OS Motors GT60 w/o Muffler

This is the O.S. GT60 Gas Big Scale Plane Engine without Muffler.

FEATURES:
Linerless cylinder with the cylinder head integrated with the
    cylinder, this arrangement allows for very exact intake/
    exhaust timing and extremely high scavenging efficiency leading to
    higher output
IG-02 electronic ignition system can be powered by 4-6 cell NiCd/
    NiMH batteries or 2-cell LiPo batteries
Custom developed Walbro carburetor installed to rear of engine with
    integrated choke rod guide
Two year restricted service warranty through Hobby Services beginning at date
    of purchase

CONSISTS OF:
O.S. GT60 Gas Engine, IG-02 Electronic Ignition, Instruction
    Manual, and CM6 Glow Plug

REQUIRES:
Two-Cycle Oil: Break-In, Klotz Modelube advised, mix at 30:1
    gas/oil mixture for 10 flights, 1.3 - 1.6 gallons (5-6 liters) of
    gas
    After Break-In: mix at 50:1 ratio, See COMMENTS listed below
Propeller: 23x8 for break-in, 22x10-12, 23x8-10, 24x8-10 for
    Acro/Scale designs
Muffler: See COMMENTS listed below
Electric starter KEEP IN MIND, The propeller must be brought up to at least
    100RPM in order for the electronic ignition to work
Fuel: Unleaded routine gas (no need to use high octane)

SPECS:
Displacement: 3.656 (59.91cc)
Bore: 1.732" (44.0mm)
Stroke: 1.551" (39.4mm)
RPM Range: 1,600-8,000 RPM
Output: 6.00 hp @ 7,000 RPM
Weight: Engine, 49.38 oz (1400 g)
Ignition module, 3.7 oz (105 g)
Suggested Propeller Size and RPM Data:
    22x8 7,650 RPM
    22x10 6,900 RPM
    23x8 7,000 RPM
    24x8 6,550 RPM
    24x10 6,150 RPM
Carburetor Settings: Two turns out on high and low speed needles from
completely closed position, then begin engine and follow break-in
instructions in manual

Distance/Vertical Installing Hole Centers: 2.6" (66mm)
Distance/Horizontal Installing Hole Centers: 3.1" (78mm)
Height of Installing Tabs: 3.4" (85.6mm)
Height Lower Installing Tab/Top of Cylinder Head: 6.9" (175mm)
Height Lower Mounting Tab/Crankshaft Center: 1.7" (42.8mm)
Height Crankshaft Center/Top of Cylinder Head: 5.2" (132.2mm)
Cylinder Head Width: 6.6" (168mm)
Width at Mounting Tabs: 3.8" (97.6mm)
Center of Muffler Mounting Holes: 1.6" (40mm)
Distance/Crankshaft Center to Muffler Hole Center: 2.7" (69.5mm)
Length from Carburetor to Backplate: 1.5" (38.8mm)

COMMENTS:
If utilizing a different brand of oil aside from Klotz, OS advises
    their own mix ratio which may differ from the makers'
    For 40:1, and 50:1 oils, OS advises a 30:1 gas/oil mixture
25:1 is 5oz of pre-mixed 2-cycle oil or 151 ml per gallon of fuel
30:1 is 4.3oz of pre-mixed 2-cycle oil or 126 ml per gallon of fuel
40:1 is 3.2oz of pre-mix 2-cycle oil or 95 ml per gallon of fuel
50:1 is 2.6oz of pre-mix 2-cycle oil or 76 mll per gallon of fuel

The following mufflers are ideal for different applications;
J'TEC Big Wraparound Pitts Muffler, JTCG7950 for inverted
mounting applications.
Bisson Wraparound, and Inverted mufflers will also fit