Inlet timing too much?

[coaster]

Its a rubber mounted carb. I'll try going back to the 250 needle valve and see if that makes a difference.

Try blowing carb cleaner through the main jet orifices while you are at it to make sure they aren't blocked.

[nelson pk]

Thamks for all the replies. it really is much appreciated. i will try all suggestions and post back any findings. Any other suggestions are more than welcome.
Pete