mugenspoongsr

I just got a cr250, and when i let it sit there and warm up black stuff like carbin but wet comes out of where the two pipes meet. like the header and the muffler. it actually made a little puddle on my garage floor. What do you think this is?

MSchu

that's not a header that's an expansion chamber.. if it is black it is fuel and it's mixing with water condensation

ScareyH22A

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MSchu &raquo;</TD></TR><TR><TD CLASS="quote">that's not a header that's an expansion chamber.. if it is black it is fuel and it's mixing with water condensation</TD></TR></TABLE>

That's what I'm thinking also. Probably running rich and have fouled up plugs (edit I have no idea if a 2stroke even has plugs).

mugenspoongsr

im running rich? how do i fix this

mugenspoongsr

the bike is also jetted. idk but do i have to replace the bowls in the carb? please help, i want to ride

PGK

it's an exhaust leak, and you're running rich probably. does the stuff smell like gas? if it's jetted, you might want to lean it out a bit, some needles have moveable locating clips, move it up a notch to enrich and down a notch to lean. if this all sounds like a bunch of jibber-jabber then take it to a shop, or go buy a book or two.

racerxadam

It's not a big deal. All two strokes have residue left in the exhaust, it is left over oil from the combustion process. You will probably also end up with a trail coming out your silencer and running down the silencer. Your bike may be jetted rich, and could contribute to it, but you won't really know until you take it out for a good hard blast and then check the plug afterward. You are looking for a dark golden brown color on the plug. White indicates lean and black indicates rich.

mugenspoongsr

alright im going to take it out friday and saturday and check the plugs. If its running rich is this going to hurt the bike. after i fidn out if its rich all i have to do is turn the needle down. where is that located? I am also going to change the oil with some gold specrtrum oil pretty soon before winter.

racerxadam

Running rich won't do any damage to the motor. If it is too rich you may experience bogging when you go to open it up. Another side effect of being too rich is that you may foul spark plugs more frequently. Once you find out where you stand as far as jetting goes, i.e. too rich/lean, you will need to make adjustments to the carb.

There are a few different parts to your carb that control different parts of the throttle range. The main parts that you should be concerned with are the pilot jet, main jet, and needle. The pilot jet controls fueling at idle and somewhere up to 1/4 throttle, at that point the main jet starts to take over. I use the needle to make fine adjustments once I've settled on the correct main jet.

As far as I know there aren't any screws on the carb that will allow you to make jetting changes other than maybe an air screw which can help you tune your tip in. To make changes you are going to have to change the actual jets in the carb. Main jets can sometimes be accessed through a bowl drain in the bottom of the bowl. Generally pilot jets are going to require dissasembly of the bottom of the carb. The needle has a number of different positions that you can set it at for fine tuning, in order to change the position you will have to disassemble the top of the carb and change the position of a clip that holds the needle.

If you're a do it yourselfer and have some mechanical knowledge you should be able to figure this out by just tinkering, if you run into problems try to get ahold of a factory service manual. It will explain everything pretty well.

mugenspoongsr

thanks for all the help, im going to take it out for a good ride tomarrow and check the plugs. but if i leave it as is it will be fine? i dont feel any bogging when i open it up.

MSchu

who said anyhing was wrong with your bike?

mugenspoongsr

no one. when i went out and warmed my bike up, it left a black puddle on the ground, and i might have a little exhuast leak. was wondering if i was running rich. why?

mugenspoongsr

just checked the spark plug, and the electrode or the tip is golden brown and like 3 threads are black, but i think thats normal. so i might be running a little rich, but nothing to mess with. in the spring after i change my plug and change the oil with gold specrtum i will get it tuned right. Anyway, how do you guys winterize your bike? Stabilizer, dont think you can do that in 2 strokes but idk, drain all fluids out, and or start it up about 3 times a week and let it run?

MSchu

golden brown is good... lite golden is best do you need any pre mix? I have quartz and quartz for sale... motul

mugenspoongsr

ill probally get more mix when i change the oil and everything in spring. i have about 2 gallons of mixed gas right now and i dont hitnk im going to go through that now, in the winter.

racerxadam

Mixed fuel goes stale quickly, I wouldn't run fuel in a 2 stroke that I cared about that was older than 1 month. As far as winterizing, I would drain the fuel from the tank and carb to avoid varnishing. The oil in the cases is just there to lube the transmission on a 2 stroke so it should be fine to sit over the winter.

mugenspoongsr

alright thanks for the help.