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scotto75 |
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scotto75 Renault 5 Driver
Joined: 13 Mar 2016 Karma :
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Posted: 18:20 - 05 Oct 2023 Post subject: EFI revs hanging |
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Hi everyone,
My neighbour has a 2020 125cc Mutt and the revs are hanging for 2 seconds after the throttles returned. It starts and idles perfectly. No backfiring. There’s a slight hesitation when accelerating, but nothing untoward. It’s just that whether you return the throttle or put in the clutch, the revs stay at that rev range for 2 - 3 secs before dropping down to idle.
Don’t know much about Mutt’s except it’s a GN125 engine. I’m a carb and points type of a guy and this is all electronic, fuel injection and ECU type nonsense.
My thoughts were that it is running lean so I removed the spark plug. The ceramic was clean and the ground electrode was white, so I’m pretty confident that’s the issue.
I’ve sprayed easy-start around the manifold where the injector and throttle body are mounted, but no signs of air leaks. There’s no warning lights or the speedo and, as mentioned above, it idles and runs really nice.
Could the injector need a clean? It’s been sat around for a few months so suggested sticking a bottle of fuel treatment in the tank maybe?
Any other ideas would be most useful! Thanks! ____________________ Honda ‘73 CB350, ‘80 CG125, ‘88 CG125, '73 Triumph T140V |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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scotto75 |
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scotto75 Renault 5 Driver
Joined: 13 Mar 2016 Karma :
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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Robby |
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Robby Dirty Old Man
Joined: 16 May 2002 Karma :
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WD Forte |
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WD Forte World Chat Champion
Joined: 17 Jun 2010 Karma :
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