm using parts from either the gs1100 16v or the gs1100g??

[BadBillyB]

To answer your question, yes it is possible to modify an 1100 crank to fit into the GS1000 2V motor. It is expensive and requires case modifications. Back when I was drag racing, I had two of these break and the damage was bad. The biggest "off the shelf" high compression pistons available at the time were 1238cc and I wanted more....They were both built by Falicon, and only lasted a few races.....The hot set up is to use the 1000 crank with 1100 rods as they are longer and stronger, especially around the wrist pin area.....How big is your current motor ?????.......Billy

[ozman]

Is it possible to up the stroke on a gs1000 to 66mm using parts from either the gs1100 16v or the gs1100g??

my XR69 replica uses the 16v gs1100 crank, primary gear has to be moved on the crank to line up with clutch in the gs1000
this requires no case modifications
ozman

[nickp]

hi ozman,nice looking xr69..is it one of john sims frames? i will look at that tomorrow,got a few spares here to be able to compare.so the gear is spaced out from the web?

[nickp]

hi badbillyb....i have a 1176 original early 80's psb motor,but want to do a full 1325 this year,so need the extra stroke. what did falicon modify? i always ran falicon cranks when i was racing prostock seriously,never had a problem then. i hear they are not so hot nowadays though.

[ozman]

hi ozman,nice looking xr69..is it one of john sims frames? i will look at that tomorrow,got a few spares here to be able to compare.so the gear is spaced out from the web?

roger upperton in the uk modded the crank, from memory the web is machined to move the gear closer to the web

yes its a simms frame

ozman

[Starion007]

Ozman, that a great looking bike, I am curious if you had to modify the cam chain guides and slider? I read that cam chain control was a real problem for the super bikes of the day that Yoshimura built.

Thanks, Mark

[ozman]

Ozman, that a great looking bike, I am curious if you had to modify the cam chain guides and slider? I read that cam chain control was a real problem for the super bikes of the day that Yoshimura built.

Thanks, Mark

running ape manual tensioner and standard guides decided not to fit the extra roller under cam cover yoshi style as most of the reason yoshi did it was because of cam chains stretching in the longer endurance races this bikes only for sprint races 4 to 6 laps mostly

ozman

[nickp]

ozman,thanks for that,spoke to roger today..getting it sorted. i sell john a lot of the components he uses in the motors he builds. if you are ever stuck for anything pm me. cheers nick