#2. Don Butler FULL RACE 70cc Minarelli Cyl. SkyHawk with OCDT.

Grubee Inc


Free USPS Priority large box Flat rate shipping. 

Here's a world-famous old codger Don Butler Speed Shop hand-built Minni-Max SkyHawk Gt5A-ES 47x40 engine with a Minareilli clone cast iron 70cc vertical cylinder, CNC HP head, VM22 Mikuni carburetor and including a Dorsey DHL model M SAF super duty 3 spring clutch

An a OCDT is included > a $39.95 valve!

The VM22 carb is directly attached to an Aluminum CNC cut manifold that is securely mounted with (4) M6 screws instead of two like found in other installations where the carb bounces around on the end of a rubber hose and soon fails.   

This high horsepower modified engine has a $125 DHL SAF clutch, installed and tuned.  Why?  The power this puppy makes will soon smoke and slip a standard 15 pad China Doll clutch.   

Don Butler's Speed Shop is in Chickasha OK. and he will ship from his garage straight to your door. 

 Here's what he does to deserve the bargain price he charges which includes free USPS priority USA shipping > $22-dollar valve!

Step 1.  We deliver our SkyHawk Gt5A-Es engine to Don's Shop.  $159.95   You can check out all the salient features of our engine at our SkyHawk Gt5A-ES engine add here-in.   

Step 2.  Don completely disassembles the engine, checks and balances the CRANKSHAFT ASSY.   The Dual Crank flywheels will have 5 holes in each side instead of 2.   This is a $85 balance job.

Step 3.  Don buys a Minarelli 70cc vertical cylinder / 47mm piston and a flat reed valve.  

Step 4.  Don buys a DLH CNC billet cut manifold.   I'm guessing this cost maybe $50.   The addition of a DLH SAF Model M clutch adds in another cost of $125. 

Step 5.  He does a porting job on the cast iron 47mm bore cylinder and checks the squish to assure 0.09 to 1.00mm.   A good porting operation is what makes this engine run like a scared deer! 

 So, what's this two-hours of his "Know How" labor worth?   Go figure. 

Step 6.  He re-assembles and shim aligns the engine crank with new 2 stroke C fit engine bearings and new oil seals. 

Note:  (The 6202-1RS Crank Bearings are installed with their rubber seals on the outboard side and have open balls on inboard side for lubrication.   

Don says Ball Bearing seals on the outboard side helps keep crankcase pressure from leaking which is one of the major problems with all China doll engines.)   

So, What's this 2 or 3 hrs. of "Know How" labor worth?  Small engine shops charge $75 per hour.  

7.  When all done he does a run test that confirms starting and run ability with a dedicated in house Carb and CDI.    

8.  Don includes a new VM22 Knockoff Mikuni carburetor and AC in the box with your engine. 

Disclaimer:  Due to not being able to ship a carburetor which had gas in it he is unable to pre-tune adjust the included carb so you have to learn how to do that on your own.  

9.   In with the engine is a TZ HP CDI module made by the same factory that makes the magneto rotor and coil so all 3 match in concert.    A miss-matched CDI and rotor magnet is one of the reason some China engines run poorly.  

Added it all up, the hard tedious work is all done for you.     

This little rice grinder is ready for a drop in frame job when you get it.  100% Guaranteed to run when installed correctly.    

NOTE:  Using our OCDT assures you can electrically drill start this puppy instead of a heart attack pedal start.  

If you need a front mount shim kit or an installation kit for this engine that includes: a gas tank, sprocket, cables, throttle, clutch lever, etc. we sell an I-kit separately here in that includes all these items. 

Our HD axle wheel would give you a Pro-Shop installation.  Some, not all, die cast aluminum mag wheels with disc brake M5 pattern sprockets have been known to bust out the sprocket screws with this amount of engine power on some cheap wormy castings.

Check it all out by viewing all the pics. 

Please understand that engine rebuilding is not an instant process so it will take time to complete based on Don's work load and his parts inventory but rest assured it will be done in reasonable time by the most professional bike engine builder in the industry.