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SNOWMOBILE
©2007 YAMAHA MOTOR CORPORATION, U.S.A.
2007 PZ50W/FXW/GTW/MW/VTW
Hard Starting in Extreme Cold Temperatures
Symptom:
Some affected units have experi-
enced hard starting in temperatures
below -15ºF (-26ºC).
Cause:
Reduced engine cranking speed in
extremely cold temperatures affects
the engine decompression and
ECU calibration. This can reduce
the engine starting performance.
Remedy:
Install ECU kit, which includes
a new ECU, two decompression
springs, and a cylinder head cover
gasket (see Parts Information sec-
tion for more details).
Additional
Notes:
It is normal for the engine to crank for several seconds before starting. However, early-season
extended-cranking time or engine not starting in temperatures above -15˚F (-26˚C) is usually
associated with the following:
• Stale gasoline (more than 30 days old) or summer-blend gasoline;
• Contaminated spark plugs caused by stale gasoline; or
• A weak or discharged battery caused by long cranking.
• It can also be caused by repeatedly starting and stopping the engine without allowing the
engine to reach operating temperature.
Should this be the problem, then perform the following:
1. Drain the fuel from the machine and replace it with fresh premium gasoline.
2. Replace the spark plugs.
3. Charge the battery properly using the correct charger.
4. Do not start and stop the engine without allowing it to reach operating temperature.
Sold
Units:
Contact those customers who have reported hard starting in extreme cold temperatures and
arrange a convenient time to install the new exhaust decompression springs and ECU.
Unsold
Units:
N/A
Parts
Required: Yes, Order one ECU kit per unit as required.
Warranty:
Submit a Service-Per-Bulletin (90 Code) Warranty Request for parts and labor. This 90-code
expires December 31, 2009.
12/18/07
S2007-011
PAGE 1 of 4
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Summary of Contents for Yamaha PZ50W 2007
- Page 1 SNOWMOBILE 12/18/07 S2007-011 ©2007 YAMAHA MOTOR CORPORATION, U.S.A. 2007 PZ50W/FXW/GTW/MW/VTW Hard Starting in Extreme Cold Temperatures Symptom: Some affected units have experi- enced hard starting in temperatures below -15ºF (-26ºC). Cause: Reduced engine cranking speed in extremely cold temperatures affects the engine decompression and ECU calibration.
- Page 2 All 2007 PZ50W (Phazer) All 2007 PZ50GTW (Phazer GT) All 2007 PZ50FXW (Phazer FX) All 2007 PZ50MW (Phazer Mountain Lite) All 2007 PZ50VTW (Venture Lite) For the following procedure, refer to the appropriate sections in the Service Manual (P/N: LIT-12618-02-58) available on YDS.
- Page 3 7. Install the new decompression spring. NOTE: Check that the spring is properly installed as shown in the adjacent photo. 8. Using the primary clutch, turn the engine in the normal (clockwise) direction of rotation to access the other spring. Install the second spring. 9.
- Page 4 Service of all affected units is authorized regardless of warranty status until this 90-code expires on December 31, 2009. To receive credit for the parts and labor, select 090UG from the Problem Code pull-down menu in the Yamaha Dealer System (YDS). If submitting a paper warranty claim, use Problem Code 90UG The labor allowance for this modification is 1.1 hours.