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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - '73 CL100 fix-up


'73 CL100 fix-up
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ConnerVT
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Joined: Jun 01, 2012
Posts: 184
Location: North of Albany, NY, USA

PostPosted: Fri Sep 08, 2017 9:16 am    Post subject: Reply with quote

2.5x18 NR53 at Dennis Kirk - $20 +18 shipping to Ohio

https://www.denniskirk.com/irc/nr53-tire.pfp542924.prdf
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dgjessing
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Joined: Aug 11, 2017
Posts: 63
Location: Columbus, OH

PostPosted: Fri Sep 08, 2017 1:38 pm    Post subject: Reply with quote

ConnerVT wrote:
2.5x18 NR53 at Dennis Kirk - $20 +18 shipping to Ohio

https://www.denniskirk.com/irc/nr53-tire.pfp542924.prdf


Fantastic - thanks. That's the same as the existing front tire, so they will match Smile
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dgjessing
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PostPosted: Fri Sep 08, 2017 4:00 pm    Post subject: Reply with quote

Well, I couldn't be more pleased - the new carb did the trick! Runs like a sewing machine through all five gears Smile. I only went around a couple blocks 'cause the brake light isn't working yet (and it's taken a few beers to do this stuff Rolling Eyes), but I'm pretty sure it's going to be fine. Starts first kick, nice slow idle, good throttle response & what seems like plenty of power.

Happy camper here Very Happy
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spurlock
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Joined: Jul 08, 2014
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Location: Vacaville, CA

PostPosted: Fri Sep 08, 2017 4:15 pm    Post subject: Reply with quote

dgjessing wrote:
Well, I couldn't be more pleased - the new carb did the trick! Runs like a sewing machine through all five gears Smile. I only went around a couple blocks 'cause the brake light isn't working yet (and it's taken a few beers to do this stuff Rolling Eyes), but I'm pretty sure it's going to be fine. Starts first kick, nice slow idle, good throttle response & what seems like plenty of power.

Happy camper here Very Happy


Fantastic, good on you for getting another classic bike back on the road to good health!

-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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dgjessing
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PostPosted: Fri Sep 08, 2017 4:21 pm    Post subject: Reply with quote

Thanks! Progress pics:


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dgjessing
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PostPosted: Fri Sep 08, 2017 4:30 pm    Post subject: Reply with quote

Some previous owner took most of the foam out of the seat, so it's horribly uncomfortable; that needs to be fixed. I need side covers, and the correct tail light and handle bars. The rear brake didn't work very well on my short ride. It's missing the front brake light switch, and the rear brake light switch doesn't work. And turn signals. Oh, and the low beam headlight doesn't work. Besides general cleaning & painting, that's all I see at this point. Very Happy
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dgjessing
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PostPosted: Sat Sep 09, 2017 9:57 am    Post subject: Reply with quote

Just rode a round a little to warm it up, then drained the oil - pretty yucky looking stuff. Also, the filter screen was installed backward (out in the cap) so it was doing nothing at all. I wonder if there are after-market real filters available to replace the screen?
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spurlock
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PostPosted: Sat Sep 09, 2017 11:40 am    Post subject: Reply with quote

dgjessing wrote:
Just rode a round a little to warm it up, then drained the oil - pretty yucky looking stuff. Also, the filter screen was installed backward (out in the cap) so it was doing nothing at all. I wonder if there are after-market real filters available to replace the screen?


Yikes, that backwards screen is not good. That means larger particles could have gotten sucked into the oil pump and beyond. From the pump, some of the oil runs through the centrifugal filter and into the crankshaft to lubricate the connecting rod big end and spray out on the cylinder. But the rest of the oil feeds through a metering orifice at the base of the right rear cylinder stud and on up to the camshaft. Larger particles could plug that orifice, starving oil to the cam and cam bearings, aka cylinder head. So I'd suggest pulling the right crankcase cover, cleaning out the centrifugal filter and inspecting the orifice to make sure it is clear. I can't find any pictures of exactly what the orifice looks like. Also pull the oil pump apart and check for excessive scoring of the rotors and pump body which can reduce pump output.

I don't know of any substitute filter for the screen. All the oil does eventually pass through the centrifugal filter which is actually very effective. A magnetic drain plug never hurts either. Good luck,

-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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spurlock
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PostPosted: Sat Sep 09, 2017 12:00 pm    Post subject: Reply with quote

OK, this picture shows the orifice that meters oil to the cam and head. You will need a small wire bent at a right angle to probe it from the side once the clutch cover is off.



The oil feeding the cam orifice also supplies another orifice that feeds the transmission, so be sure to probe it as well. Here is a picture of it taken from inside the crankcase. It will look the same when viewed from the outside.



-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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dgjessing
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PostPosted: Sat Sep 09, 2017 12:33 pm    Post subject: Reply with quote

The rocker arms are obviously getting oiled (based on visual inspection) so I don't think anything drastic happened, oil-delivery-wise. Knock on wood Rolling Eyes

I've put about twenty miles on it today without getting too far from home. Charging system seems to be working as the battery voltage is staying steady even though I'm riding with the high beam on. I will do the actual test you outlined earlier soon, but it seems OK.

I haven't exceeded about 40 mph yet - waiting to get rid of the ancient rear tire before opening it up Very Happy

It took twenty kicks or so to start it cold this morning but since then it's started first kick 5 or 6 times. I haven't got the cold start routine down yet (obviously).

The speedometer works, and seems to be pretty accurate. Both brakes are working better than yesterday - I've scrubbed the rust off I suppose. I will of course inspect them when I change the tires around next week.
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dgjessing
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PostPosted: Sun Sep 10, 2017 2:03 pm    Post subject: Reply with quote

Well I like it when stuff like this happens: An intermittent grinding/rumbling sound turned out to be the chain rubbing on the center stand. I'm guessing there is supposed to be a rubber bumper to hold the stand down a bit, but a simple nut & bolt has done the trick. A lot smoother & quieter now Smile. Deep groove worn in the leg of the stand would indicate that it's been like this for a long while.


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dgjessing
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PostPosted: Mon Sep 11, 2017 2:23 pm    Post subject: Reply with quote

I set off on a little ride this morning and since the chain wasn't rubbing on the stand anymore I could hear that the over-size front tire was rubbing on the fender! So I decided to park it until I've sorted out the tires (new one supposed to be here tomorrow). Instead I went to the junk yard and found what I believe to be the correct turn signals. I'm in the process of cleaning them up and installing them - hopefully the wiring for them is OK, but it will be a while to find out as I had to order bulbs on-line.


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dgjessing
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PostPosted: Mon Sep 11, 2017 4:43 pm    Post subject: Reply with quote

Pretty much certain the turn signals are correct, as the front and back are the same distance apart (different length stems).


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spurlock
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PostPosted: Mon Sep 11, 2017 4:50 pm    Post subject: Reply with quote

dgjessing wrote:
Pretty much certain the turn signals are correct, as the front and back are the same distance apart (different length stems).


Hmmm, not sure about that. On my '75 CB125 the fronts are about 17" apart center to center and the rears are 12-1/2". Your rear signals look unusually far apart, or maybe it is a wide angle lens making them look that way.

-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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spurlock
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Location: Vacaville, CA

PostPosted: Mon Sep 11, 2017 4:53 pm    Post subject: Reply with quote

This photo seems to confirm that the rears should be closer together than the fronts.



-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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