Rm250 Problems.

**Lion** · 13th May 2007, 19:05

It seems my rm has a tendancy to destroy plugs. I get about a 1 hour ride before the plug goes. I am running a Ngk b8egv (the guy at the bike shop reccomended this plug). Anyone have any ideas as to why it might be doing this?

**B0000M** · 13th May 2007, 20:50

have you tried replacing the suzuki with an aftermarket honda?

alternatively,
how is your oil/fuel mixture?
are you riding like a bitch?
is your crank seal gone?

**Lion** · 13th May 2007, 21:01

Running 40:1. I'm going to get some motul 2 stroke oil after school tomorow and see if that cures the problem, it is smoking quite badly. Yeah I am riding like a bitch, the neighbours complain if I fang it. The crank seal was just done before I bought the bike so it should be fine.

**scott411** · 13th May 2007, 21:25

if you are running a 40:1 on syntehtic oil they should be fine, sounds like your jetting is two rich, try a leaner pilot or main jet

also try a BR8ES, they are cheaper and if you are just crusing around they are less prone to fouling,

**cheese** · 13th May 2007, 21:39

I've kind of had it with Motul. It smokes like a fucker in my bike too.

Just run with castrol TTS.

I'd say if you aren't fangin it enough you have teh plug fouling. You may want to get it jetted.

**Henk** · 13th May 2007, 21:54

Yep jetting is the problem. May also be time to do the rings depending on how fresh the top end is.
Run B8es plugs. They won't foul any sooner and cost half as much. The type / brand of oil you are running isn't the problem.

**Lion** · 14th May 2007, 07:28

I am running mineral based oil, shouldn't make to much of a difference should it? The topend is around 3 hours old, I hardly ride this bike.

According to the manual, the jetting is stock. How much will it roughly cost to get my bike jetted / tuned?

**barty5** · 14th May 2007, 07:53

Originally Posted by cheese

I've kind of had it with Motul. It smokes like a fucker in my bike too.

Just run with castrol TTS.

I'd say if you aren't fangin it enough you have teh plug fouling. You may want to get it jetted.

try elf used it in my cr never had any probs with smoke or fouling

**scott411** · 14th May 2007, 08:30

Originally Posted by Henk

Yep jetting is the problem. May also be time to do the rings depending on how fresh the top end is.
Run B8es plugs. They won't foul any sooner and cost half as much. The type / brand of oil you are running isn't the problem.

you need to run BR plugs, they have a risitor for electracal noise which RM's and YZ's are particuly bad for, i would run all late model mx bikes on risitor type plugs,

**scott411** · 14th May 2007, 08:32

Originally Posted by Lion

I am running mineral based oil, shouldn't make to much of a difference should it? The topend is around 3 hours old, I hardly ride this bike.

According to the manual, the jetting is stock. How much will it roughly cost to get my bike jetted / tuned?

yes mineral oil does make a difference,

it is pretty easy to rejet the bike yourself, jets should be $10 to $15 each

Scott

**yokel** · 14th May 2007, 09:07

im not sure but i think you can run in to trubble mixing mineral and syntehtic oils may pay to check this out.if the jetting is stock and its been fine for the last 10 years mybe its not the jetting,has this been recent problem?
check the float level in the carb and make sure theres no gear box oil getting past the crank seal.

**Lion** · 14th May 2007, 10:09

I will dump all the fuel and put in some fresh mix. The jetting seems to have been fine? I don't think the crank seal is leaking.

**Lion** · 14th May 2007, 17:42

Well I drained the fuel out and put in a fresh mix using castol TTS at 40:1. Now the bike runs for about 5 seconds then fouls the plug.
I will pick up one of those br8es plugs after school tomorow.