[motoman]

Can anyone shed light on why my bike tends to spew an excessive amount of oil out the exhaust pipe. I realize it's a 2 stroke, but by the end of a short ride, I have oil running down the entire length of the pipe. In comparison, my buddies KTM SX250 does'nt have any oil at all coming out of the pipe at the end of a good ride. (I'm riding at about 3700FT and running a 165 main jet, needle in the middle position)
Thanks.

 

[RM250BS]

Is it running down the silencer? Try repacking it.

 

[The Chad]

could also be trans oil, have you checked that out?

 

[motoman]

It's actually a brand new bike with about 10 hrs on it. It's had the problem since day 1.

 

[2001rm250]

I'm having the same problem with my 01 250. But i can't figure out why. I've tried changing the mixtures, and I don't know anything about 2 strokes, so i havent played witht he jetting or anything.

 

[Dave2122]

A few Questions

What type of premix oil are you using?
What is the ratio you are using to mix it?
Are you letting it idle alot?

 

[motoman]

I use Motul Semi Synthetic, and I mix at 40:1
I'm not usually hard on the gas all the time. Mostly I ride at a gravel pit so it's mixed RPM most of the time.

 

[Dave2122]

I can tell you the same as I told the other RM owner. Try and run it in the mid to high RPM range as that will keep it from loading up. Also you may have so much oil plugging up the silencer you will have to remove it and repack it. Once they are full of oil they will contiually dripp and spew oil.
I would adjust your premix to 50:1 and jet accordingly. Motul is an excellent lubricant and does not need more than 50:1.

I run my motul oil at 50:1 (2oz to a gallon) and have no oil build up. even when I do some woods riding. I have not fouled a plug in roughly 10 years

 

[motoman]

Cool. Thanks for the tips.

 

[crazyman]

I agree with "DAVE2122", 50:1 is THE dead-on Ratio with any Quality {Has to have the capability/functionability to be used at 50:1} Pre-Mix Oil. See my Post to the topic "Boggy 1st & 2nd gear NEED HELP PLEASE".

 

[sjordre]

motoman did u try the 50:1 mix for your oil problem, did it help or get rid of the excessive oil, i have the same bike and same problem since day one. im thinking of possibly changing the need and jets