Gains from a 10:1 piston over the stock 9:2:1 piston and stage2 cam

I am just wondering if I would see much improvement if I went with a little high compression piston vs my stock 9:2:1 piston like maybe a 10:1 JE piston?? I know my buddy went with a 11:1 in his and found out that he is going to likely have to mix fuel for how he wants to ride and I know I dont want to mess any of that. I am fixing to pull the trigger on a Stage2 cam and Bazzaz fuel controler from James and I am just trying to see if it would be a good time/worth it to up compression a little. I know with cam I will need fuel controler and if I just did 10:1 piston alone I shouldnt need fuel controler but curious if I would gain much by doing both or if cam is enough for now.

the aftermarket piston is a lot better quality too

Got my wheels turning now I figured why else would the 2014 Grizzly and Viking now be 10:1 pistons!

Wonder if the Viking head and piston will work in my 2012 700 I could have a crossbread like an oldsmobuick..  maybe call it a Vikino....

i think the head is the same...but not for sure

WV Hot Rod Rhino wrote:

i think the head is the same...but not for sure

 did the dealer give you a delivery date yet? they're supposed to be "out" in August.

yamahammer's sales materials talk about a revised intake tract and airbox along with 4 valves per head.

08Rhino450SE wrote:

WV Hot Rod Rhino wrote:

i think the head is the same...but not for sure

 did the dealer give you a delivery date yet? they're supposed to be "out" in August.

yamahammer's sales materials talk about a revised intake tract and airbox along with 4 valves per head.

 My local dealer is suposed to have his first one before month end and several more in August so he said and he is Pro Yamaha dealer so I would suspect they get things a little quicker.

thePayne wrote:

 My local dealer is suposed to have his first one before month end and several more in August so he said and he is Pro Yamaha dealer so I would suspect they get things a little quicker.

not sure about your model year, but a 2008 700 only puts out 64 psi of static compression.
my 08 fo-fitty puts out 180.6 psi.
sounds like there's a lot of vroom left in them heads. does your dealer know anybody that does head work in your area?

Go ahead and get that big bad head that's setting there on the shelf at JBS to go with that piston and cam.  You know you want it.

I would say the added compression would help a bit along with the cam.

x2!!!

Hump wrote:

Go ahead and get that big bad head that's setting there on the shelf at JBS to go with that piston and cam.  You know you want it.

I would say the added compression would help a bit along with the cam.

and only a phone call away. a definite improvement for the butt dyno!

Hump wrote:

Go ahead and get that big bad head that's setting there on the shelf at JBS to go with that piston and cam.  You know you want it.

I would say the added compression would help a bit along with the cam.

 I agree. I saw those beautiful machined heads online, and it was just a matter of time before I was calling James and Nikki with my credit card in my hand giggling like a school girl. The head makes a big difference. As other guys on here are suggesting, there is a lot to be had in the head of the 700 motor. I can personally attest to that as the head was the last thing I did, and I did all my motor work in stages. It's expensive, but it is one of those things that makes a good running motor run excellent.

My curiosity is peaked at how well a stock bore Rhino 700 would run with an 11:1 piston, ported head but stock size (or +1) valves, a mild cam like the Raptor stage 1, throttle body, and JBS sheave. I'm guessing that even with stock exhaust it would run real good, especially for mud or tight trails. The stock exhaust would probably choke it up pretty good at faster speeds, though. Just thinking out loud here...

As to the compression, my experience has been a little different but my circumstances are also a little different. I have not had one bit of problem with the 11:1 CP piston in my build. I experience no detonation. However, I have the 734cc (105.5mm) cylinder and not the stock 686 (102mm) cylinder. I have run 11:1 with the stock head and now with the ported head JBS sells. In my humble opinion, I think the detonation is closely linked to timing advance. I make sure that there is no additional timing added to the ignition above 5000RPM and actually pull a couple degrees of timing as the motor winds out to redline. This is all running 93 octane pump gas at sea level. Your results may vary.

Well I have made my mind up that I am just going to do a stage2 cam and bazzaz fuel controler for now since I'll need them no matter what and then once hunting season is over and before spring if I can wait that long I am going to a JE 11:1 piston and then add the bazzaz AFM to my fuel controler. That sounds like the only right thing to do other than do it all now!!! I also will do some head work when time for piston but that may only involve some cleanup work and not a port job.

mine is 11-1 and i had to run 87 all weekend...it was all they had where we was

another thing to remember about a cam is that (depending on valve timing) it effectively reduces "mechanical compression." a longer overlap will give a lower "corrected compression," allowing you to run on pump gas.  
only doing the cam will reduce your corrected compression to a point where your engine won't have as much pep as it does now, and could actually feel "lazier"
decking the head would give you more compression for relatively low cost. that's why i asked about the dealer in your area. "for experienced mill operators only."
that's why buying off the shelf heads and/or cylinders might be a better option...

James what kind of timing did you have to run to be able to run 87 octane.  I can only find 91 octane here and I can't even run the stock extended DynaFS +4 timing without it popping like crazy.  I am currently mixing 2 gallons of U4.4 103 octane with 3 gallons of 91 octane to get me to 95.8 octane and I can throw all the timing I want at it now.  If I pull out enough timing to run the 91 my Rhino feels like a giant turd, but that may be due to how it runs right now with the 96 octane tune.  I know in my little test drag strip I added 5mph to the run and my 0-61 I can cover in a third of the distance I could before my upgrades.

Oh, and Rodney I would give my normal answer of quit messing with the Rhino and get a Commander but after being all up in a Maverick's business last night I am backing off of that.  I was really impressed with the all stock RZR XP 900's last night.  I also thought it was funny that every one of them had to have blowers on their cvt's and the heats were only 4 to 5 minutes long.

Curious now if I just upped compression with a 11:1 piston and kept factory cam and ran a little better fuel I bet it would run alot different. I currently am stock cam and I dont ever hit rev limiter at 53-54mph just seem to run out of power. Thats why I been weighing cam/fuel controler vs just high compression piston which is all about the same price wise.