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 Very lumpy running at low revs....

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Brodhurst
Squinternotto
Squinternotto
Brodhurst


Posts : 8
Join date : 2023-12-30

Very lumpy running at low revs.... Empty
PostSubject: Very lumpy running at low revs....   Very lumpy running at low revs.... Icon_minitime1Sun Jan 21, 2024 8:48 am

Hi all, noob question here probably. My recently acquired GRiSO has done very few miles over the last 5 or so years according to MOT records and is very lumpy at start up and when running below 3/3.5 K revs, but absolutely sings higher up the rev range.

I've put higher octane fuel in so see if that helps it at all, and it ran much better on this but then on starting it again today - very lumpy again.

Might this be dirt in the fuel tank, before I go investigating other things like throttle bodies etc.....?

Thanks for your patience

Ed
2009 GRiSO 1200 8V
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper


Posts : 10299
Join date : 2013-05-29
Age : 67

Very lumpy running at low revs.... Empty
PostSubject: Re: Very lumpy running at low revs....   Very lumpy running at low revs.... Icon_minitime1Sun Jan 21, 2024 10:57 am

Are the plug caps arcing to earth? When was it last tuned properly? Is it rollerised?
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Brodhurst
Squinternotto
Squinternotto
Brodhurst


Posts : 8
Join date : 2023-12-30

Very lumpy running at low revs.... Empty
PostSubject: Re: Very lumpy running at low revs....   Very lumpy running at low revs.... Icon_minitime1Sun Jan 21, 2024 11:08 am

Hi Pete - it is rollerised, haven't checked the arcing but will do. Hasn't been tuned properly for a long time I reckon.......

Thanks
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper


Posts : 10299
Join date : 2013-05-29
Age : 67

Very lumpy running at low revs.... Empty
PostSubject: Re: Very lumpy running at low revs....   Very lumpy running at low revs.... Icon_minitime1Sun Jan 21, 2024 11:20 am

Well a full tune-up would be a good starting point. You'll need diagnostic software and a manometer and read up on what not to touch on the throttlebodies but it's a very simple procedure.

Yahu likes this post

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Brodhurst
Squinternotto
Squinternotto
Brodhurst


Posts : 8
Join date : 2023-12-30

Very lumpy running at low revs.... Empty
PostSubject: Re: Very lumpy running at low revs....   Very lumpy running at low revs.... Icon_minitime1Sun Jan 21, 2024 11:35 am

Thanks Pete - mucho appreciated
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Very lumpy running at low revs.... Empty
PostSubject: Re: Very lumpy running at low revs....   Very lumpy running at low revs.... Icon_minitime1

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