User Manual

8
Atemperaturegaugeshouldonlybeusedasatuning
aid by giving you a relative indication of how your
adjustments are affecting the engine and to help prevent
you from reaching higher than recommended engine
operatingtemperatures.Asyouleanthefuelmixture,
the engine performance will increase along with the
temperature.Ifyoucontinuetoleanthefuelmixtureand
the temperature increases but the engine performance
does not change, then you have exceeded the maximum
safeleansetting.Ingeneral,trytokeepyourenginefrom
exceeding 270°F when measured at the glow plug.
Most properly and fully broken in engines operate well
at temperatures of 200 to 265°F depending on track
conditions, driving style, atmospheric conditions, and
gauge accuracy.
FACTORY NEEDLE SETTINGS
Ifatanypointyoufindyourself“lost”asfarastuning
goes, going back to the factory carburetor settings should
allow you to get right back on track.
Following is a listing of available carburetors and their
factory preset needle settings.
.21 AND LARGER 2-NEEDLE SLIDE VALVE
CARBURETOR:
High-Speed Needle: 3
1
/
2
turns out (counterclockwise) from
closed.
Low-Speed Needle: 2 turns out (counterclockwise) from
closed.
.21 AND LARGER 3-NEEDLE SLIDE VALVE
CARBURETOR:
High-Speed Needle: 3
1
/
2
turns out (counterclockwise) from
closed.
Low-Speed Needle: 2 turns out (counterclockwise) from
closed.
Mid-Range Needle: Screw should be just slightly in from
flush with the face of the carburetor.
.12, .15, .18 2-NEEDLE SLIDE VALVE
CARBURETOR:
High-Speed Needle: 2 turns out (counterclockwise) from
closed.
Low-Speed Needle: 2 turns out (counterclockwise) from
closed.
.12, .15, .18 2-NEEDLE ROTARY CARBURETOR:
High-Speed Needle: 2 turns out (counterclockwise) from
closed.
Low-Speed Needle: 2 turns out (counterclockwise) from
closed.
When checking the adjustment of the low-speed needle, it
is crucial that the throttle slide is closed completely when
turning the needle and that you do not over-tighten the
needle.UseaDynamite3-IN-1engine-tuningscrewdriver
(DYN3048) to make this job easier. When you feel
resistance in the needle, immediately stop turning and
begin turning the needles counterclockwise, counting the
number of turns from “closed”.
TROUBLESHOOTING GUIDE
Problem Possible Cause/Solution
Engine won’t start: · Clogged fuel line
· Bad or improper glow plug
· Glow igniter not charged
Engine starts, · Engine flooded
and then dies: · Pressure line blocked
or disconnected
· Bad or improper glow plug
Engine starts and · High-speed needle too lean
runs for 1/2 tank and · Hole or tear in fuel line
then quits · Defective fuel tank
· Bad or improper glow plug
 ·Idlespeedsettoolow
· Overheated engine (too lean)
 ·Improperneedlesettings