PlanetMinis Forums banner

72cc Race Head (23/20mm) Kits for $135!

7.8K views 29 replies 15 participants last post by  crf50luke  
#1 ·
Image




Image




$135 for the complete kit.



This 72cc big bore kit will fit the following models:



Honda:

-CRF50 and CRF70

-XR50 and XR70

-Z50R 1982-1999

Lifan:

-50cc and 70cc Motors

Zongshen:

-50cc and 70cc Motors

All other 50-70cc Pit Bikes and ATV's with replica Honda horizontal motors





THIS KIT DOES NOT FIT Z50 ENGINES PRIOR TO 1982! (Piston/Cylinder Kits are coming soon for the "short rod" pre-'82 motors!)





Increase your displacement on 50cc models, or freshen up your tired 70cc top end. Get the RPM's you can't achieve with a restrictive 50cc cylinder head, or replace your damaged 70cc head. This is the only kit with a 47mm ALUMINUM cylinder on the market. Aluminum cylinders dissipate heat more efficiently and weigh considerably less than the cast iron competition. This all-new completely assembled cylinder head uses a 23mm intake valve and 20mm exhaust valve similar to the XR/CRF70 head. The cylinder heads will include all engine covers EXCEPT the round cam cover. You will simply re-use your stock one. A high volume oil pump is also included for the 50cc models. Individual kit components are available upon request! Email me if you are just looking for a 47mm cylinder/47mm piston kit/70cc top end gasket kit/or anything else you see. Replacement parts are in stock if you need them.



This Kit Includes:

-47mm piston/cylinder kit (including rings, wrist pin, and circlips)

-47mm complete top end gasket kit

-23/20mm valve race head. (assembled with all covers minus the round cam cover)

-High Volume Oil Pump (recommended with use of any race head on 50cc engines)







Link to product on site - Ahp Minis





Individual component prices:



72cc gasket kit - $10

47mm piston kit includes rings, circlips, pin - $25

47mm Aluminum cylinder - $40

HV Oil Pump - $19

Assembled race head, 23/20mm valves - $75







Contact and paypal - mark@ahpminis.com or 610-417-2533
 
#13 ·
Got the head on...The only problem was I couldnt use my TB 88RH piston. I used the stock head 88 piston and I honestly think it runs better than the domed. Really nice for the money. I used to have problems with jetting with my old Race Head and I didn't have to touch the jets to run with this one. I will definitely vouch for this head.