Author Topic: 1971 CB350 build  (Read 1836 times)

Offline cb360j

  • Posts: 368
Re: 1971 CB350 build
« Reply #10 on: Dec 04, 2018, 11:54:02 »
I do not know how technical this is but.. From experience when you are able to rock the bike back and forth it helps the gears change. Having a a chain on would allow the gears to rotate inside the transmission

Offline Sonreir

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Re: 1971 CB350 build
« Reply #11 on: Dec 04, 2018, 12:14:18 »
And I have a larger concern.  It doesn't shift out of first, as best that I can tell.  It seems to find neutral, and solidly clicks down to first, but won't shift into the upper gears.  I've been told that a chain will fix this, but I find that hard to believe.   It would really suck to have to pull that engine apart again.

These bikes won't change gears (at least not easily) unless either the back wheel (with chain) or engine is turning.
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Offline Knoxes

  • Posts: 18
Re: 1971 CB350 build
« Reply #12 on: Dec 04, 2018, 12:53:08 »
Well, ok.  Confirmed. 

The source of the original info was a guy that should know, but also a guy that I don't know well.  And he's likely to get some work out of me before this project is done.  So it's good to know that he's been validated.
1971 CB350 K3

Offline imwastefull

  • Posts: 88
Re: 1971 CB350 build
« Reply #13 on: Dec 04, 2018, 15:04:26 »
As your shifting up into 2nd, grab the sprocket and give it a turn, it'll shift up. the transmission likes tension on the gears to click.

Offline Knoxes

  • Posts: 18
Re: 1971 CB350 build
« Reply #14 on: Jan 02, 2019, 13:01:33 »
So I sent the tank out to have it chem dipped and then to a dent wizard.   I rattle-canned some primer on it just to hold over until I send everything out for paint (which could be months from now).   Over the holidays, I had hoped to get close to trying to start it, but ran into a problem.  Something wasn't right when I went to set the valve lash and decided that I needed to pull the engine and check the cam timing.   It's been 2.5 years since I rebuilt the engine and I couldn't remember the process. 

This turned into quite a project.  I tried multiple times to get the cam sprocket lined up with the LT mark on the stator, but eventually settled with this:

Just one chain link in the other direction ends up with this:

The top pic is retarded and the bottom appears to be advanced.  And the top pic seems to be closer to level with the top of the cam case, so I'm going with that.

Unfortunately, I now have to replace all of those gaskets, so all progress is halted again while I wait for parts...

Oh, the tank can be seen hanging in the background.  Stupid - I shot it with the wrong filter on my mask and then sat in that confined space for another couple of hours.  A week later and my sinuses are still a mess.
1971 CB350 K3

Offline Knoxes

  • Posts: 18
Re: 1971 CB350 build
« Reply #15 on: Jan 22, 2019, 11:04:15 »
Everything is back in now except for the exhaust.  It has power and oil, but no gas yet.  I'm trying to work out the electrical, but this is really the weakest point in my already weak skill set. I have a reproduction stock harness, a Sparckmoto retifier/regulator and a stock starter relay.  The wires from the harness don't color match the starter relay so I just plugged them in according to the connector type.  And the new key switch only powers everything in the accessory position.  I already blew the main fuse - not even sure how I did that.   I'm just trying to see if I can get the starter to turn the engine over. 
1971 CB350 K3

Offline Knoxes

  • Posts: 18
Re: 1971 CB350 build
« Reply #16 on: Jan 28, 2019, 14:45:29 »
I've discovered that the starter was "bad".  I don't even know what that really means other than it won't spin.  I *should* know, because I rebuilt it two years ago, but I don't.   

So I've pulled the parts bike starter and broke it down.  I'm pretty sure I have a whole other rebuild kit because I vaguely recall buying 2 for some reason. I've read plenty about the rebuild process and I can follow directions.  But I probably thought that was true when I rebuilt the other starter too.  Wish I knew why the other one wouldn't spin.  Nothing in the gearing seem bound or locked up.
1971 CB350 K3

Offline Knoxes

  • Posts: 18
Re: 1971 CB350 build
« Reply #17 on: Feb 04, 2019, 10:17:41 »
I still don't know why it wouldn't spin, but after assembling, disassembling, re-assembling (repeat 2x), I finally got one to spin freely.  I think something in the windings was interfering with the armature.   It's back in the engine and the engine is turning over (no fuel yet).   That's a huge step forward.  Now I just need to fuel it, time it and install the exhaust and it should be ready for a test fire.
1971 CB350 K3

Offline Knoxes

  • Posts: 18
Re: 1971 CB350 build
« Reply #18 on: Aug 26, 2019, 12:09:01 »
Since I started this thread, I suppose I should update it.  I've been working on the bike pretty regularly.   Since February, I sent the starter out to get it's demon excised.   Got the engine totally reassembled and back in the frame.  And after a lot of fiddling, I got it running!  I think that was in March(ish).  It ran great and I even dared to take it out for a little ride up and down our little backwoods road.

I thought this would be a good time to build the cowling, so I tried using Great Stuff:

It sorta worked, but not ideal:

So I sent the seat pan out with the tank to the paint shop.  It's still there (3 months later). So it was time to tear it all back down for final(?) build:

Had the frame powdercoated:

And started to reassemble:

Lots of new parts:

And I'm in the re-wiring stage so I built a battery tray and I'm working out the logistics.  Wiring is not my strong suit:

« Last Edit: Aug 26, 2019, 12:25:09 by Knoxes »
1971 CB350 K3