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Trail Bikes 88cc Big Bore Kit + Race Head V2 + Mikuni VM26 Carb Kit (12 volt) - Z50 / XR50 / CRF50 / XR70 / CRF70

Roller Rocker Race Head V2 88cc Big Bore Kit
Z50 / XR50 / CRF50 / XR70 / CRF70
Pricing: $753.95
5 5 1


Roller Rocker Race Head V2 88cc with Mikuni VM26 Carb Kit

Z50 / XR50 / CRF50 / XR70 / CRF70 and other pit-bikes with Mikuni VM26 Carburetor


     - Roller Rocker Arms
     - 28.5mm intake Valve with 5mm Valve Stem
     - 23.5mm Exhaust Valve with 5mm Valve Stem
     - 23mm Exhaust port
     - Matching High Compression Piston
     - Head kits include all hardware
     - 52mm piston with rings, pin, & clips.
     - 52mm Aluminum Cylinder
     - High performance race camshaft (for the Race Head only)
     - Head gasket kit.
     - Mikuni VM26 Carb kit

Recommended Improvements:

     - 26mm Intake port FF0433TB
     - Clutch tool TBW1013
     - High volume oil pump (Either)-12 volt (FF0226TB) or 6 volt for 81' or earlier models us (FF0225TB) -
     - Oil cooler kit FF9073TB

Please Note:

It will save lots of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal).
Race fuel not need but would work best.. At a minimum we recommend using premium fuel

If you have any questions please call one of our knowledgeable and friendly techs at 833-327-8507

Parts Included:

-V2 Race head 0750
-V2 Head bolt kit 0755
-Camshaft V2 0752
-V2 Head Cover Set 0754
-Piston 0753
-Gasket Set 0859
-Cylinder 0156
-Throttle Cable 0301
-Intake Kit 0433
-VM26 Carburetor 0399
-Air Filter 0413


  • K9115TB
  • K9115TB
  • Trail Bikes
  • New


Shipping Information

  • Item Requires Shipping
  • 8.0 lbs.

Customer Reviews

Comment Total Reviews (1)

  • Currently 5/5 Stars

Reviewed by:

Product ownership: A year or longer

Purchased from: Fast50s

It was a night and day difference after I installed this on my 1994 Z50R kart track race bike. For a 88cc bike this thing screams! Only issue I had is I didn't like the VM26 carb. I ended up buying the 20mm carb kit Fast50's sells, and it fixed any of the issues I was having with bogging. This is a tremendous power upgrades! Revs to the moon and back!

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