Hi all,

I need help with the throttle setup for the Saito 56 and a SIG 4 star 40. What is the best way to mount the engine, vertical, upside down sideways and also any info on the throttle setup would be great

Thanks

Bill

I had mine mounted vertical..This engine is an excellent match for the 4*..Your gonna love it..

Everyone says it's a great engine for this plane. The one thing I am having trouble with is the throttle setup. The throttle arm on the carb lines directly up with the back of the motor mount and is much lower that the hole that was drilled (plane is an ARF). If I redrill to the side of the mount then the rod will be to far to the side. A ball link might help there but I am just trying to get info on what everyone else has done

Thanks for your reply though, it sets in cement what I want to do and that is the Saito instead of the OS 46AX (which I know is another great engine for this plane, but thats another story.

Bill

All you have to do is rotate the throttle arm so that when the carb is closed it stops before it hits the firewall. Then just get a piece of 2-56 rod with threads on one end. Run the threaded end past the arm on the carb then bend it back towards it. Attach a nylon clevis and your set!!

You could drill a hole through the motor mount and use a flexable cable.
You can rotate carb throttle arm 180 degrees that would put your arm higher.
You can go past the throttle arm and make a U in the push rod and come at it from the front.
You can mount a bellcrank on the motor mount and attach the pushrod to it and the other end you
can connect anothershort pushrod to the throttle arm.
I have used all the above. Somethimes a
4 stroke can be a PITA.

Bill,

The owner of a LHS sold me the Du-Bro 4 stroke linkage. This lingage consists of a single arm of a belcrank that will attach towards the front of the engine mount. The throttle cable from the servo attaches to the arm. The arm has a positive link (2-56 rod) to the throttle arm. the Du-Bro kit contains everything you need to attach the product to the kit. It provides the optimum amount of slop to enable the throttle arm to move inwards/outwards when opening/closing during operation. It cost 3.95

The other method that he suggested, is to take cable and put a U into it and solder the U to prevent future bending. The cable will have a clevis threaded on, and then attached to the throttle arm.

Lew B

If rotating the throttle arm will not allow it to clear the motor mount, take a piece of 2-56 pushrod and make a bend so it will clear the motor mount. Drill a new hole where needed and plug the old hole with a piece of dowel.

The special adaptor/linkage is normally not needed for a 4 stroke since you can reverse the servo to get the proper movement.