O.S. MAX 91HZ-PS Ring    L-OS18620
Designed primarily for the 3D flight and dramatic aerobatic manouevres.. Compared to the old 'Hyper' the new 91HZ-PS offers improved hovering stability as well as power at high speed to meet the further sophisticated 3D competition manouevres.
A new design piston and crankshaft reduces vibration to provide further, stable torque over the entire RPM range. The rectangular heatsink head is completely included in the cooling shroud for better cooling. The black alumite finish with O.S. and 91HZ-PS logo impart a distinctive image. A Thermo insulator is installed on the carburetor mounting spigot and helps shut out engine heat to the carburettor, which in turn ensures a stable fuel/air mixture
The 91HZ-PS is equipped with a new, bigger capacity PD-08 pump and matched 61B-P carburettor plus integral regulator, which assures a consistent fuel supply irrespective of violent changes in model attitude.
Combined with O.S. pump system, internal parts improvements same as the 91HZ contribute to stable power output and smoother higher engine performance.   
Specification

• Weight:    635g
• Displacement:    14.95cc
• Bore:    27.7mm
• Stroke:    24.8mm
• Power Output:    3.5PS @ 15000RPM
• Practical RPM:    2000 - 16000

O.S. MAX 91HZ Ring    L-OS18600
When it comes to designing engines expressly for the F3C competition, the OS pedigree goes back a long way. That experience and the never ending quest to produce the best engines in the world, has culminated in the new Max 91HZ Ring.
With improved hovering stability as well as greater power at high speed, the new Max 91HZ meets and exceeds the extreme demands of today's complex F3C competition manouevres. The new design piston and crankshaft brings reduced vibration to provide improved and more stable torque over the entire RPM range.
The rectangular, heat-sink head is designed to be completely enclosed inside the helicopter fan shroud for better cooling in a fully enclosed body. The black 'alumite' finish with O.S. and 91HZ logos imparts a distinctive image for this latest engine in the OS competition helicopter lineup. An integral back plate heatsink improves crankcase cooling as a result of that extra power. This, and a thermo insulator installed on the carburettor mounting spigot, helps shut out engine heat to the carburettor, which in turn ensures a stable fuel/air mixture.
A needle control lever with O.S. Engines logo is supplied with the engine as standard since it is widely used in the F3C competition when in flight adjustment is required.   
Specification

• Weight:    618g
• Displacement:    14.95cc
• Bore:    27.7mm
• Stroke:    24.8mm
• Power Output:    3.4PS @ 15000RPM
• Practical RPM:    2000 - 16000

O.S. MAX 91RZ-H Ring    L-OS18500
Technically identical to the 91SZ-H but with a rear exhaust layout that suits some normal or scale machines better than a side exhaust.

O.S. MAX 91RZ-H DH Ring    L-OS18510
Technically identical to the superb 91RZ-H, but with the added convenience of a cast cylinder head that makes this engine perfect for use with scale type machines such as those available from Hirobo. This beautifully manufactured engine shares all of the advantages of its stablemates, smooth controllable power, exceptional throttle response, and immense torque. Legendary O.S reliability comes as standard.   
Specification

• Weight:    623g (21.90oz)
• Displacement:    14.95cc (0.91cu.in.)
• Bore:    27.70mm (1.090in.)
• Stroke:    24.80mm (0.976in.)
• Power Output:    3.3PS/15000RPM
• Practical RPM:    200-16000RPM

O.S. MAX 70SZ-H Ring    L-OS17000
Developed directly from the feedback received from top FAI and 3D pilots throughout the world, the MAX 70SZ-H Ring produces copious quantities of power across the rev range without sacrificing its ability to perform precision hovering. There's a stronger crankcase (with 6-point mounts), 3-needle carburettor and a revised liner/port design to give you the performance you need to beat the world! Particularly suited to the demands of 3D flight.   
Specification

• Weight:    553.5g
• Displacement:    11.5cc 0.702cu .in
• Bore:    25.8mm 1.016in.
• Stroke:    22.0mm
• Power Output:    2.5/16000 (BHP/RPM)
• Practical RPM:    2000-18000

