110 octane

[mrg21201]

I have recently rebuilt my 400 to a 416 11: 1 wiseco piston w/ hotcam stage 2. Was told higher octane will keep the motor cooler the only high octane gas i can find is 110 leaded. Is this safe to run?

[FoxRacing81]

That would be fine. It will make it run cooler, but in reality as long as you have air scoops,and run synthetic atv oil, you'll be fine using 93.

[F-16Guy]

Yeah, it's safe to run. You could probably mix it 50/50 with super and save some money. If you mix it, it will also cut down on lead deposits, which can foul your plug if they get too bad. Since I broke my 416 in, I have been able to run straight super unless I was going to really work it hard, like at the dunes or on the track.

[2004exrider]

they sell 11:1 so u can still run 93, so ull be fine

my 10.8:1 in a 416 ex with bigger oil tank ( if that is relevant) has spark knock when it gets hot and I ride it hard. I hate it.

this is with 93 octane. I am going to bump up my main jet to help I think.

[DaveEX7]

Don't use too high of an octane.... it will rob you of horsepower

If your local gas station carries it, try Ultra 94 octane.... works fine in my bike.

[jak1389]

does a spark knock hurt anything or is just annoying?

[plkmonster2]

It is not just annoying. If it is a contant problem, it can have serious effects. I just opened up a motor that have knocking issues. There where little bits of aluminum all over inside the combustion chamber. Each time it detonated, it shaved little pieced off the piston. Also, it can damage your crank becuase it fires before the piston is at tdc.

what he said. and it is anoying.

[jak1389]

o man:eek2: . i had no idea. i was going to run 93 octane in the 416. my dad is like just start it off at 87 and move it up from there until the knocking stops. so you dont waist money on the higher priced gas. now i can show him this new info just learned.:chinese:

the price diffrence in a 2 gallon or what ever it is tank is pretty small as long as it comes from the pump.

I ran 87 in my stock motor, never had a problem. you can run 87 in a 416 but it depends on the compresion ratio of the piston.

[jak1389]

the compression will be a je 10.8:1

[z435]

if u go over a 11:1 then u should run atleast 100 octane cause it will ping it happend to my dads harley with 10.8:1 and it runs great with the 100 octane.

[ridinredodb]

dont use anything lower than 91! 93 will work just fine and its not very expensive. i run 114 race gas at $5 a gallon

5$ a gallon isnt all that bad if you think about how much of it you use. and wether or not you have a job.

[speedy400]

Do remember guys.. if you have a buncha carbon deposit in your combustion chamber it will tweak your comp. ratio quite a bit. I run 91 in my 10.8 to 1 with out a problem, if you knockin' with my setup try running sea foam for awhile. That may help ya out.-darren

Oh yeah I was just thinking, wouldnt the grind of your cam change around the comp. also? because say you get a top end cam, you'r valve's will be open longer hence less compression at bottom??

[bwamos]

They only have 87 octane (Premium Pump) availiable around here in the KC, MO area.

It works fine as long as I'm in the woods. (never knocks). But if I ride in the hot dunes down in OK, then I have to run some higher octane. I'm running 2 FST Oil coolers in series on my 330ex (11:1) to keep it extra cool, though.

[bwamos]

Originally posted by speedy400
Oh yeah I was just thinking, wouldnt the grind of your cam change around the comp. also? because say you get a top end cam, you'r valve's will be open longer hence less compression at bottom??

It doesn't "technically" increase your compression. But yea it lets more Air/Fuel in so you are compressing more air into the same space. So yea the behavior would be the same as increasing your compression more. Think more along the lines of "turbo-boost" than "compression" when switching out cams.