Engine misfire at idle - Kawasaki Versys Forum
 
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post #1 of 8 (permalink) Old 07-19-2019, 09:43 AM Thread Starter
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Angry Engine misfire at idle

G'day,

I've noticed lately the engine seems to cut out during idle??? I had a dealer top end re-build, de carbon, new vales & piston rings late last year. Iridium plugs are less than 2 years old + new stick coils. I serviced the air cleaner recently & checked the spark plug gap - all within spec. Idle speed is around 11,13000 & the misfire happens when the bike is hot. Running is fine, still goes like a rocket! Any ideas???

Last edited by fasteddiecopeman; 07-20-2019 at 01:01 PM.
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post #2 of 8 (permalink) Old 07-20-2019, 01:03 PM
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Originally Posted by Dave the Rave View Post
... Iridium plugs are less than 2 years old + new stick coils. I serviced the air cleaner recently & checked the spark plug gap - all within spec. Idle speed is around 11,13000 & the misfire happens when the bike is hot. Running is fine, still goes like a rocket! Any ideas???
How many MILES on your plugs? Just because they LOOK good and the gap is correct, doesn't mean that they ARE good. I assume your idle speed is 1,300rpm...?

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post #3 of 8 (permalink) Old 07-20-2019, 02:00 PM
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Originally Posted by Dave the Rave View Post
G'day,

I've noticed lately the engine seems to cut out during idle??? I had a dealer top end re-build, de carbon, new vales & piston rings late last year. Iridium plugs are less than 2 years old + new stick coils. I serviced the air cleaner recently & checked the spark plug gap - all within spec. Idle speed is around 11,13000 & the misfire happens when the bike is hot. Running is fine, still goes like a rocket! Any ideas???
Sounds like a possible TPS not set correctly, once off fast idle is off, if not set correctly it will lean out. Also if a sensor on the air box isn't plugged in it will do similar.
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post #4 of 8 (permalink) Old 07-21-2019, 02:23 AM
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How many kms since the top end rebuild of two years ago? Your valve lash clearances should now be measured and adjusted, along with new spark plugs and a throttle body vacuum synchronization (done at 1,300 rpm idle). A compression check while you're in there could confirm that the rings are well seated and the new valves not leaking.
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post #5 of 8 (permalink) Old 07-26-2019, 07:13 AM Thread Starter
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Invader,

9,000klms since the re-build & 11,00klms on the plugs. Is the valve lash & compression check really necessary??
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post #6 of 8 (permalink) Old 07-26-2019, 07:15 AM Thread Starter
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One Wizard,
TPS - that's out of my back yard capabilities I think! I have a booster plug fitted to try and smooth out the super lumpy low speed performance (only marginally successful I have to say).
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post #7 of 8 (permalink) Old 07-26-2019, 08:28 AM
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Invader,

9,000klms since the re-build & 11,00klms on the plugs. Is the valve lash & compression check really necessary??
The symptoms you provided could very well indicate valves that are too tight. Like Invader said, the compression check would be more of a peace of mind thing but also could provide diagnostic help.

I would check the valves before taking it somewhere to chase after electrics, adjusting the valves is part of a "tune up" and critical for other diagnostic work. It's kinda the first order of business in this case.

The mileage since rebuild would seem to be a bit low for "too tight valves" but you do have to rule it out and who knows if they were set properly in the first place. Do you have a shim map form the rebuild indicating what clearances the valves were set at?

Edit to add: And as long as you are in there, do replace the spark plugs.

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post #8 of 8 (permalink) Old 07-26-2019, 09:34 AM
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One Wizard,
TPS - that's out of my back yard capabilities I think! I have a booster plug fitted to try and smooth out the super lumpy low speed performance (only marginally successful I have to say).
The booster plug adjust fuel by fooling air temperature. In actual fact your bike is a MK-2, that TPS setting is very important , several have done the vacuum hose link, I found it to be dumping excessive fuel while engine braking and went back to the original vacuum line. Invader is the one who first posted it.
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