SOHC.co.uk Forums > CB350/400

400/4 struggles to pick up when warm

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adriangsmith:
cheers all, will get on that today. plugs and caps sound like a possibility.
Been through most of the simple stuff already.
The guy who set up the carbs is an ex Honda mechanic and SOHC 4 and CBX1000 specialist so i trust him explicitly as its now running a lot better than it was before.
What are everyone's recommendations for plugs?

Nurse Julie:
D7EA 

Northy:
Watch out Adrian I'm  on here now ! :-), Is still not running better , best check all those HT leads and caps.   

ttr400:
D8EA. Std.

As a rule, Run the coldest plugs possible, without fouling.

For fast track full throttle running i use D9EA or even D10EA's

Kevin

K2-K6:
If it's running lean it should respond to a little choke when not accelerating,  which would confirm a lean diagnosis.

As Kevin has said,  I'd be careful with running a lower number NGK plug if you suspect it's lean at the moment to avoid overheating the plug.

Did the engine come to you built or have you worked inside it at all?

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