Right gasket set but different head gasket.

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GeorgeSweety
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Right gasket set but different head gasket.

Postby GeorgeSweety » Sat Aug 12, 2017 3:19 pm

Title of ebay listing for gasket set
"Complete Gasket Set Full Honda CB650 CA-SC Custom S.O.H.C. 1980-1984"
The trouble is the head gasket is different to the one on my bike. The one on the bike has a separate tin framed rubber gasket that goes around the camchain tunnel but the one in the kit doesn't. Also the one from the kit doesn't line up with the front cylinder head bolt holes. Any suggestions as to why it is different? Anyone know where I can buy the correct one from? :roll:

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GeorgeSweety
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Re: Right gasket set but different head gasket.

Postby GeorgeSweety » Sat Aug 12, 2017 4:25 pm

I have found the correct gasket (I hope). It should be part number 12251-426-306 just in case anyone else has the same problem. I have no idea why the head gasket from the NE set is different to the one on the bike. With my bike being imported to the UK from the US, surely a different head gasket wouldn't be used for a different market? :roll: I'm just clutching at straws here and I haven't got a clue what I'm talking about :? Waits for the more knowledgeable to arrive :lol:

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tario
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Re: Right gasket set but different head gasket.

Postby tario » Sun Aug 20, 2017 12:45 pm

Hmm, I think the head bolts should be in the same spot for every engine in a cb500, cb550, cb650. The bores are all different so head gaskets aren't really interchangeable and the castings don't all line up seamlessly. But the point i'm getting at is the gasket sounds faulty if holes clearly miss their mark. Or possibly a 750 gasket? 1985+ cb650 DOHC gasket?
1979 cb650
1980 cb650

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GeorgeSweety
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Re: Right gasket set but different head gasket.

Postby GeorgeSweety » Sun Aug 20, 2017 2:39 pm

Hi tario, nobody was more surprised than I was that the gasket in the kit was different to the one on the bike. Check out the differences in these two links, the first one isn't the actual item I bought as that was only shown inside the packet, this listing is for the identical set though.
http://www.ebay.co.uk/itm/FULL-GASKET-K ... 1325282623

This one is identical to the one that came off the bike, if I could work out how to post pictures here I'd photograph them side by side.
https://www.cmsnl.com/products/gasket-c ... Zngzfh94nQ

You can clearly see the steel frame around the camchain tunnel in the second link.

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GeorgeSweety
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Re: Right gasket set but different head gasket.

Postby GeorgeSweety » Mon Aug 28, 2017 10:12 am

Image

The gasket at the top is the same as the one taken off the engine, the bottom gasket is the one supplied in the kit. There are more differences than just the camchain tunnel and the front bolt holes being out of line.

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GeorgeSweety
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Re: Right gasket set but different head gasket.

Postby GeorgeSweety » Mon Aug 28, 2017 3:05 pm

Be careful when buying a head gasket for your bike, the top gasket in the picture in my previous post is a genuine Honda part with a part number 12251-426-306 ,some sellers are selling the bottom gasket in the picture with the same part number. My advice would be that if you are gonna take the head off an unknown engine then do it before you order a head gasket, chances are the base gasket won't be the same either. CHECK the gasket on your engine against the sellers pictures before buying a new one.

hoops
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Re: Right gasket set but different head gasket.

Postby hoops » Sun Dec 10, 2017 4:24 pm

i am doing the top end on my 1980 cb650 and the head gasket doesn't fit very good ( NE ) it will work but i don't like it and can't find a oem hora one posting.php?mode=reply&f=4&t=14167#:cry:

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GeorgeSweety
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Re: Right gasket set but different head gasket.

Postby GeorgeSweety » Sun Dec 10, 2017 6:01 pm

Hi hoops and welcome. As far as I was able to work out the differences between the gaskets is down to the carburetor types used on the engines. A cylinder head from a 79/80 engine with slide carbs won't fit on an 81/82 engine with CV carbs. I'm presuming (by my own theory :roll: ) that the gasket for your head should "resemble" the bottom gasket in my picture?

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GeorgeSweety
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Re: Right gasket set but different head gasket.

Postby GeorgeSweety » Sun Dec 10, 2017 6:24 pm


hoops
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Re: Right gasket set but different head gasket.

Postby hoops » Mon Dec 11, 2017 6:06 pm

what would be the best aftermarket one lol i don't really like the idea of getting a 30+ year old gasket

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GeorgeSweety
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Re: Right gasket set but different head gasket.

Postby GeorgeSweety » Tue Dec 12, 2017 3:01 am

hoops wrote:what would be the best aftermarket one lol i don't really like the idea of getting a 30+ year old gasket


Be sure to let us know when you find out :lol: You've already tried one aftermarket gasket and that doesn't fit properly :roll: . You don't want to use a 30+ year old gasket on a 30+ year old bike :lol: :lol: :lol: In that case I'd suggest you buy a newer bike :D .

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Folsoml
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Re: Right gasket set but different head gasket.

Postby Folsoml » Tue Dec 12, 2017 6:05 am

Have you tried your local Honda dealer (or this link)? They seem to be still available new.

https://www.partzilla.com/product/honda ... 3f9c91cbd0
Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,

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GeorgeSweety
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Re: Right gasket set but different head gasket.

Postby GeorgeSweety » Tue Dec 12, 2017 8:37 am

Folsoml wrote:Have you tried your local Honda dealer (or this link)? They seem to be still available new.

https://www.partzilla.com/product/honda ... 3f9c91cbd0


Folsoml, that link is for the base gasket :shock:

This is for the head gasket but they are unavailable
https://www.partzilla.com/catalog/honda ... inder-head

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Folsoml
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Re: Right gasket set but different head gasket.

Postby Folsoml » Tue Dec 12, 2017 7:16 pm

Image
Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,

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Folsoml
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Re: Right gasket set but different head gasket.

Postby Folsoml » Tue Dec 12, 2017 7:21 pm

Now why do you reckon they make the base gasket but not the head gasket? If you take the engine down far enough to get to the base gasket, you're gonna need a new head gasket.

Here's one. It say there is only one available, so hurry:

https://www.cmsnl.com/products/gasket-c ... jByDFWnG00
Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,


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