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Author Topic: Your Bike Ever Hissed At You?  (Read 2683 times)

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Offline Greggo

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Your Bike Ever Hissed At You?
« on: July 21, 2011, 02:43:09 PM »
Every once in a while, my '71 CB500-4 will hiss at me from the electric panel behind the left side cover.  It only happens when I turn the key to the on position.  ???  It only happens sporadically too, maybe once every two or four months.  It lasts about a second, then I don't hear it again.  All the lights and electronics seem to still functions as they should.
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Offline DJ_AX

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Re: Your Bike Ever Hissed At You?
« Reply #1 on: July 21, 2011, 02:58:58 PM »
snakes in your bike?
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~ Vincent . . . '75 CB750 K5 . . . '97 BMW r1100rt . . . had; '75 CB550 K1 (sold) . . .  '73 CB350G (gifted) HELL YEAH!
Disclaimer: I could be wrong. :)

Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #2 on: July 21, 2011, 03:50:05 PM »
Motherphucken Snakes On A Bike!
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KingCustomCycles.com

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Re: Your Bike Ever Hissed At You?
« Reply #3 on: July 21, 2011, 03:57:38 PM »
You need a Catholic Priest or an electrician.
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Offline crackerbat

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Re: Your Bike Ever Hissed At You?
« Reply #4 on: July 21, 2011, 03:58:40 PM »
Quote from: KingCustomCycles.com on July 21, 2011, 03:57:38 PM
You need a Catholic Priest or an electrician.

He's old enough to drive.  It'll be easier getting an electrician.
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KingCustomCycles.com

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Re: Your Bike Ever Hissed At You?
« Reply #5 on: July 21, 2011, 04:00:33 PM »
Quote from: crackerbat on July 21, 2011, 03:58:40 PM
Quote from: KingCustomCycles.com on July 21, 2011, 03:57:38 PM
You need a Catholic Priest or an electrician.

He's old enough to drive.  It'll be easier getting an electrician.

Can I get an AMEN!  LMAO
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Offline fmctm1sw

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Re: Your Bike Ever Hissed At You?
« Reply #6 on: July 21, 2011, 04:02:46 PM »
My gas cap will do this...
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Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250

KingCustomCycles.com

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Re: Your Bike Ever Hissed At You?
« Reply #7 on: July 21, 2011, 04:05:30 PM »
Your gas cap hisses when you turn the key on?  That is weird.
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Offline camelman

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Re: Your Bike Ever Hissed At You?
« Reply #8 on: July 21, 2011, 04:40:59 PM »
Haha, second in the catholic priest. Pretty effen funny.

Could the hissing be sparks arcing in the fuse box?  Have you cleaned the fuses lately, or the contacts on the solenoid?
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1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline 72 yellow

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Re: Your Bike Ever Hissed At You?
« Reply #9 on: July 21, 2011, 05:25:31 PM »
Bike has never hissed at me, wife on the other hand........ :D
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Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #10 on: July 21, 2011, 05:29:18 PM »
Quote from: fmctm1sw on July 21, 2011, 04:02:46 PM
My gas cap will do this...

Nope.  It's definitely coming from under the left side cover where the electric 'panel' is located.  I just don't know which piece of that assembly would be capable of making that noise.  It's almost like a soda bottle opening.
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Offline camelman

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Re: Your Bike Ever Hissed At You?
« Reply #11 on: July 21, 2011, 05:38:50 PM »
Check my previous post. It could be electric chatter.
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1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline fmctm1sw

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Re: Your Bike Ever Hissed At You?
« Reply #12 on: July 21, 2011, 06:08:55 PM »
Quote from: KingCustomCycles.com on July 21, 2011, 04:05:30 PM
Your gas cap hisses when you turn the key on?  That is weird.

