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Idle too fast twin HS2
Posted: Wed May 25, 2016 1:55 pm
by 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.
Re: Idle too fast twin HS2
Posted: Wed May 25, 2016 2:00 pm
by 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?
Re: Idle too fast twin HS2
Posted: Wed May 25, 2016 3:09 pm
by les
Is there a screw holding the butterfly valve slightly open.
Re: Idle too fast twin HS2
Posted: Wed May 25, 2016 8:15 pm
by 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......