Mikuni carb on Rhino

SilverBullet51 · 04-11-2017, 10:11 PM

Hey guys, just put a vm26 on my rhino and I'm running into some tuning issues. I've been reading on the forums for a while, and have done some searching. I have the 115 main, 30 pilot combo, seems to be what everyone is running. I'm at about 900ft. The quad seems to be running pretty good, besides it seems to hang in the revs if I blip the throttle off idle. I tried taking the pilot screw out another 1/4 turn but it still hangs, any ideas?

Darth Racer · 04-11-2017, 11:34 PM

Check your throttle cable. It's possible its bound up and keeping the cable from moving freely. Look for sharp turns in the cable that is usually where the cable has the most friction.

SilverBullet51 · 04-12-2017, 09:36 AM

Hey Darth, thanks for the idea, checked the cable and it moves freely, the slide moves up and down as it should, and it doesn't do it with the stock carb on.... Any other ideas?

**JerryHawk250** · 04-12-2017, 10:06 AM

Sounds like an intake leak. Make sure that you have a good seal between the carb and intake manifold. Check that the o-ring is thick enough to make a seal. Good way to check is t spray started fluid around the connection while it's running. If there's a leak the engine will rev.

SilverBullet51 · 04-12-2017, 10:39 AM

I kinda thought that might be the case, thanks for the suggestion I'll give that a try.

**JerryHawk250** · 04-12-2017, 10:42 AM

Quote:

Originally Posted by SilverBullet51

I kinda thought that might be the case, thanks for the suggestion I'll give that a try.

I can remember someone else on here had this issue and it turned out to be the groove that the o-ring sits in was deeper than it should of been.

2LZ · 04-12-2017, 12:19 PM

Also, check to make sure that the throttle cable sits all the way down inside the slide cap. Sometimes those aren't the same size. The cable sheath metal end is a little fatter than the hole in the slide cap.

SilverBullet51 · 04-12-2017, 06:23 PM

Ok tried the starter fluid, I doused it around the manifold, no change in idle.... Tried moving the c clip on the needle up and the quad felt weak, tried moving it down and it was definitely fat... Checked to make sure the cable end was all the way in and it fits like a glove... Still have the hanging revs, it only hangs for a second then drops back down. The part that bothers me is when I slow after going 3/4 throttle or so the engine stays reved as I'm slowing down...

2LZ · 04-12-2017, 06:42 PM

Quote:

Originally Posted by SilverBullet51

Ok tried the starter fluid, I doused it around the manifold, no change in idle.... Tried moving the c clip on the needle up and the quad felt weak, tried moving it down and it was definitely fat... Checked to make sure the cable end was all the way in and it fits like a glove... Still have the hanging revs, it only hangs for a second then drops back down. The part that bothers me is when I slow after going 3/4 throttle or so the engine stays reved as I'm slowing down...

Thanks for the update. How many total turns do you have the idle mixture screw set at? Also, are you running the stock exhaust? The 115/30 may be a bit fat for it. Are you still running the stock air filter? If so, take the air filter off and see if it makes a difference. That stock filter is garbage.

SilverBullet51 · 04-12-2017, 06:56 PM

Thanks for the reply 2LZ, I have the mixture screw out 1&3/4 turns. I have a pod filter I bought off Amazon like the k&n style. And I'm running stock exhaust... It feels like it runs strong from off idle and up, just wants to hang the revs. I backed off my idle speed screw and it seemed to have help, but then it wants to constantly stall. Wish my hands weren't so fat, I can't get them in there with it warm, I'll be cooking bacon.

SilverBullet51 · 04-12-2017, 10:20 PM

Quote:

Originally Posted by 2LZ

Thanks for the update. How many total turns do you have the idle mixture screw set at? Also, are you running the stock exhaust? The 115/30 may be a bit fat for it. Are you still running the stock air filter? If so, take the air filter off and see if it makes a difference. That stock filter is garbage.

If 115/30 is too fat for stock exhaust, what jets do you recommend? I've got a whole bag of them I can try, just need pointed in the right direction. Thanks for the help so far guys!

