duber3
Posts: 133
Joined: 10/6/2005
From: QC,
QC, CANADA
Status: offline
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These engine are very easy to tune, juste follow the breakin procedure like the manual, and after the breakin, tune it like the manual said, if i'm right
your suppose tu adjust the hight speed needle first to reach the max rpm and you turn counter clockwise the HSN for lower the 200-300rpm
for the low speed here the copy of the manual and should obtain 1600-1700 rpm :
The low-speed, or idle needle valve
(89), is preadjusted at the factory for
best performance during break-in.
After break-in it may be necessary to
“fine tune” the low speed adjustment
using the following procedure:
Start the engine and let it warm up prior to attempting any adjustments.
Close the throttle slowly and adjust the low speed setting by rotating the
idle needle valve (89) clockwise to lean the mixture and counterclockwise
to richen the mixture.
The fuel mixture is too irch if when openning the throttle rapidly the
engine emits white smoke and “stutters” or “stumbles.” Correct this
by rotating the idle needle valve clockwise 1/4 to 1/2 trun at a time
until the engine transitions smoothly without hesitation upon opening the
throttle rapidly
The fuel mixture may be too lean if the engine stops at the lowest idle position,
or when the throttle is rapidly opened from idle. Attempt to correct this by
rotating the idle needle valve counterclockwise 1/4 to 1/2 turn at a time until
the engine transitions smoothly without hesitation upon opening the throttle
rapidly. If the situation is not rectified by counterclockwise rotations of the
idle needle valve, turn the idle needle valve clockwise in 1/4 to 1/2
turn increments.
After obtaining the proper idle setting, the low rpm setting may be
made through the positioning of the throttle adjustment screw, if applicable.
If not, adjust the idle setting via the throttle trim of your transmitter
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Hangar 9 Miss America - 
