Trex 700 Gasser - Zenoah PUH Engine






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 Helibug HB7-PUH-V2 Gasser Conversion for Trex 700

Helibug HB7-PUH-V2 for Trex700

product image  Item Name: Helibug HB7-PUHConversion kit for Trex 700 for Zenoah PUH Series of Engines
 Item Price: $429.99   DISCONTINUED
 Item SKU:   HB7-PUH

   with 16T Pinion
  with 17T Pinion
  with 20T Pinion
Product Description Helibug HB7-RC Gasser Conversion for Trex700 using Zenoah RC Series of Engines
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HB7-PUH-V2 Gasser Conversion Kit for Trex 700

Designed to convert Trex 700 Nitro into a Gasser Helicopter using Zenoah PUH Series of Engines

(Zenoah G231-PUH or G260-PUH)


Align Trex700 Clutch bell with Blue Liner

The new clutch bell from Align with a 'blue' clutch bell liner is the best upgrade from Align. This clutch bell uses thicker clutch liner. It has a much better gap between the original Trex700 Nitro Clutch and the Clutch Bell.

I highly recommend using Align Trex700 Clutch with the NEW Align Trex700 Clutch bell

There is no need to upgrade to Lynx Gas Clutch as original the "Gap" with the older Align Clutch bell was unacceptable for gasser performance. Also, there is no need to fix any tolerances for the Trex700 clutch to fit into the bell as it is factory adjusted for the best performance.

100% compatibilty with the Trex700, flyers can benefit from not only Lynx Gas Clutch, but, also QuickUK standard and HD clutches along with the Lynx stock Trex700 Clutch.  More choices of clutches to choose from !

This applies to All Helibug Gas Connversion Kits which uses Original Trex700 Mechanics

This kit is designed to convert Trex-700 Nitro into Gasoline powered Helicopter using Zenoah G260-PUH engines
Here are some of the key points which makes this conversion kit different from others:
Designed for Zenoah PUH Series Engines (G231-PUH OR G26-PUH)
Excellent Balance and Performance
Same size frame as Trex-700
No Vibrations
Delrin CNC Fan with 14 Fins, 1" High
2.3mm thick G10/FR4 Highest quality material used for side frames and Fan shroud mount
6.5mm thick G10/FR4 Base Plate
Relocated Throttle Servo
Single Piece Pinion Gear design
20T, 17T and 16T Mod-1 Pinion for Excellent Mesh with the MicroHeli Main Gear
5.75 and 6.76 Gear Ratio
115T Module-1 Main Gear Used from Align
This kit uses all stock parts from Align - There is nothing you need with this kit
Adjustable pinion mount and base plate mount holes to accommodate 16T, 17T or 20T pinion

Kit Includes :
1.  Main Frames
2.  Base Plate
3.  Clutch mount
4.  Throttle Plate
5.  4x M4 10mm Screws for Pull start
6.  4x M4 12mm Set Screws for Delrin Fan on Clutch mount
7.  2x spacers for Fan Shroud
8.  4x Screws for Fan Shroud
9.  4x G10 Fan Shroud Mount Links
10. Fan Shroud
11. 17T or 20T Pinion
12. Align or Microheli 115T Main Gear
13. Delrin Cooling Fan
14. Two Flange Bearings for Main Frames

Choosing the right Pinion (Gear ratio) for your Flying Style

This is the most common question we receive from Buyers...."Which Pinion should I buy?"
Here is a brief selection criteria you should use when buying this kit.

16T Pinion (7.18 Gear Ratio)
16T Pinion is best for sports/mild 3D flying, so if you are a sports/mild 3D flying, it is highly recommended to use this gear ratio.

17T Pinion (6.76 Gear Ratio)
17T pinion is best for sports and a good level of 3D flying. so, if you are a 3D pilot/sports flyer, this gear ratio is best for you.

20T Pinion (5.75 Gear Ratio)
20T is only made for Extreme 3D Pilots. Although you can fly sports with 20T pinion but, its not recommended to use this gear ratio for sports flying.

Please note, if you plan to use a Modified RC Engine, than its highly recommended to use 16T Pinion (7.18 Gear Ratio)
My personal recommendation is to use 17T Pinion for all flying styles !



Conversion Step Reference


WARNING: The radio controlled model helicopter built from this conversion kit is not a toy and is not meant for children. It is a flying machine capable of causing property damage and serious bodily harm to both the operator/assembler and/or spectator if not built and operated correctly and responsibly. Rotating components, especially the main rotor blades, are an ever-present danger. Model helicopters operate differently than model cars and airplanes. Helicopters by their nature are not positively stable, meaning that even if properly assembled and adjusted, helicopters will not recover from an unwanted flight attitude, nor will they hold any particular orientation without constant control inputs from the pilot.


HELIBUG has spent considerable time making this product reliable and easy to build, but only the operator can insure that it is safe. Because the safe operation of this helicopter is beyond the control of the Manufacturer and distributor, the owner/operator assumes all risk of use.

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