2LZ · 04-13-2017, 11:12 AM

Quote:

Originally Posted by SilverBullet51

If 115/30 is too fat for stock exhaust, what jets do you recommend? I've got a whole bag of them I can try, just need pointed in the right direction. Thanks for the help so far guys!

I think I'm currently running a 110/25 setup in my wife's TT250...which is still a CG motor. I'm at 3000' but it runs dang good and it has aftermarket exhaust and intake. Try that and see what you think. I run all of our needle clips in all of our CG's at the fourth notch down (lifting the needle slightly).

beyondhonesty · 04-13-2017, 12:19 PM

Rookie question, is a vm26 carb the same as a pz30 carb?

2LZ · 04-13-2017, 01:00 PM

Quote:

Originally Posted by beyondhonesty

Rookie question, is a vm26 carb the same as a pz30 carb?

Nope, similar though. The VM26 is a Mikuni (clone) and the PZ is a Keihin (clone).

04-11-2017, 10:11 PM	#1
SilverBullet51 Join Date: Apr 2017 Location: Plainwell, MI Posts: 60	Mikuni carb on Rhino Hey guys, just put a vm26 on my rhino and I'm running into some tuning issues. I've been reading on the forums for a while, and have done some searching. I have the 115 main, 30 pilot combo, seems to be what everyone is running. I'm at about 900ft. The quad seems to be running pretty good, besides it seems to hang in the revs if I blip the throttle off idle. I tried taking the pilot screw out another 1/4 turn but it still hangs, any ideas?
	1

04-12-2017, 10:06 AM	#4
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,723	Sounds like an intake leak. Make sure that you have a good seal between the carb and intake manifold. Check that the o-ring is thick enough to make a seal. Good way to check is t spray started fluid around the connection while it's running. If there's a leak the engine will rev. __________________ 2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 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
	1

04-12-2017, 12:19 PM	#7
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,112	Also, check to make sure that the throttle cable sits all the way down inside the slide cap. Sometimes those aren't the same size. The cable sheath metal end is a little fatter than the hole in the slide cap. __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
	1

04-13-2017, 12:19 PM	#13
beyondhonesty Join Date: Apr 2017 Posts: 20	Rookie question, is a vm26 carb the same as a pz30 carb? __________________ 12/2016 Rhino 250
	0

04-11-2017, 11:34 PM	#2
Darth Racer Join Date: Apr 2016 Location: MD Posts: 558	Check your throttle cable. It's possible its bound up and keeping the cable from moving freely. Look for sharp turns in the cable that is usually where the cable has the most friction.
	1

04-12-2017, 09:36 AM	#3
SilverBullet51 Join Date: Apr 2017 Location: Plainwell, MI Posts: 60	Hey Darth, thanks for the idea, checked the cable and it moves freely, the slide moves up and down as it should, and it doesn't do it with the stock carb on.... Any other ideas?
	0

04-12-2017, 10:39 AM	#5
SilverBullet51 Join Date: Apr 2017 Location: Plainwell, MI Posts: 60	I kinda thought that might be the case, thanks for the suggestion I'll give that a try.
	0

04-12-2017, 06:23 PM	#8
SilverBullet51 Join Date: Apr 2017 Location: Plainwell, MI Posts: 60	Ok tried the starter fluid, I doused it around the manifold, no change in idle.... Tried moving the c clip on the needle up and the quad felt weak, tried moving it down and it was definitely fat... Checked to make sure the cable end was all the way in and it fits like a glove... Still have the hanging revs, it only hangs for a second then drops back down. The part that bothers me is when I slow after going 3/4 throttle or so the engine stays reved as I'm slowing down...
	1

04-12-2017, 06:56 PM	#10
SilverBullet51 Join Date: Apr 2017 Location: Plainwell, MI Posts: 60	Thanks for the reply 2LZ, I have the mixture screw out 1&3/4 turns. I have a pod filter I bought off Amazon like the k&n style. And I'm running stock exhaust... It feels like it runs strong from off idle and up, just wants to hang the revs. I backed off my idle speed screw and it seemed to have help, but then it wants to constantly stall. Wish my hands weren't so fat, I can't get them in there with it warm, I'll be cooking bacon.
	1