Ninja 300 Rough idle

Brau110 · September 12th, 2021, 08:08 AM

I have a 2013 Ninja 300. Did a top end install as I had lost compression. Put it back together and it now starts but it takes a little bit to start. Then once it starts it won’t idle unless you hold the throttle and it runs a little rough. No ticking just doesn’t run smooth or idle. Now it won’t rev past 1000rpm with throttle usage. Any ideas?

Triple Jim · September 12th, 2021, 09:14 AM

One possibility is your cams are not timed properly.

DannoXYZ · September 12th, 2021, 01:54 PM

Vacuum leak
Measure compression to verify your fix

Triple Jim · September 12th, 2021, 01:57 PM

Quote:

Originally Posted by DannoXYZ

Vacuum leak
Measure compression to verify your fix

I would think a vacuum leak would be most pronounced at low throttle and fairly insignificant at high throttle. Brou110 says he can't get it over 1,000 RPM even when he opens the throttle.

DannoXYZ · September 12th, 2021, 04:18 PM

Really severe vacuum leak?
Throws off MAP sensor.
Oh yeah, measure MAP sensor output voltage at idle.

jkv45 · September 13th, 2021, 07:02 AM

Because you did top-end work - I'd start there.

As noted, check the cam timing. Also check valve clearances.

Something isn't assembled/adjusted properly.

DannoXYZ · September 13th, 2021, 09:17 AM

Also measure all sensors and their wiring:

- IAT and continuity of wire between sensor and ECU connector
- ECT and continuity of wire between sensor and ECU connector
- MAP and continuity of wire between sensor and ECU connector
- TPS and continuity of wire between sensor and ECU connector
- Altitude sensor and continuity of wire between sensor and ECU connector
- tip-over sensor and continuity of wire between sensor and ECU connector

Something's different between when you disassembled engine vs. after re-assembly.

September 12th, 2021, 08:08 AM	#1
Brau110 ninjette.org newbie Name: Brandon Location: Sioux Falls Join Date: Sep 2021 Motorcycle(s): Kawasaki 650, 300 Posts: 1	Ninja 300 Rough idle I have a 2013 Ninja 300. Did a top end install as I had lost compression. Put it back together and it now starts but it takes a little bit to start. Then once it starts it won’t idle unless you hold the throttle and it runs a little rough. No ticking just doesn’t run smooth or idle. Now it won’t rev past 1000rpm with throttle usage. Any ideas?

September 12th, 2021, 09:14 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	One possibility is your cams are not timed properly.
	1 out of 1 members found this post helpful.

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September 12th, 2021, 01:54 PM	#3
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Vacuum leak Measure compression to verify your fix

September 12th, 2021, 04:18 PM	#5
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Really severe vacuum leak? Throws off MAP sensor. Oh yeah, measure MAP sensor output voltage at idle.

September 13th, 2021, 07:02 AM	#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	Because you did top-end work - I'd start there. As noted, check the cam timing. Also check valve clearances. Something isn't assembled/adjusted properly.

September 13th, 2021, 09:17 AM	#7
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Also measure all sensors and their wiring: - IAT and continuity of wire between sensor and ECU connector - ECT and continuity of wire between sensor and ECU connector - MAP and continuity of wire between sensor and ECU connector - TPS and continuity of wire between sensor and ECU connector - Altitude sensor and continuity of wire between sensor and ECU connector - tip-over sensor and continuity of wire between sensor and ECU connector Something's different between when you disassembled engine vs. after re-assembly.