After cleaning an opening a dense pipe from the flametrap to the intake manifold, under the carb. (sorry for my english), I've noticed that when the engine has run for to-three min. it comes white water vapour out the back. And it also drips and squirt water out when I hit the throttle.

I dont think it any coolant when it syddenly came after doing this...

What is it and what do I do to fix it...

are you sure its water, not petrol?

if its petrol, and it goes away, it just means that with the choke out your engine is running rich, which is ok

very good!

beter squirting the water out then letting it muck up your oil.

(wich happens when the crankcase ventilation hoses are clogged up)

greetings Wouter