Is it advisable to turn off the fuel between rides?

Fish,
the bad starting...could it be the strength of the spark. i diagnosed my poor starting wrongly...renewed the rings to find the spark had disappeared due to knackered stator.
the usual bad starting of warm single cylinder 4-strokes is only due to stalling or falling off. normally if you turn it off it will start straight away. does seem odd that it does not when fuel tap is on. the float in the carb should cut the fuel off when the bowl is full. if this has dirt on the seat and is letting fuel in...it could be flooding your engine.
my way to start a flooded 4-stroke is to pull throttle fully open for 30 secs and release it to fully closed and then kick bike..it nearly always starts straight up. { by kicking bike...i meant operating the kick starter in the usual manner...not climbing off and putting boot through panels! just in case someone is pedantic about my mech lingo!!!}

the bike needs a LEAN set up when warm you sound rich. the atomiser and needle wear badly on the dell ortos and may/probably are the reason for the juicy situation.

also check that you have the fuel jet in your carb that some have found missing. for this go to the doc and carburation.

this should cover it.

regards

Taffy

.............additionally if your valves are too tight it will produce the symptoms that you describe.

Hi. I would check the kick lever and the intake rubber.
It´s very important how the lever is installed.

Best of luck to you.

Good news. If it's a Dellorto carb, where did you order the parts from?

loony

here you are: http://www.racecar.co.uk/dellorto/

i first dealt with them in 1980 undewr the name 'contact developments'.

fish: glad i was on the money, it'd been a good weekend for gettinng the jetting right.

regards

Taffy