Austin

I have a 1990 650 yamaha superjet i feel its alittle under power not enough acceleration and speed any ideas that i could do cheap.
thanks

fox river pwc

Mill the head and lighten the flywheel. Try to find a pipe. Get a good prop.

However, most guys will tell you to save your money and get a 701 ASAP - but the lightened flywheel can go right on to the 701 anyhow, and so can most pipes.

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Austin

thanks anyone have any other ideas

bkoche

Rideplate and intake grate. Dual carbs

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2004 SXR - FPP Wetpipe, Blowsion railcaps, 4deg bars, billet clamps
1994 750sx - Loaded -FOR SALE
1983 JS550 - WC RC520 reed cylinder, WC Head, PJS WB, Dual 38SBNs, WC 750 reed stuffers, WC Stacks, WC 6.5gal tank, FPP Halfpipe, SBT High torque starter, 16.5 Skat, Blueprinted 440 pump, lightened driveshaft, 76mm OP nozzle, Jetsport bulkhead brace, 90wt mod, WC scoop, Rend plate, Rear exhaust, Carbon Fiber

1991 Honda CB750
1976 Suzuki RE5A
1976 Suzuki GT750A
1975 Suzuki GT550M

BombThreat

Mill the head and find a pipe

Boris

Mill the head, lighten the stock flywheel, remove the rev limiter from the stock CDI, advance the timing, skim the intake manifold, get a good prop, get a scoop intake grate, find a pipe.

That will make that 650 run better than many 701's.

chriselmore_1

i had a piped proped 650 w/ a head and cdi that ripped hard! harder than a stock 61x for sure

Austin

alright i will try some of those things thanks

spdwrx701

back in the day I had a 650 sj with milled head, riva red pipe, k&N filter, Carbon reed petals and a stainless prop and it was faster than my stock 2000 twin carb sj when i bought it brand new.... Add an MSD Enhancer and it comes alive even more, also lightening the flywheel is a great compliment to these other mods

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Austin

ok i am definitely going to try some of these thanks