Tower Hobbies .61 Ball Bearing ABC Schnuerle & Muffler

Tower Stock# LXUR77  •  Manufacturer Stock# 161
Tower Hobbies .61 Ball Bearing ABC Schnuerle & Muffler (large view)
Notes from our tech department:
This is the Tower Hobbies .61 2-Stroke R/C ABC SNL Engine w/Muffler.

Free Postage When You Order Parts Through Tower Hobbies and a
Doubled Warranty When You Join the Super Saver Club.

For optional mufflers, see COMMENTS.


CNC (Computer-Numerically-Controlled) machining for exact tolerances
One-piece aluminum crankcase
Dual ball bearing-supported crankshaft
ABC (Aluminum-Piston, Brass Liner w/Chrome Plating) construction.
Schnuerle porting
Expansion style muffler w/pressure fitting & rotatable exhaust outlet
Side exhaust
Two-needle carburetor design
Remote needle valve for safer, easier needle adjustment having a
sturdy metal mounting bracket.
TWO YEAR warranty.


One Assembled Engine w/Purple Anodized Head and Thrust Washer
One Carburetor w/High & Low Speed Needle Valves
One Metal Needle Valve Mounting Bracket w/Needle Valve Assembly
One Expansion-Style Tuned Muffler
Two 4 x 16mm Muffler Screws
Two Extra Head Gaskets
One Aluminum Exhaust Gasket
One 3mm Allen Wrench
One 2.5mm Allen Wrench
One Set of Instructions


Glow Plug: Tower R/C Long or OS Max #8 recommended
Propeller: 11x7 or 12x6
Fuel: 5% - 15% Nitromethane. 18% (minimum) Lubricant Content of
castor oil OR a castor-synthetic blend. Tower Power recommended.
Misc. Items: Glow plug starter, glow plug wrench, fuel pump, chicken
stick, or electric starter.


Displacement: 9.95cc (.61 cid)
Bore: 24mm (.946")
Stoke: 22mm (.867")
Horsepower: 1.9 BHP at 16,000 RPM
Weight: 665g (23.8oz) (with Muffler)
Weight: 532g (18.8oz) (without Muffler)
Length: 91mm (3.6") From Backplate to Front of Drive Washer
25.4mm (1") Front to Rear Mounting Hole Centers
Width: 41.35mm (1.63") Neglecting Engine Mounting Flanges
60mm (2.36") Including Engine Mounting Flanges
51.8mm (2.04") Side to Side Mounting Hole Centers
Height: 102mm (4")
Muffler Length: 171mm (6-3/4")(Overall)
Muffler Diameter: 44mm (1-3/4")
Crankshaft Thread Size: 5/16-24
Recommended Props: Break In: 11x7 or 12x6
Practical RPM Range: 2,000 - 17,000 RPM
Compression Ratio- Geometric: 10.6 : 1
Effective: 7.78 : 1
High Speed Needle: 4 turns OUT from closed
Idle Mixture Screw: Take carb out, turn upside down, line mixture
screw up with the side of the small hole in the spray bar.


If a Pitts style muffler is needed, the J'Tec #JT-60PB
will work, but muffler screws supplied with Tower engine must be
used, and mounting holes on muffler enlarged slightly.
Because of the precision tolerances, the engine feels tight
before break-in. ir/jl
updt jxs 3/27/03

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