Rockstar Posted August 19, 2015 Share Posted August 19, 2015 I have a 1996 Yamaha YZF750r that's in truly good condition. On a cold start the choke needs to be engaged, no problem, the bike warms up and I can close the choke after a minute or so. The bike idles fine. I also noticed that even after I've ridden the bike for an hour, if I leave it sit for 10 minutes, then restart, I need to apply full choke otherwise the bike will stall. Plugs are clean, oil is clean and there's no hesitation (acceleration / deceleration is smooth) while riding. Just curious to know if anyone's experienced something similar and what to check for. Appreciate any suggestions! Link to comment Share on other sites More sharing options...
Moderator Cynic Posted August 19, 2015 Moderator Share Posted August 19, 2015 A lot of bikes do it. It prob means the mixture may be a little lean at idle (due to a pipe maybe, filters?).Once its running its fine just a little too lean to fire. Is it better on a smoking hot day? My TDR does it unless the weather is really warm.I certainly wouldn't worry. Check the plugs if it is bothering you. Colour of a nice smooth white coffee is what you want to see. Link to comment Share on other sites More sharing options...
Rockstar Posted August 20, 2015 Author Share Posted August 20, 2015 Thanks for the reply! Yes, the bike seems better on those smoking hot days. I'll pull the plugs and have a look. The person I purchased the bike from took really good care of it but I don't think anything's been done tune-up-wise so I plan on taking it to a professional for a once-over. cheers, Link to comment Share on other sites More sharing options...
blackhat250 Posted August 20, 2015 Share Posted August 20, 2015 The principal of a choke [ enricher] is that fuel vapour condences on the cold cylinder [ head/valves on a 4 stroke] [ barrel/piston in a 2 T.] Hence the need the richen the mixture when cold, ,, Link to comment Share on other sites More sharing options...
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