Jetting - How to get rid of that black

[cr250ken]

I hate that black oil at the end of my pipe at the end of the day. My spark plug looks perfect but I still get that black junk.

So do any of you have the same problem?

[Aus_Rider_22]

It's a common thing on 2-strokes. As long as your spark plug is not fouling, oiling up you can be rest-assured there is nothing wrong with your bike.

Some say using fully synthetic oil helps. I use Motul 800 which is a fully synthetic Ester based premix oil. My bike only gets oil drips out of silencer if I lug the bike around and not rev it.

Hope this helps.

[Faded]

Three common causes:
[list=1][*]Oil type[*]Jetting[*]Fuel type[/list=1]

Most synthetics can help the spooge problem vs. running a conventional premix oil. If you're not jetted correctly than spooge can be a by product of overly rich jetting. If you jetting is correct then more likely than not your fuel is too blame. If you're using pump gas then spooge will just have to become a part of your everyday life. The short explaination is that pump gas requires higher intake tract temps to properly vaporize the fuel than most late model bikes are capable of generating. The result is some of the fuel your bike ingests undergoes the combustion process still in a liquid state and is unable to burn. This unburnt fuel ends up as spooge coming out the tail pipe.

[cr250ken]

"Spooge" Is that an official technical term? I'm using pump gas. I'm going to try one leaner main to see if it clears up. Otherwise I'll just enjoy riding. The bike runs awesome. Ran so hard the other day that my arms are still trashed two days later. Great day, though.

[HiG4s]

Originally posted by cr250ken
"Spooge" Is that an official technical term? I'm using pump gas. I'm going to try one leaner main to see if it clears up. Otherwise I'll just enjoy riding. The bike runs awesome. Ran so hard the other day that my arms are still trashed two days later. Great day, though.

Jet the bike based on the color of a new plug after doing a throttle chop run... not by the spooge.. Also spooge caused by jetting is more often caused by too rich a pilot jet than a main. Main only affects the mixture from 1/2 throttle to WOT..

Dropping the needle one clip position will lean the engine from 1/4 to 3/4 without affection WOT.

check out this

[Only registered and activated users can see links. ]

My sons old YZ85 would spooge even when I used good synthetic oil, and had it jetted right.. I wouldn't spring for race gas but found after market reeds actually helped some.

[HondaOnly]

Originally posted by cr250ken
"Spooge" Is that an official technical term? I'm using pump gas. I'm going to try one leaner main to see if it clears up. Otherwise I'll just enjoy riding. The bike runs awesome. Ran so hard the other day that my arms are still trashed two days later. Great day, though.

Dont do anything, just switch to a full synthetic, quailty premix oil, if you havent already. Make sure your air filter is clean your muffler is not in need of repacking, those two can cause the bike to run rich.

How bad is the spooge? All 2 strokes are going to produce residue to a certian extent. Also, how hard would you say you ran your bike?

[FFRacing11x]

Did you guys actually read Faded's post? Or did it just kinda sail right over the top? A properly running/jetted bike will NOT "spooge"! The only reason the reeds might have possibly affected the "spooge" output is because different reeds affect jetting differently. Yes that is a proper technical term listed in the FFR Glossary.

[HondaOnly]

Originally posted by FFRacing11x
Did you guys actually read Faded's post? Or did it just kinda sail right over the top? A properly running/jetted bike will NOT "spooge"! The only reason the reeds might have possibly affected the "spooge" output is because different reeds affect jetting differently. Yes that is a proper technical term listed in the FFR Glossary.

Yes, I did infact happen to read Fadeds previous post. I was simply restating what should be checked before rejetting.

Had you read Fadeds post more clearly, then you would have noticed that he said "If you're using pump gas then spooge will just have to become a part of your everyday life." and since CR250Ken is infact running pump gas, he is going to have to live with the spooge, and most likely it is not jetting related. Also, the spooge described does not sound like a severe case, as long as your spooge does not drip down your silencer and smear all over your swingarm, then its not that bad. It sounds to me like the spooge we are dealing with here is in the form of black ring around the end of his silencer, which is normal for all 2 strokes.

If ken is concerned about his spooge problem, then there should always be that list of things to be considered before tearing into his carb.

[HondaOnly]

Not to mention, if the bike runs just fine, then there is no sense in leaning it out. If you are using quality synthetic 2 stroke oil, then there should be nothing to worry about if its a tad on the rich side. The only time I would lean the bike would be if its loading up and its performance is not up to ones expectations. Until then, I would live with the spooge or invest in a 4 stroke.

[HiG4s]

Originally posted by FFRacing11x
Did you guys actually read Faded's post? Or did it just kinda sail right over the top? A properly running/jetted bike will NOT "spooge"! The only reason the reeds might have possibly affected the "spooge" output is because different reeds affect jetting differently. Yes that is a proper technical term listed in the FFR Glossary.

look FF, I know you are good at this stuff, but did you ready my post? and yes I did read Faded's post.. Like where is says if you use pump gas (because of its impurities and need for higher intake temp) spooge is something you will have to live with..

I said after synthetic and jetting I would not spend the extra for race gas (so I knew I would have to live with some spooge) but is was way more on the YZ85 than on my Husky 125.. After talking with several other fathers having the same problem on their YZ85s we came up with changing the reeds.. AND IT HELPED, just a fact.. The only reason any of us could come up with is that the factory reeds were just poorly made and metered fuel inconsistantly at different RPMS, thereby making it impossible to actually jet correctly across the throttle range. several of us changed reeds, using several brands and all found it helped. And knowing that all the Japanese brands tend to by parts from the same places I thought it might be helpful information.

Anyway, just to try to help a guy out I posted briefly, I didn't think I was going to be required to publish a book to explain all the nuances of my experience.

[FFRacing11x]

Sorry about the "harsh" reply. Think I will go take a chill pill and take a nap.

[HiG4s]

Originally posted by FFRacing11x
Sorry about the "harsh" reply. Think I will go take a chill pill and take a nap.

All that cold and snow getting to you already.

you can always do what I did,, move from Michigan to Florida:

See my avatar,,, that is my street bike, by my front yard, those are my palm trees

[cr250ken]

I use HP2 Honda Synthetic. The spooge, after about four hours of riding, does run down the FMF Q about 2 inches. Problem is, the bike runs fantastic. VForce Delta Reed = no bog. The biggest problem with the spooge is brushing up against it, getting it on my riding pants.

I just got back on 2strokes after having the CRF450 - 2002, 2003, and 2004. Near death crash on the track and I am back to trail riding. The CR250 02' is the best green sticker bike in SoCal so that's what I got.

Thanks for all the help.