Topic: 83 CB650 Jardine Exhaust on 79 650, bad fit..

[Joewago]

So I ran across a Jardine 4-1 system on eBay that came off of an 83 650. For two hundred bucks, I gambled that if it didnt fit my 79 directly I could fudge it and make it work.

Well. It looks like its going to be a lot of fudging. The only worry I had was on port spacing, which ironically, isn't really an issue. What *is* an issue is that it contacts the oil filter cover and almost drags in the dirt. I took a bunch of photos of how it sits in a Google album: https://photos.app.goo.gl/wAed48BBkJWEdhA26 There's also video of the bike off the center stand, and I slammed the suspension to see how it would dip on hard braking or something. I'm also worried about the front fender hitting the header, but that might be normal for how these things are constructed anyway.

I could use the hydraulic press at the metalshop I used to work at, build a bending jig and all that. But I think to really shape this right I'd need to tighten the bend in the primaries just before the collector, which I'm not sure can be done safely. But maybe one of you has bent these up before, I'm sure there's a way. I'll take these to an exhaust shop or someone if I have to, I'm stoked to run this thing.

Im confident bends one and three in the drawing can be done. Its number two that Im not sure about (it looks like it could also use a shimmy to the left but that one I have no idea how to do right). Anyone done anything like this before? In my mind there's a chance that this is a routine thing in custom shops lol, there's no way that every header fits every custom applications (cars especially).

[Joewago]

I would love to add photos to this post but the forum is just really not having it today.

[Joewago]

Gotta do em one at a time I guess..

[scunny]

That's not off a 650.
Since the ports line up, if you can get some tubing to fit on the outside of the primaries, just shorten them up and sleeve the cut. I would also shorten the exhaust port ens to bring the pipes closer to the engine.
Edit. just spotted the oil filter problem. new pipe would be easier.

[jgger]

Doesn't look like it even comes close to lining up to the head, the angle is all wrong. Looks like the end needs to be lifted much higher also, probably drag on the first turn you make. A remote oil filter might make it so you could raise the end.

Just for s&j take off the filter housing and raise the back to where the mount tab is closer to the rear peg mount. That should correct the fender and ground clearance issue, then see about a filter relocation set up.

That pipe isn't even close to being for that bike. Probably better to keep looking.

[754]

Are the ports splayed or straight on the 650 ?
 That pipe looks like off an inclined motor like a 750.
 Tilt the pic till the pipes ahead of the collector is level, then the pipe starts looking normal.

[Joewago]

¯\_(ツ)_/¯

The ports on the 650 are splayed. Maaaaaaaaaaaaan. Bummer. There's gotta be a waaaayyyyy...

[Joewago]

Oh, in retrospect, you can see on one of the album photos how the head end pipes are straight and slip through the collars at funny angles... definitely not ideal lol

[dave500]

don't #$%* up just get a proper system,the effort to cut n shut?

[Nicklopic]

83 had DOHC heads, I'm not surprised it doesn't fit as the motors are different.
Anything can be made to work with enough time, money, and work but this just seems like a massive waste of time.
I would say clean it up, make it look nice and try to sell for a profit. Use your new funds and buy a proper exhaust or have one custom made somewhere if you really want to ball out

[754]

I thinkmits a 750 pipe..