2000 rm 250 oil fowling problem

[punkrock114]

Hi everyone. I just became a member of this site and a good one it is. But neway heres the story i just got my motor rebuilt on my bike. 2000 rm 250 to be exact. I went riding today for the first time on it and i fowled out one plug. it was oil fowled. so i put a new one in it ran good for a while. brought it back home and it wouldnt start. so i got it to finally start. took the plug out cleaned it a lil starting fluid fired right up. the second plug was starting to get alot of oil build up on it. Whats the deal? i have boysen rad valves i just put in it, the needle in the carb it set at the third position and the main jet has been changed down from 158 (stock) to 155. and my gas oil mix is 32:1. should i decrease the fuel oil mix to ,like say 40:1 or 50:1? any help would be greatly appreciated. thanks

[Blade]

I would verify the plug heat range first and make sure you are using what is called for. Usually when you get a oil fouled plug on a two stroke, means one of 3 things. Your running oil/fuel mixture incorrectly (usually you run a little more oil on break in), your jetting is to rich so your are suppling to much gas/oil mixture or the wrong heat range on your spark plug.

[punkrock114]

the plug is definitly the right one. i rode it last night after getting it to fire up and now it wont start. i cleaned the plug off and it is now getting spark. im thinking with how the plugs were both oil fowled that the gas mixture is to rich with oil. im going to 40:1 from what others have told me. so now to fix the starting problem im going to rip the carb out and clean that, seeing how its probably all gummed up with oil and stuff. we`ll see if this works. any other suggestions would help

[Aussie Steve]

Sounds as if you are on the right track. Where did the 32:1 ratio come from?

[punkrock114]

hahaha...funny you should ask. it came from the kid i bought it off of. the same one who told me the bike ran great. after ridin it at my house for all of 30 minutes the motor siezed. i guess thats what you get for buying from friends

[punkrock114]

ok somebody please help me. this is gonna sound very strange. this thing ran great yesterday. now i go out and it wont start. i cleaned the carb like three times. i have lots of spark, compression and i pull the plug out and its wet so i got gas. and guess what....IT STILL WONT F@#!ING START! what is going on with this thing? last time i checked in order for a motor to run you need fuel, spark, and compression. If thats changed since motors were invented please someone let me know...

[Easy Rider]

Originally Posted by punkrock114

ok somebody please help me. .

I think you need to calm down a bit. Unfortunately what you are going through is not all that uncommon for an old 2 stroke.

If the plugs are wet, that means you are getting TOO much fuel at least when starting. Try not using the choke. If the plugs continue to foul beyond a 100 mile or so break-in then your mixture is too rich all the time.

First you need to find out what the proper mix ratio is. Like somebody else said, that probably should be a little heavier during break-in though.

Second, you need to get some new plugs. They will take only so much abuse (carbon fouling or swimming in gas) before they fail..........and sometimes they will fail IN the engine but look perfectly OK when OUT.

Many folks continue to run old 2 strokes that are in questionable condition by just changing the plugs every few days.

Have you talked to the engine rebuilder about all of this?
If not, why not? You SHOULD.

[punkrock114]

ok what im gonna do is get a new set of plugs. this will definitly help. i just dont like buying them considering they are 35 dollars a piece. but why it wont start i believe is beacuse it is flooded. i pulled the plug out before i went to work and am going to let it sit for a lil while and let it dry up. im also going to pull the plug out and crank it over with the gas off and try to get some of the excess gas out of there. as for the fuel mixture i bumped it up to 40:1. thats what the dealer told me. for breaking it it i ran two tanks of 30-32:1 before i bumped it up. we'll see if this works.

[KD57]

Who re-built the motor?

[Easy Rider]

Originally Posted by punkrock114

i just dont like buying them considering they are 35 dollars a piece.

[punkrock114]

"slealership"...

[KD57]

It shouldn't be but about 4 bucks, NGK BR9EG. KTM had some goofy plugs once that was 30.00, but not any of the Jap bikes. That could be your whole problem right there. What is the plug you have now?

[punkrock114]

and steal they did. they had the thing for threee weeks and 1600 bucks later here i am. only paid 1200 for the bike. well two tires and a frame that is...lol

[punkrock114]

the plug is a special high temp copper core irdium plug. very small electrode...hence very expensive. hehehe. man they get ya to spend money any way they can.

[KD57]

Check around, I never paid more than 10 bucks for them. We also ran the platinum VX plugs, they were only 8 bucks retail. Until you find the problem run the BR9EG's. If I were you, I would be making a trip back to the dealer and talk to the mechanic that re-built it.
FWIW, you really can't tell the difference between 32-1 and 40-1 ratio's. Assuming everything is right of course, and you are not riding it like a trail bike loading it up. It's a race bike, and it's meant to be ridden like one.

[punkrock114]

well i am trying to take it easy for a lil bit...i dont wanna blow this thing up again. but theres also that problem of them damn four stroker enduros in front...man they are slow lol

[punkrock114]

ok i need to know a compatible plug for this thing. im running that NGK-R6918B7 factory 35 dollar plug in my bike. i cant afford these things and need to know a compatible plug in the same heat range that will work for my bike.

[Aussie Steve]

Two other points to look out for on two strokes is carbon build up in the muffler/exhaust and around the exhaust port. This condition makes the engine unable to dump the spent gasses causing the plug to miss fire which in turn causes the wet plug symptom you described.

[punkrock114]

everything is clean. i dont have any carbon build up in there. it was rebuilt no more than a few days ago. but i found the problem. its soo flooded it isnt even funny. im letting it sit for a lil while until tomarrow when i get my plugs. hopefully by then itll be dried up in there. does anyone know of a compatible plug for this thing. the guy who built it said a br9es will work...should i trust him? i wasnt happy with how long it took with the motor so i dont know. also the plugs just look to different. from what ive heard the story behind using this plug is that the ignition curve is so aggressive on these motors and the engineers had concerns about "shockwaves" created in the combustion chamber and a standard plug wouldnt hold up to it. eventually causing breakage of the plug. now lots of people say they have used plugs in this heat range, which is 7 and have had no problems with them. what is my best alternative?

[Easy Rider]

Originally Posted by punkrock114

it was rebuilt no more than a few days ago. but i found the problem.

No you have NOT found the problem, you only found a major symptom.

I'm somewhat sorry about the following but at this point I think it NEEDS to be said........

What the HELL are you doing? You paid somebody $1600 to fix your bike. It is NOT fixed. Take it back to them and tell them you don't want it back until is IS fixed. Do they already have the total $1600? If not, they sure wouldn't get any more of my money until it was right.

What you are trying to do now is ......well.....a little stupid.