Roto 85 FS - Carburetor Settings

ROTOmotor Ltd., Czech Republic - Europe
ROTO 85 FS
ROTOmotor Ltd., Czech Republic - Europe
Operating instructions
ROTOmotor manufacturer of top four-stroke engines
Page:14
H needle
L needle
Stop screw
The carburetor is factory adjusted and should NOT need an adjustment before a rst ight.
Should you wish to adjust the carburetor after the Run-in period and ne tune it to the prop
of your choice, please use the following procedure.
Set the High needle „ H „ for the highest RPM. After you are satised with High-end, adjust
the Low „ L „ needle for smooth transition between High and Low range with out any hesi-
tation.
Adjusting servo / idle
The idle speed is set to 1200 ± 200 RPM by the deection at the servo.
Then you can remove the stop screw.
How do we know that the engine is set correctly?
With the propeller 25/10 the engine achieves - 5700 ± 200 RPM. When properly adjusted, the
engine continuously accelerates from idle speed to maximum. The idle speed with a 25/10
propeller is 1,200 ± 200 RPM
These gures may dier when using a dierent propeller.
7.2 Carburetor settings
The image is for illustration purposes only
The motor has been adjusted on the bench. Must be loosen the
stop screw to avoid damaging the servo.
ROTO recommends removing Stop Screw and idle rpm keep by your TX