OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Rover Engines Mixture Screw Setting for Suzuki motor on Rover

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.

G'day Zippy, and welcome to the ODK Forums.

The mixture screw on these only affects the idle, and the correct initial setting is 1.5 turns out from closed. Note that this is an air metering screw, so it's clockwise for richer, anticlockwise for leaner. I'd say you will have to adjust it with the air cleaner off the engine.
The idle speed screw initial setting procedure is to back it out until the throttle butterfly is completely closed, then turn back in 1.5 turns.

It has been found that the Mikuni carbies on these engines are particularly susceptible to getting gummed up from old fuel [89 octane unleaded is the worst for this], and this commonly causes surging/hunting. They are a bit fiddly to clean out properly, but doing so usually has good results.

These past threads discuss this in some detail: https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/49918/

https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=50677