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Here are some main tips for installing a pit bike engine into a Honda CRF50, CT70 or a similar pit bike!
1) Pegmount Fit:
To fit an aftermarket pit bike engine into a Honda 50, you need to use a spacer or an aftermarket pegmount / peg bar. Stock Honda engines have a notch that lets a stock peg bar with an 'upsweep bend' fit. Your aftermarket engine will not have this notch. 
Carb Clearence:
Pit bike engines have larger Carburators and these carbs need proper clearence.
Tank Spacers can be custom made or Purchased here to Raise up the tank. TRC CRF50/XR50 TANK SPACER KIT
A 12 way carb kit is a rotating spacer that will allow you to turn the carb for better clearence
Stock CRF50/XR50 carb cables with molded on carb caps will not fit aftermarket Pit Bike carbs
Most Pit bike engine applications will require using a POD filter (NOT the stock airbox)
Exhaust Pipe:
All Pit Bike motors with Round Cam Covers have the same Honda type ports and accept CRF50 XR50 CT70 Stock and Performance Pipes. You will need an exhaust gasket
Wiring:
Most Pit bike Engines of the Kick Start (non electric start) Type will accept Honda CRF50 XR50 ZB50 Ignitions AND / OR integrate with Stock Honda CRF50 XR50 ZB50 Ignitions and components
See out electrical section for more details
Sizing:
Most Pit bike 50-110cc engines are no larger than Honda CRF50 XR50
125-160cc engines are 15mm or .6" (less than 3/4" total) Longer at the Head
So Far ALL of our Pit bike engine Fit Honda CRF50 XR50 CT70 Z50 with just enough clearence for the front wheel in general
Our engines use the Honda bolt pattern, and bolt into Z50, XR50, CRF50, CT70, CL70, SL70, XL70, ATC70, TRX70, DAX70, TRX90, Extreme, SDG, Sikk, Pitster Pro, Coolster, Orion, Thumpstar, OGM, Pit Pro, G2Moto, Braaap and SSR pit bikes.
Clutch Cables:
Please see our Pit bike chassis parts - Controlls section for clutch cables and clutch levers
All the clutch levers we offer will work
You just need to get a Front or Rear Clutch Cable
Lifan 125 is a front clutch
All the Piranha motors are rear clutch
see pic 
CT70 Petcock:
You will need a dual feed petcock with CT70 as the new carb does not have a petcock on it
Dual Feed Petcock
ATC70 CT70 Z50
Part No: TBW0133
