Idle Fluctuation

00NissanNinja · December 12th, 2010, 12:37 PM

All of a sudden my bike seems to be having an issue at idle. The idle goes to what it normally is (1500rpm) but every few seconds it jumps up by maybe about 250-400rpm while idling then heads back to normal idle (This is with the bike warmed and even after having a 20 or so mile ride). Do you think maybe the cabs are out of sync or the idle mixture needs to be adjusted? Thanks for the help much appreciated

kkim · December 12th, 2010, 01:57 PM

has the bike been left sitting unused for a period of time?

00NissanNinja · December 12th, 2010, 02:16 PM

Sort of, I only get to ride it once a week or every two weeks. It seems to be running fine otherwise. Think I should get some seafoam to make up for it being ridden less?

kkim · December 12th, 2010, 02:31 PM

drain the carb bowls, drain all the fuel in the tank and refill with fresh gas and some seafoam. if you're lucky, you might be able to flush the gunk in your carbs/tank out before they've solidified and save yourself from having to pull the carbs to clean them out from, what sounds to me, partially clogged pilot jets.

00NissanNinja · December 12th, 2010, 02:45 PM

Oh, that sucks lol, These carbs on these bikes good grief

...Alright I'll give it a shot thanks kkim. Hopefully I won't have to take them off and clean them.

cuong-nutz · December 19th, 2011, 04:27 PM

Quote:

Originally Posted by 00NissanNinja

Oh, that sucks lol, These carbs on these bikes good grief

...Alright I'll give it a shot thanks kkim. Hopefully I won't have to take them off and clean them.

Did you ever figure out what caused it? I'm having the same deal. Kind of annoying.

Link to original page on YouTube.

00NissanNinja · December 20th, 2011, 01:01 AM

@cuong-nutz I ran some seafoam through it and the idle got a bit better. But randomly sometimes the bike would idle and stabilize at a higher idle than normal. I just finished re jetting my bike and my idle is very stable now. While I was jetting I also found out that one of the idle mixture screws was turned out very little while the other was turned noticeably farther out (about 1.5 turns). That probably caused the issues I had as well. Syncing the carbs also wouldn't be a bad idea. Overall i think the issues were what kkim stated and the uneven idle mixture screws. I also checked the butteryfly operation on the carbs and they moved in sync (which somewhat verifies the carbs are in sync). Otherwise after jetting my bike its been the smoothest idling since I bought it.

coondog · December 20th, 2011, 06:38 AM

I have an 05 so maybe things are different, but 1500 is too high of an idle. Once you've gone your 20 miles and bike is good and heated up, adjust to 1300 and try that. No work involved and may be problem or part of problem at this point. Be thankful at worst it's a carb clean. Luck!

00NissanNinja · December 20th, 2011, 01:27 PM

1500 is where my bike works its best and is where quite a few people I have talked to have theirs idling at. My bike is fine now, I mean this was like a year a ago haha. It was still moody over the year, but fine the majority of the time. It idles very smooth now that I rejetted, messed with the idle mixture screws, and checked the carb sync.

cuong-nutz · December 20th, 2011, 02:30 PM

I'll give seafoam a try. I think it's been doing this since it was new. I remember when I rejetted, the right carb was like 3 turns out while he left was close to 2.5. Some guy said it could be a float issue but he did not not elaborate more. I don't have a vacuum leak as far as I know.

My bike runs better with the idle at 1500 as well and it was what most recommended.

00NissanNinja · December 20th, 2011, 11:08 PM

Quote:

Originally Posted by cuong-nutz

I'll give seafoam a try. I think it's been doing this since it was new. I remember when I rejetted, the right carb was like 3 turns out while he left was close to 2.5. Some guy said it could be a float issue but he did not not elaborate more. I don't have a vacuum leak as far as I know.

My bike runs better with the idle at 1500 as well and it was what most recommended.

Cool, give it a shot. If that doesn't help try messing with the idle screws some more.

cuong-nutz · December 20th, 2011, 11:23 PM

Yeah, I just dumped half a pint of Seafoam in a new full tank of gas. Hope it was worth the 8 dollars.

00NissanNinja · December 20th, 2011, 11:31 PM

Quote:

Originally Posted by cuong-nutz

Hope it was worth the 8 dollars.

Lol, that is exactly how I felt when I got some. It took awhile but the idle eventually stopped being very erratic when I used some.

