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1  General Category / Tech Corner / Throttle cable adjustment on: August 30, 2018, 03:40:07 PM
I had been having issues with an irregular idle for some time now. My recent discovery is when the bike is nice and hot,  I can rotate the throttle-grip forward and cause the revs drop to 1500rpm (the idle speed the bike settles on 1-2 minutes after start-up but not fully warmed up). I have to apply a fair bit of force on the grip but it's repeatable.

This leads me to believe that the cables need adjusting for more slack. BTW this only occurs once the bike is hot and fully warmed up. I suspect heat expansion differential of the cable sheath or some other component is vs. the the actual steel cable is adding tension and essentially cracking the throttle open at temp.

I have yet to check the service manual but saw an adjustment nut near the throttle grip. I did a quick test and started the bike and fiddled with the nut adding tension and relaxing it but the RPMs didn't seem affected. Do I need to adjust at the carbs and if so is it possible to do without removing the tank??

EDIT: Problem fixed. I adjusted the nuts next to the throttle grip and was able to relax tension on the cable - 2mm of grip freeplay now.
2  General Category / General Motorcycle Discussion / Re: Just scored my "Dream" bike! on: August 30, 2018, 03:13:24 PM
Way to go, Bill! Jelly as usual! She's a beaut. What's top speed on the rascal and when are you going to post some videos?
3  General Category / General Motorcycle Discussion / Re: Introduction new member 12 year garaged gift on: May 02, 2018, 04:22:07 AM
pull the tank and air filter element and spray some Sta-Bil Fogging Oil into each carb throat
-Bill

Hi Bill, great advice as always.

Should he clean out the fuel path to the carbs first lest debris makes it way to the finicky carbs. Would be wise to do all to avoid a carb overhaul.

Also, please educate us the purpose of spraying "Sta-Bil Fogging Oil into each carb throat" does. Can't he just leave the tank on and go straight to the fuel priming steps?

I suggest inspecting the interior of the tank before doing anything. Could offer up some hints as to the condition of unobservable areas. My 2 cents  Wink.
4  General Category / General Motorcycle Discussion / Re: Introduction new member 12 year garaged gift on: May 02, 2018, 04:12:05 AM
Welcome back to motorcycling! Your story echos mine. I was away from bike 18 years and got lured back one year ago through a project bike (RVF400 which is still not running  Roll Eyes) I picked up a CB-1 in the meantime and it's a fantastic bike.
5  General Category / Tech Corner / Re: Race Tech cartridge emulators install and test on: April 29, 2018, 03:06:27 AM
Interested. PM me when available  Wink
6  General Category / Tech Corner / Re: Race Tech cartridge emulators install and test on: April 28, 2018, 08:06:05 PM
Thanks, Bill! As always, an exemplary write up. I like the clever travel gauge you devised.

Does this mean your BB shock will be for up for sale? Would it be better suited for for a 190# geared rider?
7  General Category / Tech Corner / Re: Reprise of: New bike a Republican? (aka my bike doesn't lean LEFT). on: April 18, 2018, 04:16:07 AM
On choke, mine slows or dies dies when I lean it left. No choke, leaning is fine. I plan to test:
Lean right.
Lean left as far as I can and see if fuel drips out vent.
8  General Category / Tech Corner / Re: Reprise of: New bike a Republican? (aka my bike doesn't lean LEFT). on: April 17, 2018, 02:02:59 AM
Thanks James. OK I was wrong about the bystarter jet, it is actually on the left side of the carb meaning they are submerged deeper in fuel when the bike is leaned left. So I'm not sure what is going on, but would still want to check float levels and all passageways in the bystarter circuit, especially the very tiny hole in the jet. Possibly the mystery hole is above the fuel level and therefore takes in air to help atomize the bystarter mixture, but when leaned too far left and with float level too high the hole takes in fuel making the mixture too rich?



-Bill

Hi Bill, what is the hole on the left chamber wall at the same level as the "crude hole"? From a manufacturing perspective how the heck did they drill the "crude hole" if it's orthogonal to the jet tube. There is very little working space.
9  General Category / Tech Corner / Re: Reprise of: New bike a Republican? (aka my bike doesn't lean LEFT). on: April 06, 2018, 11:18:19 AM
I'd really like to know, as my bike does it too.

