SOHC.co.uk Forums > CB350/400

400/4 carb flat spot

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NE0:
well folks it passed the test. nice new MOT.

Took it for a spin and the flat spot seems to be resolved, got a bit of a tune up to do though!
will retighten the head tomorrow and then do the tappets.
Nice and quiet now, amazing what a new primary and can chain can do!

K2-K6:
That's good news on both counts then for the Mot pass and still have the flat spot missing.

As a point of reference for anyone who subsequently looks up this thread about flat spots; one of the few minor adjustments you are given to trim this area of running is the idle screws as the manual gives the start point but it is fairly normal to tweak this to get what you need for your bike to run well in the ambient conditions you have.

As you've indicated the problem has been there for years and I certainly remember people trying to ride round this in the past, it's one of the most annoying places to have that poor response so if you ca trim it out it's well worthwhile.

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