NOTE:  This kit Fits bikes with 32mm Steel seat post.

RIGHT SIDE Multi-Speed Shift Kit for  bikes with 3" min. seat post to tire clearance.  

To see what you get in this kit view the Bill OF MATERIALS Picture!   

• NOTE:  BIG PLUS!  The rear bike wheel need not be removed to fit this multi-speed jackshaft drive as would be required with single speed left side drive.    

Using this Multi-Speed Shift Kit is just like shifting a motorcycle.   

Top speed depends on your rear-wheel-drive ratios and engine performance.   

If you are an engineer, you can calculate speed by using engine rpm, your multi sprocket ratios to determine final drive ratios via wheel circumference and a mile a minute constant.  

BASIC OPERATION:  The engine drives the jackshaft left side 17T sprocket. 

The right-side Jackshaft sprocket drives a bottom bracket freewheel pedal sprocket.  An additional inboard chain sprocket drives the bike's Multi-Speed rear wheel.   See picture.    

NOTE: With any Multi-Speed set up it is difficult to pedal start a 2-stroke engine.   Therefore, consider buying a SkyHawk Gt5A engine or a Skyhawk Avenger 85 that has OCDT cranking ability.    OCDT = Overrunning Clutch Drive Tool.

Salient Feature: This kit allows mounting a 2-stroke Bike engine in center-line Mid-Frame. 

THEREFORE, THE ENGINE IS NOT Offset, it sets in the middle of frame where it belongs.  

Got a steel frame bike with 28mm dia. steel seat post?    No problem just order  our Jackshaft kit made for a steel frame. 

WARNING:    Jackshaft 2 pcs. Bracket must have 3" minimum clearance from behind the seat post to the rear tire.    

• FYI:  We only made 50 of these CNC SEATPOST Multi-Speed JACKSHAFT KITS to test the multi-speed shift kit market. 

• NOTE: Installation is not for a faint-hearted or mechanically challenged person.  Mechanical aptitude and small engine experience is necessary.  Sorry, We had no time to film an instruction video.  If someone wants to make one we will gladly post it with your name recognition for others to see.

• Especially designed for bikes that have 3" minimum clearance between seat post and tire.  

• To avoid a return for non-fit please ask questions and measure your bike before buying to avoid a 25% restocking charge. 

• By using our jackshaft bracket your 2-stroke engine remains in a middle frame position same as would be in a standard left side drive single speed bike application thus giving best balance and professional look.   Problem solved!

• Up until now the only way to fit an engine on a 4" tire bike was to offset the engine to the left.  Problem Solved! 

• Heads up!  Up until now the only way to move the engine forward for attachment to a Cruiser bike S downtube was to use (2) rear engine blocks.  Included in this kit is a SOLID billet CNC cut spacer block and 2 long M8 studs.  PROBLEM SOLVED

• OPERATION:  The Multi-Speed Seat Post Jackshaft Bracket allows the engine to drive a left side 17T sprocket and on the right side is your choice of a 9T or 10T sprocket driving a chain going to a bottom bracket sprocket with freewheel driving back to the multi-speed rear bike wheel.  Problem solved! 

• The problem of how to tighten the engine chain is solved by using our non-concentric Cam Lock Hub, same idea as used in our 4G 4 cycle transmission.  Problem solved!

• Customer must make their own DIY sheet metal right side chain guard and obtain the required 415 drive chains.   ( Therefore, Chains and chain guard are Not Included. )   

• NOTE:  BIG PLUS!  The rear bike wheel need NOT be removed to fit our jackshaft multi-speed shift kit.   

• How fast can you go with Multi-Speed shift kit?  That depends on your 9T or 10T jackshaft drive sprocket selection and rear wheel drive teeth ratios, head winds and weight of rider with terrain conditions, and aftermarket engine modifications.     We supply basic parts for the builder to design his own creative results.  Give it a try and get famous on "Facebook" motorized bike forms.