On Mar 22, 2:11 am, "Roger Long" wrote:
Tom,

The engine that burns more fuel is the one with the control problem, right?

No, the problem engine is using less fuel for the same nominal rpm.

...Turning the adjustment could
cause even more problems if so.

Yes, there must be a reason they don't want users to mess with it.
That could be it.

Get an opinion from someone who actually knows but I'll bet a six pack they
are going to tell you they need to pull the rear case cover and look at that
spring.

I'd happily pay for an opinion from "someone who actually knows", but
simply asking (and paying) the local Yanmar dealers and recommended
independents obviously isn't a good way to get that opinion...

-- Tom.