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Old September 12th, 2021, 08:08 AM   #1
Brau110
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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?
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Old September 12th, 2021, 09:14 AM   #2
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One possibility is your cams are not timed properly.
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Old September 12th, 2021, 01:54 PM   #3
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Vacuum leak
Measure compression to verify your fix
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Old September 12th, 2021, 01:57 PM   #4
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Quote:
Originally Posted by DannoXYZ View Post
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.
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Old September 12th, 2021, 04:18 PM   #5
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Really severe vacuum leak?
Throws off MAP sensor.
Oh yeah, measure MAP sensor output voltage at idle.
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Old September 13th, 2021, 07:02 AM   #6
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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.
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Old September 13th, 2021, 09:17 AM   #7
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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.
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