Very Hot Engine
12-02-2018, 11:31 AM
#1
Very Hot Engine
So I have this Saito 4-stroke and it doesnt seem to have any trouble starting up, but it gets REALLY hot really fast...it will run well as long as I keep throttle higher than idle...but if I bring it back it will stall every time and even at higher RPM it will stall within 30 seconds and when it does, there will be smoke coming out the exhaust. The fuel is standard 15% so im not sure what would be causing this. Any ideas?
12-02-2018, 11:42 AM
#2
My first thought is almost always too lean when reading posts like this. Does the engine exhibit the same behavior when set one turn richer on both the low and high speed needles?
12-03-2018, 03:07 AM
#5
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Based on my experience with many Saitos the low speed needle appears to be at the original factory setting, (very rich). I'll blame it on the high speed needle or the prop size as Pope stated. What size Saito is it, please.
All could be right, though.
All could be right, though.
12-04-2018, 06:11 PM
#7
Its a FA-91 and its an OS type F. I not too privvy on how these engines work. I think the low speed needle is at the base of the throttle so I cant get to that without removing the engine from the plane....but there is also a little spring screw on top of the carb, but not 100% sure what thats called. I was gonna try to start it up again today but my glow stick wasnt charged, so I will try again tomorrow.
12-04-2018, 07:16 PM
#9
My Feedback: (1)
go to the Saito Club page (in my link) and maybe Hobbsy (Dave) will tell you how he tunes his Saitos, the other guys will help too
http://www.rcuniverse.com/forum/glow...aito-1525.html
Jim
http://www.rcuniverse.com/forum/glow...aito-1525.html
Jim
12-04-2018, 07:23 PM
#10
My Feedback: (1)
I think the low speed needle is at the base of the throttle so I cant get to that without removing the engine from the plane
Jim
12-05-2018, 11:55 AM
#11
Okay I got it to idle pretty good but as soon as I pull of the glow stick, it stalls, and if I give it gas it will start to stall unless I open throttle a bit more then it will go and start to stall again... and repeat.
Last edited by erwabo; 12-05-2018 at 12:23 PM.
12-05-2018, 12:50 PM
#12
Change the glow plug for a new one and see if the behavior still exists. If it does, typically a rich idle mixture will cause the engine to quit when the glow driver is removed. A bad glow plug can exhibit the same behavior.
Thanks for all the advice. 
