Q
QuaiChangKane
Guest
Just got a set of GS700 pistons/rods off of eBay. They're in good shape, with a bit of cleaning to do, and one's got some scuffs from sitting on a shelf, but very useable overall.
I've heard that a bit of power can be had from using the 700 pistons (taller pistons, higher compression) and 1100 cams (greater lift, duration) in a 750ES motor.
I need to know specifically which years 1100 (or 1150?) cams work best, and also if the 700 cams will yield more power (not just more, but useable). From an article I read, Suzuki changed the cam profile and timing for the 700E to match the power output from the 750 to deal with the smaller displacement.
Is it enough to make a noticeable difference?
Basically, I'm not looking for anything too dramatic - just to wake up an otherwise solid motor. Just thinking about having the jugs measured and overbored (only if necessary), re-ringed, valves checked and cleaned, seats cleaned up, intake ports smoothed out (factory cast marks and intake boot mating are hideous - it's a wonder this thing made any power at all!), new valve springs, and other misc. minor things.
The motor's out right now for gear replacement (dogs on second worn out), and I'll be running a spare, so there's no rush to get the job done. I've got newer gears (less than 8K on the gears), and a NOS clutch basket that I'll have the rivets welded on (and balanced).
I've also got a set of 34mm flatslides and K&N pods, with a Kerker, Yosh, and 'Trapp pipe that I'll find the best combo from. I'm going with an Ohlins shock, new fork springs (don't know which brand yet), SS lines (anti-dive block off), HH pads, fork brace, and acquired some NOS LP 37mm preload adjusters for the forks.
Basically, it's going to remain mostly stock (aesthetically and functionally), with exception to the clip-ons, reshaped seat, pipe, and fairing lowers. I'd like to make an era-correct hot rod, but don't want to spend the rest of my life sourcing parts.
I'm upgrading the stock suspension and stock brakes as much as possible, with the exception being an aftermarket rear shock (hardly visible, though). I'll likely upgrade the ignition and electrics in the process.
My ideal is to get closer to 100 hp from the motor, up from the factory claimed 86. I'd be happy with a true 90 rwhp, but would like more (but don't want to sacrifice rideability).
These are my goals - not too lofty, methinks. I'm not looking to "smoke some 600's", as this bike's day was more than 20 years ago. I've got more than one bike, so this doesn't have to be the end-all for me.
Just looking for some advice on which cams to use, and other places to look for power "tweaks" without sacrificing too much or drastically modifying power delivery.
Thanks,
-Q!
I've heard that a bit of power can be had from using the 700 pistons (taller pistons, higher compression) and 1100 cams (greater lift, duration) in a 750ES motor.
I need to know specifically which years 1100 (or 1150?) cams work best, and also if the 700 cams will yield more power (not just more, but useable). From an article I read, Suzuki changed the cam profile and timing for the 700E to match the power output from the 750 to deal with the smaller displacement.
Is it enough to make a noticeable difference?
Basically, I'm not looking for anything too dramatic - just to wake up an otherwise solid motor. Just thinking about having the jugs measured and overbored (only if necessary), re-ringed, valves checked and cleaned, seats cleaned up, intake ports smoothed out (factory cast marks and intake boot mating are hideous - it's a wonder this thing made any power at all!), new valve springs, and other misc. minor things.
The motor's out right now for gear replacement (dogs on second worn out), and I'll be running a spare, so there's no rush to get the job done. I've got newer gears (less than 8K on the gears), and a NOS clutch basket that I'll have the rivets welded on (and balanced).
I've also got a set of 34mm flatslides and K&N pods, with a Kerker, Yosh, and 'Trapp pipe that I'll find the best combo from. I'm going with an Ohlins shock, new fork springs (don't know which brand yet), SS lines (anti-dive block off), HH pads, fork brace, and acquired some NOS LP 37mm preload adjusters for the forks.
Basically, it's going to remain mostly stock (aesthetically and functionally), with exception to the clip-ons, reshaped seat, pipe, and fairing lowers. I'd like to make an era-correct hot rod, but don't want to spend the rest of my life sourcing parts.
I'm upgrading the stock suspension and stock brakes as much as possible, with the exception being an aftermarket rear shock (hardly visible, though). I'll likely upgrade the ignition and electrics in the process.
My ideal is to get closer to 100 hp from the motor, up from the factory claimed 86. I'd be happy with a true 90 rwhp, but would like more (but don't want to sacrifice rideability).
These are my goals - not too lofty, methinks. I'm not looking to "smoke some 600's", as this bike's day was more than 20 years ago. I've got more than one bike, so this doesn't have to be the end-all for me.
Just looking for some advice on which cams to use, and other places to look for power "tweaks" without sacrificing too much or drastically modifying power delivery.
Thanks,
-Q!
Last edited:
