PK125 jetting?

[afscmik]

Hi spence. just a query. can any small frame expert help.

I have just changed the wifes PK125 carb for a new one. old one was a spanish dell'orto shbc 201 , 20 or 21mm i think. new one is an italian 19\19. old main jet was a 80 and ran fine new one has a 76. I figured the smaller venturi would be compensated by the smaller jet. but it starts being asthmatic at 3 quarter revs. I put the 80 in and its still the same. am I missing something obvious? what jet should I need to go to up or down? before I go mad taking the tank in and out to remove both the carb and the skin off my knuckles.

thanks Mik

[afscmik]

Ive now tried an 80, 76,75, and 78 the 78 sounds the best but it dies after 300 yards and will only start by bump starting. I have an 82 and 85 left. can't get hold of others. but I don't think I should be going up should I? I must have this machine going for Friday so she can ride over for northern aces. otherwise its me on the lammy and her in the car. I cant do 160 miles each way 2 up with camping equipment on the lammy. and I dont have the carrying capacity on the LML.