How to adjust (reduce) engine speed on older B&S engine with no throttle control lever?
I have an old (1985) Homelite AP520 farm pump (pumps water from one pond to another, etc), that has a 5hp B&S engine (Model 130232, Type 1638-04, Code 85012807). When you crank the engine it just goes to top speed, there's no throttle control on it, it does have a mechanical governor that keeps it running a a constant speed (adjusts for the water load).
I want to slow the engine down so the pump makes less pressure, so I can put a fire hose nozzle on the end of the 2" flexible hose (when I do this with engine running a normal speed, the hose swells up REALLY TIGHT, I'm afraid it's gonna pop!).
I can slow the engine down a bit by closing the choke some - and that does help a little - but, that's not good for the engine, right? How long could I run it like that before some damage might be done - seconds?... minutes?
Thanks for any ideas!!