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1  General Category / Tech Corner / Re: California emmisions on: April 18, 2022, 09:39:01 AM
The California emissions system is detailed starting on page 1-25 of the Honda service manual. Basically the system included a charcoal canister to absorb fuel vapors from the tank vent and carburetor vents plus associated tubing and valves that control purging the canister. The second part is the secondary air supply system, which introduces filtered air into the exhaust ports to burn unburned hydrocarbons. Neither system affects performance, but can cause problems if any of the many rubber tubes develop leaks. There is also a small amount of weight to be saved by removing all components and blocking off all disconnected ports.


I just recently acquired a 1990 cb-1, and I noticed it was a California vehicle with the emmisions system. I'm just curious because I can't seem to find any information on the system. Does anyone have any information on removing it? Is it worth taking off the bike?
2  General Category / Tech Corner / Re: Leaking carbs on: April 18, 2022, 09:20:21 AM
Clean everything up and pinpoint where the leaks are from. You don't mention replacing the fuel fittings and O-rings parts #2 and #3 in this diagram:

Those are most likely the problem. By "float seals" do you mean the float bowl gaskets and float bowl drain screw O-rings? Those need to be new. Also if the float bowls are switched between carbs they will not seat against the carb bodies, due to a small raised boss near the mixture screw on each carb body.


Stood for 4 years.
New float valves and seats, yep.
New pilot screw O-rings, yep (had to use dentist picks to remove old ones).
New float seals, yep.
Float heights set (8mm) yep.
Fuel still dripping heavily from all four carbs.
Any suggestions people?
3  General Category / General Motorcycle Discussion / Re: friggin facebook on: February 24, 2022, 12:04:47 PM
I agree with you Stussells, I frequented the Vintage Japanese Motorcycle Owners Group often, and it is no more. The Facebook group VJMC is very disjointed in comparison. Without fixed categories and good search functions the same questions get asked and answered over and over.

Having said that I am guilty of ignoring this forum for the past year or so, although that has mostly been due to dealing with a wife with dementia.

4  General Category / Tech Corner / Re: Carbs are working well??? on: February 24, 2022, 11:53:55 AM
As morti says the slides will not open all the way unless the bike is under load. Running the engine in neutral it will rev to redline but there will without load there will not be enough vacuum to raise the slides. And if they did raise all the way under those conditions the engine would stall. That's the beauty of CV carbs, the slides only open enough to maintain "constant velocity" (optimum velocity) of the air flowing through them.

5  General Category / Photo Gallery / Re: Photos on: August 01, 2020, 10:07:19 PM
Just upload photos to a photo hosting site like Smugmug, then copy the photo URL and past it in between the codes. It doesn't look like there is a way to directly upload photos to this site.

6  General Category / Tech Corner / Re: Installing a Facet solid state electronic fuel pump on: July 29, 2020, 10:23:37 PM
nice to see this documented.  makes me wish i wouldve waited but i bought a nos pump from a seller in isreal a while back. 

Lucky find, that NOS pump should be all you ever need.

7  General Category / Tech Corner / Installing a Facet solid state electronic fuel pump on: July 26, 2020, 12:14:30 PM
After reading stories about fuel pump fires likely caused by arcing of the pump's mechanical contact points, and knowing my pump was 31 years old and no longer available I decided to upgrade to something that is easily available and reliable. I had previously replaced the contact points in my OEM pump as a precaution, but I thought it better to replace the old pump which was likely to fail someday from old age. So after a bit of internet reading I discovered that a popular upgrade for the old mechanical contact diaphragm pumps is the Facet 40171 electronic fuel pump. These use solid state switching instead of mechanical points and are a popular retrofit on many bikes, especially the KTM 950. They are also popular with small kit aircraft builders so I figured that speaks to their reliability. I bought mine from Aircraft Spruce & Specialty Co. in S. California.

The Facet installed fairly easily and works very well. For comparison here is the original pump and filter arrangement:

This is the Facet 40171. It has female 1/8 pipe threads for the inlet and outlet, so I added a 3/8" barbed fitting to the inlet to match the 10 mm fuel filter nipple and a 5/16" barb to the outlet to match the 8 mm fuel line to the carbs.

I then sawed off part of each mounting bracket and drilled a hole on the remaining tab for zip ties.

I added 5 mm thick self adhesive foam to the inside of the original pump frame bracket. The Facet was then a snug fit in the U of the bracket. I bent the mounting tabs downward and used zip ties down to the original bracket. Here is a top view -

and the side view-

I needed a single U-bend 10 mm hose to go between the filter and the pump. This universal molded fuel line had the section I needed:

Finding room for the filter was tricky. I trimmed the lower left corner of the battery box to better clear the hose but that is not strictly necessary.

