O.S. .12TZ (P)-T 5-Port w/11HB Carb

FEATURES: Black powder coated aluminum construction Nine fin natural aluminum cooling head Two-piece turbo cylinder head with 29mm innner and 49mm outer head that adds extra area for more efficient cooling Slide Carb 11H(B) 3 needle Slide Valve Carburetor OSMG2474 with ROAR legal 5.5mm carb restrictor and 6.5mm restrictor for outlaw racing Rear Exhaust ABC construction, Aluminum piston and Brass liner that is Chrome plated, 5 port cylinder liner High tensile A7075 "knife edge" aluminum connecting rod double bushed for friction-free operation Offers enormous torque from low RPM

INCLUDES: One O.S. Max 12TZ ABC Pilot Shaft Turbo Engine with P6 Glow Plug OSMG2696 11H(B) Slide Valve Carb OSMG2474, & instruction manual One Exhaust Seal OSMG8871

REQUIRES: Fuel: 10%-30% nitro (recommend starting w/20% changing to a higher nitro content if necessary) w/18% lubricant Air Cleaner

SPECS: Bore: 0.54" (13.8mm) Stroke: 0.55" (14.0mm) Displacement: 2.11cc Practical RPM Range: 5,000-40,000 rpm Power Output: 1.62 @ 34,400 Weight: 7.9oz (224.5g)

Distance between mounting holes same side: 0.43" (11mm) Distance between mounting holes opposite side: 1.2" (31.4mm) Width not including mounting flanges: 1" (25.4mm) Width including mounting flanges: 1.5" (39mm) Height bottom of crankcase to top of cylinder head: 3.5" (89.6mm) Height bottom of mounting flanges to top cylinder head: 3" (77.2mm) Height crankshaft center to top of cylinder head: 3" (77.2mm) Length from front of crankcase to end of crankshaft: 1.2" (29.5mm) Length center line of piston to front of crankcase: 1.4" (34.8mm) Length center line of piston to front of crankshaft: 2.5" (64.3mm) Length from backplate to end of crankshaft: 3.1" (79.4mm) Length from backplate to front of crankcase: 2" (49.9mm) Crankshaft threads: 1/4-28

COMMENTS: Some notes on Slide Valve and Rotary Carburetors: Rotary Carbs offer a larger response in the middle of the power band. This works well for off-road applications when throttle response must be varied. Slide Valve Carbs provide greater response at the beginning and end of the power band. This works well for on-road and racing applications for fast take-offs and high speed. Many high-performance engines have short lives, as racers constantly strive to "lean them out" for greater performance. Unfortunately, it also makes engines run hotter, which reduces their lives.

Needle Settings: Needle Valve (aka High Speed Needle):1¾ open from closed position per page 18 of engine manual.

Mixture Control Screw (aka Low Speed Needle):The head of the mixture control screw is flush with the carb body per page 25 of eng manual

Metering Needle: Head of metering needle screw is flush with the ball link body per page 25 of engine manual.

Throttle Stop Screw: This is set so the rotor is still 0.5mm open when closed per page 18 of engine manual. 12TZ ABC engines in this series include: 11M Carb, 3-Port Standard Crankshaft, OSMG1995 11M Carb, 3-Port Short Crankshaft, OSMG1996 11H Carb, 3-Port Pilot Crankshaft, OSMG1997

The difference between this engine and the .12TZ(P)-T 3 Port Turbo (OSMG19977) is that this engine has 5 ports, different crankshaft, crankcase is black powder coated, & has a natural aluminum head instead of the blue head.