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Distributed exclusively in the USA by: Nationwide Access.  www.gasbike.net 

PLEASE READ THESE INSTRUCTIONS BEFORE INSTALLATION  

   

 

 

www.grubeeinc.com

     

These

 

Instructions are Copy Righted:

     Rev. Oct 24,  2010

 

 

 

 

YuanDong

  

SkyHawk

 

 

 

    GT2A       

>

 48cc / 40mm x 38mm bore and stroke: Center Fire Sq. Head. 

    GT2B       

>

 48cc / 40mm x 38mm bore and stroke:  Angel Fire Rd. Head. 

                            GT2-SM  > 48cc / 40mm x 38mm bore and stroke:  Angle Fire Sq. Head;  
                            GT5         > 66cc / 47mm x 38mm bore and stroke:  Center Fire Sq. Head; 
                            GT5-SR   > 66cc / 47mm x 38mm bore and stroke:  Angle Fire Sq. Head;      

Kit Box Contents: 

2 cycle gas engine with dual needle bearing:    Black Catalytic exhaust muffler;   Tear Drop 2.5L Fuel Tank 
plated  inside;      Bicycle  ½”  x  1/8”  drive  chain;    Chain  guard;      44  tooth  Sprocket  with  9  hole  mounting 
hardware  for  36  spoke  wheel;      Ball  bearing  chain  idler:    Push  button  clutch  lever,    CNS  premium  EPA 
approved carburetor with external choke control:  New design CD Ignition,    Twist throttle with integral kill 
switch:  Tool kit with Extra spark plug; Extra mt. block, Extra head gasket:   

To ensure continued engine performance: DO NOT use other than original SkyHawk replacement parts. 

 Note:

    Failing  to  follow  these  instructions  when  installing  a  certified  engine  in  a  piece  of  non-road 

equipment violates Federal Law 40CFR-1068.05 (b) and is subject to fines or other penalties as described in 
the Clean  Air Act of 1970.    Mechanical aptitude and ability is required to perform this installation. Many 
“do  it  yourself”  backyard  mechanics  will  find  this  project  rewarding.    A  love  of  small  engines  is  the  only 
required  catalyst  for  this  project.    However,  installation  is  sometimes  best  done  by  a  professional  auto  or 
motorcycle  mechanic.  Frame  size  should  be  28mm  to  30mm  dia.  with  70  degree  included  V  angle.  For 
sufficient engine clearance  select a  bike with a seat tube  length of at  least 12 ½  inches  measured  between 
bottom of top tube and top of pedal sprocket tube.  A rewarding  joy and challenge  is  found  in designing a 
custom installation of your own.  Remember, a quality installation is paramount to safe usage and long term 
satisfaction.  You may find many uses for this engine kit from stationary machine power to off road riding 
machines.   Have fun and good luck on your motorized project.    Happy trails to you from China GAS: 

 

 STEP #1     Mounting the Engine:  

 

1.

 

The engine mounts in a 70 degree angle  “Vee” tube frame.  It is best to make sure all 4 engine studs are 
securely bottomed out in the engine before mounting.   Use a Jam nut procedure to tighten. 

2.

 

Consider using Masking or Duct Tape on the front down-tube & seat tube of your bicycle to protect the 
paint finish while test fitting the engine to your donor bike.  If the distance between the two frame tubes 
exceeds the engine mounting span then additional spacers or welded brackets may be required.   Mount 
the engine to the seat tube first and then fit to the front tube.   If frame tube fit is smaller than engine 
clamp dia. use strip shims to fit.   See figure one for example of installation on a wide frame bike..   

GT2A 

GT5 

GT5-SR 

Summary of Contents for GT2-SM

Page 1: ...stallation Many do it yourself backyard mechanics will find this project rewarding A love of small engines is the only required catalyst for this project However installation is sometimes best done by...

Page 2: ...ept 6mm bolts or 1 4 US thread depending on your choice of bolt For the left hole use the furnished large down tube adapter to determine placement of the hole The measurements for the two right wholes...

Page 3: ...over Keep as low as possible Beach Cruiser bike frames work good as well as do the classic 70 degree Old time European style Note Front mount size is different with new 203 brg block engines versus ol...

Page 4: ...and mounts on axel hub on the left side of the rear wheel against the spokes dish side in The sprocket must fit over the hub in a perpendicular plane with the axle This insures that your rear chain s...

Page 5: ...rrect length Special tools are required to remove and replace the master link when shortening the chain by removing links Ideally both your pedal drive chain and your engine drive chain should have th...

Page 6: ...ing to engine and wheel axle struts Ignition Coil and Engine Kill Switch installation A Mount CD ignition coil on bike frame close enough to attach coil wire to spark plug Mount as far away from exhau...

Page 7: ...lutch plate out similar to a car clutch Releasing the handle bar lever engages the clutch and provides engine torque to the drive chain or to start the engine The friction of 15 pads on the clutch pla...

Page 8: ...8 GT5 and GT2A models with external CDI use this kill switch hook up...

Page 9: ...ctions and tape with black electrical tape The remaining white wire from the engine is not needed unless you want to run a small wattage 6V headlight but it s not recommended as it will rob engine ign...

Page 10: ...wires so as to fire the spark plug at the right time Engine firing timing is not adjustable Position of rotor is fixed to ensure correct timing If engine does not fire at start up check all bullet con...

Page 11: ...the long groove on the slide valve Cable comes hooked up to carb for trouble free installation Note component positions in pictures Needle clip is factory set in second slot The spring is placed insi...

Page 12: ...break in period 1st gallon of fuel the ratio is 16 to 18 parts gasoline to 1 part oil After the break in period the ratio can increased to 25 parts gasoline to 1 part oil NOTE Synthetic 2 Stroke Oil c...

Page 13: ...primary 10T drive sprocket secure sprocket from moving and remove nut Screw in puller tool to the threads in sprocket internal ID Tighten puller tool securely Hold tool with end wrench while using ra...

Page 14: ...If you need a replacement muffler contact your dealer 2010 models have an air shield welded on the outside of muffler again per EPA rulings This insures hot run so catalysis can clean the exhaust C C...

Page 15: ...at the end of the choke cable All the way Up the choke is on All the way Down the choke is off Move progressively downward to off position during engine warm up period Engine Starting procedure for L...

Page 16: ...inspection and only the defective part or parts will be replaced not the complete kit or engine Only the defective part or parts should be returned to the selling dealer for warranty replacement cons...

Page 17: ...dealer for the China GAS Model 2 HD axle kit Complete assembled Rear Wheels for 1 speed or Multi speed 26 bikes are available Pull 2 pins to pedal with no restriction and stick them back in to motor A...

Page 18: ...es Federal Law 40CFR 1068 05 b and is subject to fines or other penalties as described in the Clean Air Act of 1970 Parts Reference When replacing the spark plug in an Angle Fire head it s best to use...

Page 19: ...19 GT5 and GT2B GT2 SM GT5 SR...

Page 20: ...20 CNS Carburetor p n C 32CNS66 EPA...

Page 21: ...e rust from occuring 4 Long Short expansion chamber racing exhaust Improved catalytic muffler for 2010 EPA requirements with twice the size of palladium insert plus an outside air shield Two psc STREE...

Page 22: ...22 44T REAR WHEEL Drive Sprocket...

Page 23: ...23...

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