Added reply in a thread CR 250 rear master cylindert 10/15/2020 8:44 PM

Any CRF rear master cylinder from 02-20 will work/ bolt onto your frame. The only difference that I have seen, is the piece that connects the master cylinder to the brake pedal, which can be easily changed out. The master cylinders themselves are all ... more »

Added reply in a thread KTM/HUS 125/150/250 jetting thread 10/15/2020 1:10 PM

Yes, especially with the notched front side of the slide. I ran a 22.5 In a 300 XC in high DA air. This is for an XC or XC-w 300. I haven’t tested with a converted 250 sx to 300, yet.

Added reply in a thread KTM/HUS 125/150/250 jetting thread 10/14/2020 9:04 PM

If you go to page 5 and look at the slide I have posted, I took the picture before I finished/ smoothed it, so that you /anyone could see where I cut and blended. I use a black magic marker, a digital caliper, Dremel/die grinder and a small sanding drum. ... more »

Added reply in a thread KTM/HUS 125/150/250 jetting thread 10/14/2020 8:49 PM

I think you're pretty close jetting wise, but trying to over compensate on the lean side of things to try and correct the rich slide. Once you cut the slide to a 5.5, I don't think you'll need to run the clip in #1, probably #2 or 3 for this time of ... more »

Added reply in a thread Issues with PWK on KX125 9/11/2020 8:57 AM

it sounds like you're into the pilot circuit and or needle starting diameter and possibly the clip height. The first thing I would do is richen up the pilot to 48 or 50. The air screw may also need to be turned in as well.

Added reply in a thread Issues with PWK on KX125 9/10/2020 3:02 PM

We need to know in what part of the throttle range (0--25% 25%--75%, 60%--100%) the bog is happening in, so that we can help identify which part of the carb needs to be adjusted, pilot, needle, main....

Added reply in a thread KTM/HUS 125/150/250 jetting thread 9/10/2020 12:35 PM

I've never been a fan of running AV fuel over specific non o2 race fuel. I've always found that the AV fuel burns dirtier than pump or race fuel in a 2t bike, unless using a low flash point 2t oil. Don't get me wrong, it works well enough but, it's dirty. ... more »

Added reply in a thread Issues with PWK on KX125 9/2/2020 3:01 PM

I meant the short body PWK. The internal jetting is easy enough to change.

Added reply in a thread Issues with PWK on KX125 9/2/2020 11:33 AM

That the correct carb for your bike. JD sells a kit for small bore bikes,125/150 and one for 250/300 bikes. The kit for the larger cc bikes will not work in your 125.

Added reply in a thread Issues with PWK on KX125 9/2/2020 11:25 AM

Did you try the needle and specs that I suggested, CCL needle, 48 pilot and 178 main ? They should work with the 6.5 slide best. What JD jetting kit did you get for your bike ? The small bore JD kit should have needles that have scribe lines under the ... more »

Added reply in a thread KTM/HUS 125/150/250 jetting thread 8/31/2020 11:32 AM

Think of the notch as an enhancement to the pilot jet circuit and air screw. The notch typically effects under the needles 30%--75% range. There may be a little crossover, but it's not much. The small diameter needle works OK, but it will run a little ... more »

Added reply in a thread KTM/HUS 125/150/250 jetting thread 8/31/2020 4:34 AM

Great to hear feed back. By creating or opening up the notch on the front side of the slide , it causes the pilot circuit to function a little more efficiently, which in turn makes the first 30% or so of the throttle range a little richer. This is where ... more »

Added a comment to outinthesticks's profile 8/20/2020 8:08 PM
digger

I don't have any experience on unplugging the TPS on an RM, but I have left it unplugged on Honda cr125's and 250's, and also on Yamaha YZ250's with great results. 99% of the people with those bike would have know idea that the TPS and power jet were not plugged in when the jetting is setup correctly. As and added bonus, the bikes are easier to jet without the plug in's.

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Added reply in a thread KTM/HUS 125/150/250 jetting thread 8/19/2020 11:08 PM

With those temps and elevation, you're probably looking at a correction factor of .93 or so. With that said, I don't have much experience with jetting for elevation. A .93 factor would put you at Needle, 42-74 in clip #2, Pilot at 32.5 with the air screw ... more »

outinthesticks left a comment 8/19/2020 8:54 AM
outinthesticks

Hey Digger,

I was reading a thread where you were commenting on blocking the power jet on a 2003 rm 250. I'm in the process of tearing down my carb and I plan on blocking the power jet as well as sending my head and cylinder off to Tom Morgan.

I was wondering though, do you have any experience disconnecting the TPS? Is that something you'd recommend doing?

Thanks.

I don't have any experience on unplugging the TPS on an RM, but I have left it unplugged on Honda cr125's and 250's, and also on Yamaha YZ250's with great results. 99% of the people with those bike would have know idea that the TPS and power jet were not plugged in when the jetting is setup correctly. As and added bonus, the bikes are easier to jet without the plug in's.

Added reply in a thread Jetting help for 2007 KX250 8/18/2020 6:39 AM

I see what he is trying to do there, but That is Still going to be one hard hitting engine into mid with that series needle. There is no getting around it, and still have the bike running cleanly off the bottom. I’m taking into account that the majority ... more »

Added reply in a thread KTM/HUS 125/150/250 jetting thread 8/13/2020 8:11 PM

He could certainly try backing the air screw out as well, but It sounds like he's into an off idle bog situation , which is typical of a needle that has a starting diameter or 1st taper that is too lean. If it was rich, I would expect more of a stutter ... more »

Added reply in a thread KTM/HUS 125/150/250 jetting thread 8/13/2020 7:45 PM

Try turning in the air screw, and if it doesn't get better, move the clip to the 4th position. if still not better try using a richer pilot. Do you have access to a dial/digital caliper and a round file ? Look at the slide above that I cut. That all ... more »

Added reply in a thread KTM/HUS 125/150/250 jetting thread 8/13/2020 7:13 PM

What clip position is the needle in now ? Change the clip position to a richer setting. Turn the air screw in and or change the pilot( richer/larger). Notch the front side of the slide like the above pic. The jet block gasket really need to be replaced ... more »

Added reply in a thread KTM/HUS 125/150/250 jetting thread 8/13/2020 5:34 PM

The 42-75 needle is to lean for your 125. You should be using a 42-74, which is one size richer on the starting diameter. I also recommend that you open up the front side notch on the slide. It seems to be more beneficial on the 125/150's. Have you replaced ... more »