YS Performance Engines
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| YSE0064 |
YSE .63S 4-STROKE W/MUFFLER |
$286.96 | |||||||||||||
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This engine replaces the discontinued YS .91FZ as of July 1, 2003. It is the same physical size and weight as the 91 and produces 5 to 8% more power depending on fuel used. Propellers used on the 91 will normally turn 500 to 700 rpm more on the 1.10. We recommend sizes which allow the engine to turn 8800 to 9500 for best results.
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| YSE0083 |
YSE 1.10 FZ 4-STROKE W/MUFFLER REPLACES .91FZ |
$409.96 | |||||||||||||
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The new YS 1.40 Sport is now available. This engine replaces the YS 1.20 FZ which was discontinued in early 2002. It is an exceptionally easy engine to operate with smooth running characteristics and the ability to run well on fuel in a variety of nitro percentages. However, we still recommend YS 20/20 fuel for best results. It is the same physical size as the 1.20 it replaces. |
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| YSE0093 |
YSE 1.4 4-STROKE W/MUFFLER SPORT [REPLACES 1.2] |
$590.36 | |||||||||||||
| YSE0095 |
YSE 1.40 LTD 4-STROKE |
$762.56 | |||||||||||||
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The YS 1.40DZ sweeps the US National Champs! After more than three years of development and testing, YS has introduced an all new 1.40 which departs from the usual high pressure regulator system which YS pioneered nearly 30 years ago. The 1.40DZ uses a crankcase pressure driven fuel pump and direct injection which results in a very user friendly engine which is happy on fuels up to 30% nitro methane and is not prone to detonation. The YS 1.40DZ is happiest when run on fuels made specifically for it's use. Several fuel manufacturer's are now mixing fuels specifically for use in the DZ. They include Cool Power, Magnum and Powermaster. Contact these manufacturers for further info. Any prop which allows the DZ to run in the low to mid 8000 RPM range will work well depending on your application. We have used 16x14, 17x12, 18x8 and 18x10, but other work well as long as they turn in the correct RPM range.
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| YSE0097 |
YSE 140 DZ |
$819.99 | |||||||||||||
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63FZThis engine is discontinued as of April 1st, 2004, but will continue to provide parts as necessary. |
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| YS-63-FZ-4C | YS-63FZ-4C | $274.74 | |||||||||||||
| YS-110-4C | YS-110 - 4C | $392.50 | |||||||||||||
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The new YS 1.40 Sport is now available. This engine replaces the YS 1.20 FZ which was discontinued in early 2002. It is an exceptionally easy engine to operate with smooth running characteristics and the ability to run well on fuel in a variety of nitro percentages. However, we still recommend YS 20/20 fuel for best results. It is the same physical size as the 1.20 it replaces.
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| YS-140 SPORT |
YS-140 SPORT |
$565.21 | |||||||||||||
 160DZ
While your focus may be other than competition aeromodeling, the YS 160DZ delivers more horsepower than an engine in its class, either two or four stroke. Depending on your selection of aircraft, the YS 160DZ can power models up to eighteen pounds with outstanding flight performance. Propeller size ranges from 15.5x12 four blade up to 18x10 wide, and ideal RPM range is 8000 to 8500 for best flight performance. Recommended fuel is 20 to 30% nitro helicopter type for best results
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| YS-160-4C | YS-160 4C | $804.16 | |||||||||||||
| YS-PLUG | YS 4 CYCLE ENGINE GLOW PLUG | $8.59 | |||||||||||||
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| GMS-47ABC |
GMS 2000 - 47ABC |
$68.05 | |||||||||||||
APPLIES
TO ALL YS 4 STROKE ENGINES EXCEPT 140DZ
FUEL RECOMMENDATION:
YS 20/20. This fuel is made by several different fuel
manufacturers. All are suitable. 30% heli fuel also works well for
those desiring more power.
GLOW PLUG:
YS #4 or OS Type F.
PROP SIZE RECOMMENDATIONS:
YS 63 -- 11 x 7, 11 x 8, 12 x 6, 12 x 7, 13 x 5, 14 x 4.
YS 91/110 -- 13 x 12, 14 x 10, 14 x 12, 15 x 8, 16 x 6.
YS 140 Sport - 15 x 13, 16 x 12, 17 x 8, 17 x 10.
YS 140DZ -- 16 x 14, 17 x 12, 18 x 8.
Other prop sizes may be used as long as the engines run in the recommended RPM ranges. In hot weather and break-in of new engines, use the smaller prop sizes to lessen the load on the engine to help it run cooler.
RECOMMENDED RPM RANGES:
YS 63 -- 10,500 to 11,500
YS 91/110 -- 8,800 to 9,800
YS 140 Sport -- 8,000 to 9,000
YS 140DZ -- 8,000 to 8,500
WHEN READYING ANY YS 4-STROKE ENGINE (EXCEPT DZ)
FOR RUNNING, FOLLOW THESE PROCEDURES:
1. Be sure that the engines has fuel lines connected per
the instruction sheet supplied with the engine.
2. Open high-speed needle valve 2 turns.
3. With fuel tank filled completely and the fuel lines connect properly,
prime the engine by running it at full throttle with the starter for 5 - 10
seconds. DO NOT CONNECT THE STARTING BATTERY WHILE DOING THIS.
4. Set throttle at 1/4 open. Have a helper hold the airplane if so
mounted.
5. Connect starting battery and apply starter. Engine should start
immediately. If it does not, check for fuel delivery and make sure the
glow plug is operating properly.
6. Upon starting, allow the engine to run at 1/4 throttle for at least 30
seconds.
7. Advance throttle to full and adjust the high-speed needle to a slightly
rich full power setting. When set, slowly reduce throttle to a fast idle.
8. Allow the fast idle to continue for a few seconds, then advance the
throttle to full. If the transition from low to high is rich, the
regulator screw should be turned clockwise. If the transition is lean,
turn the screw counter-clockwise to richen. Adjustment should be made 1/4
turn at a time until you are very close then 1/8 turn for fine adjustment.
DO THIS ADJUSTMENT WITH THE ENGINE STOPPED FOR SAFETY.
9. When the transition is set correctly, then reduce the throttle to full
idle. If the idle speed slowly rises, screw the idle screw clockwise to
richen. If the idle speed slowly drops, open the idle screw to lean.
Work 1/8 turn at a time with the idle screw adjustment. Correct idle speed
is 2200 to 2400 RPM. At this point the
engine should be set correctly.
FURTHER ADJUSTMENTS WILL BE REQUIRED AS THE ENGINE BREAKS IN.
.63S
4-STROKE W/MUFFLER 
110FZ
140
SPORT
GMS
2000-47ABC 2 Stroke Engine w/Muffler