December 12th, 2010, 12:37 PM	#1
00NissanNinja I hate driving... Name: S Location: SW Ohio Join Date: Jul 2010 Motorcycle(s): 13 Triumph Street Triple R, 09 Ninja 250r (Sold 4/20/12) Posts: A lot.	Idle Fluctuation All of a sudden my bike seems to be having an issue at idle. The idle goes to what it normally is (1500rpm) but every few seconds it jumps up by maybe about 250-400rpm while idling then heads back to normal idle (This is with the bike warmed and even after having a 20 or so mile ride). Do you think maybe the cabs are out of sync or the idle mixture needs to be adjusted? Thanks for the help much appreciated __________________________________________________ 09 ninja 2fiddy SE Driving slow things fast

December 12th, 2010, 02:16 PM	#3
00NissanNinja I hate driving... Name: S Location: SW Ohio Join Date: Jul 2010 Motorcycle(s): 13 Triumph Street Triple R, 09 Ninja 250r (Sold 4/20/12) Posts: A lot.	Sort of, I only get to ride it once a week or every two weeks. It seems to be running fine otherwise. Think I should get some seafoam to make up for it being ridden less? __________________________________________________ 09 ninja 2fiddy SE Driving slow things fast

December 12th, 2010, 02:45 PM	#5
00NissanNinja I hate driving... Name: S Location: SW Ohio Join Date: Jul 2010 Motorcycle(s): 13 Triumph Street Triple R, 09 Ninja 250r (Sold 4/20/12) Posts: A lot.	Oh, that sucks lol, These carbs on these bikes good grief...Alright I'll give it a shot thanks kkim. Hopefully I won't have to take them off and clean them. __________________________________________________ 09 ninja 2fiddy SE Driving slow things fast

December 20th, 2011, 01:01 AM	#7
00NissanNinja I hate driving... Name: S Location: SW Ohio Join Date: Jul 2010 Motorcycle(s): 13 Triumph Street Triple R, 09 Ninja 250r (Sold 4/20/12) Posts: A lot.	@cuong-nutz I ran some seafoam through it and the idle got a bit better. But randomly sometimes the bike would idle and stabilize at a higher idle than normal. I just finished re jetting my bike and my idle is very stable now. While I was jetting I also found out that one of the idle mixture screws was turned out very little while the other was turned noticeably farther out (about 1.5 turns). That probably caused the issues I had as well. Syncing the carbs also wouldn't be a bad idea. Overall i think the issues were what kkim stated and the uneven idle mixture screws. I also checked the butteryfly operation on the carbs and they moved in sync (which somewhat verifies the carbs are in sync). Otherwise after jetting my bike its been the smoothest idling since I bought it. __________________________________________________ 09 ninja 2fiddy SE Driving slow things fast Last futzed with by 00NissanNinja; December 20th, 2011 at 01:23 PM.

December 20th, 2011, 01:27 PM	#9
00NissanNinja I hate driving... Name: S Location: SW Ohio Join Date: Jul 2010 Motorcycle(s): 13 Triumph Street Triple R, 09 Ninja 250r (Sold 4/20/12) Posts: A lot.	1500 is where my bike works its best and is where quite a few people I have talked to have theirs idling at. My bike is fine now, I mean this was like a year a ago haha. It was still moody over the year, but fine the majority of the time. It idles very smooth now that I rejetted, messed with the idle mixture screws, and checked the carb sync. __________________________________________________ 09 ninja 2fiddy SE Driving slow things fast

December 12th, 2010, 01:57 PM	#2
kkim Join Date: Nov 2008 Posts: Too much.	has the bike been left sitting unused for a period of time?

December 12th, 2010, 02:31 PM	#4
kkim Join Date: Nov 2008 Posts: Too much.	drain the carb bowls, drain all the fuel in the tank and refill with fresh gas and some seafoam. if you're lucky, you might be able to flush the gunk in your carbs/tank out before they've solidified and save yourself from having to pull the carbs to clean them out from, what sounds to me, partially clogged pilot jets.

December 20th, 2011, 06:38 AM	#8
coondog ninjette.org sage Name: john Location: Palm Beach County, Fl Sligo County, Eire Join Date: Dec 2010 Motorcycle(s): 2005 ninja 250 street fighter, 2008 street fighter ninja 500, 2001 nsr 125 Posts: 812	I have an 05 so maybe things are different, but 1500 is too high of an idle. Once you've gone your 20 miles and bike is good and heated up, adjust to 1300 and try that. No work involved and may be problem or part of problem at this point. Be thankful at worst it's a carb clean. Luck!

December 20th, 2011, 02:30 PM	#10
cuong-nutz RIP Alex Name: Cuong Location: Houston, TX Join Date: Apr 2011 Motorcycle(s): '10 250r, '09 265r Posts: A lot. Blog Entries: 2	I'll give seafoam a try. I think it's been doing this since it was new. I remember when I rejetted, the right carb was like 3 turns out while he left was close to 2.5. Some guy said it could be a float issue but he did not not elaborate more. I don't have a vacuum leak as far as I know. My bike runs better with the idle at 1500 as well and it was what most recommended. __________________________________________________ HalfFast Racing Team Serving Greater Houston Area Riders:WFO Riders MotoHouston HPC CMRA Ride Smart Fastline Lone Star Track Days

December 20th, 2011, 11:23 PM	#12
cuong-nutz RIP Alex Name: Cuong Location: Houston, TX Join Date: Apr 2011 Motorcycle(s): '10 250r, '09 265r Posts: A lot. Blog Entries: 2	Yeah, I just dumped half a pint of Seafoam in a new full tank of gas. Hope it was worth the 8 dollars. __________________________________________________ HalfFast Racing Team Serving Greater Houston Area Riders:WFO Riders MotoHouston HPC CMRA Ride Smart Fastline Lone Star Track Days

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