Scott,
       I'm wondering if it might be ignition related - just a guess
here but if it has a two coil ignition system (I assume it does) there
is the potential to have one coil going bad, affecting two cylinders,
but not the other two.
       I wouldn't think you'd have a 20 degree difference between the
exhaust pipes under normal circumstances.
       Full disclosure - I don't have a 4 cylinder NH - anyone want to
confirm / deny my thinking here?
       -Joey

On Mon, Apr 11, 2011 at 9:25 PM, Scott McKinley <[email protected]> wrote:
> The exhaust pipe temperatures read when sitting on the bike:
>
> L to Right:
>
> 149
>
> 147
>
> 129
>
> 121
>
> Power seems a little low at less than 3000 rpm, but above doesn’t miss and
> has plenty of power. Carburetors worked about 100 miles ago, use Seafoam
> over winter and ride about every two weeks for about an hour. Starts easy
> and idles without a problem once warmed up. Do I need to sync carbs or ?
>
> Thanks for any advise,
>
> Scott
>
>
>
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