School me on the 600 twins.

got-wood

got-wood

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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.
 
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
 
Yamaha Nutz said:
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
Click to expand...
So if you were to pick OE Yamaha pistons, 98 CRs are the way to go?
 
Last edited:
got-wood said:
Wow! What's that in Mike? Thanks for the data.
Click to expand...
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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