you need a gauge to see if it leaks w/ the pressure on it for a period of time. too much air could blow the seals. i asked that same question a long time ago and got the same answer(but being yelled at by my mechanic friend lol)

 

could go up acouple of jet sizes and see how it runs ,if it gets to boggy like chokeing out then dropdown a size till it runs decent

 

i just talked to rick ritter and he recomended a 140 main and moveing the needle and run premeium gas

 

i forgot to mention i do have a air box snorkel, it was gone when i got the bike the whole eng was in a box disassembled, and i put it together... the first thing he asked me is it i had done anytghing to the air box... i did not thing much of it , i told him the snorkel was missing- aha to much air flow, needs more gas.. i will put a 140 main in tomorrow and give that a shot

 

let us kno how it works

 

you absolutely absolutely need a higher octane!!! they actually suggest running above 91 octane with these stock!

also you will need the 140 main due to the colder weather but if your a elevation greater than about 2000ft you shuold be able to run a 130

 

all my other 2-stroke toys are fine on 87 , its worh a shot.. i guess i understand the more fule for more air in is jetted to restricted air flow , now it dont..

 

tb sleeper is right running 93 octane is what is recomended, to check for a leak you can add pressure to the crankcase and spray a soapy water solution around all your seals. or you also can use wd-40 to spray around the seals to see if the engine revs up. Im thinking you need a little more fuel and air for the bigger piston. And also get the airbox as close to factory as possible. I like to ride in mud and water too but i leave mine factory because over the years working on polaris quads snorkels cause more problems than prevent.

 

stock setting i would think would be ok but worse case go up one jet size. what are you using for gas grade? shouldnt be more then 87. if you run higher that coukld cause pinning and excess heat as well. just a thought. probably wrong though.

running a higher octane doesn't effect the heat, if it is detonating, it would be better to run a higher one, because all the octane rating means is the resistance to detonation, the reason that high performance vehicles run higher octane fuel is to actually keep it cooler, because they are usually running a higher compression ratio and thats what causes more heat. i would adjust the clip on the jet needle before changing the jets, just take the top of the carburetor off and you'll see a needle going through the slide and just take the c - clip off and move it down the clip a notch