No, just in general sometimes.  A lot of times after a ride.
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Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250

Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #13 on: July 21, 2011, 06:09:55 PM »
Quote from: camelman on July 21, 2011, 05:38:50 PM
Check my previous post. It could be electric chatter.

Oops, missed that.  I'll check the contacts again, but I did clean them the first time I heard it happen.
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Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #14 on: July 22, 2011, 11:10:43 AM »
Cleaned all the contacts.  The bike has a 50 amp fuse  :o
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Offline WarwickE36

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Re: Your Bike Ever Hissed At You?
« Reply #15 on: July 22, 2011, 11:24:30 AM »
My bike has never hissed per se.  It has however given a nice pop upon turning the key to on with the kill switch already in the on position.  It happens before I hit the starter or kick obviously.  I assume gas is still in the cylinder but never got fired.  And it fires when the ignition is put to on and the coil is powered up. 
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s

Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #16 on: July 22, 2011, 11:54:17 AM »
Quote from: WarwickE36 on July 22, 2011, 11:24:30 AM
My bike has never hissed per se.  It has however given a nice pop upon turning the key to on with the kill switch already in the on position.  It happens before I hit the starter or kick obviously.  I assume gas is still in the cylinder but never got fired.  And it fires when the ignition is put to on and the coil is powered up. 

That's an interesting thought.  I always leave my kill switch in the on position, and like I said, it is kind of a soda bottle hiss and pop sound.  I've also noticed it seems to happen the day after I've started the bike for a minute or so to test something, but not ridden it. 
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Offline Really?

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Re: Your Bike Ever Hissed At You?
« Reply #17 on: July 22, 2011, 12:16:23 PM »
50 amp fuse don't sound right.  Look behind the fuse block to see if you are getting too hot and melting back there?
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I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3

Offline WarwickE36

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Re: Your Bike Ever Hissed At You?
« Reply #18 on: July 22, 2011, 12:21:46 PM »
Mine sounds a bit like popping the cork on some bubbly, Greggo.  Not nearly as loud though.  I'd say it happens maybe 1/30th of the time.  Very infrequent
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s

Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #19 on: July 22, 2011, 12:26:31 PM »
Quote from: TipperT on July 22, 2011, 12:16:23 PM
50 amp fuse don't sound right.  Look behind the fuse block to see if you are getting too hot and melting back there?


I do have some 15 amps I could throw in and see if everything still works..should I try?  I don't want to create problems; the bike's been running fine for two thousand miles.  I do periodically check all my wire connections, and nothing is melted.
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Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #20 on: July 22, 2011, 12:29:17 PM »
The bike's got one of those Radioshack single fuses (that's what HondaMan told me at least).  The fuse in there right now is marked 50, and the rod in the fuse tube is purty thick, so...that means I've got a 50 amp fuse in there, right?
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Offline Really?

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Re: Your Bike Ever Hissed At You?
« Reply #21 on: July 22, 2011, 12:31:58 PM »
If you put the 15 amp in there and it blows, then you have a problem you need to fix.  Better for the fuse to blow than you riding a fireball!

I replaced the fuse block on the 750.  Is was melted behind it and so were many of the wires.  I replaced the harness at the same time too.

So, in short, yes, put the 15 amp in and see what happens.  Keep the other 15 amp where you can get it if needed.
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I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3

Offline Spanner 1

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Re: Your Bike Ever Hissed At You?
« Reply #22 on: July 22, 2011, 12:32:28 PM »
You do know that witha 50A fuse in your bike it could catch fire, burn-down your house and the whole neighborhood before that 50A fuse would blow ( I'm 1/2 serious ! ).
Put a 15A in there lickety-split  :o :o
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If your sure it's an ignition problem; it's carbs....

Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #23 on: July 22, 2011, 12:33:01 PM »
Will do.

Thanks Tipper.
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Offline Greggo

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Re: Your Bike Ever Hissed At You?
« Reply #24 on: July 22, 2011, 12:33:13 PM »
And Spanner.
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