got-wood
New member
Buddy rebuilt his 97 600 XT and he mentioned there was a lot of different piston choices and that some were for higher performance versions. I thought they were all about the same, is there a BEST 600? What year and model should I be looking for, if any? Is it correct that these engines are in the 90 hp range stock? Thanks.
1998 if I had to pick. 1997 is the same engine just had piston problems with the originals. I also heard 90 ish horsepower.
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I was wondering the same question about the 94-96 600s. Is there a preferred and is there one to stay away from.
Stock Vmax 600: 96.4 hp @ 7750 & 65.8 ft lbs tq @ 7500
Stock Vmax 600: 96.4 hp @ 7750 & 65.8 ft lbs tq @ 7500
Yamaha Nutz
New member
Right now for oem Pistons there is just one updated # the 98 8CR forged piston while the 97-99 motor has a better design with triple exhaust ports the intake is way smaller that the 94-96 cylinder 95 600 made 94.5 hp at 7250 rpm I have a fl tilt 95 motor with Aaen twins taper bored carbs and digital RPC ignition makes just under 140 hp at 8450 rpms not bad for a old 600
03viperguy
Moderator
on a side note, thats some damn decent power on an old 600 Yamaha Nutz!
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So if you were to pick OE Yamaha pistons, 98 CRs are the way to go?
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got-wood
New member
Wow! What's that in Mike? Thanks for the data.
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I copied it and saved it to my phone one day while I was surfing.
Stock Vmax 600: 96.4 hp @ 7750 & 65.8 ft lbs tq @ 7500
Aaen Single: 99.4 hp @ 7500 & 69.6 ft lbs tq @ 7500
Yamaha GYT Single: 97.9 hp @ 8000 & 66.2 ft lbs tq @ 7500
SLP Twins: 108.8 hp @ 7750 & 73.2 ft lbs tq @ 7750
PSI Twins: 107.1 hp @ 8250 & 68.6 ft lbs tq @ 8000
RPC Twins: 106.7 hp @ 8250 & 67.9 ft lbs tq @ 8250
Bender Twins: 108.3 @ 7750 & 73.4 ft lbs tq @ 7750
It should be noted that Dynotech also measured and compared the Bender & SLP twins and they came out with exact same pipe measurements and the results netted dang near the same HP & TQ readings.
Turbo Vmax 600 7 psi: 131.3 hp @ 7750 & 90.5 ft lbs tq @ 7500
Turbo Vmax 600 9 psi: 141.7 hp @ 7500 & 99.2 ft lbs tq @ 7500
Turbo Vmax 600 11 psi: 151.4 hp @ 7500 & 106.3 ft lbs tq @ 7250
Turbo Vmax 600 12.5 psi: 162.3 hp @ 7900 & 109.3 ft lbs tq @ 7700
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Looking for a piston to wall, go/no-go measurement.
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Bump.
yamahamark
Member
97 pistons had a problem with ring spin and usually scared the cylinder but that was corrected in 98..