Gru-Bee Avenger 85 engine with OCDT Easy Start function.   Not available anywhere else.   Order our OCDT separately.

This A85 BASE Stock engine is for builders who desire to do cylinder porting and procure their own Expansion Chamber Exhaust along with the Carburetor, CDI and HP Head of their choice.     

SkyHawk Premium Avenger 85cc Engines are now in stock for immediate delivery.

Includes Fine Wire 450 ohm Coil and Plaid Pattern marked Neodymium Rotor for a high-performance Ignition system.  

Due to request from USA engine builders who want to choose special parts, we sell this engine without any Muffler, CDI, Head or Carburetor!  This allows you to choose the external components you want without paying for something you don't want. 

After a year of observation and testing we have finally approved the Avenger 85 engine that the YuanDong factory in China has been making for the past year. 

Regardless as to what some people may say YuanDong is the exclusive CHINESE manufacture of the Avenger engine.  The same factory that has always made our SkyHawk line of 2 stroke engines for over 21 years.   

  Look for the YD logo on both halves of the crankcase to ensure authenticity.       Other Chinese factories will soon learn to copy the YD Avenger 85 cylinder design so beware.

What does Premium mean? > WE INCLUDE OUR EXCLUSIVE RIGHT SIDE FLIP WINDOW ENTRY FOR OCDT CORDLESS DRILL ENGINE STARTING WHICH IS A GRU-BEE EXCLUSIVE FEATURE. 

NOTE: THE OCDT IS NOT INCLUDED IN THIS AD, SOLD SEPERATELY. 

The Avenger 85 is a true 85cc displacement HIGH PERFORMANCE 50 MPH Plus engine with a 52mm bore and 40mm stroke.   

Yes, this engine competes directly with the Phantom 85 and SP Menace 85 sold by our friendly competitors. 

FYI:  Gru-Bee has elected to NOT SELL the standard A85 cast light weight engine head along with this engine which allows the customer to choose the CNC Billet head they want.    

We have designed a HP CNC billet head that gives optimum performance and cooling.  Sold separately:  

We recommend the end-user purchase of a quality plenum expansion chamber exhaust system like that made by Wali at RHM, 

For those who do not demand extreme performance but want to diminish exhaust DB's sound level we offer a plain jane chrome header pipe with 1/2npt threads to enable screwing in a Briggs and Stratton lawn mower engine muffler available at local Hardware stores like Tractor Supply or ACE Hardware.  Light weight and sturdier than the OEM Avenger 85 riveted version but maybe not so quiet.   See Pic. Sold separately. 

The engine retains the stock 25-degree timing.   Our Red Devil HP CDI matches the inside magneto parts. 

Order CDI separately. 

Premium SkyHawk 5 Features:

• Included is our HIGH FLUX DENSITY NEODYMIUM TZ ROTOR MAGNET IDENTIFIED BY THE EXCLUSIVE CROSSHATCH PATTERN.   

• To avoid a mix match, it is Important to have a balanced ignition system from the same manufacture.  

• Included is our FINE WIRE HP TZ MAGNETO COIL THAT SPECS OUT @ 440 TO 450 OHMS AND HIGH FLUX DENSITY ROTOR MAGNET.   

Our Avenger 85's have a Flip Window Electric cranking system that allows a 20V Handheld Cordless Drill Cranking with OCDT (Overrunning Clutch Drive Tool ). 

NOTE: The OCDT is sold separately.  

•  WE NOW OFFER A 12 ROLLER HIGH SPEED NEEDLE BEARING AS AN AFTERMARTKET PART UPGRADE.

Gru-Bee SKYHAWK AVENGER 85 features: 

• 52MM DIA. SINGLE RING FLAT TOP PISTON. 

• 12MM DIA. WRIST PIN 

• 10 ROLLER NEEDLE BEARING on Wrist pin. 

• IMPROVED HIGH SPEED CRANK NEEDLE BEARING. 

• BALLANCED 8-hole CRANK. 

• INCLUDES A SPECIAL HARDENED B5 CRANKSHAFT BEVELED GEAR

• INCLUDES 8 HOLE BALANCED CRANK.  ( 4 Holes per flywheel. )

• INCLUDES a COPPER HEAD GASKET. 

• INCLUDES HEAVY DUTY CLUTCH SPRING. 

• INCLUDES HIGH QUALITY SEALS AND BALL BEARINGS.

•  Right Side HANDHELD DRILL CRANKING ABILITY. ( ORDER OCDT SEPERATELY )

My Wife's retired brother inspects at the factory what you expect and yes that's not 100% perfect but it's a lot better than no inspection at all when you consider piece worker's pay is the same for making defects as it is for making zero defects.    

NOTE:  If any USA DEALERS with Import and Sales tax credentials wish to place an order for 100 or more 85 AVENGERS with or without OCDT we can quote factory direct wholesale prices via our Gru-Bee inc. owned Chinese trading company Changzhou China GAS.   They will have to be ordered as YD85 to avoid internet fussing!