I carry the entire line of RCGF/Stinger engines, please refer to my other listing as well please. 

RCGF Stinger 30cc TWIN
Smooth operation — Smaller size
RCGF high end Stinger 30cc twin cylinder engines are ready, you can get more smooth fly experience. It is small, powerful and easy starting,It is your very good choice for small size twin cylinder engine

 Parameter

Type2 cycle piston valve type gasoline engine for airplane
Displacement (cc)30cc (1.83 cu in)
Bore x Stroke (mm)1.26 in(32mm) x 0.77 in (19.6mm)
Recommended props18×8, 18×10, 19×8 & 20×8
Maximum Output3.7HP /7500rmp
Power supply7.4V-14V
  1. Carburetor : Walbro
  2. Ignition : Stinger DC-CDI (Computer Controlled auto advance, electronic ignition system)
  3. SPARK PLUG: M8(1/4-32)
  4. Requires: Gasoline, 2-cycle oil, ignition battery & propeller
  5. speed rang : 1500-8500rpm
  6. Gasoline-Version : Pre-mixed Fuel, 25-40 (Gasoline):1 (recommended : 32:1 for real oil, or 40:1 for synthetic oil) 
  7. Lubrication Oil : High quality fully synthetic 2 cylinder oil such as Motul 800 2T 100% synthetic racing motro oil , Red line two-stroke racing motor oil , Stihl Ultra high performance 2 cycle fully synthetic engine oil etc . 
  8. Break in Propeller : 18X8 (Standard Two leafs prop)
  9. Cooling System : Air Cooled
  10. RCGF Stinger Engine package Includes: electronic CDI ignition, muffler, spark plug, gaskets, bolts, throttle arm extension & manual.

Weight:

  1. Engine: 2.03 lb (923g)
  2. 2XMuffler: 2.71 oz (77 g)
  3. Ignition Module: 5.1 oz (145 g)
  4. Total: Weight: 2.53 lb (1145 g)

Technical Data:

  1. Ignition Battery: 7.4V-14VNiCd or NiMH, 7.4V LiFe or 2S LiPo pack ( DO NOT use BEC, iBEC or uBEC)
  2. Gasoline/Oil Mix: (recommended : 32:1 for real oil, or 40:1 for synthetic oil) 
  3. Replacement Spark Plug: M8 1/4-32 or equivalent
  4. Idle Speed: 1600 rpm/min