Frans,
I had the same problem, albeit it occurred no matter if the engine was shut off
for 15 minutes or an hour.
When my carburettors were rebuild last winter by Bert Spreuwenberg, it turned
out
that the seals were due (the engine was built in 1999). Though unexpected for
me that solved the problem completely. I only open the throttle an inch or
so for warm start and it fires and runs immediately. I hope it remains that way
in summer when temperatures rise further.
I also found out, that I don't need choke even after hours parking and even at
cold temperatures only for a few seconds.
Maybe I'm just only lucky but I wish you the same.
Roland
XS Trigear 914
PH-ZTI
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