O.S. MAX 55HZ Hyper w/P.Boost Pipe L-OS15638
The max 50SX-H Hyper has established an enviable reputation for power, reliability and ease of use. The Max 55HZ Hyper moves that to a whole new level!
Designed primarily with the demands of the 3D pilot in mind, the 55HZ Hyper delivers 61 size performance in a 46 size crankcase. That power comes from the extensive experience that OS has gained over many years and working extensively with the worlds top pilots to refine all aspects of the engine without compromise in any area.
By using the same mounting layout, you can drop a 55HZ into any model that previously suited the 50SX-H without modification. Just the area around the new carburettor is a little bigger and may require adjustmenst to the cooling shroud.
This entirely new engine shares almost nothing with the 50SX-H and has some new features not seen on an engine of this size before. The rear bearing is now designed to resist corrosion, the new 40L carburettor has three adjustments to cater for idle, mid range and full power. Until now, these features were the domain of 61 class engines or bigger. The throttle arm has four leaves so that push pull control is easy from any direction. The heatsink head is bigger for improved cooling as well.
For the first time, this O.S. is matched with a tuned muffler option part to extract the maximum performance from the 55HZ Hyper. Part number X-OS72144000.    
Specification
Displacement:    8.93cc (0.55cu.in)
Bore:    23mm (0.91in)
Stroke:    21.5mm (0.85in)
Practical RPM:    2000 – 20000

O.S. MAX 55HZ Hyper    L-OS15630
The max 50SX-H Hyper has established an enviable reputation for power, reliability and ease of use. The Max 55HZ Hyper moves that to a whole new level!
Designed primarily with the demands of the 3D pilot in mind, the 55HZ Hyper delivers 61 size performance in a 46 size crankcase. That power comes from the extensive experience that OS has gained over many years and working extensively with the worlds top pilots to refine all aspects of the engine without compromise in any area.
By using the same mounting layout, you can drop a 55HZ into any model that previously suited the 50SX-H without modification. Just the area around the new carburettor is a little bigger and may require adjustmenst to the cooling shroud.
This entirely new engine shares almost nothing with the 50SX-H and has some new features not seen on an engine of this size before. The rear bearing is now designed to resist corrosion, the new 40L carburettor has three adjustments to cater for idle, mid range and full power. Until now, these features were the domain of 61 class engines or bigger. The throttle arm has four leaves so that push pull control is easy from any direction. The heatsink head is bigger for improved cooling as well.
For the first time, OS is also offering a matching tuned muffler as an option part and has been optimised to extract the maximum performance from the 55HZ Hyper. Part number X-OS72144000.   
Specification

• Weight:    408g (14.39oz)
• Displacement:    8.93cc (0.55cu.in)
• Bore:    23mm (0.91in)
• Stroke:    21.5mm (0.85in)
• Power Output:    2.1PS @ 17000RPM
• Practical RPM:    2000 - 20000

O.S. MAX 50SX-H Ring Hyper    L-OS15550
The best '50-class' engine on the market just became amazing with the introduction of the new 50SX-H Hyper.
That CNC machined cylinder head has been developed to give better power and improved cooling at the same time. The new carburettor has also been improved to help extract more power than the standard engine without sacrificing the throttle precision you have come to expect from OS helicopter engines.
This truly is the 'best' engine in the 50-class and is fast becoming the best seller as well. It's an OS, what else would you expect!!   
Specification
Weight:    413g
Bore:    22.0mm 0.866in.
Stroke:    19.6mm 0.772in
Power Output:    1.8/17000 (BHP/RPM)
Practical RPM:    2000-20000

O.S. MAX 37SZ-H Ring w/o Drive Wash    L-OS14000
Following on from the concept developed in the 70SZ-H, the latest 37SZ-H brings a new level of performance to '30-class' helicopters.
Just about everything has been changed compared to the 32SX-H in the pursuit of power and control. That super-rigid crankcase contains a highly developed, ringed piston/liner set and optimised crankshaft for the right combination of power and smoothness. The new carburettor has been purpose designed for precision control and is capable of being operated by push-pull linkages if required.
This is the perfect engine to compliment your new Hirobo Sceadu Evo and move your flying on to a new level.   
Specification