Here is the completed installation. I had to reverse the fuel filter and put the larger end w/metal ring as the inlet in order to fit. A smaller filter would make things easier but this works fine. The filter is zip tied to the frame and rests on rubber foam on top of the pump. From the petcock the fuel line makes a short straight run to the filter, then a U bend connects to the pump. The pump outlet aligns perfectly with the original carb supply line. The pump has built in shutoff and anti-siphon valves to prevent fuel flow when turned off. Flow is way more than adequate and pressure is 2-3.5 psi so there is no problem overpowering the float valves. After all, this pump is specifically designed for carbureted engines.

8  General Category / Tech Corner / Re: Wiring issue for heated grips on: January 22, 2020, 11:24:50 AM
All battery circuits are the same voltage, 12V. It is always best to run a separate wire (of the correct guage) directly from the battery for accessories like heated grips, and that wire should have it's own fuse located close to the battery. Connecting heated grips to a lighting circuit risks overloading the lighting fuse. Also voltage to the grips will be less due to voltage drop caused by the lighting load.

9  General Category / General Motorcycle Discussion / Re: What other fork tubes/legs ? Would fit my CB1 on: September 25, 2019, 08:48:50 PM
Lots of possibilities, new seals damaged during installation? Seals installed upside down? Fork tubes worn or scored? (they should look perfectly smooth with no scratch or wear marks).

10  General Category / General Motorcycle Discussion / Re: CB-1 crash bars on: September 25, 2019, 10:30:04 AM
The only downside is they may be a bit in the way for riders with big feet. Downshifting I even contact the left side bar with my little 8-1/2's occasionally.

11  General Category / General Motorcycle Discussion / Re: Suggestions for a new CB-1 owner on: September 01, 2019, 12:20:32 PM
I have to agree with a_morti re: Jokey Smurf, why the snarky attitude all the time? The guy just bought a CB-1, the bike we are here to celebrate, not tear down.

And welcome .regal. As a_morti said, you're going to have to fix that oil leak, otherwise it might dump oil on your rear tire after a hard run. But first have you confirmed the leak is really coming from the C/S seal? Clean the area thoroughly with solvent, then run the bike a short time and inspect. If you are very lucky the oil might be from the shift spindle seal or oil pressure sender, both of which are simple fixes. Good luck!

12  General Category / Tech Corner / Re: Not Running - HELP Please. Suspect fuel issue? on: August 16, 2019, 12:59:23 PM
I think you're right that it sounds like a fuel problem, so I would check that fuel level is high enough that the petcock does not need to be on Reserve or that the nylon filter screen inside the tank is not clogged. Do those by pulling the fuel line off the petcock, adding a spare piece of fuel line into a container then opening the petcock to ON and Reserve watching for good flow. If flow is very slow, open the tank cap to eliminate the possibility of a clogged air vent.

There are also individual small filter screens attached to the float valve seats, so if the above tests check out try opening the float bowl drain screws 1 turn one at a time (with a catch can under each drain spigot) and watch for continuous flow. NOTE: The fuel pump is not needed if the tank level is 1/2 or higher, so this test can be done with the key off/full tank. If your fuel pump were to be bad and tank level was very low you would get fuel starvation. Of course you can test the pump by putting a spare hose and catch can on the pump outlet and cranking the engine.

The strange symptom is the fuel leakage out of the carb vents. I can't think why that would happen. Let us know what you fine, and good luck.

13  General Category / General Motorcycle Discussion / Re: CB-1 crash bars on: August 12, 2019, 08:18:27 PM
Those actually look pretty good and will protect those impossible-to-find cases if you do fall over.  As a big plus, you could fit some small folding highway pegs that would allow you to stretch your legs a bit on a long ride.


Thanks Eric, yeah that's what I'm thinking. I've already done one Laurel and Hardy tip-over at a friend's house, where my 70 yr. old legs could not save it. Of course I was showing off and gassed it up. Spun out and fell at low speed but luckily it was on dirt/grass.

14  General Category / General Motorcycle Discussion / CB-1 crash bars on: August 12, 2019, 05:48:03 PM
In case anyone is looking for a set of crash bars, I've just installed a set from in Ukraine (link Fit and quality are excellent, and shipping took just a couple of weeks. I had previously bought a set for my NX250 and the quality was equally good. I know they look kind of stupid, but the way those engine cases stick out I'll suffer the dork look to get the case protection!

15  General Category / Tech Corner / Re: Changing the handlebars. What do i need to buy? on: August 11, 2019, 09:29:07 AM
Nice jog KiwiKK, my bike had Hawk bars installed when I bought it. They are about 1" taller and about 1" further back than stock. The setup feels good to my 70 year old back, but I might swap back to stock some day just to feel the difference.

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