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September 28th, 2016, 04:02 PM
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#1 |
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ninjette.org member
Name: Pika
Location: Houston
Join Date: Sep 2016 Motorcycle(s): 250r Posts: 12
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4k Idle after carb cleaning
Hi,
Problem: 4k Idle after a clean start up. Rode around the block. No sign of it going down or up. Notes: - Before carb clean, needed choke to start up, rough idle, would die below 2k. - cleaned carbs, installed 2 shims per needle - installed everything back, all hoses back in place - starts easily now, but now jumps up to 4k and stays there. - took out shims, problem still there. - carb sync adjuster is all the way up. (we thought more air = rpm down?) - idle screw is NOT touching - choke NOT on - throttle cable shows slack, did the turn handle bars trick, the cable isn't super tight. Could be: (as per other threads) - vacuum leak - leak through boots (i did have a hella hard time getting carbs in and out) - valve adjustment - tight throttle cable, but it shows slack and the turn right/left trick didn't raise RPM Solution: - needed to tighten carb sync adjuster, then reset air mixture screws to about ~2 turns, its not perfect but it lowered the revs to now ~2k Thoughts? Bike is for sale after I get it fixed... sigh. Thank you for this forum for helping me through this Last futzed with by chibit89; September 29th, 2016 at 09:51 AM. |
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September 28th, 2016, 04:11 PM
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#2 |
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Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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I'm confused... what butterfly valve is all the way open?
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September 28th, 2016, 04:13 PM
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#3 | |
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ninjette.org member
Name: Pika
Location: Houston
Join Date: Sep 2016 Motorcycle(s): 250r Posts: 12
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Quote:
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September 28th, 2016, 04:18 PM
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#4 |
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Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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Often, high idles are caused by too much air (from a leak somewhere), not too little air.
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September 28th, 2016, 04:31 PM
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#5 |
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The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much.
MOTY 2015, MOTM - Nov '12, Nov '13
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It could be as simple as the idle was turned up due to carb condition. Have you tried simply turning the idle speed down?
__________________________________________________
Goal: Shake A Million Hands | Look through the corners | Track Day Prep | Closest track? | The Mid-Ohio School |
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September 28th, 2016, 04:36 PM
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#6 |
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Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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I think that's what he meant by "- idle screw is NOT touching".
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September 28th, 2016, 06:34 PM
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#7 | |
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ninjette.org member
Name: Pika
Location: Houston
Join Date: Sep 2016 Motorcycle(s): 250r Posts: 12
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Quote:
I'll try spraying starter fluid around boots, look for el leako. |
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September 29th, 2016, 09:38 AM
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#8 |
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ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012 Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2 Posts: 999
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Cables misadjusted? I've seen parts of the throttle lever/linkage hang up on the screw clamp.
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September 29th, 2016, 09:52 AM
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#9 |
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ninjette.org member
Name: Pika
Location: Houston
Join Date: Sep 2016 Motorcycle(s): 250r Posts: 12
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hey all,
needed to tighten carb sync adjuster, then reset air mixture screws to about ~2 turns, its not perfect but it lowered the revs to now ~2k i'm not 100% sure if it's running right but it starts and will idle at 2k. i'm happy for now, i will sync it (dont want to push my luck) but thanks all for the help. |
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October 1st, 2016, 12:08 PM
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#10 |
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ninjette.org member
Name: Ryan
Location: Madison
Join Date: May 2016 Motorcycle(s): 2012 Ninja 250r Posts: 37
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When I took apart my bike there was 1 single tube comming from the gas tank to the carb, some type of air bleed or something and the bike wouldnt run good. Check to make sure all your hoses are connected to the right places.
__________________________________________________
"The most important thing is to have a good relationship with the bike... you have to understand what she wants. " ~Valentino Rossi Understand, Unregistered ? |
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October 1st, 2016, 12:17 PM
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#11 | |
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Vintage Screwball
Name: B
Location: Washington
Join Date: Feb 2016 Motorcycle(s): 2011 Ninja 250, 2008 Ninja 250, 2019 KTM 1290SDR, 2017 FZ10 Posts: A lot.
MOTM - Mar '16
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Quote:
The carb sync adjuster is a small screw located between the carbs and has a spring on it. Don't mix the two up.
__________________________________________________
Goin' fast on slow bikes! 
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October 8th, 2016, 08:49 AM
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#12 | |
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ninjette.org member
Name: Pika
Location: Houston
Join Date: Sep 2016 Motorcycle(s): 250r Posts: 12
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Quote:
During the sync, we adjusted the "carb sync adjuster" even more and now i'm balanced. |
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