750 K5 choke

[TERRIBLEONE]

Afternoon all,
My bike doesn’t seem to need choke to start, and in fact the choke seems to have little/no effect until the lever is fully raised towards the tank at which point the bike will just shut down. I normally just start it and keep it idling on the throttle until warm or sometimes I will adjust idle screw until warm then back it off. It’s something that’s always made me curious as to why it is this way. I guess it would be nice to flick the choke lever up until it’s warm then back it off as necessary. Anyone able to shed light on what could be wrong? I’d have to double check but I’m 90% sure all jetting is standard. Thanks.

[philward]

What colour are the plugs? Are you running standard airbox/exhausts? What are float heights? Does it run ok at low revs under load? Just trying to get a bit more info to help with diagnosis

[TERRIBLEONE]

Hi mate, thanks for response. Standard exhausts (I think David silver 341 replicas), standard airbox and filter. Bike seems to run great once warm. No popping/farting. I guess it prefers to be rolled on the throttle a little at low revs instead of being snapped open but I assumed that’s fairly standard. Have synced carbs etc. Yet to do a plug check actually, though I should have done by now. I was pretty fussy when assembling the carbs so happy the slides are all functioning as they should. Ive done around 800miles since getting it running after being stood for years. Us import bike. Float heights were all set to 26mm if I remember correctly and double checked using the clear tube method.

[philward]

Sorry, been away and just seen your reply - hopefully more members will get involved with a diagnosis.
Stating the obvious, it sounds as though its rich. So plug colour check and if plugs are darker, its the slow running circuit - air screws/passage ways, primary jet size/blockage but from experience of trying to sort out the low speed running of my CR750 Rep, don't discount mains/needle positions as from previous posts on the subject (someone on here has a chart that showhow all the jets/circuits affect the running across the range) the needle position can also affect across the range.
I know that you will feel confident that all was checked and assembled as per spec but (and from personal experience!) there has to be something amiss - so a recheck of the carbs seems the starting point.