Most motorcycle problems are caused by the nut that connects the handlebars to the saddle.

1.5 pots

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Grarea
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Location : Cornwall

1.5 pots

Post by Grarea on Sun 31 Jul 2016, 9:55 am

Can I pick you guys brains for five minutes please?

New to CB500s.
(Back to bikes after a ten year gap)

Here is the thing, it sounds a bit rough.
The problem is, I am used to a suzuki gsf650 and my previous was a hornet 600.
They are 4 cylinder and quite 'whizzy' sounding.
Very smooth.

So I am not sure what it is actually meant to sound like.
I listened to another guy's 04 (I think) CB500 and i don't think there was all that much difference.

Trouble is I have a noisy exhaust on it and it exagerrates the noise.

So, when i rev, (stationary) it pops occasionally.
Am I right in thinking that is unburnt fuel popping in the exhaust?

I took one of the ht leads off and it stalled. I took the other off and it seemed to make very little difference to the running.
Hence i think there is a problem.

I changed the plugs. (who decided that was a good place to put them?) They seem ok on the ends, but there is some crud on the threads and higher up. Is that normal? Or is evidence of something?


(Imagine a picture here of spak plugs. I am not allowed to put one on until I have been here seven days.)
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Jameshambleton
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Re: 1.5 pots

Post by Jameshambleton on Sun 31 Jul 2016, 10:03 am

The bike will idle on a single cylinder with a spark plug removed, only just but it does. 
This is mine I hope you'll be able to hear the engine sound over the song in places. 
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Grarea
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Re: 1.5 pots

Post by Grarea on Sun 31 Jul 2016, 11:00 am

Nice one.
That really helps. Thanks.
Mine isn't as bad as i thought.
Yours pops a bit as well. OK.

Mine idles fine on one cylinder but you can't even keep it going on the other with the throttle.

I tested the spark and that seems good. So I reckon carbs are next thought.
Right, bit short of time today, will have to come back to it later.
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Jameshambleton
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Re: 1.5 pots

Post by Jameshambleton on Sun 31 Jul 2016, 5:32 pm

Remove the HT lead to the one that seems to work and turn over the bike a few times, if it doesn't start  but fires some times then it's likely that the plug is fowled. Also check the smell of the exhaust and infact on the header check for heat, If one is working and you touch it it'll take your skin off but if you can touch it and it's fairly cold then it's not igniting. If you can smell petrol then the spark plug isn't sparking. 

If you remove the side stand side radiator cowl then you can easily access the connections for the coils check them for corrosion ect.
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Grarea
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Re: 1.5 pots

Post by Grarea on Fri 12 Aug 2016, 12:54 pm

Thanks for this.
I shall get on to that.
I don't think it is as bad as i thought it was.
The exhaust is quite a noisy one. I think it amplifies things more than I am used to.
Replaced the plugs. 
Here are the old ones. (I am allowed to post pictures now)
They look pretty gunky. Is that evidence of something? 
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Jameshambleton
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Re: 1.5 pots

Post by Jameshambleton on Fri 12 Aug 2016, 9:28 pm

That tbh been at the top of the thread rather than the bottom I would say it's more likely water that's gone down into the caps than anything else, maybe copperease but it would be a bit weird doing that for the plugs. The gap on them plugs looks pretty big, what plugs are they and what did you put in?
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Grarea
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Re: 1.5 pots

Post by Grarea on Sat 13 Aug 2016, 10:27 am

@Jameshambleton wrote:That tbh been at the top of the thread rather than the bottom I would say it's more likely water that's gone down into the caps than anything else, maybe copperease but it would be a bit weird doing that for the plugs. 

I would be surprised that water got in right under there eh?
I reckon you might have it with the grease thought.

I wouldn't be surprised at anything tbh.
The grips were put on with grease. 
They were sliding all over the place.
Actually quite disconcerting.

I put in NGK CR8EHIX-9 plugs.
It is definitely smoother now. I have done a couple of hundred miles since and it seems to have got better.
I will look at the coils etc when i get a chance. (I wiah i had the time this weekend but i don't)
I think that one wasn't working so well and now the new ones have cleared some gunk in there.

The ones that I removed were the same actually.
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eternally_troubled
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Re: 1.5 pots

Post by eternally_troubled on Wed 24 Aug 2016, 2:33 pm

It's probably fine. I bet the idle adjustment for one carb is slightly higher which is why one cylinder will run but the other one won't.

Have you done a carb sync? That can reduce some vibrations.

Mind you, it will never be the same as a 4 cylinder bike (which is one of the reasons I like it!).
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Grarea
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Re: 1.5 pots

Post by Grarea on Thu 25 Aug 2016, 8:14 am

No, not yet.
That is on the list.

(No idea what it entails, but will be thinking carbs after hangers, then steering bearings, then exhaust, then carbs.)
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stormbringer
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Re: 1.5 pots

Post by stormbringer on Thu 25 Aug 2016, 8:08 pm

Those look like Iridium plugs - and you replaced them with a new set of Iridium plugs. I run the same type...

Basically, they're fit & forget. Mine have done nearly 50.000 km by now and I'm thinking to replace them maybe next year.

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