Warm Starts

[Rob Neal]

Have now completed the build of my A65. Originally a 1962 Star but at some point in its history fitted with a twin carb (Lightning) head.  Rebuild has been comprehensive, including electronic ignition.  With new carbs fitted and following the cold start sequence found here in the clubs posts it fires first kick from cold every time (really!!) then ticks over and revs nicely.  All good.  Only problem is I can't get it fire up with a warm/hot engine. With a warm engine it's fuel on, no choke, no tickling, part throttle, ignition on.  Take it just past TDC, a hefty swing. Nothing, no matter how many times I try.  Have tried many combinations of throttle/choke/tickling but no joy. Once the engine has cooled, starts first kick. Reluctant to take it out for a run in case it stalls and I can't start it again. Does anyone have a technique I can try or where I can buy some magic dust from?  Thanks. Rob

[DAVE BRADY]

Hi,

It may be worth trying a bit of choke and even a tickle.  The hot engine, whilst standing, could cause some of the fuel to evaporate so making for a weaker mix.

Dave.

[rhyatt]

Usually , hot starts can be difficult as the latent heat in the engine causes the fuel in the carb to vaporise whilst sitting after a run.
The 1st kick, socks in this cloud of fuel vapour and drowns the plug/s.
Simple cure really , give the twistgrip a 1/4 turn open then kick it , the extra air clears the cloud

[cornishbob]

many moons ago i had a t140. it sometimes didnt want to start whilst hot especially when there was someone watching.
the open throttle usually did the trick. a few kicks then a normal start but it again was dependant on how many people were there waiting for you to fail

[Rob Neal]

Thanks for the advice which I'll try when I'm next in the shed.  I suppose it's one of the fundamental laws of the universe - the ease of starting is inversely  proportional to the number of people watching!!

[cornishbob]

going back to my t140. we were all out for a ride. the little bugger wouldnt start and a wire burnt out.

one of the lads had a topbox full of washing machine wiring looms (why?) and we repaced the wire from it.

it went a stotter but from that moment on the bike was a hotpoint and everyone told everyone else