New carb is screaming

Cuban1280 · 08-21-2017, 07:48 PM

Put the new carb on. Cranked it and the engine is at max rev. idk what the heck is going on. it's a mikuni.

Adjuster · 08-21-2017, 08:49 PM

Throttle cable not in correct position. Slide not installed correctly. Combo of both.

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Cuban1280 · 08-21-2017, 08:54 PM

ok. thanks. after work tomorrow I'll double check.

Azhule · 08-22-2017, 09:48 AM

Did you mess with/adjust any of the "adjustment screws" on the carb yet? Most of these cheapo carbs have 2 adjustments ("Idle speed" and "Pilot Jet" screws) that you will need to work out when it is installed on the engine.

Maybe the "Idle Speed" screw (on the side of the carb) needs a bit of adjusting still? If the cable and slide is good, maybe start the bike and slowly Lefty Loosey that screw until the Idle drops down, then adjust everything again when the engine is up to operating temps

Cuban1280 · 08-22-2017, 10:46 AM

I tried yesterday adjusting the one and only screw on the right side of the carb. it did nothing. I'll double check when I get home the throttle adjustment on the handle bar to see if that does anything.

Darth Racer · 08-22-2017, 11:36 AM

I had the same issue when I installed mine.

Check that the throttle cable didn't get twisted when you screwed the slide cap on.

If that doesn't work you may have to cut back some wraps on the cable casing so you can get more length on the exposed throttle cable. I cut back about 1/4"

Cuban1280 · 08-22-2017, 12:06 PM

after u mention it I did remember that the throttle cable did twist. I thought nothing of it until your comment. being such a tight space I was just glad to get it screwed on. I'll undo it and see if that remedies it.

Darth Racer · 08-22-2017, 09:32 PM

Yeah you want to make sure when the throttle isn't touched the slide is completely blocking off the main air intake.

If its open its gonna run high.

Darth Racer · 08-22-2017, 09:34 PM

What size jets are you using in the Mikuni?

pete · 08-23-2017, 05:15 AM

If you used the old cable with the new carb it could well be that
the old cable is not compatable with the new carb..
cables travel is to short which would hold the slide slightly open...
On a unloaded motor it dosn't have to be open very much to make
it run at very high rpm's..

wined all the cable adjuster in at both ends.. see if that helps any...

PS... don't get into the jets yet..this issue has nothing to do with them..

..

Cuban1280 · 08-23-2017, 06:31 AM

My cousin actually did me a favor and fixed it while I was at work to save me time. I'm not sure what he did but I did mention cutting back some on the cable sleeve. I believe that took care of it. It does run and idle perfect. Thanks for all the help and tips from everyone. I'm definitely not done with upgrades. Many more to come. Work is picking up so my time with the bikes has slowed down.

Darth Racer · 08-23-2017, 01:42 PM

Glad to hear your running... enjoy the extra torque and pep!!!

Cuban1280 · 08-23-2017, 03:01 PM

huge difference. a lot more torque of the bat without the gears. I'm ordering the gears tonight.

2LZ · 08-23-2017, 05:17 PM

Yah...sometimes the end of the cable won't sit all the way down in the slide cap. Happened to mine. A little relieving and it'a sall good. Glad to hear you're making good progress!

These Rhino's may not be the cats meow of the atv world, but for the money, you can't beat 'em. They can take a hell of a thrashing.

Cuban1280 · 08-23-2017, 06:23 PM

My cousin said he had to change the drop set of the needle. He said it was at the highest setting.

08-21-2017, 07:48 PM	#1
Cuban1280 Join Date: Aug 2017 Location: Western NY Posts: 22	New carb is screaming Put the new carb on. Cranked it and the engine is at max rev. idk what the heck is going on. it's a mikuni.
	0

