Have a Rover 2 stroke mower with Suzuki 2 stroke motor-very nice piece of kit,older gent restores push mowers and gets them running great. But this one has 'surging' issue. We are looking for advice on the setting for mixture setting screw-we have manual but no help-what could the original setting be? He has it at 1 and a 1/2 turns-maybe more?

Its a pain to get at-and lots have to be taken off motor to adjust-and cannot be run while doing it. So any advice would be great.Rover motor thread as close as I could find to ask. Its a beautiful motor-and seek to get it running right for my lawn care business.

Thanks.