Author Topic: Cb360/390 pickup hesitation when fully hot  (Read 108 times)

Offline Sderbyshire

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  • Into Sailing, classic Triumph cars and motorbikes.
Cb360/390 pickup hesitation when fully hot
« on: Sep 16, 2018, 05:56:31 »
Hi folks, seeking some carb setting advice.

My cb360/390 is running beautifully, starts well, idles well, pulls to 10k in every gear :-)

I can get a solid idle at around 1200 revs too.

However when the bike is fully HOT after a good blast and i stop at a junction, then the engine hesitates and may even stall on pickup.

Eg, i open the throttle a tiny bit to pick up the idle speed ready to let the clutch out, and there’s a drop in revs and even a stall. It does this in neutral too so its not a clutch drag issue.

Being as this is happening only when the engine is hot, have i set the idle mixture too rich and this is causing the issue, i do seem to need 2 turns out on the left carb and more like 3 on the right carb to get the solid idle.