Quick Mikuni VM26 Carb Question

Ski_rush · 03-12-2019, 08:26 AM

Does anyone have a good (labeled) picture of inside of the Mikuni carb (top view)?

Can anyone confirm that there is an air mixture screw in there (next to the pilot jet) that can be adjusted (i.e., turned counter-clockwise to open a little)?

Thanks.

**JerryHawk250** · 03-12-2019, 08:58 AM

Here you go. same location as on a PZ30 carb. Turn counter clockwise to richen it up.

NzBrakelathes · 03-12-2019, 09:15 AM

Here a special tool for that very task

https://rover.ebay.com/rover/0/0/0?m...2F303079752722

Ski_rush · 03-12-2019, 09:16 AM

Thanks Jerry! That helped a ton. Doing the valve adjustment and oil change today. I still have to go through the bike and loctite everything; haven't that yet. We might get to 48 degrees tomorrow here (but 100% chance of rain).

**JerryHawk250** · 03-12-2019, 09:17 AM

Quote:

Originally Posted by NzBrakelathes

Here a special tool for that very task

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F30 3079752722

I wish I would of had that tool when I had the PZ30. Would of made tuning much easier. The carb I have now has the idle mixture screw on the side where it is easy to get to.

Ski_rush · 03-12-2019, 09:18 AM

Quote:

Originally Posted by NzBrakelathes

Here a special tool for that very task

https://rover.ebay.com/rover/0/0/0?m...2F303079752722

I don't think so. That's the tool to adjust the screw on the bottom of the carb. I asked if there was a screw inside. Are they the same screw? I wouldn't think so since the screw head in on the inside of the carb.

Ski_rush · 03-12-2019, 09:25 AM

Hmmm...now I'm confused. Now that I look at it, the screw in that picture from Jerry looks like it's on the bottom, but on outside of the PZ carb. The screw I'm talking about is on the inside (facing the bowl). It's right next to the pilot jet. If that wasn't a mixture screw, then that's not good for me...

**JerryHawk250** · 03-12-2019, 09:28 AM

Quote:

Originally Posted by Ski_rush

Hmmm...now I'm confused. Now that I look at it, the screw in that picture from Jerry looks like it's on the bottom, but on outside of the PZ carb. The screw I'm talking about is on the inside (facing the bowl). It's right next to the pilot jet. If that wasn't a mixture screw, then that's not good for me...

No screw on the inside the carb to fool with. Those are the pilot (slow jet) and main jets. Mixture screw is on the outside of the bowl. The tool NZ linked will work great for adjusting the mixture after the carb is installed on the bike.

Alpha Reign · 03-12-2019, 09:48 AM

I use this to tune my carb's air/fuel screw. Fits nicely.

Ariel Red Hunter · 03-12-2019, 01:37 PM

Quote:

Originally Posted by Ski_rush

I don't think so. That's the tool to adjust the screw on the bottom of the carb. I asked if there was a screw inside. Are they the same screw? I wouldn't think so since the screw head in on the inside of the carb.

That tool is used to adjust the idle fuel/air mixture screw, which is located in the U shaped notch in the float bowl cover, which is there to allow access to the idle mixture screw, which is actually in the carburetor body. It comes from the factory with a plug over it in order to satisfy the EPA demand that carburetors are tamper proof...ARH

Ski_rush · 03-12-2019, 02:13 PM

Quote:

Originally Posted by Ariel Red Hunter

That tool is used to adjust the idle fuel/air mixture screw, which is located in the U shaped notch in the float bowl cover, which is there to allow access to the idle mixture screw, which is actually in the carburetor body. It comes from the factory with a plug over it in order to satisfy the EPA demand that carburetors are tamper proof...ARH

Completely disregard this thread. I was wrong. Dumb mistake. However, here's the good news. I can now remove and install a carb in an Apollo in a matter of minutes now. And, I can easily install the choke assembly that connects to the manual lever located on the handlebar. And...I did change the main jet to a 115. So, I got more practice and I put a better jet in that what I previously did (120).

Audihuff · 03-12-2019, 03:46 PM

Quote:

Originally Posted by Alpha Reign

I use this to tune my carb's air/fuel screw. Fits nicely.

i just ordered this.. should make my life simpler

NzBrakelathes · 03-12-2019, 08:30 PM

Quote:

Originally Posted by Alpha Reign

I use this to tune my carb's air/fuel screw. Fits nicely.

Does that fit the Mikuni carb? I tried it on the Keihin and no go (one just like that)

Alpha Reign · 03-12-2019, 09:50 PM

Quote:

Originally Posted by NzBrakelathes

Does that fit the Mikuni carb? I tried it on the Keihin and no go (one just like that)

Yes, I have it on my mikuni. It has a little side to side play, but not enough to make it back out. It sure comes in handy!

NzBrakelathes · 03-12-2019, 10:49 PM

I thought about getting some made but the amount needed was like 300 pieces, also wondered if the vibrations might make it come out.
In the end I didn't bother and offered the adj tool instead. Keihin PZ30 doesn't accept this part and I couldn't find a suitable etc.

I left it just how it is and bought the tool instead.

03-12-2019, 08:26 AM	#1
Ski_rush Join Date: Feb 2017 Posts: 449	Quick Mikuni VM26 Carb Question Does anyone have a good (labeled) picture of inside of the Mikuni carb (top view)? Can anyone confirm that there is an air mixture screw in there (next to the pilot jet) that can be adjusted (i.e., turned counter-clockwise to open a little)? Thanks.
	0

03-12-2019, 08:58 AM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,555	Here you go. same location as on a PZ30 carb. Turn counter clockwise to richen it up. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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03-12-2019, 09:48 AM	#9
Alpha Reign Join Date: Aug 2018 Location: Ohio Posts: 131	I use this to tune my carb's air/fuel screw. Fits nicely. __________________ Hawk 250 Lithium Battery, Mikuni Carb 110 main jet, Bark Busters with Mirrors, Extended Mixture Screw, 428 O-ring Chain, 17-15/40 sprockets, Digital Cluster, Cycra YZ250F Skid Plate, Oil Cooler
	1

03-12-2019, 09:15 AM	#3
NzBrakelathes Join Date: Jun 2016 Location: Hell Posts: 2,408	Here a special tool for that very task https://rover.ebay.com/rover/0/0/0?m...2F303079752722
	1

03-12-2019, 09:16 AM	#4
Ski_rush Join Date: Feb 2017 Posts: 449	Thanks Jerry! That helped a ton. Doing the valve adjustment and oil change today. I still have to go through the bike and loctite everything; haven't that yet. We might get to 48 degrees tomorrow here (but 100% chance of rain).
	0

03-12-2019, 09:25 AM	#7
Ski_rush Join Date: Feb 2017 Posts: 449	Hmmm...now I'm confused. Now that I look at it, the screw in that picture from Jerry looks like it's on the bottom, but on outside of the PZ carb. The screw I'm talking about is on the inside (facing the bowl). It's right next to the pilot jet. If that wasn't a mixture screw, then that's not good for me...
	0

03-12-2019, 10:49 PM	#15
NzBrakelathes Join Date: Jun 2016 Location: Hell Posts: 2,408	I thought about getting some made but the amount needed was like 300 pieces, also wondered if the vibrations might make it come out. In the end I didn't bother and offered the adj tool instead. Keihin PZ30 doesn't accept this part and I couldn't find a suitable etc. I left it just how it is and bought the tool instead.
	2