1972 ct90 Lifan swap

Tuuubbs

New Member
Ordered a clutch cable, a new front brake cable, and a new exhaust yesterday. Will have to take the exhaust to a shop to have custom fit since the original one doesn’t line up.

My handlebars have some play where the quick release has worn the teeth down that lock the bars in place. Think a layer of gasket paper will fix it?
 

Tuuubbs

New Member
Clutch cable came in through Amazon. There’s no way this thing is going to work. Anyone have a clutch cable they can recommend?
 

Tuuubbs

New Member
What’s up with the shape of the exhaust port on the Lifan motor? How can I make these parts fit? I went to a muffler shop today and the guy said someone might make a brass fitting to cover the hole and allow the exhaust to be flush.
 

Attachments

  • 3C6ADDA2-ED7F-4F61-88DC-28831E51E6A8.jpeg
    3C6ADDA2-ED7F-4F61-88DC-28831E51E6A8.jpeg
    806.8 KB · Views: 13

WarnerSteel

Active Member
What’s up with the shape of the exhaust port on the Lifan motor? How can I make these parts fit? I went to a muffler shop today and the guy said someone might make a brass fitting to cover the hole and allow the exhaust to be flush.

Does your exhaust fit into the hole? Do you have the two “half” collars that hold it into place?

If the lip of the exhaust fits into the exhaust port, there are collars that sandwich the pipe and fit between the lip and the mounting flange that is loose on the pipe.
 

Tuuubbs

New Member
Does your exhaust fit into the hole? Do you have the two “half” collars that hold it into place?

If the lip of the exhaust fits into the exhaust port, there are collars that sandwich the pipe and fit between the lip and the mounting flange that is loose on the pipe.
It doesn’t fit into the hole, it’s too wide and the bell shape stops where the bolts come out, don’t know about the half collar pieces, exhaust only came with the loose piece on the pipe
 

Old Guy Too Many Bikes

Well-Known Member
You can grind some metal off the lip until it fits in the hole. Make sure you use a fresh crush gasket. If the nuts on the studs bottom out before the exhaust seats on the gasket, you'll need some kind of spacer (like the two half collar pieces). Also be aware, that the muffler probably won't bolt up to the original mounts. You may have to fabricate a piece of bar stock and attach it to the shock mount. You may also have to play with the angle to make the seating on the gasket flush. Remove that ugly rusty heat shield to make it easier to work with. But since you said you ordered a new exhaust, none of this is really necessary.
 

kirrbby

Well-Known Member
You need the exhaust spacers...parts #1 in the CT70 fiche. pipe end goes in...then the spacers...then the flange goes onto the studs and presses the pipe end tight into the crush washer and head...making a tight seal.


1653274401470.png
 

Tuuubbs

New Member
Well it took me 4 and a half hours of filing, but I got the new stock replica pipe filed small enough to fit the port on the motor. The mechanic at my shop at work gave me a Mill Bastard and said have fun. I didn’t.

I have an extension and crush gasket on the way from eBay, clutch cable should be in tomorrow. Might take her out for a loud spin around the block tomorrow afternoon if it does arrive tomorrow.

After those things all o have left to do is change the tires and connect the engine’s electrics to the bike.
 

Attachments

  • image.jpg
    image.jpg
    2.5 MB · Views: 7

Tuuubbs

New Member
Anyone know if there’s a 2 piece 30mm flange I can replace the original one with, or will I need to have the pipe cut, a new one put on, and the lip welded back on? I can cut the one that’s on the pipe off no problem, I just won’t be able to file it down enough to get the bolts through and have room to tighten nuts.
 

Tuuubbs

New Member
Also I tried to tape the exhaust spacers to the header pipe to see how it lines up and to make sure the collar can bolt down, it can’t. Will I have to cut them in half to allow the bolts to go further through the collar?
 
Top