SOHC.co.uk Forums > CB500/550

Motad too restrictive

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andy_c101:
I've got the opposite problem!
I've got four-into-four universal silencers (dunstall look-alikes) & she's running lean, & feels breatheless at 60mph.
I was thinking of trying to raise the jet needles in the Keihin carbs to richen the mix.
Anyone tried that? or is it case of neeing larger jets (currently size 90 main jets).

SteveD CB500K0:
It depends on what throttle opening the lean running is exhibited.

3/4 to full throttle = mains

1/4 to 3/4 = needle

Easier to start with the needles as you don't have to buy any parts!


Note the above is a simplification (Two Tired would shoot me!) - more details here

florence:
If running very lean, make sure you don't have any leaks between the carb and the engine.  I have had them suck air past the rubbers before and this make them run very lean.  I've got bigger main jets in mine, can't remeber what number but greater than 90.  For some reason 110 comes to mind but that could be erroneous.  Anyway, whatever it is, it was sluggish with the motad; now it pulls like a train.  I had considered changing the front sprocket down a tooth to lower the gearing.  Now no longer necessary.

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