Guessing it's one of the small channels in the carbs relating to the choke circuit which is blocked so that one or more carbs get no extra fuel at certain lean angles. Solution in that case would be a long soak in an ultrasonic cleaner.

I can tell you that replacing the seals doesn't fix it. That said, I'd still recommend getting a set of viton rubber seals at litetek.co if you're planning on splitting the carbs, they are cheap to buy and you'll definitely find at least one split and perished seal while you're in there.

Is there a connection or red herring regarding the other symptom of the engine slowly fading to 0 RPM when I'm stuck at a stoplight: choke off, fully warmed up, upright, throttle closed? The fan did come one during one of these bouts but doesn't seem to by directly responding to the fan being on (which could suggest an electrical issue).

Further, the RPMs can be kept alive (increased to say 2k RPM) by application of choke.

If a choke enrichens the mixture (right?) does that mean my bike might be improperly adjusted lean?

10  General Category / Tech Corner / Re: New bike a Republican? (aka my bike doesn't lean LEFT). on: April 06, 2018, 01:43:36 AM
The problem and them some have returned 8 months later  Angry

Since this thread went off topic toward the end I started a new one here http://www.hondacb1.org/forum/index.php/topic,5612.0.html

This thread is now locked.
11  General Category / Tech Corner / Reprise of: New bike a Republican? (aka my bike doesn't lean LEFT). on: April 06, 2018, 01:35:36 AM
I am posting this separate follow-on thread as the original went off topic ☺

http://www.hondacb1.org/forum/index.php/topic,5497.0.html

If you recall it started like this……

Okay wrench heads, I hope I came to the right place. It turns out my bike doesn't like to lean Left. Let me explain....

I just purchased a CB-1 with 10k miles. I am 3rd owner. Original owner was a dealer in NV and second owner bought for wife but she never rode it. He spiffed it up and sold it to me. Any ways it's cherry and I want to ride it.

During the sale we started the bike on the center stand. Seller also said the bike took a while to warm up. After 3-4 minutes of idling on choke at 3k rpm, he slide the choke off and kept the engine running. Maybe a little rough. I took it for a test ride. All was good enough so we closed the deal.

I went to start it today and found it a little difficult to get going  Sad

With choke on I have to work the throttle a little to keep the motor idling. It will idle steady for the most part.

Now imagine straddling the idling bike & holding it vertical. If I tilt the bike to the left say just 3-4 degrees from vertical (no handle bar turning so confident it is not cable binding) the rpms drop instantly. No lag. I can use the throttle to keep it running. Go vertical it recovers. Leaning to the right no problem.  Huh Hmm, who would have thought to start the bike on its side stand. Undecided To be fair, seller tuned it at 4,500' and I am at sea level.

Seller stated he rebuilt the carbs. Carb insulators are original and seller said he couldn't find replacements so reinstalled and used RTV to help "seal" them. Not ideal but not crazy.

Anyways, what should I look into? Is there to mix up carb parts?  i.e. on my NC35 carbs 1&3 and 2&4 have different bowls and emulsion tubes. If it is float bowl setting would that affect the RPMs so dramatically and immediately and why when only tilting to one side and not the other?


And it ended (for a while) like this….

I went to start up my bike today. Full choke, push starter, started right up. Revs rose to 3k and I kept her there for 10 seconds. Tilted left, no change. WTH!?! Tried again. Steady idle. Tilted further to and fro trying to get 'er to stumble but she'd have none of it.

After a minute or so on choke I saw the temp gauge bump so I started to ease off the choke to 50%. Idled fine. More rocking, etc. and no strange symptoms.

Popped open gas cap to see if there would be any change (vacuum maybe, who knows?). Nada. Lastly, set fuel cock to RES and no inking of change. Choke off after about 90 seconds. Idle settled to about 1200-1300.

Go figure, the demon has been exorcised! Grin At least for now. Roll Eyes

I rev'ed the engine for a few more minutes to see if any stumbling would occur. Nope, she purrs like a kitten. Well I'd like to claim I fixed the problem but I did absolutely nothing. If condition changes I will update y'all. Thanks for everyone's efforts.

Last week the bad mojo returned Angry I have been riding my bike more given the spring weather and for the past 250 miles no real issues. Then last week I was running in hot weather and the engine died while at a stop light. I could restart the engine and rev it but it seemed the engine was reluctant to idle and would drop and die. Rolling on the throttle would keep it going and even leaving the choke ½ way at stoplights to reduce my stall-out anxiety (so stressful!).

