Post by x94cherry on Oct 2, 2007 10:47:57 GMT -5
I can't take credit for this info, it was posted on some other boards by someone else who did an engine swap in a Jialing Passport. Really good info though, thought it might be helpful to someone:
I just completed making the switch from the 50cc engine that came on my Jialing Passport to a 90cc manual 4speed Lifan engine. I have only ridden a couple of miles, but, as can be expected, there is a huge increase in power and speed.
Here is a brief description of the process.
Step one. Remove 50cc engine. Disconnect control wires, electrical wires, and fuel lines. Remove engine mounting bolts.
Step two. Lift new engine into place and install mounting bolts. The old engine has rubber bushings on the motor mounts that compress, so, the frame has been compressed at the motor mounting holes. Not to worry the compression amounts to about the thickness of a dime, and the frame can fairly easily bent back into shape to allow the new engine to fit.
Step three. Electrical connections. The electrical plugs from the engine do not match the plugs on the wiring harness on the bike. However, the wires are color coded and the color coding does match. (This is true despite slight varriances in color. Such as a bluish green connecting to a green wire.)
Step four. Connect and install everything else.
You will need to drill new holes for the exhaust mounting bolts since the new engine is slightly longer.
Also you will need to keep the original kick starter lever to clear the exhaust pipe.
The intake manifolds are the same size, but you will want to keep the original one since it has the mounting point for the horn, the Lifan one does not.
The front sprocket for the chain will need to be replaced with one the correct size, that is one for a 480 chain, and of course you will need a new chain to make up for this change.
Some grinding may be involved in getting the clutch lever mounted depending on the lever you choose.
There are other little modifications or details that need to be made along the way but if you can keep your moped running then you are a good enough mechanic to make the changes as needed.
My speedometer cable is broken so I can not give you a figure on the speed. Also I have not opened it up all the way since I am breaking the engine in, but, there is defiantly a noticeable increase in speed. My best guess somewhere neer 50mph, with a bit of room to do a little more. (This is using a 15 tooth front sprocket.)
The 90cc is a tight fit, any larger even the 110cc versions may not fit, well at least without more modification than I am willing to do. The 125cc version is readally avalible, and if you could get it to fit the bike would really fly, literally.
I just completed making the switch from the 50cc engine that came on my Jialing Passport to a 90cc manual 4speed Lifan engine. I have only ridden a couple of miles, but, as can be expected, there is a huge increase in power and speed.
Here is a brief description of the process.
Step one. Remove 50cc engine. Disconnect control wires, electrical wires, and fuel lines. Remove engine mounting bolts.
Step two. Lift new engine into place and install mounting bolts. The old engine has rubber bushings on the motor mounts that compress, so, the frame has been compressed at the motor mounting holes. Not to worry the compression amounts to about the thickness of a dime, and the frame can fairly easily bent back into shape to allow the new engine to fit.
Step three. Electrical connections. The electrical plugs from the engine do not match the plugs on the wiring harness on the bike. However, the wires are color coded and the color coding does match. (This is true despite slight varriances in color. Such as a bluish green connecting to a green wire.)
Step four. Connect and install everything else.
You will need to drill new holes for the exhaust mounting bolts since the new engine is slightly longer.
Also you will need to keep the original kick starter lever to clear the exhaust pipe.
The intake manifolds are the same size, but you will want to keep the original one since it has the mounting point for the horn, the Lifan one does not.
The front sprocket for the chain will need to be replaced with one the correct size, that is one for a 480 chain, and of course you will need a new chain to make up for this change.
Some grinding may be involved in getting the clutch lever mounted depending on the lever you choose.
There are other little modifications or details that need to be made along the way but if you can keep your moped running then you are a good enough mechanic to make the changes as needed.
My speedometer cable is broken so I can not give you a figure on the speed. Also I have not opened it up all the way since I am breaking the engine in, but, there is defiantly a noticeable increase in speed. My best guess somewhere neer 50mph, with a bit of room to do a little more. (This is using a 15 tooth front sprocket.)
The 90cc is a tight fit, any larger even the 110cc versions may not fit, well at least without more modification than I am willing to do. The 125cc version is readally avalible, and if you could get it to fit the bike would really fly, literally.