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April 21, 2019, 08:12:09 AM *
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1  General Category / Tech Corner / Re: Fire during warm up 2 on: Today at 12:41:01 AM
Got tank off today. I now know it's supposed to be one shield...mine burned into two pieces. Lol!

I may need a new pump since the wiring is damaged. Plus the points cover is basically gone. Any suggestions on repair or evaluating the pump's condition? I've read many bad reports about generic pumps on ebay.

My fb post here https://m.facebook.com/groups/1119747858086718?view=permalink&id=2414794988581992
2  General Category / Tech Corner / Re: Fire during warm up 2 on: April 20, 2019, 04:37:02 AM
Hi Bill,

Sorry for the delayed reply. I don't come on here much.

I picked up a complete fuel line kit and and shield (plus some fender stuff I didn't need (sold as set) from Japan. Posted about it on the facebook CB-1 group: https://www.facebook.com/photo.php?fbid=10157350112460854&set=pcb.2372623069465851&type=3&theater&ifg=1

The function of the shields? I don' t know to be honest. Maybe heat, fire or dirt deflectors. I never found the smaller on in the parts fiche. Your bike doesn't have them?

Also got points from eBay https://www.facebook.com/photo.php?fbid=10157350291165854&set=pcb.2372734732788018&type=3&theater&ifg=1

I had the same thoughts how could the points start a fire? I never detected or since smelled fumes.

I've been too busy to do the repair. Further, I'm thinking a new pump might be wise. I'll try to make time to diagnose this weekend.

-Rick

3  General Category / Tech Corner / Re: Fire during warm up 2 on: March 08, 2019, 03:41:09 AM
With the left side cover off I can see mostly what happened. There is melted plastic from a large cover shield just below the tank.  Flames from below melted it. The fuel pump points appear to be the origin since it is the most damaged area. The burnt plastic cover around the points is carbonized and crumbles under pressure. Damaged plastic elsewhere has more integrity and still flexes. I figure the points over heated and flames spread from there.

Luckily the tank looks fine except for scorched paint on its dangling flange. It was right in the path of the flames.

To do list - buy fuel pump, points, large and small plastic shields (both NLA but found large one on Japaese auction which I won. $10). Probably get new battery. Why risk an acid leak. The cables look decent and I think a layer of heat shrink will make them good as new. Replace any dubious crimps. New fuel line(s) and maybe filter (bought $50 fuel kit from Japan, too). I will drain the tank and remove it to get an even better diagnosis. So far it all seems doable.
4  General Category / Tech Corner / Fire during warm up 2 on: February 25, 2019, 12:46:22 AM
Add'l post to add more photos
5  General Category / Tech Corner / Fire during warm up on: February 25, 2019, 12:28:13 AM
Since the weather was dry and not too cold I felt it was a good time for an afternoon ride. I wheeled the CB-1 out of the garage on to the driveway. I noticed 1/2 tsp. of oil on the garage floor  Huh. It's been 3 weeks since I took her out. I figured I'd have to check this out when I had more time. For now I wanted to ride.

I put the choke on and she started on the first try Smiley. That's kinda rare actually. So far so good. I walked back into the house to grab my boots and tank bag.

About 2 minutes from starting I walked back to the bike. It was then that I saw smoke wafting up from under the tank. Lots of white smoke. So much so I thought it was steam. I suspected a coolant leak or dripped oil burning off the exhaust. Looking closer there was way more smoke than that and it smelled like burning plastic. That's when I noticed flames inside beneath the tank near the rear shock!!!  Shocked Shocked Shocked

I shut the bike off and tried to blow the flames out. No luck  Sad. To gain better access and starting to get really nervous I tried to remove the seat but I couldn't get it off (CB-1 seat removal is fiddly under normal conditions and harder under duress). Panic setting in I ran to the garage but couldn't find the fire extinguisher (I later found it hanging on the wall where it has always been for 15 years but I wasn't thinking clearly )  Undecided . Luckily a garden hose was nearby and I used it to douse the flames  Wink .  

Aftermath: Black soot covered the tank sides but luckily wipes off easily. Inside there is melted plastic and the paint on the underside of the tank got scorched. Part of the vinyl seat cover excess near the staples got burnt. Honda use flame retardant vinyl and it smolders rather than burns. Luckily the tank fuel line that scorched didn't burn through...that would have been really ugly. The front left corner of the battery also got melted but no acid leak. Other parts are melted and burnt but I don't know their function. I feel fortunate that this all happened on my driveway and not while riding. Undecided Undecided Undecided

Question: This ever happen to anyone else? What could or should have done to avoid this? I don't know the CB-1 so well so I guess I have yet another project. I feel it might be electrical since the bike wasn't running for more than 2-3 minutes so the engine shouldn't have got that hot, right? My CB-1 has always been a reliable and fun bike so I'm feeling bummed but mostly feeling fortunate that it wasn't a complete loss.
6  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.
7  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?
8  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.
9  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.
10  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
11  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?
12  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.
13  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.
14  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?

15  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.
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