I suspect it may have had to do with the high engine temp and possibly the fan kicking on (electrical?). I continued on with my ride for another 30 miles and the 45 return trip without issue though it was cooler and late at night and all highway riding.

Then earlier this week leaving from work, bike on side stand, choke on, turn key, engine revs up to 3k. Put on gloves and helmet so after maybe 1-2 minutes lowered choke 1/2 way and straddled bike. Thought to lean the bike to the left for "fun" and the engine died!!! I tried again and could repeat the effects of leaning the bike. Lean left the idle drops and the engine struggles, move back upright and the engine recovers. By this time the bike was significantly warmer but still not quite in the normal running range on the gauge. I turn off the choke and lean to the left, this time no effect. For now it seems that the leaning left issue occurs only when the choke is ON.

Anyone have ideas on what could cause this strange behavior?
12  General Category / Tech Corner / Re: Trouble starting Power loss Cut off on: March 31, 2018, 09:21:55 PM
Ok wanted to give an update. After bypassing the cut off switch, changing batteries, extra cables, grounds and a new LT4 starter I still had the trouble. Got a tune for the car and it has yet to not start since, Even if the battery is weak and is draggy cranking it will still start in a couple spins. After digging in the old tune the injectors were set on 42lb, However I have 36 lb. Now it makes sense. The PCm may have not fired the injectors enough for starting if set like this, but I may be wrong. Either way it starts and runs good now. Thanks

Injectors? Surely you aren't talking about a normal CB-1.
13  General Category / Tech Corner / Re: choke issue while leaning on side stand on: March 31, 2018, 03:13:03 AM
I see someone else here posted what sounds like the same problem, but it cleared up on its own after a bit.
Maybe I'll be so lucky!

That was my posting. I feel your pain. It was the oddest behavior and wasn't 100% consistent. Some days were better than others. In my case the problem cleared up on its own. Though I don't recall if it was choke related or not, it probably was. The bike wasn't run much but once I did run more regularly the symptoms disappeared.

FWIW I recently spoke to Mike Nixon a carburetor guru and rebuilder based in the USA and he says the small fuel ports on our bike easily clog and that he runs Stabil fuel stabilizer year round on his bikes.
14  General Category / Tech Corner / Re: Gas cap help on: January 06, 2018, 05:59:08 AM
Hi Bill, good to find you on this forum site. If you read my RVF400 rebuild on BARF you'll see I went thru a gascap teardown. To get at the gasket you need not unbend the casting punches. In fact, I found them extremely brittle and broke a couple on the China knockoff that I tested on. Instead I used a flat bladed screwdriver to work under and around the rubber seal to "pry" out a metal washer (kinda like putting a tire bead onto a wheel rim) that is held in by the gasket. Once this large washer ring is removed there will be 3 screws buried under the gasket securing the rubber to the cap. Pell the rubber back and unscrew the 3 Phillips screws.

The China caps are of very decent quality esp for the price. I got a helmet lock, gas cap and ignition for $15! Shipped!

Following your work and inspired to make a few changes. Thanks!
15  General Category / Tech Corner / Re: New bike a Republican? (aka my bike doesn't lean LEFT). on: July 21, 2017, 02:08:33 AM
I went to start up my bike today. Full choke, push starter, started right up. Revs rose to 3k and I kept her there for 10 seconds. Tilted left, no change. WTH!?! Tried again. Steady idle. Tilted further to and fro trying to get 'er to stumble but she'd have none of it.

I realized the fuel cock was OFF so turned to ON and repeated motions. No change. After a minute or so on choke I saw the temp gauge bump so I started to ease off the choke to 50%. Idled fine. More rocking, etc. and no strange symptoms.

Popped open gas cap to see if there would be any change (vacuum maybe, who knows?). Nada. Lastly, set fuel cock to RES and no inking of change. Choke off after about 90 seconds. Idle settled to about 1200-1300.

Go figure, the demon has been exorcised! Grin At least for now. Roll Eyes

I rev'ed the engine for a few more minutes to see if any stumbling would occur. Nope, she purrs like a kitten. Well I'd like to claim I fixed the problem but I did absolutely nothing. If condition changes I will update y'all. Thanks for everyone's efforts.
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