• Weight:    293g 10.33 oz
• Displacement:    6.07cc 0.37cu in.
• Bore:    20.5mm 0.807in.
• Stroke:    18.4mm 0.724in
• Power Output:    1.4PS@18000 RPM
• Practical RPM:    2000-21000

O.S. MAX 32SX-H Ring w/o Drive Wash    L-OS12986
The ringed piston/liner assembly gives a lower compression on start-up without sacrificing top end power and performance, and provides easy needle setting characteristics.
Developed for small helicopters, the O.S. MAX-32SX-H is a design suited to beginners and experts alike, who appreciate the quality. With many of the design features of the larger, F3C competition standard engines, the high performance 32SX-H has a new design of large bore carburettor - type 20C - to provide stable hovering characteristics and more power at the top end. It also includes a plated crankshaft to prevent corrosion and to increase the engine's durability, a new rear ball bearing design with specially heat treated balls, enlarged con-rod and crank pin and a heat treated piston pin. With its ringed piston/liner assembly, twin ball raced crankshaft, enlarged cylinder head for improved cooling and mounting holes suited to most helicopters, the 32SX-H makes a worthwhile upgrade for any flyer.   
Specification

• Weight:    285g (ring) 10.05 oz
• Displacement:    5.23cc 0.32cu in.
• Bore:    19.5mm 0.768in.
• Stroke:    17.5mm 0.689in
• Power Output:    1.2PS@18000 RPM
• Practical RPM:    2000-22000

MP6 90 Size Muscle Pipe from Curtis Youngblood YEI-YP-MP690
Now a one piece pipe
Muscle pipe 6 90 has great power throughout the RPM range, smooth and snappy engine response good for both FAI and 3D flying styles. No extra mounting pieces needed.
Designed for the OS91 Engine (This will not fit a YS engine)

CJYE Crash Replacement Policy
Applies to MP5-50, MP5-50SB, MP6-90, Solid G, Mini G, ATG.
Offer: 50% crash replacement plus shipping.
Requirements: Receipt dated within 6 months of purchase
Contact: CJ Youngblood Enterprises Inc, e-mail us at crashreplacement@curtisyoungblood.com or call 979-779-2172 and ask for crash replacements. Only credit card payments are accepted.
Procedures: When you contact CJYE you will be given an RMA number. For a 50% replacement, present a photo of the unusable item along with the original purchase receipt from an authorized retailer.
In the photo:
Electronics: Cut off wires flush with the cases to show the item is not usable. Scratch your RMA number into electronics case.
Pipes: Hammer the exhaust stinger closed and dent the main chamber. Scratch your RMA number into side of pipe.
Note: Your RMA number must be visible on the product in the photo.

OUTRAGE HYPER RAGE 90 Muffler for OS Engine
Incredible power on T-REX 700N, Vibe 90 and other 90 size helicopters.This new version is designed with thinner muffler wall and high grade aircraft aluminum material that is stronger and lighter than the first version.  It boasts incredible 60g weight reduction.
These pipes are special one-piece designed to eliminate all o-ring wear-out and leaking which causes loosing performance.  It also has universal mounting for right or left side engine.
Specifications:
Length: 290mm
Diameter: 450mm
Weight: 230g with accessories (167g without accessories)
Features:
One-piece O-ring design to eliminate all o-ring wear-out and leakingExtended header length to avoid hitting fuel tank on T-REX 700 helicoptersReconfiguration with rigid baffle welding to avoid baffle loosing under vibrations.
Crash Guarantee:
One of the greatest advantages of HYPER RAGE 90 is its 50% crash replacement program. Fly hard, hit the ground, damage the pipe, take a picture of your non-serviceable or extremely damaged pipe and we will send you another new pipe at 50% off. No question asks. Give your helis the OUTRAGEOUS power it deserves and protect your investment with these crash replacement program. It's free!

