HS2 butterflies. Spit Mk3.

[SpitfireGeorge]

Hi Guys  

I cannot get the tickover below 1000 rpm even with all linkages loose and screws backed right out. Do the butterflies have a right way round or can they be fitted back to front not seating properly allowing too much air in at tickover?

Cheers,

Brett

 

[Steve P]

They should have a chamfer on one side to allow them to seat, so yes they do have a right way round. 

S

[SpitfireGeorge]

Thanks Steve I will check that out.

Cheers Brett

[Pete Lewis]

if this has a semi sealed breather system check there are no leaks even the oil filler cap etc 

any stray air will up the idle , 

and certainly agree the plates can be fitted back to front and the non chamfered edge wont close to to control the idle

if you take the carb off and look through there should be no daylight around the plates with the idle unscrewed 

Pete

[SpitfireGeorge]

Thanks Pete.

[DanMi]

also check for wear in the throttle spindles where the pass through the body