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O.S. 55HZ-H Hyper Ringed .55 Helicopter Engine

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This is the OS 55HZ Hyper Ringed Helicopter Engine with the 40L Carburetor.




Best suited for 3D flight! Amazing power equal to 60 size engine changes the common knowledge of the 50 size helicopter engines! It can be installed in the 50 size helicopter without modification due to the same mounting bolt pattern and silencer installing size as the 50SX-H Hyper. New rear bearing is employed for improved anti-rusting, higher durability and more stable high speed running. Newly designed 40L carburetor features twin needle. A best fit new silencer will be available at the same time.

This enables to adjust hovering and high speed independently. Four armed throttle lever is employed to synchronize with servo stroke of various brand servos.

Most major internal parts are newly designed pursuing the best performance required for the 50 size helicopters.
The first helicopter muffler from O.S., PowerBoost Pipe 55 will be available at the same time. This pipe develops 100% performance of the 55HZ Hyper

Ideal for 3D flight-power equal to .60 size heli engines
Same mounting bolt pattern and silencer size as the OS 50SX-H Hyper
Dual needle 40L carburetor allows independent adjustment of idling,
hovering and high speed with four arm throttle lever for use with
a variety of servo brands
HZ Hyper low profile black aluminum six fin cylinder head
Two year limited warranty through manufacturer beginning at the date
of purchase

INCLUDES: OS 55HZ Hyper Ringed Helicopter Engine with 40L Carburetor, #8 glow
plug and instruction manual

REQUIRES: 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix)
Exhaust system such as the OS PowerBoost Pipe, OSMG2880
Starting equipment

SPECS: Displacement: 0.55 cu in (8.93cc)
Bore: 0.91\" (23mm)
Stroke: 0.85\" (23.5mm)
Practical RPM: 2,000-17,000 RPM
Weight: 14.39oz (408g)
Carburetor Settings:
High Speed Needle Valve, Two turns open from fully closed
Idle Mixture Control Screw, Factory set-do not adjust
Medium Speed Needle Valve, Two turns open from fully closed
Distance/top of cylinder head-bottom of mounting tabs: 2.8\" (72.6mm)
Distance between mounting holes same side: 0.68\" (17.5mm)
Distance between mounting holes opposite side: 1.73\" (44mm)
Distance between muffler mounting holes: 1.4\" (37mm)
Cylinder Head Diameter: 1.8\" (47mm)
Distance/bottom of crankcase to top of cylinder head: 3.6\" (90.9mm)
Distance from center of engine to front bearing: 2.03\" (51.6mm)
Distance from center of engine to end of Crankshaft: 3.2\" (82.6mm)
Distance from center of engine to backplate bolt: 0.98\" (25mm)
Distance from center of engine to throttle lever: 1.5\" (38mm)

Warranty, Returns & Support

Warranty Information

We truly thank you for your purchase, and when things go wrong, we are here to help in any way that we are capable of doing so.

In regards to any warranty related matter, please reference the below information to help understand our warranty policies, as these warranty policies are absolute when it comes to any purchase made via HeliDirect.

Warranty Time Frame

Regarding product(s) purchased via HeliDirect, each manufacturer has their own specified warranty time frame, and HeliDirect holds the sole right to direct the customer to the manufacturer for stated warranty support in regards to manufacturer's that require direct level warranty support.

Our stated (14) day return policy directly relates to brand new, unused products being returned for a refund or store credit, and does not relate to warranty related situations for faulty product(s). Faulty, damaged or problematic items are handled upon a case by case basis, and will be detailed below based upon the warranty options available.

Our team at HeliDirect is highly motivated to assist in every possible way regarding warranty support, but please be 100% aware that warranty support for the product(s) you have purchased may be handled directly via the manufacturer, and not through HeliDirect.

If your product(s) involve direct manufacturer support, we are still available to assist. We ask that the customer make the initial manufacturer contact for warranty support, but in the case where a manufacturer response is not receive within (5) business days, HeliDirect will step in upon your behalf, utilizing our channels to assist you with this manufacturer based support.

In the above case, HeliDirect will do everything in our power to make sure the manufacturer assists you directly, but please note that all such warranty in regards to an issue like this will still be directed through the manufacturer.

Warranty Related Issues

Please note that HeliDirect is not a warranty repair center, nor do we offer warranty regarding many items we resell. Product(s) purchased via HeliDirect are subject to the original vendor’s repair / replacement warranty policies & timelines, and will be directed to the manufacturer at our discretion.

HeliDirect will not assume responsibility and / or liability for any manufacturer defect, or damage due the use / misuse of the product(s) purchased. Further, HeliDirect cannot / will not be held liable for ancillary damage to product(s) based upon a manufacturer fault or defect. All such issues will be dealt with at the manufacturer based level.

If your item is found to have a fault or defect after installation or use, your product may be subject to warranty repair via the original manufacturer, no matter what the purchase date may be. HeliDirect does not cover repair, replacement or warranty via used / installed products. All such issues will need to be dealt with at the manufacturer level.

Damage Due to Ancillary Product Failure

In regards to damage that directly results to a failed product installed in conjunction with another product, we are happy to assist in terms of warranty support for the product that has failed, but please be aware that we cannot be held liable for ancillary damage to other items or components that may have been damaged due to the original product failure.

Warranty Returns

If your product is approved by our customer service staff as a valid return that we will handle directly, please note the below information regarding all such approved warranty items sent to HeliDirect.

- Any item(s) approved for return to HeliDirect will be subject to inspection and or testing to verify the noted information provided by the customer regarding the flaws, faults or damage.

- Due to the various aspects of testing, repair and other return processes, please be aware that any such approved return will require (2) to (5) business days for proper processing. Our staff will certainly do all that we can to reduce this time to the bare minimum, but please be aware that the return process can take up to (5) business days to complete.

- If the product(s) approved for return are deemed faulty by our returns specialists, we will proceed with a repair, exchange, credit or refund based upon the situation at hand. All such information will be communicated to the customer before any re-shipment is made.

- If an item that encounters a warranty issue after usage, HeliDirect may opt to repair the product versus an exchange, as exchanges can only be made for valid warranty relating to products that have no use of flaws. Our staff will be sure item is in 100% working order based upon any repairs, but exchanges, credits or refund cannot be offered for items under warranty that have been used and are no longer able to be sold as new.

- In the case of product(s) returned to us that test to be non faulty, the product(s) will be returned to the customer in the condition received. Our staff will reach out to the customer with necessary information regarding what may have been missed, and what steps to take in order to utilize the product(s) effectively.

- For non faulty diagnoses of returned product(s), refunds, store credits or exchanges cannot be offered, as the product(s) received cannot be sold as new and unused.