Search found 21 matches

by entropy
Tue Oct 01, 2013 12:32 pm
Forum: Everything else
Topic: Bad news
Replies: 12
Views: 7888

Re: Bad news

I'm glad to hear you're in (more or less) one piece. I hope you mend quickly and get this all put behind you soon. Thanks for all your excellent service and help here on the forum. We'll miss you, so I hope you drop in with an occasional picture of where your dirtbike takes you.
by entropy
Thu Sep 26, 2013 8:53 pm
Forum: Show it off
Topic: First Bike
Replies: 6
Views: 3441

Re: First Bike

Great to see the motorcycle coming together with work. :)
by entropy
Wed Sep 25, 2013 10:02 pm
Forum: Technical Discussion
Topic: Tank Cleaning
Replies: 9
Views: 3636

Re: Tank Cleaning

Don't forget to clean out the coating of mineral spirits that WD-40 leaves behind before you try to seal it. ;)
by entropy
Wed Sep 25, 2013 3:59 pm
Forum: Technical Discussion
Topic: Silly newb question. . . removing sparkplugs??
Replies: 14
Views: 7677

Re: Silly newb question. . . removing sparkplugs??

Reposting this from another thread: Re the plugs: If you don't have the Honda spark plug tool (from the tool bag), you may have to modify a socket to fit. There are a hundred threads on the internet on how to get these plugs out, where you can maybe find a socket, etc. I, having no luck finding this...
by entropy
Wed Sep 25, 2013 1:59 pm
Forum: Show it off
Topic: New to the forum, new '81 CB650C
Replies: 9
Views: 4781

Re: New to the forum, new '81 CB650C

I picked up an '81 CB650C parts bike across town for a song and a dance. https://lh3.googleusercontent.com/-5wPcS0U-4AM/Uj7-KMGoTWI/AAAAAAAAEXw/Iu-5OG325Pw/w465-h297/IMG_20130921_105249.jpg It has a little right-side damage. It looks like it suffered some mild right-side incident (both right side tu...
by entropy
Wed Sep 18, 2013 12:51 pm
Forum: Technical Discussion
Topic: starter Problems
Replies: 13
Views: 4661

Re: starter Problems

12.0 V open-circuit (nothing loading it) is a nearly-fully-dead battery. ~12.6 V is charged.
by entropy
Tue Sep 17, 2013 8:48 pm
Forum: Technical Discussion
Topic: How much extra current is available on an '81 CB650C?
Replies: 3
Views: 1533

Re: How much extra current is available on an '81 CB650C?

Hmm. Good idea. 50 mW LED lamp versus a 2 to 3 W lamp, times a few of them...

Any idea where I might find a list of the bulb sizes used behind the indicator panel and inside the gauges?
by entropy
Sun Sep 15, 2013 7:36 pm
Forum: Technical Discussion
Topic: How much extra current is available on an '81 CB650C?
Replies: 3
Views: 1533

How much extra current is available on an '81 CB650C?

I know that the CB650s of this era have a reputation for anemic charge systems, but I'm wondering if anyone has tested just how anemic. I'd like to steal almost exactly one amp (worst-case), i.e. about 12-14 W, to charge my amateur radio handheld in the tank bag while on a long upcoming trip. Normal...
by entropy
Sun Aug 25, 2013 6:05 pm
Forum: Technical Discussion
Topic: Bypassing CV carbs vacuum controlled petcock
Replies: 17
Views: 8323

Re: Bypassing CV carbs vacuum controlled petcock

Hmmm. My '81 CB650C (which is 99.8% identical to the CB650) shut-off has the vacuum port on the rear and a completely different shape. It looks more like the one on the right in this earlier picture you linked , but with the port facing rearward instead of coaxial with the fuel lines. For all I know...
by entropy
Sun Aug 25, 2013 5:51 pm
Forum: Technical Discussion
Topic: Engine smothers down after warming up (Carbs?)
Replies: 8
Views: 4065

Re: Engine smothers down after warming up (Carbs?)

Re the plugs: If you don't have the Honda spark plug tool (from the tool bag), you may have to modify a socket to fit. There are a hundred threads on the internet on how to get these plugs out, where you can maybe find a socket, etc. I, having no luck finding this no-longer-made Honda socket for les...
by entropy
Mon Aug 05, 2013 8:47 pm
Forum: Show it off
Topic: New to forum and the cb650
Replies: 9
Views: 5066

Re: New to forum and the cb650

Welcome! Post some pictures when you can. :)
by entropy
Thu Aug 01, 2013 9:10 am
Forum: Technical Discussion
Topic: Looking to buy cb650 custom: blue smoke on start up
Replies: 5
Views: 2503

Re: Looking to buy cb650 custom: blue smoke on start up

Yeah, that much oil after only a day of sitting: price the motorcycle as if the engine is going to need to be pulled apart at some level. I.e., not a running motorcycle, because it won't run for long as-is. (You'll foul plugs like mad, for one.)
by entropy
Wed Jul 31, 2013 2:04 pm
Forum: Technical Discussion
Topic: Looking to buy cb650 custom: blue smoke on start up
Replies: 5
Views: 2503

Re: Looking to buy cb650 custom: blue smoke on start up

Before you started it, how long had it sat since it was last started? (That is, how long did it take to accumulate that much oil to burn?)
by entropy
Tue Jul 30, 2013 1:01 pm
Forum: Technical Discussion
Topic: 80 cb650c valve clearance? ...I'm NOT 180 degrees off
Replies: 16
Views: 5500

Re: 80 cb650c valve clearance? ...I'm NOT 180 degrees off

You have spark on both the compression stroke *and* the exhaust stroke. This motorcycle uses a "wasted spark" system, where it fires 1 & 4 at the same time, 2 & 3 at the same time. That means either 1 *or* 4 will be on the compression stroke, but both will spark; 180 degrees of cra...
by entropy
Mon Jul 29, 2013 8:52 pm
Forum: Technical Discussion
Topic: 1981 CB650C problem with ... carbs? Ignition? Help!
Replies: 10
Views: 4402

Re: 1981 CB650C problem with ... carbs? Ignition? Help!

Over two days of riding 70 total miles the twisting roads in the Appalachians here, rough gas pump math says ~46 mpg (20 km/L). Based on my trip lengths, average speeds were around 35-40 mph.

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