I have heard that mounting a four stroke with the cylinder hanging below horizontal can cause less than optimal idling. I'm not saying that this is true, but if some form of "collecting" is occurring, is it because of the cylinder angle or because of the angle of the carb and inlet pipe.

On my Saito 120, I would like to mount the engine so the cylinder is dropped 20 degrees below horizontal for exhaust routing reasons. BUT, I can rotate the carb inlet pipe by the same or greater angle such that excess fuel will flow out of the pipe instead of into the engine.

Any thoughts? Will this accomplish anything?

The mounting angle problems vary from engine type s. For the most part YS 4 stroke/cycle engines will run very well in any position. Many engines will not run reliably when installed inverted. If the exhaust port is at the lowest point of the installation ,flooding during starting is a lot less likely. This is true with 4 strokes and 2 strokes -GENERALLY.
All in all you can feel confident when mounting the YS in any position. Good Luck, LF

I have a Saito 150 mounted inverted in a Tiger Moth. The ONLY problem I've had is flooding due to the tank being higher than the carb. I've since cured this problem.

Running? Runs great, excellent throttle response, idles reliably between 1900-2100, even with slightly rich idle mixture on a 15-10 prop.

Don't worry about it... The big Saitos are great motors in any position.

Dave

Hello and don't fret

All Saitos

I have
.80 @ 90 deg
.91 @ 135 deg down
.56 inverted
1.20 inverted
All run great and no onboard glows installed

Go for it



Den

Personally, I think the four strokes are slightly easier to plumb properly in the inverted position than a comparable two stroke. I'm running a Magnum 120 inverted. It starts and idles perfectly. Just make sure the fuel tank centerline is in line, within a quarter inch or so, with the venturi. That's true with any non-pumped glow engine mounted in any position.