Idle too fast twin HS2

[froggiemoggie]

Idling at 1500 rpm despite slackening accelerator cable outer, and screwing idle stops right out? Mixture has been checked ok. One possibility, new jets were fitted.

[IslipMinor]

Is the choke fully in and not causing the high idle speed?

Have you got an air leak somewhere around the inlet manifold? Or no vacuum hose fitted?

[les]

Is there a screw holding the butterfly valve slightly open.

[bmcecosse]

Already answered elsewhere...... listen to the carbs with a tube, and slacken the joining link so both carbs can independently be adjusted for even 'hiss' on the listening tube. Or do the engine a favour and get a single 1.5" SU on a GOOD inlet manifold for more power and easier 'tuning'. The 'tiny twins' are scarcely any better than a single 1.25" SU......