Slight idle issue

NinjaNelly · April 24th, 2020, 04:55 AM

Hey guys, so i recently installed a k&n air filter and a slip on exhaust and When i took the bike out it was even more gutless than usual but i did some research on this forum and some others and found that shimming the needles should help my problem out quite a bit so yesterday i shimmed each needle with 2 washers 0.020 in thickness and the bike ran amazingly very responsive in the midrange and throughout with no power loss the only thing is now the bike comes back to idle very slowly and sometimes will jump around down there between 1.2k to 1.5 any ideas guys?

Triple Jim · April 24th, 2020, 05:48 AM

That normally points to either an air leak or a too-lean idle setting. If you're sure the carbs are seated in the rubber boots and the boots aren't cracked and leaking, see if an idle mixture adjustment cures it. Adjust the idle mixture screws for the highest idle speed.

Welcome to the board, Nelson!

ducatiman · April 24th, 2020, 06:50 AM

@Triple Jim right on the money, pilot screw adjust next on the hit parade

jkv45 · April 24th, 2020, 06:56 AM

As TJ and ducatiman suggested - adjust your idle mixture screws.

NinjaNelly · April 24th, 2020, 11:28 AM

Ok Im sure i dont have an air leak and i know the boots and slides are in good condition so i will give this a try tonight and let y’all know the outcome thank you all very much for the info and thanks for the welcome glad to be apart of this great community!!

jkv45 · April 24th, 2020, 12:33 PM

The general idea for setting the Idle Mixture screws is to get the highest hot idle speed as possible, even if both adjustments are not set exactly the same. Syncing the carbs is a good idea as well.

After getting the highest idle speed, I personally like to go about 1/8-turn out/richer, which seems to help smooth the transition to part-throttle metering.

NinjaNelly · April 28th, 2020, 02:37 PM

Hey guys so after drilling out those damn plugs that cover the idle mixture screws from factory and adjusting them as stated above by all of you i must say my idle issue has disappeared and the bike runs great now thank you all for your help!, and if i have anymore issues in the future i know where to go!

jkv45 · April 29th, 2020, 06:29 AM

Good to hear!

Seems they set them randomly from the factory.

As temps fluctuate you may need to make slight adjustments. Colder temps require a richer (more turns out) setting than warmer temps.

Always make your adjustments on a hot engine. You'll get good at keeping your hands off of the hot case as you make the adjustment. A properly sized screwdriver helps.

nocturncal · May 9th, 2020, 01:55 AM

Quote:

Originally Posted by jkv45

Good to hear!

Seems they set them randomly from the factory.

As temps fluctuate you may need to make slight adjustments. Colder temps require a richer (more turns out) setting than warmer temps.

Always make your adjustments on a hot engine. You'll get good at keeping your hands off of the hot case as you make the adjustment. A properly sized screwdriver helps.

For me they were set at 1 1/2 left and 1 1/4 right from factory. ��

April 24th, 2020, 04:55 AM	#1
NinjaNelly NinjaNelly Name: Nelson Location: Brampton ontario Join Date: Apr 2020 Motorcycle(s): 12 ninja 250, 74 Honda cb360 Posts: 3	Slight idle issue Hey guys, so i recently installed a k&n air filter and a slip on exhaust and When i took the bike out it was even more gutless than usual but i did some research on this forum and some others and found that shimming the needles should help my problem out quite a bit so yesterday i shimmed each needle with 2 washers 0.020 in thickness and the bike ran amazingly very responsive in the midrange and throughout with no power loss the only thing is now the bike comes back to idle very slowly and sometimes will jump around down there between 1.2k to 1.5 any ideas guys?

April 24th, 2020, 05:48 AM	#2
Triple Jim 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	That normally points to either an air leak or a too-lean idle setting. If you're sure the carbs are seated in the rubber boots and the boots aren't cracked and leaking, see if an idle mixture adjustment cures it. Adjust the idle mixture screws for the highest idle speed. Welcome to the board, Nelson!
	3 out of 3 members found this post helpful.

April 24th, 2020, 06:50 AM	#3
ducatiman ninjette.org certified postwhore Name: Gordon Location: new york Join Date: Sep 2009 Motorcycle(s): '95 DUCATI 900SS/SP '07 DUCATI SS800 '19 HONDA CBR650R Posts: A lot. MOTM - Nov '18, Mar '17	@Triple Jim right on the money, pilot screw adjust next on the hit parade __________________________________________________ gordon@customcarbservices.com Custom Carb Service www.customcarbservices.com
	1 out of 1 members found this post helpful.

April 28th, 2020, 02:37 PM	#7
NinjaNelly NinjaNelly Name: Nelson Location: Brampton ontario Join Date: Apr 2020 Motorcycle(s): 12 ninja 250, 74 Honda cb360 Posts: 3	Hey guys so after drilling out those damn plugs that cover the idle mixture screws from factory and adjusting them as stated above by all of you i must say my idle issue has disappeared and the bike runs great now thank you all for your help!, and if i have anymore issues in the future i know where to go!
	1 out of 1 members found this post helpful.

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April 24th, 2020, 06:56 AM	#4
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	As TJ and ducatiman suggested - adjust your idle mixture screws.

April 24th, 2020, 11:28 AM	#5
NinjaNelly NinjaNelly Name: Nelson Location: Brampton ontario Join Date: Apr 2020 Motorcycle(s): 12 ninja 250, 74 Honda cb360 Posts: 3	Ok Im sure i dont have an air leak and i know the boots and slides are in good condition so i will give this a try tonight and let y’all know the outcome thank you all very much for the info and thanks for the welcome glad to be apart of this great community!!

April 24th, 2020, 12:33 PM	#6
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	The general idea for setting the Idle Mixture screws is to get the highest hot idle speed as possible, even if both adjustments are not set exactly the same. Syncing the carbs is a good idea as well. After getting the highest idle speed, I personally like to go about 1/8-turn out/richer, which seems to help smooth the transition to part-throttle metering.

April 29th, 2020, 06:29 AM	#8
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	Good to hear! Seems they set them randomly from the factory. As temps fluctuate you may need to make slight adjustments. Colder temps require a richer (more turns out) setting than warmer temps. Always make your adjustments on a hot engine. You'll get good at keeping your hands off of the hot case as you make the adjustment. A properly sized screwdriver helps.