250-500cc WR 250 - Loss of Power and Lots of Spooge

We'll see. But what about the excess oil? Should I raise the needle clip to lean it out or just run it first with the new silencer and cleaned jet and see how it goes?

Once again, thanks everybody!

If I were you I wouldn't change the jetting until you ride it after the things you for sure fixed (pilot jet unclogged, silencer screen unclogged). You are likely to create another problem by changing more than one thing at a time.

Don't raise the clip. I tried the JD red in the first clip and I thought it was too lean, I very quickly switched it back.

The bike may have been running rich because of the plugged spark arrestor. Get that sorted and ride it and see how it feels.

Thanks Lankydoug and Kyle. That's how I'll proceed.

It got me places!

Just ran it with my old silencer with the spark screen removed, carburetor/pilot jet cleaned and left side pv cover removed.

Started a bit easier than usual.

Idled really fast, a lot faster than before, without me adjusting anything to make it do that. I thought the throttle was twisted! Used choke than closed it. Still idled fast. I'll adjust that later. Oh yeah, a lot of white/light gray smoke, too.

Gassed it in neutral and saw power valve linkage moving so I guess it's working.

Did a 10 minute ride. It took off like a rocket and stayed that way! Then got on pipe and it took off again. No stumbling at all like on Sunday's ride. It hasn't run this good since I bought it. And no drool! Maybe 10 minute ride isn't long enough to prove that out, though.

Can't wait to see what it does with the new silencer.

Thanks everybody for your fast and great help. Going to Great Adventure tomorrow after work with family so I can't report back on Q stealth until Friday or Sat.

Just a little more info that may help... JD had me install the 410 Main, 32.5 pilot, white needle and I'm on the 3rd clip. The air screw is out 1 full turn and 1/8 more. I started with the air screw at 1.5 turns out and it was so lean it wouldn't run. Keep in mind, I'm at 1000 feet, 90 deg temp and 85+% humidity. I am running 'Water Pumper' synthetic premix 40:1. I'm sure I'll need to richen it up when the temps go below 65 deg.

I'm using same here riding say 2500-6000 elevation now. Working good. My AS might be 1.25 tho. Glad you got a JD kit and his recommendations. I had my bike sit for three weeks recently with non-ethanol fuel and 32:1 oil. Tipped on its side, choke on, cycled the kicker a few times, TDC, hard kick, fired - first one. This is first for me so that means the 32.5 PJ is a lil lean for temps below 55*F IMO.

Did you also change the main nozzle too?

Excess oil has nothing to do with jetting,just mixture.

Ktm 300exc is 60/1. Spooge is indication of mixture.

My 13 had next to no spooge at 60/1

Actually spooge has to do with the combination of the #1. flashpoint of the mix oil you are using and the #2. combustion temperature.

I can and have gone from 25:1 to 40:1 with no difference in spooge. My bike is correctly jetted so it makes enough combustion temperature to almost completely burn either ratio. If you have time go to the Ammsoil website and look up the specs on Dominator and Interceptor mix oil. http://www.amsoil.com/shop/by-product/motor-oil/2-stroke/ You will see that there is about a 10 degree difference in flashpoint. Dominator is for all out extreme racing conditions while Interceptor is more for trail riding situations.

This has been discussed here on other threads and some riders who ride singletrac have switched to a lower flashpoint oil and cleaned up their exhaust without a jetting change or a ratio change.

I'm about to start searching websites, but does anybody know of oils with lower flashpoint than Dominator? My 2 shops I have access to only carry Dominator, among others. No Interceptor. I think I also saw Belray and Maxima, both synthetic I believe.

I wouldn't worry about it too much.

I use Maxima Super M and have been very happy with it. Lots of other good oils out there too, as evidenced by the many threads here on the topic.

I had trouble finding Ammsoil products so I paid about $20 for a 1 year dealer card and then I bought a enough Interceptor and Dominator to last me 4 years. I saved more money then it cost because I got a discount. I mix 1/3 Interceptor to 2/3 Dominator @40:1 and it works out perfectly for me.

Maxima super m injector oil blend has a low flash point as does interceptor.

I use Maxima K2 and have very little spooge. I would not worry much about flash point of the oil. Yes, jetting has a big effect on spooge as does the amount of oil and of course the riding style of the rider. Some bikes spooge a lot more than others. I have ran several oils in my Husky and all have caused very little spooge. I tried at least a half dozen oils in my old KX and it was just a much more spoogey engine no matter the oil and lots of jetting changes.

Thanks again everybody. I just ordered a few quarts of Interceptor.

Well, I think my saga is complete, at least the 'falling flat when it should be on the pipe' part. I installed the fmf and adjusted the idle, went for quick ride around block and all seems good. No drippage either.

To adjust idle to be slower, I had to turn the air screw in to get the idle screw to cause a change in the idle speed. The air screw is almost all the way in. Is that ok? I never adjusted the air screw back out, though. I'll experiment tomorrow. I followed the idle adjustment procedure in the service manual.

What he said.

Generally, you adjust the air (mixture/pilot) screw to get the ideal mixture, and then adjust the idle screw (the throttle stop) to get the right idle speed.

The standard way to adjust the mixture is to get the bike warmed up (not riding-around-the-yard warm, actually warm, like during a ride) and then adjust the mixture screw for the highest idle speed and best off-idle response. Basically you turn it in until the RPM starts to drop, turn it out until the RPM either stops going up or starts to drop, and set it somewhere between those two. Should be around 1.5-2 turns out. Then you adjust the idle speed with the throttle stop screw.

Given the jetting you have, I'd probably just set the air screw to 1.5 turns out and be done with it, unless it causes an obvious problem. Some guys are more finicky with carbs than others...