Octane Help!

[Premierpower]

I am for the most part new to the Water World. I raced competitive amateur motocross for 6-7 years. June of 09 i purchased a pre owned "95" Kawa 550sx. Rode it every day for three months and blew the top end.

Immediately following I decided to upgrade and purchased a pre-owned “07” stock SX-R 800.

I am so addicted to the sport and my ski that I might take it over board, but I have a few questions that I would like to get answered.

I ride my SX-R almost everyday on an average of two hours a day or every other day. When I ride I ride the ski hard. I mean really hard, I have the throttle open for a good amount of time and It feels like I am raping the machine. I jump occasionally and have gone to the surf a few times. The original owner visited the surf often (based on a visual of the carb). I rest in between ride sessions but am back on it. When it comes to any motorsports I am all over it at an advanced level. I am not trying to brag, but deliver the information to receive good feedback.

I have between 185-190 PSI in each cylinder and it concerns me that it is high. I am using 93 octane and a 40:1 oil ratio.

Are these skis made to be stressed to almost max? Do I need to let it rest at times? What can I do to prevent catastrophes?

 

[Sospikey]

If it is stock; run it like you would run a stock MX bike. Like you stole it. Make sure you let it warm up before going WFO. Run on the premix you have been running, should be just OK.
If it is modified; depending on what mods you have , some precations might be in place. Normally if you run very high compression but don't use total loss programmable ignition, extended WOT should be avoided. I am not sure what compression the sxr runs at in stock form, I would think you have a milled or aftermarked head on yours. Normally you don't WOT on a stand-up for ages.

 

[SuperJETT]

How can you tell from looking at the carb it was ridden in surf often?

 

[OCD Solutions]

Stock Compression on the SXR's is much higher than anything else. The manual says that useable compression is between 129 and 199psi. I know mine had 185psi right from the factory.