PROBLEM
CAUSE
SOLUTION
1) Engine does not start
A) Failed glow plug
A) Replace glow plug with a new one
B) Glow Starter not charged and/or faulty
B) Fully charge glow starter and/or replace
C) Idle mixture screw set too lean
C) Reset idle mixture to factory setting
D) Old or contaminated fuel
D) Replace with new fuel
E) Engine flooded with too much fuel
E) Remove glow plug and expel fuel from cylinder
F) Air leak in fuel system and/or engine
F) Replace fuel lines and/or tighten all engine bolts
2) Engine does not draw fuel
A) Air leak in fuel system and/or engine
A) Replace fuel lines and/or tighten all engine bolts
B) High speed needle valve fully closed
B) Reset high speed needle valve to factory setting
C) Idle mixture screw set too lean
C) Reset idle mixture to factory setting
D) Fuel lines kinked
D) Check and straighten fuel lines
E) Defective fuel tank
E) Replace fuel tank
3) Engine does not transition
A) Failed and/or wrong type glow plug
A) Replace with new recommended glow plug
B) Old and/or wrong type fuel
B) Replace with new recommended fuel
C) High speed needle valve set too rich
C) Reset high speed needle valve to leaner setting
D) Idle mixture set too lean
D) Set idle mixture richer
E) Idle mixture set too rich
E) Set idle mixture leaner
F) Air leak in fuel system and/or engine
F) Replace fuel lines and/or tighten all engine bolts
4) Engine overheats
A) Engine running too lean
A) Richen high speed needle valve
B) Body too Restrictive
B) Open larger vents in body to allow air to enter and exit
C) Wrong type of fuel used
C) Use fuel recommended only for R/C cars
D) Engine not fully broken in
D) Allow engine further break-in time
5) Engine vibrates excessively
A) Engine and/or engine mounts loose
A) Tighten all engine mounting bolts
6) Engine does not idle down
A) Idle stop screw out of adjustment
A) Adjust idle stop screw so carb barrel stays open 1mm
B) Air leak in fuel system and/or engine
B) Check fuel lines, tank and engine bolts. Verify carb is
seated and tight
C) Glow plug heat-range too cold
C) Use a hotter heat-range glow plug
All SH engines returned for warranty service must be within the warranty terms as stated on the warranty card provided with your engine.
Do not return the engine to the place of purchase. They are not authorized or equipped to perform warranty work on SH products. When
requesting warranty service, please observe the following guidelines:
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Always send the complete engine including the carburetor. The engine must be removed from the model.
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Include a note detailing the problem or service you are requesting. Service cannot be provided without this information. Include your daytime phone
number in the event we need more details pertaining to the service requested.
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You may request an estimate of services at the time you return your engine for service. An omission of this request implies permission for Global
Services to service your engine at our discretion.
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Include a method of payment for any service charges. If not specified, the unit will be returned to you C.O.D.
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Send the engine to us by United Parcel Service, Federal Express or by Insured Mail. Postage is not refundable. Send to:
Global Services
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18480 Bandilier Circle
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Fountain Valley, CA 92708
Phone (714) 963-0329
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Fax (714) 964-6236
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Email: [email protected]
RETURNING FOR WARRANTY SERVICE
This troubleshooting guide has been provided to help you diagnose and solve most problems that you may encounter with
your SH .12 Turbo Modified On-Road engine. Most problems encountered can be solved by carefully following the problem-cause-
solution sections below. If you cannot solve the problem using this troubleshooting guide, please feel free to contact us at the address
or phone number listed at the bottom of this page.
TROUBLESHOOTING GUIDE
