OIL MIXTURE

[monster malibu]

Hey guys, I was wondering what rate you mix your gas/oil. I was told to run my bike at 32/1, does this sound right? Should my mixture be closer to 50/1? I mixed the first 2 gallons over 32/1 because it's got a new piston. 

[alan]

You may want to read these posts!
http://www.kxriders.com/forums/index.php/topic,1347.0.html

You will find that the answer is anywhere form 32:1 to 100:1 and everywhere in-between!
It depends on the type of oil and how brave you are! I have been using Kawie Kem at 40:1 for years and I bought some Amsoil  that claims I should mix it at 100:1 and I haven't been brave enough to try it yet!

 

[moreccsthanlbs]

when i bought my 500(new sept.99), i ran 32:1 and fouled plugs like crazy. now i run motul 800 @ 40:1 and haven't had any problems. i run my bike hard in the deserts of so cal, and i'm still on my stock piston and rings. pulled the cylinder off this summer, just to have a look, everything still looked good. my motto...if it ain't broke, don't fix it. like the above thread said, you'll be told everything from 32:1 to 100:1. just my 2 cents, 40:1 with a quality oil and you'll be fine....the 500 is a bullet-proof motor.

[kaw rider]

it's your fuel mixture that doing it. not your oil mixture. i run my at 24:1. no oil dripping from exhaust. i will be going lower then that.

[FactoryPhil]

my motto...if it ain't broke, don't fix it. like the above thread said, you'll be told everything from 32:1 to 100:1. just my 2 cents, 40:1 with a quality oil and you'll be fine....the 500 is a bullet-proof motor.

I agree. I recommend to all my customers at my shop to try 40:1 if they are fouling plugs. To go any leaner on the oil than that is really unnecessary. Spark plug selection also helps greatly. The racing plugs that are so expensive i.e. the GV and GVX plugs, have a finer center electrode that the spark is coming from. The finer electrode with the same amount of juice running through it as a standard plug's electrode helps the firing area keep from fouling without having to change the heat range of the plug. Basically, I think the better plugs are worth the money.

[BigGreenMachine]

More oil will give you a better ring seal meaning more compression and will also reduce friction...both of which will give better performance.

[kaw rider]

i'm shooting for 8:1 oil ratio.

[FactoryPhil]

Let us know the results

[Johnniespeed]

  I bought my KX500 new and was nervous about not using enough oil. I simply stuck with the factory 32 to 1. After two hundred fifty gallons of fuel through it, I took it apart to look at the rings and bore.  Everything looked like new, but was a bit too oily to suit me.  So I just went to 40 to 1 , plenty of oil for me. I have been thinking of dropping to 50 to 1 for next year. Now that the bike is no longer new, I am more confident to take risks. 
  Every one has an opinion and this is mine.  John

[gowen]

More oil will give you a better ring seal meaning more compression and will also reduce friction...both of which will give better performance.

Your motor will also run very hot. Oil burns way hotter than gas. Also, more oil means more spooge and clogged powervalves, along with carbon buildup, which also leads to overheating.

I ran 50:1 doing dragracing sometimes holding WFO for 1-2 minutes on the flats running a PVL which boosts the RPMS up about 20%. My motor ran cooler and jetting was easier after switching to 50:1 over 32:1.

[don46]

I agree with Gowen, more oil = less fuel and at ratios discussed above I would think it would definately generate more heat.

Taos cycle in New Mexico ran tests on Snowmobiles, at the end they determined to much oil was worse than not enough.

As a personal preference I use 40:1 and the important thing is to use a good quality oil, whatever brand. I won't use Maxima 927 as stated by BDI in one of these posts, it seperates when cold, you go to start your bike and it won't run because the carb is full of oil.

[kaw rider]

you guys are right. but when i race we have a track that we hold the throttle wide open for 20 laps. and these motors are under a very high load. after ten hours of run time i have no carbon on piston dome or in exhaust port or kips aren't carbon up at all at 24:1.

[alan]

i'm shooting for 8:1 oil ratio.

Are you trying to cover your trail with smoke?

[gowen]

you guys are right. but when i race we have a track that we hold the throttle wide open for 20 laps. and these motors are under a very high load. after ten hours of run time i have no carbon on piston dome or in exhaust port or kips aren't carbon up at all at 24:1.

You are wasting oil. But, if it works for you, that's fine. 24:1 is extreme - 8:1 is just crazy.. Slightly more than 1 1/2 quarts of oil? I'm going to assume you are not serious.

[kaw rider]

here are the ratio at one gallon of gas.

100:1  1.28oz
80:1    1.6oz
50:1    2.56oz
40:1    3.2oz
32:1    4oz
24:1    5.3oz
16:1    8oz
12:1    10.6oz
8:1      16oz

so if a guy went from 32:1 to 50:1 that's only 1.5 oz less oil. if a guy went from 32:1 to 24:1 that only 1.3 oz of oil.

i have seen on the dyno 8% hp increase from 27:1 to 20:1 at max power. and 2% more at 16:1 ratio.