Honda Sky SGX 50 very difficult to start

Hi, have posted previously here recently about my SGX 50 (Honda Sky) and received some good advice on an electrical problem. I now have another problem so I am back for more help please!

Background is that I purchased as a non runner a few months ago. Eventually identified problem as crank seals which I changed then she fired up on second kick. Then had to change the regulator/rectifier as was blowing the headlights. All seemed fine. Took the bike on it's first real run on the road a for a few miles to the MOT test centre.

Passed MOT but garage said they had a lot of trouble starting her up. Tis seemed strange as she had been started from cold loads of times, always first or second kick. Indeed she wouldn't start on kick when I picked her up but did eventually on the electric starter.

When she's running and warmed up she seems to run and idle fine. I can turn her off then, within a few minutes , she'll kick first time. Any longer and gets increasingly difficult to start with kick or electric starter

From cold is very difficult to start, sometimes she will show signs of life and others there is nothing at all. On the odd occasion she does start she is fine when warmed up.

Have checked the electric choke, resistance is as per the Haynes manual and needle extends by approx 4 to 5 mm when hooked up to a battery.

I get what seems to be a decent spark if remove plug and lay it against cylinder.

Compression tester shows approx 125 to 130 psi (after about 5 kicks)

Plug is getting wet with fuel.

Have removed carb & stripped but all looks pristine. Air/Fuel screw is set to 3 turns out in accordance with the manual.

Air filter looks like new.

Reeds look fine and look like they are seating properly.

Removed exhaust to check for any blockages, nothing obvious i.e. I can blow through the exhaust with little resistance.

I previously fitted a new plug when originally fixing the crank seals so have tried swapping back between the new & old plugs but with no noticeable affect.

Have even pulled the rotor etc back off to check the crank seals are still Ok and that the rotor had not slipped or broken the woodruff key. There was a tiny amount of oil on the left hand crank seal but this could have been from when I fitted them. Both seals are in place and look in good condition.

Possibly thinking a weak spark under compression (although it looks fine externally) or it is somehow flooding but as I said the choke seems to work OK.

Not sure where to go next, any suggestions would be great as I'm now at a loss !!!

 

hello just fixed a honda sky 50 with exactly the same problem
i replaced the whole carb with one of a sym red devil also a 50 cc
now it starts and revs properly.
ps do you know the best place to get a bulb for one of these as its a osram 7327