125cc Engine Swap - question about Rectifier and Ignition

[Rutherford]

I bought the Lifan 125cc engine off of ebay. Now that I am ready to install it I see a few differences that I don't know how to deal with.

The first issue I see is that there is a silver (rectifier - is that right?) with a 4-pin socket. What does that hook up to?

Second, there is a black thing with a 6pin socket. My bike had one of these and I replaced it with the new one. It was connected to the wiring harness on the bike.

Third, the engine has 6pin harness with 5 wires pinned out. Three of these wires match colors existing on the bike.
Does this harness go to the black device or the harness on the bike?

The auction says it includes these 3 items: Engine Voltage Regulator
Starter Relay
Rectifier
Also, why would they include a starter relay?

I would like to get this running but I am stuck - any help would be appreciated!!

Thanks,
Rutherford

 

[Rutherford]

The ebay seller sent me a link to a wiring diagram. My new engine is the '5 wire system'. I will have to take a look later tonight to see if this matches.

 

[Jasle]

can you post the link? this is good info that might help a lot of people.