Well I went and installed a 11 to 1 wisco +1mm in my 660 rhino and now it's a 672, it did nothing for me, I don't no why I even messed with it.
I tried rejetting but it runs best with the 155 dynojet, I have a rais tube duners kit, stock air filter, I even built a bed delete and it's still seems to have less power than it did stock. I might try a cam next but I didn't want to get to far from stock. Any ideas!!!

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I NEED A BEER !!

There is something else wrong, the extra compression should give you more power through the whole RPM band...Double check your cam timing, valve lash...ir just seems strange to up the compression and it not help.

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Arrrrrrrrrr we dunin yet
K&N, ProComm CDI, Stainless Exhaust tip, KMS sheave, EPI Clutch kit, Lonestar MTS kit w/ Bilsteins, Gear-One axles, rack and billet goodies, B&A cage

I rechecked the cam timeing and valves and everything else I can think of.
The group of rhino's that I ride with at dumont are leveing me in the dust now.

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I NEED A BEER !!

...another thought..is the carb slide working? It is vacuum actuated, diagpragm bad...stuck..or possibly no full throttle on the mechanical side???food for thought

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Arrrrrrrrrr we dunin yet
K&N, ProComm CDI, Stainless Exhaust tip, KMS sheave, EPI Clutch kit, Lonestar MTS kit w/ Bilsteins, Gear-One axles, rack and billet goodies, B&A cage

you got no intake, it's all stock, you need some air and gas in that motor, and probably an exhaust. Open it up and let it breath, try a fcr or hsr carb and aftermarket filter,loose the raistube.

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I highly recommend Chris@BenchmarkPerformance.us
760-484-0986

I haven't thought about the diaghpram but I'm pretty shure it's fine, the thing runs just like it always has.

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I NEED A BEER !!

Well I'm trying to leve it as stock as possible, a better filter shuld help and I might try it. Maybe I'll take the HSR 42 off my harley and give it a try.

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I NEED A BEER !!

you can't get more power leaving the in and out stock, in order to get power, you need MORE air/fuel and you need to exhaust it faster.
that raistube and stock filter/box is restricting the amount of air you can get, which is why a small jet works the best for you.

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I highly recommend Chris@BenchmarkPerformance.us
760-484-0986

What exhaust are you running. You can't get any more power with the stock system, its way too small. Muzzy exhaust isn't much louder than stock and offers excellent gains.

I have added pistons to a 400ex and my 660, both another 26cc. You will not see anything without a exhaust,cam and intake. My 426 was night and day after valves and a p&p, now it's a dune bike lossing most low end. The rhino I did cam and a muzzy and the muzzy is your best gain, cam slightly increases. You will never be fast enough what ever you do or spend! Buy a muzzy and gain enough to be satisfied.

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06' 660SE custom 4 seat cage w/ CP686 11:1, web cam, muzzy exhaust, dynatek CDI, Venom winch, MTX audio

Max and Court are right.......your engine is a big air pump, the more air you can move through it the better it will perform!

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Yep- Without a cam all you are doing is squeezing what little air is getting in a little more. You said you wanted to keep it relatively stock, wouldn't doing a cam and not the piston been a wiser choice?

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If you voted for Obama to prove your not racist- Who are you going to vote for to prove your not an idiot?

Never going to see much difference with the stock exhaust...its the CORK...I did piston, cam, mild port work, FCR on mine recently..ran OK with stock exhaust...maybe a tad better throttle response and low end...finally installed the Muzzy, and its a different machine...not earth shattering by anymeans...but made the mods worthwhile.

pull the exhaust plug and add the k&n hard intake, that will make a very noticable difference

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Hey i got a question that is probably stupid but how do you measure what size the engine is with all the numbers like you said a 660 with 11:1 piston is a 672? so would a 700 with the same thing be a 712? and what makes a 720 or a 686?