thankyou Mr big . that was a little help strange though its just started happening here . and the jet is almost never to be found !!
earlier is always better than later even in such simple things as small engines huh . AVB check out that thread , it might show you the type of carb . same things have been here for YEEARS now . and it is a popular swap for older. alloy pulser prime type auto choke jobbies .

thanks for the pointer BigTed