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Author Topic: at wits end. 1982 cb650sc not starting  (Read 5346 times)

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Offline egar

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Re: at wits end. 1982 cb650sc not starting
« Reply #25 on: February 03, 2006, 09:14:15 AM »
When I dragged my 550 home last summer, I could get it to turn over but got no spark. I got hold of a wiring diagram and figured out that the kill switch was faulty. As soon as I bypassed the kill switch (as a temporary measure) the old girl fired right up.
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Offline rab1dwolf

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Re: at wits end. 1982 cb650sc not starting
« Reply #26 on: February 03, 2006, 10:25:53 AM »
I did the spark test and it worked. I'll try it again to make sure BEFORE I put everythign back together.

I'm really hoping that the extensive carb cleaning worked
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Offline Terry in Australia

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Re: at wits end. 1982 cb650sc not starting
« Reply #27 on: February 03, 2006, 02:32:47 PM »
Quote from: eurban on February 03, 2006, 05:28:44 AM
Sounds like you are getting lost in too many suggestions with too many specifics !  Here's another :D  Don't  worry too much about specific problems in your  ignition unless you are unable to produce a spark when you hold a wired plug next to the engine and crank the motor (kill switch set to run)  This a pretty basic test. Part of the spark, fuel, air thing.

That's it mate, gas, compression, and spark. That's all you need to get it to run, all the other minor adjustments/checks can be done afterwards, so don't stray from the true path, ha ha! Cheers, Terry. ;D
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Offline rab1dwolf

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Re: at wits end. 1982 cb650sc not starting
« Reply #28 on: February 03, 2006, 08:45:17 PM »
Quote from: Terry in Australia on February 03, 2006, 02:32:47 PM
That's it mate, gas, compression, and spark. That's all you need to get it to run, all the other minor adjustments/checks can be done afterwards, so don't stray from the true path, ha ha! Cheers, Terry. ;D

heh thats been my problem everything I've check has passed the tests.  I'm thinking/hoping that the carbs being dirty was causing it.

on a side note: when I removed the pilot screws I counted 7-9 rotations but it can only go in a max of 5.  So I really don't have a clue what their proper setting is but I figure I can monkey with them once I get the bike (hopefully) running.
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1982 cb650sc nighthawk.  the work never stops.

Offline cb650

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Re: at wits end. 1982 cb650sc not starting
« Reply #29 on: February 04, 2006, 05:32:57 AM »
If you still have the carbs off get rid of the vacum pos.  One less thing to worry about.



                   Terry
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Offline eurban

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Re: at wits end. 1982 cb650sc not starting
« Reply #30 on: February 04, 2006, 05:44:26 AM »
As I recall on my 81 650c the idle mixture screws came stock wth antitamper caps so the adjustment range was only a half turn or so.  It was easy enough however to file the stop on the bowl inoder to let the screws turn freely.  I can't see why your bike wouldn't also have come with these screws originally so it is highly likely that someone has gone to the trouble of making it possible to fully turn these screws  and also very likely that the mixture settings have been messed with by the previous owner.  9 or even 5 turns out seems way off to me but I can't remember for sure (I no longer have my 650) If you don't have a manual (why the h  not?) ask someone who does what the base settings should be for the mixture screws.  I will be pretty suprised if it is anywhere near 7-9 turns out.  Good luck
« Last Edit: February 04, 2006, 05:46:16 AM by eurban »
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Offline cb650

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Re: at wits end. 1982 cb650sc not starting
« Reply #31 on: February 04, 2006, 06:00:43 AM »
82 US model 650 is 2 1/4 turns out.



            Terry
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Offline rab1dwolf

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Re: at wits end. 1982 cb650sc not starting
« Reply #32 on: February 04, 2006, 09:19:04 AM »
yeah I don't really like that vacuum thing.  I took it apart and cleaned it on principal and I beleive thats where the old gas goop came from as it was pretty nasty in there.  I'm not gonna bother reconnecting it just right yet.
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1982 cb650sc nighthawk.  the work never stops.

Offline cb650

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Re: at wits end. 1982 cb650sc not starting
« Reply #33 on: February 04, 2006, 01:42:36 PM »
Take it off and plug the carb it gets vac from.  If you get it sorted out you can rebuild it and put it back on.   I take it off all my bikes.



                          Terry
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Offline rab1dwolf

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Re: at wits end. 1982 cb650sc not starting
« Reply #34 on: February 04, 2006, 09:21:05 PM »
will do.  I still cant find that stupid O-ring so it looks like the bike gets to sit a little while longer until I can find somewhere to order it from.

I am gonna go on an expedition tomorrow to all the hardware/automotive stores to see if I can't find it though just in case I missed somewhere
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Offline rab1dwolf

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Re: at wits end. 1982 cb650sc not starting
« Reply #35 on: February 06, 2006, 05:09:02 PM »
well absolutely no one has the oring where I live.  The only motorcycle shop opened today said they had to order the whole pilot screw assembly if i wanted that oring.  hopefully the shops opening back up tomorrow might have some luck.

on a side note I was gonna steal one off my friends 450sc but his limiter cap doesnt allow me to remove the scre AT ALL so that plans shot.
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1982 cb650sc nighthawk.  the work never stops.

Offline TwoTired

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Re: at wits end. 1982 cb650sc not starting
« Reply #36 on: February 06, 2006, 05:48:19 PM »
Quote from: rab1dwolf on February 06, 2006, 05:09:02 PM
on a side note I was gonna steal one off my friends 450sc but his limiter cap doesnt allow me to remove the scre AT ALL so that plans shot.

Doesn't that cap pull off with some persuasion?  Just a guess.  I mean, it had to be adjusted and then put on.  Why can't it be pulled off?

Hmm...
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Lloyd... (SOHC4 #11 Original Mail List)
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Offline rab1dwolf

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Re: at wits end. 1982 cb650sc not starting
« Reply #37 on: February 06, 2006, 05:58:02 PM »
well i think its loctited on.  The book says not to try and remove it cause you could damage it.  I'd hate to break something on his bike:)


As for my screw it went in 5 turns.  I think the screws were just gunked up and may not have been actually in the threads the last 2 turns i did when removing them.  I've got them in as far as they go with that stupid limiter cap on there so I'll have to see how it works.

I noticed Sirius consoladated out of canada sells carb rebuild kits for ~$20 so worst case scenario I can always order those if the shops I check tomorrow dont have/cant get the oring
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1982 cb650sc nighthawk.  the work never stops.

Offline TwoTired

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Re: at wits end. 1982 cb650sc not starting
« Reply #38 on: February 06, 2006, 06:17:39 PM »
Lots of loctite will soften with heat.  Large mass tip soldering iron should do it.  Is there enough stem exposed behind it to clamp on a forceps to block the heat from getting to the oring?  Don't want to melt that. ::)

Oh well, I guess I must be bored, or something...

Cheers,

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Lloyd... (SOHC4 #11 Original Mail List)
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Offline eurban

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Re: at wits end. 1982 cb650sc not starting
« Reply #39 on: February 06, 2006, 06:37:13 PM »
Well . . . . . like I said earlier the easy fix for the limiter cap is to file the stop on the carb body (or bowl I can't remember quite where the stop was) inorder to allow the screws to turn fully.  Infact I think you are better off with the limiter cap on the pilot screw because it is very easy to reach up under there and adjust compared to the flat head screws on the earlier carbs.  Of course this might not be the ticket for your buddies bike.  If the stop is on the carb bowl then perhaps you could remove the bowl on your buddies bike and then the screw?
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