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Author Topic: 1968 CL175 repair and build  (Read 16267 times)

Offline medicalmechanica

  • Posts: 104
Re: 1968 CL175 repair and build
« Reply #100 on: Jun 24, 2017, 23:03:32 »
Woah been a while. I had a surprise move and a bunch of traveling to deal with but I'm nearly done here.

Ran into one snag, though. The camshaft I bought looked right, but compared to the one I pulled out there are some differences. Pics attached are all the old cam on the top and the new one on the bottom.

The thing fits in the journals but the advance doesn't slip over the small end of the new cam. I'm tempted to just bore it out with a drill press but I'm sure someone here will save me with a decent solution.

Any ideas?
Thanks!

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Edit: The new cam has R6 cast into one side of it, not sure if that helps anyone, but if anyone knows what it is I'd like to get rid of it haha
« Last Edit: Jun 24, 2017, 23:25:59 by medicalmechanica »

Offline medicalmechanica

  • Posts: 104
Re: 1968 CL175 repair and build
« Reply #101 on: Jun 28, 2017, 19:10:13 »
Well I ordered a new camshaft and it doesn't fit the advance plate either, so now I wondering if maybe I had the wrong cam to begin with, or if it's possible that the 68 cam is somehow different from the later models. Anyone got any insight on that?

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Offline medicalmechanica

  • Posts: 104
Re: 1968 CL175 repair and build
« Reply #102 on: Jul 05, 2017, 02:59:52 »
Progress! I got a new advancer and it fits the cam I bought. It looks like this bike had maybe the wrong cam in it when I got it. My understanding is that the 306, 307 etc casted advancer belongs in the 175s and the one I had said CB93 on it so I dunno.

Anyway, just have to sinch everything up and find a tiny bolt to hold the points plate down and we'll be good to go!

Scissor jack from my 88 Supra ftw.
 

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Offline teazer

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Re: 1968 CL175 repair and build
« Reply #103 on: Jul 05, 2017, 16:17:22 »
Just got back into town after a week without much internet.  Early cams - 160 and sloper 175 had a smaller diameter points cam.  Later ones were 1mm larger. 11mm vs 10mm I think.

CB93 was the 125 version of the CB160 and that's what the points assembly were on slopers of all sizes - 125, 160 and 175. Later Honda changed to use the model code 268, 259, 312 or whatever and they use that code in the part number.

You can also use a rev counter on that slotted later cam. You will need the whole cam tower assembly with gears, cable and a suitable tacho.

Offline medicalmechanica

  • Posts: 104
Re: 1968 CL175 repair and build
« Reply #104 on: Jul 05, 2017, 16:20:46 »
Just got back into town after a week without much internet.  Early cams - 160 and sloper 175 had a smaller diameter points cam.  Later ones were 1mm larger. 11mm vs 10mm I think.

CB93 was the 125 version of the CB160 and that's what the points assembly were on slopers of all sizes - 125, 160 and 175. Later Honda changed to use the model code 268, 259, 312 or whatever and they use that code in the part number.

You can also use a rev counter on that slotted later cam. You will need the whole cam tower assembly with gears, cable and a suitable tacho.
I'd need the new tower, gears and cable for a tach, but it should work at least to get it running again right? I've got it all back together and it seems to fit just fine so I gonna grab some hardware tonight and see if I can get it started.

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Offline medicalmechanica

  • Posts: 104
Re: 1968 CL175 repair and build
« Reply #105 on: Jul 05, 2017, 23:48:07 »
Well, oiled and gassed up and I kicked my guts out but no start. I've got spark from both plugs, checked and double checked the points, played with the choke, and nada.

I tried to do the old finger in the hole compression test and didn't really feel anything, maybe somehow I messed up the rings. I'm also a little worried that my cam is a tooth off or something because it's firing enough for a warm pipe but it won't run.

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Offline medicalmechanica

  • Posts: 104
Re: 1968 CL175 repair and build
« Reply #106 on: Jul 06, 2017, 14:22:28 »
Now that I think about it, it'd make more sense that I put the cam in wrong and the valves are open on the compression stroke or something. Guess I'll tear back in there and redo that and the points.

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Offline teazer

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Re: 1968 CL175 repair and build
« Reply #107 on: Jul 06, 2017, 14:45:55 »
Before you tear it all apart, did you check that spark happens at the T position? Are the carbs getting fuel and are the jets etc all clean?

At TDC, what is the position of the points cam?

Offline medicalmechanica

  • Posts: 104
Re: 1968 CL175 repair and build
« Reply #108 on: Jul 06, 2017, 14:51:24 »
The spark happens at the right spot for sure, checked that twice. The carbs are clean because I cleaned them when I removed them, and I'm getting a gas smell on the plugs. Since I'm not feeling any compression on the plug hole when rotating I'm assuming the valves are not closed on the compression stroke. I installed the cam with the O at the top but I don't remember checking what stroke I was on and I bet I messed that up haha.

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Offline medicalmechanica

  • Posts: 104
Re: 1968 CL175 repair and build
« Reply #109 on: Jul 06, 2017, 14:52:43 »
Oh, also I'm getting that kinda bung noise when kicking on every 3rd rotation or so, which is indicative of timing, and since my spark is happening on time that'd point at the cam too right?

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