Click on image to zoom

*AHP 4 Speed Transmission (1 Down 3 Up) - Z50 / XR50 / CRF50 / XR70 / CRF70 / CT70 / SL70

Z50 / XR50 / CRF50 / XR50 / CRF70 / CT70
Pricing: $164.95


AHP 4-Speed Transmission Kit

The AHP 4-Speed transmission shift pattern is 1 down, 3 up with hardened gears and shift forks
The kit is made for those of you wanting to upgrade your stock Honda motors from 3-Speed to 4-Speed
It will work with both stock style, semi-auto AND manual clutch kits
(fits into your OEM Honda cases or your import motor with crank mounted clutch)

Recommended for engine builds starting anywhere from 50cc all the way up to 117cc plus

Fits in:

Kit comes complete (ready to pop in) with:
     -Main shaft and gears
     -Counter shaft and gears
     -15 tooth front large spline Z50 style sprocket
     -Shift drum and hardened shift forks

Arrives assembled for you!

Primary reduction ratio: 3.722

Gear Ratios:
     -AHP     -OEM Honda
     -1 - 3.182     -1 - 3.272
     -2 - 1.706     -2 - 1.706
     -3 - 1.238     -3 - 1.238
     -4 - 0.917     -4 - You wish, that why you're buying THIS! :)

Quick note: 50 Primary gear count 17/69 or 70 18/67

For reference:
     -Check out the video on YouTube of splitting cases:

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


  • AHP-ENG38
  • AHP-ENG38
  • AHP
  • New


Shipping Information

  • Item Requires Shipping
  • 7.0 lbs.
  • W8.0000” x H4.0000” x L4.0000”

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.

  • FAST ShippingWe ship out items quickly! International Shipping available
  • Safe & Secure Worry-free Online Shopping
  • Online e-tailerWe've been in business since 1999
  • Largest Mini Bike Parts SelectionBest Quality Made Parts Available