Zenoah G240RC 23 cc engine

After the successful G230 and G260 came the new generation of Zenoah engines. In terms of construction largely the same with as big change the assembly of the cylinder with 4 bolts instead of 2. This G240 has a capacity of 23 cc and 28 mm stroke.

Technical improvements:

• Lighter and stronger crank case
• 3 supporting crank shaft bearings
• New cylinder cooling ribs
• Re-shaped and enlarged transfer ports
• Combustion chamber modified
• Walbro WT990 caburetor

Technical Details:

• Displacement: 22.5 cc
• Cylinder bore: 32 mm
• Cylinder mounting: 4 bolts
• Cylinder stroke: 28 mm
• Crank bearings: 3 pcs.
• Power: 2.46 HP at 13,000 rpm
• Pulling force: 1.58 NM at 9,000 rpm
• Idle speed: approx. 4200 rpm
• Max. speed: approx. 19,000 rpm
• Fuel consumption: approx. 616 g/kw
• Carburettor: WT990
• Spark plug: NGK CMR7H
• Spark plug gap: 0.65mm
• Ignition system: (Transistor charger ignition (TCI with BTC 30° / 8000 URPM)
• Starting system: Pull starter
• Effective compression ratio: 8.9
• Recommended fuel: 1:25, 40 cc oil to 1 litre 98 octane fuel
• Overall dimensions (L166 x W205 x H196 mm)
• Weight approx.: 2.3 kg

Explanation of different carburetors:

• WT990 Standard carburetor without choke
• WT990BB Standard carburetor without choke und gelagerte Drosselklappenwelle.
• WT990BBS Standard carburetor without choke und gelagerte RVS 340 Drosselklappenwelle, (empfohlen)
• WT997 Optional carburetor with choke
• WT997BB Optional carburetor with choke und gelagerte Drosselklappenwelle
  
• WT997BBS Optional carburetor with choke und gelagerte RVS 340 Drosselklappenwelle, (empfohlen)

This Zenoah can easily be converted to a 23, 26 or 29 cc versions by conversion sets.

Conversion sets:

• G240 23 cc: ZN1001
• G270 26 cc: ZN1002
• G290 29 cc: ZN1003

This engine has the same installation dimensions as:

• Zenoah G230
• Zenoah G240
• Zenoah G260
• Zenoah G270
• Zenoah G290
• Chung Yang, Dynamic and similar

Engine is delivered complete but without clutch, engine flange and exhaust. For optimal use, we recommend the PSR-2 Race olie, and TPS™ Air filter system. All parts and tuning parts are available from stock!

Engine running in:

• 1) Use 1:25 fuel mixture, 40 cc good quality 2-stroke oil on one litre 98 Octane fuel
• 2) Carb needles both 1 1/4 turn open
• 3) Start first time let it run at idle for 2 minutes until is had normal temperature
• 4) Run first tank of fuel normal but without reaching high speed, this will take approx 45 minutes
• 5) Let it completely cool down
• 6) Run second tank of fuel, now start reaching high speed shortly, this will take approx 40 minutes
• 7) Let it completely cool down
• 8) Visual check in exhaust port, check for leakage
• 9) Third tank drive it like you normal would do, but still reaching high speed shortly, but building, this will take approx 35 minutes