midwesterner

I made a previous post on how I was having problems with my Saito 91 4-stroke.
It was looseing RPM's after it had warmed up. Tried a new plug, checked out the plumbing, adjusted values, tried everything I could think of. My son said he would take a look at it and of course he found the problem.

The engine is mounted sideways so when it warmed up the choke slide vibrated down and slightly choked the engine thus loosing RPM's. I would of thought that with the engine being choked that it would run rough and smoke alot but it didn't.

Thanks to all who tried to help me.

aerowoof

good for you.

HellcatAce

My Feedback: (6)

That's the thing with a Saito. They run so darn good in any condition that finding the problem can be a pain. Was helping a guy with a new Saito 125 on a customers plane. It would run but fuel would burble, bubble, and pour out of the exhaust even at idle. After looking for some obvious problem like too much tank pressure, bad carb, etc., it turned out that the low speed needle was just set way too rich. Now how many engines will run fine with fuel pouring out of them?

w8ye

My Feedback: (16)

You should remove the choke. The new ones have not had chokes in over 10 years

Gray Beard

My Feedback: (-1)

When he said choke my brain wint into the big???????????????? mode? I haven't seen one on an engine in years. I pulled them off my OS engines a long time ago. They did work great though on cowled engines. I may be installing one on a ST G-20 that doesn't choke well with the finger over the muffler.