Author Topic: Your Bike Ever Hissed At You? (Read 2263 times)

Greggo · « **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.

DJ_AX · « **Reply #1 on:** July 21, 2011, 02:58:58 pm »

snakes in your bike?

Greggo · « **Reply #2 on:** July 21, 2011, 03:50:05 pm »

Motherphucken Snakes On A Bike!

KingCustomCycles.com · « **Reply #3 on:** July 21, 2011, 03:57:38 pm »

You need a Catholic Priest or an electrician.

crackerbat · « **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.

KingCustomCycles.com · « **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

fmctm1sw · « **Reply #6 on:** July 21, 2011, 04:02:46 pm »

My gas cap will do this...

KingCustomCycles.com · « **Reply #7 on:** July 21, 2011, 04:05:30 pm »

Your gas cap hisses when you turn the key on? That is weird.

camelman · « **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?

72 yellow · « **Reply #9 on:** July 21, 2011, 05:25:31 pm »

Bike has never hissed at me, wife on the other hand........

Greggo · « **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.

camelman · « **Reply #11 on:** July 21, 2011, 05:38:50 pm »

Check my previous post. It could be electric chatter.

fmctm1sw · « **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.

Greggo · « **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.

Greggo · « **Reply #14 on:** July 22, 2011, 11:10:43 am »

Cleaned all the contacts. The bike has a 50 amp fuse

WarwickE36 · « **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.

Greggo · « **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.

Really? · « **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?

WarwickE36 · « **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

Greggo · « **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.

Greggo · « **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?

Really? · « **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.

Spanner 1 · « **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

Greggo · « **Reply #23 on:** July 22, 2011, 12:33:01 pm »

Will do.

Thanks Tipper.

Greggo · « **Reply #24 on:** July 22, 2011, 12:33:13 pm »

And Spanner.

Really? · « **Reply #25 on:** July 22, 2011, 12:33:25 pm »

Now knowing what that is, still put the 15 amp in and feel better knowing either way.

Greggo · « **Reply #26 on:** July 22, 2011, 12:34:53 pm »

THIS is why I ask questions. THIS is why I love, and donate to, this forum.

Deltarider · « **Reply #27 on:** July 22, 2011, 12:46:54 pm »

Quote

Your Bike Ever Hissed At You?

Maybe it tries to fart.

Greggo · « **Reply #28 on:** July 22, 2011, 01:12:27 pm »

Installed the 15 amp fuse, and everything still works. I haven't ridden today, but she started, and revved fine with the lights on high, the turn signal on, and the brake light activated.

The bike does have coils from an 80's Honda, with an OHM rating in the three point somethings. Is it safe to put a 20 amp fuse in, or carry one in case I blow the 15 (just to limp home on)??

Duke McDukiedook · « **Reply #29 on:** July 22, 2011, 01:14:26 pm »

Only when I threaten to throw it out for scrap.

TwoTired · « **Reply #30 on:** July 22, 2011, 02:13:18 pm »

I think a 20 will be fine. I know some of the 650s had a 30 Amp main fuse. I'd be uncomfortable using that in a Cb500, though.

Hissing from an electrical panel, does sound like some sort of arcing. Check all the plug terminals for change of color/corrosion, etc. Then look at all the crimp connections from wire the terminals of plugs/sockets.

You could also move each wire in the area gently without moving others, to see if you can cause the hissing. If so, you've just gotten closer to the source.

Cheers,

jacquesleclochard · « **Reply #31 on:** July 22, 2011, 02:48:46 pm »

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.

Popping, or "sneezing"? Mine does that at the situation you described.
It's silent at a cold start, but after a short run the engine "sneezes".
Should be a carb problem, then.

camelman · « **Reply #32 on:** July 22, 2011, 05:20:28 pm »

The hissing might be fuel combusting in the cylinder and escaping past the intake valve. Engines often stop at the same rotation angle, so if that angle corresponds with fuel being near the plug and a points system that erroneously fires when you turn on the ignition, then you could get a hiss from escaping combusted gases. That situation would require a fuel leak, excess fuel in the intake runner, or something of the sort, to migrate fuel into the cylinder while the engine is at rest and old points that need to be dressed.

Camelman

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Author Topic: Your Bike Ever Hissed At You? (Read 2263 times)

KingCustomCycles.com

KingCustomCycles.com

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