Running rich??

casamere · Post by **casamere** » Tue Dec 06, 2016 5:05 am

My CA77 out on the road runs well but the plugs are black what do I need to do to the carb guys. Thanks.

Nick · Post by **Nick** » Wed Dec 07, 2016 5:31 pm

start by dropping the needle one notch (raising the clip), if that doesn't do it, drop the main jet size.
Ideally you want to determine at what throttle opening it's running rich and jet accordingly. Low throttle opening: slide cutaway/ pilot jet; mid-range: needle; top-end: main jet.

Choke is Off when lever is down.

Overly restrictive mufflers/air cleaner can cause richness.

casamere · Post by **casamere** » Fri Dec 09, 2016 4:15 am

Many thanks Nick will give that a go.

LOUD MOUSE · Post by **LOUD MOUSE** » Fri Dec 09, 2016 10:33 am

How is your timing and valve clearance?. ...............lm

Nick wrote:start by dropping the needle one notch (raising the clip), if that doesn't do it, drop the main jet size.
Ideally you want to determine at what throttle opening it's running rich and jet accordingly. Low throttle opening: slide cutaway/ pilot jet; mid-range: needle; top-end: main jet.

Choke is Off when lever is down.

Overly restrictive mufflers/air cleaner can cause richness.

casamere · Post by **casamere** » Fri Dec 09, 2016 2:25 pm

Valves ok as engine was rebuilt 18 months ago but have a new set of timing springs to go in. Will check carb while engine is out.

LOUD MOUSE · Post by **LOUD MOUSE** » Fri Dec 09, 2016 8:48 pm

Have many miles on the engine?. ..........lm

casamere wrote:Valves ok as engine was rebuilt 18 months ago but have a new set of timing springs to go in. Will check carb while engine is out.

casamere · Post by **casamere** » Sat Dec 10, 2016 4:04 am

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Running rich??

Running rich??