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1  General Category / Photo Gallery / Re: CB-1 Mk2 Project on: April 13, 2018, 04:46:14 PM
Good idea using foam for the air cleaner. Should breath much better than that restrictive paper element. Might lean it out just a smidgen though.
2  General Category / Photo Gallery / Re: Some carb work and a road test on: March 13, 2018, 01:31:10 PM
Yes. With a 4cyl bike like this you have to find the sweet spot on each cyl.  Gotta think of it as 4 individual 100cc engines sharing a crank. The carbs have to be tuned individually and then synchronized with each other using a mercury meter so they work in unison to do an equal share of the work. Can lead to a lot of back and forth until you get it right.

 In a perfect world we would each have a spare set of headers with O2 sensors on each pipe and a synchronizer hose on each carb so we could tune for the perfect fuel/air ratio throughout the rev range but as it is we have do it with a little old fashioned science and back yard mechanical skills.

 Some folks like to use an infrared thermometer on the headers and fiddle with the carbs until they get the temps to show  + or - each other within a few degrees. As the bike warms up do these differences change? Back to the drawing board.  Angry

When you blip the throttle does your tach needle slowly drop back to the set idle?
 You're too lean.  Does it drop below the set idle before coming back up? You're too rich. Some guys like to "read" the color and amount of carbon on the plugs.  There's a lot of little tricks like that. Most will have you running in circles if you're a perfectionist. My next bike WILL have EFI.  Cheesy
3  General Category / Photo Gallery / Re: Some carb work and a road test on: March 12, 2018, 04:20:55 PM
You're a man who isn't afraid to tackle unpleasant jobs, I'll give you that.  I used gas proof o-rings instead of the (very expensive at the time) preformed ones for the float bowls when mine leaked. Just give them a light coat of silicone grease and push them into the groove as you work them around the corners.  Still holding years later.

The slight wandering idle may be do to typical emission leaness. I found 3 turns out to be the sweet spot for a nice steady beat and off idle throttle response but with factory exhaust you may find 2-1/2 to 2-3/4 to be better.  If you didn't grind off the stop tabs from your float bowl covers while you had them off you're limited on how far you can turn the idle screws in or out.
4  General Category / Photo Gallery / Re: First peek inside the valve cover on: January 24, 2018, 07:03:18 PM
You lucked out. I had a few tight clearances on my first valve check. Second time everything was within spec. Many times you can swap around shims without even replacing any. Have a notepad, pen, egg carton, and calculator handy. Organization and patience is key. One of those jobs where you wish you wouldn't of slept through H.S. math class.  Grin
5  General Category / Photo Gallery / Re: Just received my CB-1, I'm in love on: January 21, 2018, 10:23:11 AM
How do you like the higher gearing? Nice having a little more space between the gears and a bit of an overdrive, isn't is?

Is that still the stock muffler? I replaced mine with a Kerker slip-on soon after I brought her home in 1990. I run it with no packing now and as long as you don't rev it too high around town it is still low tone and tolerable. On the back roads winding her up into the meat of the powerband and hearing that exotic Ferrari sounding shriek overpower the wind noise is soooo sweet. Jekyll and Hyde.  Grin
6  General Category / Photo Gallery / Re: Cb400 fours, old and older on: January 06, 2018, 05:38:41 PM
Two mechanical jewels that were not well received by displacement hungry Americans when they were first sold here. Hard to believe that even the "modern" bike is almost 30 yrs. old.  Shocked
7  General Category / Photo Gallery / Re: Just received my CB-1, I'm in love on: December 31, 2017, 03:12:21 PM
Beautiful bike and scenery. Snow and bitter cold here. Cry  The CB-1 does have nice wide powerband for a .4 liter bike. Doesn't hurt that the stock gearing is like a farm tractor.  Cheesy
8  General Category / General Motorcycle Discussion / Re: Seeking Opinions on Wheel Color (Spare set) on: December 31, 2017, 02:44:42 PM
The wheels I've seen painted black look great.
9  General Category / Tech Corner / Re: Why the countershaft speedo drive? on: December 18, 2017, 02:59:55 PM
The speedo reads about 10% high on average. If you trade out the stock 41t rear sprocket for a 37t like many of us have to make highway runs less frantic you will be about perfect on your mph gauge/true speed calibration.
10  General Category / General Motorcycle Discussion / Re: New member here, introduction on: December 17, 2017, 02:50:37 PM
8 rocker arms per cylinder just to get that perfect valve arrangement Cheesy  Honda engineers were on top of their game back then.
11  General Category / General Motorcycle Discussion / Re: New member here, introduction on: December 15, 2017, 01:31:57 PM
That little engine is adorable (as my Niece would say). Cheesy  20cc of raw HP. Perfect for a string trimmer. I notice someone in your link mentioned it strange that Honda made a flathead but I know their older commercial engines that powered snowblowers and such used a flathead design so it is not unknown to them.

Nice collection of super clean bikes by the way. You'll love the CB-1 if you love mechanical things. Pulling the valve cover and seeing that gear driven valvetrain for the first time is aesthetically the same as pulling the back cover off of a swiss watch.
12  General Category / Tech Corner / Re: insulators on: December 13, 2017, 01:02:26 PM
Lube em up with some silicone grease. Not only will they slide back on easier but they will come back off easier next time.
13  Classifieds / For Sale / Re: FS: 1989 Honda CB-1 NC27 Clean!!! on: November 30, 2017, 10:06:18 AM
This looks like a super clean bike for anyone looking for a turn-key original. The already installed Hawk bars are a great plus for comfort, especially for someone getting up in the years whose wrists and back aren't what they used to be.
14  General Category / General Motorcycle Discussion / Re:'d better start listening - Yamaha XSR700 Coming to 'Merica in 2018 on: September 24, 2017, 01:16:01 PM
I'd ride that.
15  Classifieds / For Sale / Re: FS: Detroit Michigan 1990 Honda CB1 All Original 8900 Miles Runs Good $900 on: September 24, 2017, 01:05:05 PM
That's a great deal especially if you don't have to go into the engine. These things are a hoot.
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