OUTRAGE HYPER RAGE 90 Muffler XLITE VERSION - for YS Engine HR1129-XLT
Incredible power on T-REX 700N, Vibe 90 and other 90 size helicopters.
These pipes are special one-piece designed to eliminate all o-ring wear-out and leaking which causes loosing performance.
It also has universal mounting for right or left side engine.
Specifications:
Length: 305mm
Diameter: 450mm
Weight: 210g without accessories
Features:
New design with extra volume to extract more power out from the 91 YS engine
New thinner wall high quality aircraft aluminum to reduce substaintial amount of weight.
One-piece header design.  Eliminate the use of o-rings that wear out and leak
Extended header length to avoid hitting fuel tank on T-REX 700 helicopters
Reconfiguration with rigid baffle welding to avoid baffle loosing under vibrations.

Hatori SB-20FH "Matt Botos" Special for O.S. 91 HZ Muffler Pipe SB-20FH
This Hatori pipe is specially tuned for the NEW OS .91 HZ Motors and results in Huge Power!
Applicable for Helicopters: Front Head
Applicable for Engine: OS91HZ-PS

HE90H15 High Performance 90 Muffler OS/Align
The newest pipe from align specifically designed to fit all OS 91 and Align 91 sized engines. Please not this pipe will not work on YS engines (Hatori SB 19 works best)
Accessories:

• Pressure nipple x1
• Exhaust guide x1(13.5x18.5x79.75mm)
• Spacer x2
• Collar screw x2(M4x40mm)
• Spring Washer x2
• Strap x 1(100mm)

OS Power Boost Pipe - 55HZ    X-OS72144000
Tuned muffler system especially designed to match to the new MAX 55HZ Hyper.
(Note: Engine not included)

OUTRAGE HYPER RAGE 56 Muffler for YS 56/Novarossi 57 Engines HR1159
OUTRAGE high performance muffler HYPER RAGE 56 is designed to offer outrageous power to all 50 size helicopters. With incredible amount of power, the HYPER RAGE 56 adds much more power to the most popular 56 engines such as YS 56, Novarossi 57... Not only squeezing out the power to the engine, this HYPER RAGE 56 also keeps the noise down to minimum level. Designed and intensively tested by OUTRAGE RC, these pipes offer highest quality at affordable prices.
Incredible power on T-REX 600N, Vibe 50, Velocity 50 and other 50 size helicopters.
Specifications:
Length: 11" (280mm).  (From tip to tip: 290mm)
Diameter: 2" (50mm)
Crash Guarantee:
One of the greatest advantages of HYPER RAGE 56 is its 50% crash replacement program. Fly hard, hit the ground, damage the pipe, take a picture of your non-serviceable or extremely damaged pipe and we will send you another new pipe at 50% off. No question asks. Give your helis the OUTRAGEOUS power it deserves and protect your investment with these crash replacement program. It's free!
Pipe Includes (2) Mounting Bolts, Deflector, and Zip Ties.

OUTRAGE HYPER RAGE 55 Muffler for OS.55/Align 55H Engines
HR1161
Specifications:
Length: 11" (270mm).  (From tip to tip: 280mm)
Diameter: 2" (50mm)
Crash Guarantee:
One of the greatest advantages of HYPER RAGE 55 is its 50% crash replacement program. Fly hard, hit the ground, damage the pipe, take a picture of your non-serviceable or extremely damaged pipe and we will send you another new pipe at 50% off. No question asks. Give your helis the OUTRAGEOUS power it deserves and protect your investment with this crash replacement program. It's free!
Pipe Includes (2) Mounting Bolts, Deflector, and Zip Ties.
OUTRAGE high performance muffler HYPER RAGE 55 is designed to offer outrageous power to all 50 size helicopters. With incredible amount of power, the HYPER RAGE 55 adds much more power to the most popular 55 engines such as OS.55, Align 55H ... Not only squeezing out the power to the engine, this HYPER RAGE 55 also keeps the noise down to minimum level. Designed and intensively tested by OUTRAGE RC, these pipes offer highest quality at affordable prices.
Incredible power on T-REX 600N, Vibe 50, Velocity 50 and other 50 size helicopters.
Special design steel threaded insert to prevent manifold header stripping.

