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CB500 EXHAUST REMOVAL

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Grarea
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Posts : 177
Location : Cornwall

Re: CB500 EXHAUST REMOVAL

Post by Grarea on Tue 24 Jan 2017, 2:06 pm

I would be interested. Thanks.
I noted that all of the lugs on yours have a much squarer edge than mine (well, those and everything 
else in the photo)
Smile
Nice one.
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Grarea
Running out of unique names
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Posts : 177
Location : Cornwall

Re: CB500 EXHAUST REMOVAL

Post by Grarea on Wed 25 Jan 2017, 8:30 am

Well, now I am getting a bit confused.
When I spoke to Lings and Silver's, they had to go measure the gasket and we can say that they are along the lines of 43mm OD.

So, now I am wondering what the deal is.
Am I getting something wrong here?
It all seems a bit odd otherwise.

If the headers measure in at 41mm ish, and that should be the size of the gaskets, and 41mm seems to make a sense now (shame I ordered 40mm) although I would need to offer them up.

That would mean that every one else's header pipes are 43mm wouldn't it?
Or are people's headers 41mm but with a 43mm gasket?

So, i wouldn't mind trying to work this out as if something has been changed, I will keep getting the wrong bits.

I gave the engine number to Ling's and he double checked the gaskets for it for me.

I see that this website actually gives the measurements:
https://www.motorcycleproducts.co.uk/exhaust-gasket-honda-cb500-1998-99-copper-p-302873.html

So, mine is 98, on that website, I have looked at every variant I can find from 1993 to 2002 and they are all 43mm.

I am confused. I am wondering more if I could possibly be getting something wrong.
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Grarea
Running out of unique names
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Posts : 177
Location : Cornwall

Re: CB500 EXHAUST REMOVAL

Post by Grarea on Wed 25 Jan 2017, 1:32 pm

Right, it is me.  Embarassed

Thanks for all the comments.
When i look, the face that the gasket goes up against is dead clean and smooth.
I had a little prod and a scrape, but it was dead smooth. Smashing.

So,
I have just wedged myself in there and got myself a better light and a stronger tool.
If I go at it a bit, i can scrape quite a layer off the metal studs etc. Also around the edge of the orifice.

I haven't managed to get it in there yet, but i have definitely made a difference.
Quite a lot of scraping to do.
Thanks to the comment about the pick earlier and the photos of a better condition engine.

@sullivj

Right, back to scraping and dreaming of a bike stand.
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eternally_troubled
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Location : 'ere be fens. (near Cambridge)

Re: CB500 EXHAUST REMOVAL

Post by eternally_troubled on Wed 25 Jan 2017, 2:39 pm

@Grarea wrote:Yes, thanks, but yes I am aware of that.
Feel free to keep pointing out the obvious though.
I may have missed something.

It isn't getting anywhere near the old gasket.


I'm good at pointing out the obvious. I will stop if you ask ;)

I'm glad to hear that you scraping is having a positive effect. The front of my bike was a in a right state when I changed mine and a fair bit of scraping was required - so I'm not surprised that the same kind of corrosion is on other people's bikes too.
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Grarea
Running out of unique names
Running out of unique names

Posts : 177
Location : Cornwall

Re: CB500 EXHAUST REMOVAL

Post by Grarea on Wed 25 Jan 2017, 3:27 pm

That is what I was thinking when I started off.
But, I think I have sussed what was going on.

I think someone used too small a gasket at some point in the past and put a load of exhaust paste in there or something.
I reckon that is what I was scraping out.

On the plus side, what I thought was loads of rust on the headers is exhaust paste.
It is everywhere. Pretty solid stuff.

I have used a spot of grease to hold them in place.
Very Happy
Good tip.
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eternally_troubled
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Re: CB500 EXHAUST REMOVAL

Post by eternally_troubled on Wed 25 Jan 2017, 11:14 pm

@Grarea wrote:
I think someone used too small a gasket at some point in the past and put a load of exhaust paste in there or something.
I reckon that is what I was scraping out.

That sounds entirely possible - exhaust paste is clever stuff - the first time you heat it up it 'melts' and bubbles a bit then sets, runs into any cracks/gaps and then sets forever into a solid/slightly powdered form.

sullivj
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Location : Gatwick

Re: CB500 EXHAUST REMOVAL

Post by sullivj on Wed 25 Jan 2017, 11:44 pm

Glad you're making progress. Sorry I've not been able to measure mine yet - I'm away on business.

If you were closer to Gatwick, you could happily borrow my bike stand.
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badseeds
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Re: CB500 EXHAUST REMOVAL

Post by badseeds on Fri 27 Jan 2017, 2:05 am

@sullivj wrote:......Sorry I've not been able to measure mine yet - I'm away on business playing golf in Norfolk.

Very Happy

sullivj
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Posts : 2097
Location : Gatwick

Re: CB500 EXHAUST REMOVAL

Post by sullivj on Fri 27 Jan 2017, 6:51 am

@badseeds wrote:

@sullivj wrote:......Sorry I've not been able to measure mine yet - I'm away on business playing golf in Norfolk.

Very Happy

Haha. It was a decent hotel.

Checked my stock - I'm afraid I don't have any. I think Jerryfuddd does, I'll ask him.

sullivj
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Posts : 2097
Location : Gatwick

Re: CB500 EXHAUST REMOVAL

Post by sullivj on Sat 28 Jan 2017, 3:50 pm

Jeffyfudd had some Honda ones in stock..

OD = 42.08mm

ID =.34.06mm

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