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 Carb Adjustment 
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MMT Pro Member

Joined: Thu Jul 05, 2012 12:39 pm
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Location: Delacroix Marsh
Post Carb Adjustment
Hey guys, I was wondering if anyone knew how to adjust a carb on a stock MB 35 HD Sport?

PM me or just reply

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1651 Excel Viper W/ MB HD 35 Stage 2


Sat Jul 14, 2012 3:04 pm
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Joined: Fri Dec 18, 2009 8:10 pm
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Location: Rowlett, TX
Post Re: Carb Adjustment
Why do you think it needs adjustment? What are your symptoms?


Sat Jul 14, 2012 3:18 pm
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Post Re: Carb Adjustment
It kills when I put it in gear.

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Sat Jul 14, 2012 4:22 pm
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Post Re: Carb Adjustment
What does it idle at out of gear? If you give it a little gas, it stays running?


Sat Jul 14, 2012 4:28 pm
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Post Re: Carb Adjustment
1100 - 1200 out of gear, yes it stays running.

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Sat Jul 14, 2012 5:01 pm
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Location: Rowlett, TX
Post Re: Carb Adjustment
That sounds about right. How high are you having to rev it up to keep it running? Has it ever run properly?

If it has run properly before, I would start with a good cleaning. Drop the bowl, remove the jets, clean them out real well.

Deadbird8 has posted pictures of the linkage and how to adjust the carb on a bunch of different posts. If a good cleaning doesn't help you out, you may dig through some of his posts and see if you can find any help there. Keywords, governor, black caps, adjustment, adjust, etc.


Sat Jul 14, 2012 5:15 pm
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Location: Delacroix Marsh
Post Re: Carb Adjustment
Thanks cb that was very helpful. I will try that

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Sat Jul 14, 2012 6:58 pm
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Post Re: Carb Adjustment
Has this been happening since the motor was new or did it just start?

A couple of things to try- First, the black caps on the top of the carb adjust the idle air mix on each cylinder. There are limiters on the caps so you have a small range to adjust them. Make note of the position of the screw on each side and adjust them with a small screwdriver so idle smooth. If idle is already smooth and the motor doesn't kill when you come off the throttle quickly then adjust the governed idle spring.

Try bending this tab a little (minor adjustment). It puts tension on the governed idle spring which sets the low point the throttle will drop when put under instantaneous load. Doing it while on the water allows you to test immediately so bring gloves (muffler is hot) and a tool to bend it (long needle nose).

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Sun Jul 15, 2012 4:19 am
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Post Re: Carb Adjustment
Thanks for your help deadbird, I looked at some of your old posts and i think I fixed the problem.

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Sun Jul 15, 2012 7:43 am
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Post Re: Carb Adjustment
So what was it ?

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Sun Jul 15, 2012 7:47 am
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Post Re: Carb Adjustment
I just had to adjust the gov and now it runs like a charm

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1651 Excel Viper W/ MB HD 35 Stage 2


Sun Jul 15, 2012 10:37 am
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