OUTRAGE HYPER RAGE 50 XLITE VERSION - for all 50 size helicopters HR1099-XLT
Incredible power on T-REX 600N, Vibe 50 and other 50 size helicopters.
Specifications:
Length: 10" (250mm).  (From tip to tip: 260mm)
Diameter: 2" (50mm)
Crash Guarantee:
One of the greatest advantages of HYPER RAGE 50 is its 50% crash replacement program. Fly hard, hit the ground, damage the pipe, take a picture of your non-serviceable or extremely damaged pipe and we will send you another new pipe at 50% off. No question asks. Give your helis the OUTRAGEOUS power it deserves and protect your investment with these crash replacement program. It's free!
Pipe Includes (2) Mounting Bolts, Deflector, and Zip Ties.

Curtis Youngblood MP5- 50 Sized Muscle Pipe YEI-YP-MP550
This is the MP 5 50 Size Muscle Pipe from Curtis Youngblood Enterprises. The latest addition to the Youngblood Products line, The Muscle Pipe 5 50 provides more power than the previous MP2 version. The MP 5 50 is a one piece muffler that gives a big power boost over any standard 50 size muffler. It is a great way to get that extra performance and stay within your club noise limits and your budget.
Features:
Works with OS and YS engines
Works for 50 size engines
Works well with or without a governor
Includes all mounting parts for OS, YS and Thunder Tiger
Mounting works on forward or rear facing engines
Runs well on nitro levels from 5% to 30%

Hatori SAB-50-3D "BOBBY WATTS" Special Muffler For O/S Hyper and YS SAB-50-3D
This is the new one-piece Hatori SAB-50-3D Bobby Watts Special Muffler for the O.S. 50 Hyper and YS 50 helicopter engines. This high volume muffler and includes standard hardware for mounting the muffler to the engine.
It is quieter and more powerful than any other 3D pipe - believe me! Specifically designed and tested for the O.S. 50 Hyper and YS 50 by top US pilots, this pipe produces great power at a wide range of RPM, especially at the high RPMs required for todays grueling 3D!
Most top pilots run this pipe at 2000rpm!

HE50H08 50 High Performance Muffler
Apply to 50 size helicopters, according to the strength character of 50 engine to design, features the highest air exhaust volume on the market.
Great design and test to three spaces: expansion chamber, accelerated section, silencer chamber, high efficiency and the quick respond of medium speed and high speed, great for 3D flying.
Accessories

• Pressure nipple x1
• Tube stopper x1(Φ13xΦ16x18.5mm)
• exhaust guide x1(Φ16.5x79.75mm)
• Spacer x2
• Collar screw x2(M3x35mm)
• Spring Washer x2
• Size:41.2 x 270 x 70.5mm

Hatori SAB 6RS "BOBBY WATTS SPECIAL" O.S. 37 Tuned Muffler - Raptor 30/Sceadu Evo 30 SAB-6RS
This is the Hatori SAB 6RS 3D Tuned Muffler "BOBBY WATTS SPECIAL" for the O.S. .32-.37 engines.  This muffler will give you increased power on both the .32 and .37 OS engines. It will work with the Raptor 30, Sceadu Evo 30, and other 30 size helicopters.

YoungBlood Muscle Pipe MP5SB - 50 Size New Model YEI-YP-MP550SB
This is the latest version of the popular mp5 series exhaust system for the 50 sized glow engines. The SB refers to "stick banger" edition themed much like the SB blades. This pipe is for the 3d pilot looking for that added power and engine response in the mid-range so they can "stick-bang" to their hearts content.

YoungBlood MP2/MP5/80/90 Gasket YEI-MP250
YoungBlood MP2 80/90 Gasket

Rex H5 Muffler + Header Set (50357+40358) for Heli. 50/60 Engines for T-Rex 600 or others Carbon Frames Helis 50357-358
NovaRossi Rex H5 Muffler + Header Set (50357+40358) for Heli. 50/60 Engines for T-Rex 600 or others Carbon Frames Helis