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Barely smokes once I run it and clear it out. 93 octane pump gas. 32:1 ratio and I run pennzoil semi synthetic but it ran the same with klotz super techniplate.

Got a video of it running. This was with 55 pilot and more than 3 turns out on airscrew. Actually sounds pretty good but you can hear the surging/popping after I rev it up. You can really hear it near the end. What do you guys think? https://m.youtube.com/watch?feature=youtu.be&v=1EtcGhU-RkM

Just now I went out and let the bike warm up to around 140-150 degrees. It fouled a spark plug idling(br9eg) so I replaced with the proper br8. Tried leaning out the airscrew(going out) and got all the way to 3 1/2 turns out and it didn't really sound lean still. Only thing it's doing that seems weird is it's...

Doubt that's gonna hurt it. Any other ideas? Next steps? Thanks for the ideas so far

Heres some pics. Slide looks factory. Plating looks in good shape. #7 slide. Haven't tried the grease thing, it's been raining .

On my yz125, I ran with and without vent lines and it never effected the way the bike ran but I'll try next time I mess with it. Yep, i set the float correctly, where it's touching but not compressing. It was parallel to the gasket surface at that point. Bike only seems lean at idle. Was actually a touch...

ok, next chance I get I'll check slide looseness and cutting and also snap a pick. Oddly enough, I have to have the idle screw all the way in for it to stay idling , and it still dies after a few seconds when it's warmed up.

Factory slide , number 7 I believe. How do I tell if it's stock, I never cut it so I doubt it but not sure. Plating is barely peeling, looking pretty good to me

Totally forgot that this bike has no vent lines, I haven't put them on yet. And I sprayed every passage including vent line holes with compressed air yesterday so I don't think that's the problem. But thanks for the idea for sure!

But deep down I'll always wonder why she needs a 60 pilot to run properly. Oh well lol

I'm running lean. That won't do anything for me.

Throttle cable is good, has good free play. Reeds looked good. Got the bike a month ago. Had a bad transmission gear, broken power valve governor and bad ignition coil. Along with other things like a stuck rear suspension. She's come along way and is actually a beast besides this small issue.

Thanks for all the help guys, keep the ideas coming! Carb settings are 55 Pilot, 0 turns out on airscrew, N3EW 3rd clip, 172 main, power jet stock, float height parallel to gasket surface. Temps around 60 degrees and I'm at sea level. Lean on pilot(worse when cold outside), good on needle(based on feel), and was rich on main with...

The problem is really on the pilot circuit. It feels good in the midrange (3rd clip N3EW) and a bit rich up top(178 main). I went to a 172 main but haven't brought the bike out to test with the main yet. Mainly been tinkering with the pilot trying to get it to stop surging after revving at idle. When...

Currently I have a 55 and airscrew all the way in. If I turn it out even 1 turn (55 degree day) it starts to hang and idle starts climbing(like I'm running out of fuel). If I put in a 48, it's big time lean and surges and sounds terrible.

Unfortunately I don't have another carb I can get ahold of at the moment. While I was air leak testing I put soapy water inside the trans vent line and didn't see any bubbles. Based on research and videos, I would see bubbles if the transmission side crank seal was leaking. I also put propane to the trans vent line...

Checked float height 3 times. I have it set parallel to the sealing surface. I ordered a 58 and 60, will try those when they come in.

Sprayed soapy water all around engine and saw no bubbles. Put propane in stator area while running and it made no difference. The 55 is big, you're right. That's my problem. If I go any smaller it's heavy lean on the pilot. Needle clip is 3rd but that's not my problem. Only problem is hanging idle(lean) and popping on decel(lean)...