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Suzuki MX & Off-Road Dirt Bikes
1996 RM250 carb fouling plugs
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[QUOTE="bwood, post: 1313519, member: 52787"] The lower the number on NGK plugs the hotter. The factory plug for the 96-00 RM250 (according to NGK) is a R6918B-7 and they are expensive $25+. If you have been using BR8ES, the BR8EG will work also. The ES is a standard plug and the EG is a racing plug with a "Fine Wire Nickel Alloy Center Electrode". But, it really sounds like a mechanical issue weather it be jetting, a leaking right side crank seal, bad reeds or a worn top end. I checked FMF's jetting center and they show similar jetting. Do you have to top your trans oil off often? THis could be a sign you are burning trans oil due to a leaking crank seal, simulating a lean condition. Also remember that your oil mix and your jetting are two different things. Your oil mix refers to the amount of 2stroke oil in you fuel and the lubricating properties of the mix. 32:1 (16oz of oil to 4gal fuel) is 32 parts fuel to 1 part oil and 40:1 (16oz of oil to 5gal of fuel) is 40 parts fuel to 1 part oil. The more oil you run in the fuel, the better the bottom end and rings will love you. Your jetting refers to how the carb mixes the fuel/oil mix and air that feed you cylinder. A rich mixture is a fuel to air mix with excess fuel. This will put more fuel/oil mix in the cylinder than it can burn at a certian rpm. Running rich generally will not hurt an engine, nut it can have plug issues and excess exhaust spooge. Running an engine lean means the fuel to air mix has excess air and is using less fuel for combustion, but remember less fuel in the cylinder means less lubrication. Running an engine lean will cause premature failure of the bottom end, piston/rings and possibly powervalve components. Also it can cause overheating and inconsistant performance (mainly due to overheating). My 99 CR250 was a little lean on the bottom end to allow low speed woods riding w/o loading up and blubbering when it was time to open it up. Then was more rich on the top. I always used the BR8EG, it was also the stock plug. I would start with failed parts first (ie crank seal or reeds), then doulble check the reeds. I believe there are some jetting links somewhere in the "sticky posts". Search them and see what you find. I would also recommend a service manual of some sort if you don't already have one. A Clymer manual will run you $32.95 at Tucker Rocky dealer (most bike dealer a TR reps). [/QUOTE]
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Suzuki MX & Off-Road Dirt Bikes
1996 RM250 carb fouling plugs
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