Running rich.

Discuss mechanical problems here.
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Running rich.

Postby Johnno » Sat Aug 18, 2018 11:28 am

Hi guys,My MM is running rich.Pulled it apart and can see no significant wear(H1 SU).Standard needle,no wear marks.Choke is returning as it should.
Any ideas?
Power to your Pistons,Johnnydoome.

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Re: Running rich.

Postby myoldjalopy » Sat Aug 18, 2018 2:17 pm

On the the assumption that you have tried to adjust the mixture without success and that both the needle and jet are not worn, or the needle bent, or fitted incorrectly, then cleaning the suction chamber and piston carefully (do not use any emery or similar abrasive) may help if the piston is sticking a bit. Maybe the air cleaner is choked?

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Re: Running rich.

Postby RobThomas » Sat Aug 18, 2018 6:46 pm

Is it a 100 thou jet instead of a 90 thou one? BTDT!
Cardiff, UK

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