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upbasher Added a reply to Hanging idle yz250x
6/12/2026 6:41pm I put the stock reed cage back in the bike. Problem solved. It idles down consistently and also has a nice steady idle now. WTH? I have not heard of vforce reeds causing this before. Now I am trying to find out if I just had them installed wrong. I used both gaskets that came with them, one in between...
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upbasher Added a reply to Hanging idle yz250x
6/11/2026 5:47pm Also tried briefly running with no air filter in case it was causing an air restriction, no difference. Inspected reeds, they are perfect.
upbasher Added a reply to Hanging idle yz250x
6/11/2026 5:45pm I went ahead and bought a brand new keihin pwk from JD jetting. No fix. Exactly the same. I'm at a complete loss. The idle screw is almost all the way in to keep the bike running. I can back the air screw completely out and the bike is still rich on the low end, loads up and dies instead...
upbasher Added a reply to Hanging idle yz250x
5/31/2026 5:59pm So been a bit but I have fiddled some more with the bike and done some more research and have not come up with much. At this point the only thing I can think to do is try a different carburetor. I am considering a complete replacement pwk38 airstriker (Without the tps and power jet solenoid castings) from either keihin's...
upbasher Added a reply to Hanging idle yz250x
5/11/2026 5:59pm They are blocked off simply because I prefer the simplicity of not having them. And no it has always done this, even from brand new with the tps and power jet installed and functioning normally
upbasher Added a reply to Hanging idle yz250x
5/11/2026 10:20am Yeah I leak tested mine and there's no leaks around the carb flange/reed block. I tested a br9eg plug just for the hell of it and no luck exactly the same. (Expected). I'm at a complete loss now as of what to do. I don't know what else it could be besides the carb and I don't feel like dishing...
BRX-WRX Liked a reply to forum topic Hanging idle yz250x
5/11/2026 10:17am
I had a simular problem with YZ125. The jetblock gasket was bad. Then I added another gasket to the other side of Vforce reed block because it wasent sealing. Same gasket works both sides.
This forum topic has 33 replies.
upbasher Added a reply to Hanging idle yz250x
5/10/2026 1:32pm Well, I got the new jet block gasket, installed, tested, no difference. Did not fix the problem. Also verified that the air screw o ring is in good shape. The choke knob/lever seems to also be fine, it fits snug and isn't bent at all. All passageways in the carb are clean as can be and open. Slide and needle...
upbasher Added a reply to Hanging idle yz250x
5/7/2026 6:53pm Interesting! I must have been lucky so far to never run across a bike that needed it lol. On my bikes I usually replace or clean the filter as soon as it has any visible buildup on it. Which is usually after one ride if it's dusty at all. Anyway the slide in it looks like new, I cant even...
Karlsrad Liked a reply to forum topic Hanging idle yz250x
5/7/2026 6:50pm
Yes correct, the slide is designed to wear out before the carb itself. The slide is made of Zinc Alloy, which wears out before the alum carb body. It usually takes alot of hours to wear a slide out, but it also depends on the maintence on the bike. If someone is bad at replacing air filters, etc. Or rides in a area with alot of sand or fine dirt. Its can wear a slide/needle out quickly. Anytime I buy a used 2 stroke, I do a top end, and replace the slide/needle and cable. Might be over kill but...
This forum topic has 33 replies.
upbasher Added a reply to Hanging idle yz250x
5/7/2026 3:05pm I have not heard of replacing the slide as a wear part before. What is the reason for this? Does it actually wear out and let air through? I find it hard to believe the metal slide would wear out before the cast aluminum carb body, or even wear at all considering is constantly covered in oily fuel. Obviously I'm...
upbasher Added a reply to Hanging idle yz250x
5/7/2026 2:59pm I bought it new. Its that stuff that dries kind of hard. I believe they may just use it to hold the gasket in place when assembling? Could be wrong on that. My Beta that I also bought new had it as well on the carb bowl gasket
BRX-WRX Liked a reply to forum topic Hanging idle yz250x
5/7/2026 2:58pm
You will notice the JD gasket is stronger than the OEM. Lightly smear some grease on it to help hold it in place when assembling .
This forum topic has 33 replies.
Karlsrad Liked a reply to forum topic Hanging idle yz250x
5/7/2026 2:58pm
Give your slide a good look. If there is any wear, marks, etc. Replace it with a new one. Possibly your needle as well. Consider both of these pieces wear out parts.
This forum topic has 33 replies.
upbasher Added a reply to Hanging idle yz250x
5/6/2026 5:47pm My spark plugs always come out a nice golden brown, never white or black.
upbasher Added a reply to Hanging idle yz250x
5/6/2026 5:45pm Got it thank you. I did order that one. I took the stock one out, and honestly it didn't look too hot. It was packed with that goopy orangeish sealant they use from the factory. (Same on the bowl gasket). Looked, at least to me, like they used too much...some appeared to even be spilling out and even partially blocking...
dkurtd Liked a reply to forum topic Hanging idle yz250x
5/6/2026 5:40pm
You can also get them from Jets R Us. Carburetor jets, parts and tuning items - Jets R Us
This forum topic has 33 replies.
mxrose3 Liked a reply to forum topic Hanging idle yz250x
5/6/2026 5:40pm
What does the plug look like immediately after a hard ride? I had pretty much the same issue with uneven jetting - Main and needle were lean and the pilot was rich. It takes a little bit for the pilot to 'catch up' and richen a lean condition after holding it wide open, and this sort of thing will happen. Not saying that is your problem - but its something to look into. Try all of the above first.
This forum topic has 33 replies.
upbasher Added a reply to Hanging idle yz250x
5/5/2026 4:05pm Thank you
BRX-WRX Liked a reply to forum topic Hanging idle yz250x
5/5/2026 4:05pm
JD jetting
This forum topic has 33 replies.