08-22-2017, 09:48 AM	#4
Azhule Join Date: Dec 2015 Location: CO Posts: 1,525	Did you mess with/adjust any of the "adjustment screws" on the carb yet? Most of these cheapo carbs have 2 adjustments ("Idle speed" and "Pilot Jet" screws) that you will need to work out when it is installed on the engine. Maybe the "Idle Speed" screw (on the side of the carb) needs a bit of adjusting still? If the cable and slide is good, maybe start the bike and slowly Lefty Loosey that screw until the Idle drops down, then adjust everything again when the engine is up to operating temps __________________ "Think as you like... but this self proclaimed Professor is always right" - Buckshot "You never know what someone is hiding beneath their smile..." - NinjaTom - R.I.P.
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08-23-2017, 05:15 AM	#10
pete Join Date: Jan 2012 Location: ChCh , NZ Posts: 2,261	If you used the old cable with the new carb it could well be that the old cable is not compatable with the new carb.. cables travel is to short which would hold the slide slightly open... On a unloaded motor it dosn't have to be open very much to make it run at very high rpm's.. wined all the cable adjuster in at both ends.. see if that helps any... PS... don't get into the jets yet..this issue has nothing to do with them.. .. __________________ 09 XT660R ... 06 TTR250 ... 80 Montesa H6 125 Enduro... 77 Montesa Cota 348 MRR "Malcom Rathnell Replica"... Current resto projects.. 81 Honda CT110... 80 Kawasaki KL250A1... 11 Husaburg TE125 enduro... "sold" along with another 31... Lifan 125 Pitbike.. "stolen" ... KIWI BIKER FORUM...... http://www.kiwibiker.co.nz/forums/content.php All the best offroad rides in NZ... http://www.remotemoto.com/ E-mail... xtpete1@gmail.com
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08-23-2017, 05:17 PM	#14
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,075	Yah...sometimes the end of the cable won't sit all the way down in the slide cap. Happened to mine. A little relieving and it'a sall good. Glad to hear you're making good progress! These Rhino's may not be the cats meow of the atv world, but for the money, you can't beat 'em. They can take a hell of a thrashing. __________________ "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
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08-21-2017, 08:49 PM	#2
Adjuster Join Date: Dec 2014 Location: Deerfield Beach FL Posts: 1,410	Throttle cable not in correct position. Slide not installed correctly. Combo of both. /
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08-21-2017, 08:54 PM	#3
Cuban1280 Join Date: Aug 2017 Location: Western NY Posts: 22	ok. thanks. after work tomorrow I'll double check.
	0

08-22-2017, 10:46 AM	#5
Cuban1280 Join Date: Aug 2017 Location: Western NY Posts: 22	I tried yesterday adjusting the one and only screw on the right side of the carb. it did nothing. I'll double check when I get home the throttle adjustment on the handle bar to see if that does anything.
	0

08-22-2017, 11:36 AM	#6
Darth Racer Join Date: Apr 2016 Location: MD Posts: 558	I had the same issue when I installed mine. Check that the throttle cable didn't get twisted when you screwed the slide cap on. If that doesn't work you may have to cut back some wraps on the cable casing so you can get more length on the exposed throttle cable. I cut back about 1/4"
	1

08-22-2017, 12:06 PM	#7
Cuban1280 Join Date: Aug 2017 Location: Western NY Posts: 22	after u mention it I did remember that the throttle cable did twist. I thought nothing of it until your comment. being such a tight space I was just glad to get it screwed on. I'll undo it and see if that remedies it.
	0

08-22-2017, 09:32 PM	#8
Darth Racer Join Date: Apr 2016 Location: MD Posts: 558	Yeah you want to make sure when the throttle isn't touched the slide is completely blocking off the main air intake. If its open its gonna run high.
	0

08-22-2017, 09:34 PM	#9
Darth Racer Join Date: Apr 2016 Location: MD Posts: 558	What size jets are you using in the Mikuni?
	0

08-23-2017, 06:31 AM	#11
Cuban1280 Join Date: Aug 2017 Location: Western NY Posts: 22	My cousin actually did me a favor and fixed it while I was at work to save me time. I'm not sure what he did but I did mention cutting back some on the cable sleeve. I believe that took care of it. It does run and idle perfect. Thanks for all the help and tips from everyone. I'm definitely not done with upgrades. Many more to come. Work is picking up so my time with the bikes has slowed down.
	3

08-23-2017, 01:42 PM	#12
Darth Racer Join Date: Apr 2016 Location: MD Posts: 558	Glad to hear your running... enjoy the extra torque and pep!!!
	1

08-23-2017, 03:01 PM	#13
Cuban1280 Join Date: Aug 2017 Location: Western NY Posts: 22	huge difference. a lot more torque of the bat without the gears. I'm ordering the gears tonight.
	1

08-23-2017, 06:23 PM	#15
Cuban1280 Join Date: Aug 2017 Location: Western NY Posts: 22	My cousin said he had to change the drop set of the needle. He said it was at the highest setting.
	0