rm250 foiling plugs like crazy

driversix

Member
Aug 4, 2005
83
0
i just went out on it the other day went about five minutes and i foiled a plug same thing happened with another three plugs im runnin 5 to one mixture with synthentic oil what should i do
 

2-Strokes 4-ever

~SPONSOR~
Feb 9, 2005
1,842
4
Missouri
4 oz of oil per gallon
 

Britt Boyette

Member
Aug 16, 2004
280
0
Buy a Ratio-Rite from your dealer for around $5. Best thing I ever bought. I run Sprectro synthentic mixed at 40:1, works fine.
 

driversix

Member
Aug 4, 2005
83
0
actually im not sure if it was five to one i was told to put 1 full bottle of bel ray 2 stroke racing oil into five gallons of 93 octane the bottle has 13 ounces in it so what is that mixture
 

FruDaddy

Member
Aug 21, 2005
2,854
0
Def diff mixture, I run 40:1 motul 800 in 93 octane. I don't know of anyone that runs more oils than that. 32-40 seems the range. Do get the ratio_rite and if possible get the lid. If your dealer doesn't know what a ratio rite is, consider a new dealer. These can be purchased either together or separately from Dennis Kirk, sometimes a dealer won't have the lid but it keeps the crap out so all you have to do it measure and pour.
 
Last edited:

snb73

Member
Nov 30, 2003
770
0
driversix,

I have an 03 RM-250. I run a 40:1 mixture with spectro synthetic and use a NGK BR8EG or ES plug. 40:1 seems to be a good ratio for 250's. Pick a good quality synthetic oil that is available locally. I stay away from castor based oils, they seem a bit finicky for me. Don't fiddle with the gas/oil mixture in an attempt to keep a plug from fouling. Try rejetting your bike. Since rejetting my bike I haven't fouled a plug, it's been 6 months.

Hope this helps, Steve.


Here is some good reading;

http://www.dirtrider.net/forums3/showthread.php?t=42618

http://www.thumperfaq.com/mxa_jetting.htm


Here are a few sites to give you a baseline;

http://www.fmfracing.com/jetting_2002.asp

http://www.onthepiperacing.com/forum/viewtopic.php?p=300&sid=13b59d01224f05752262287028eaf11e

http://www.mx-stuff.com/jettingspecs.htm
 

DLHamblin

Member
May 27, 2005
268
0
driversix said:
i just went out on it the other day went about five minutes and i foiled a plug same thing happened with another three plugs im runnin 5 to one mixture with synthentic oil what should i do

Did it just start doing this? Has it been running well in the past?

Is it stock or modified? This additional info can help others lend better advice.
 

driversix

Member
Aug 4, 2005
83
0
i havent gotten a chance to try ne thing yet ive been away but am going home to try it this weekend thanks for the help everyone
 
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