Author Topic: My TX500 cafe project  (Read 8738 times)

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Offline deadpresident

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Re: My TX500 cafe project
« Reply #15 on: November 18, 2012, 09:26:14 PM »
It turns out my manual was a misprint. I looked online for a Yamaha manual, and yes, I was about to time my engine wrong. Good onya crouchyuk!

Offline deadpresident

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Re: My TX500 cafe project
« Reply #16 on: November 18, 2012, 09:28:05 PM »
Alright, a question for the experts: I picked up an XS500 head gasket off eBay. It does not have the two little holes in between the cylinders that are on the head and cylinder block on my TX. I assume the later models with the one-piece head didn't  need them, but i want to be sure before final assembly. They look like they might be oil drains for the cam box. Help?

Offline CrouchyUK

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Re: My TX500 cafe project
« Reply #17 on: November 18, 2012, 09:28:45 PM »
Alright, a question for the experts: I picked up an XS500 head gasket off eBay. It does not have the two little holes in between the cylinders that are on the head and cylinder block on my TX. I assume the later models with the one-piece head didn't  need them, but i want to be sure before final assembly. They look like they might be oil drains for the cam box. Help?

They're not oil drains, they are external to the engine.  But they do drain the "well" in the middle of the TX head of any water.  If you look at your head you will see the 2 holes run straight through the head- through the original gasket, then down between the barrels and into the space between the fins.  Separate to this but the same idea- if you look at the barrels, there is another void between them that drains out through the middle of the base gasket and out the front of the crankcase.  That's why the base gasket has that hole in the middle as well.

You are right in that the 1 piece head doesn't have them- that area of the top of the head is built up with some chunky cooling fins on.  No well. So the later gasket doesn't have the holes either.

Losing these little drain holes isn't such a big thing, but personally I would punch them back into the gasket if it were my bike.  And of course prove them clear in the head and barrels.  The reason is that the small amount of air the top scoop can blow down through there can do nothing but help the cooling of a very hot area.  And of course you still get the drainage.

If you have the later gasket, I assume you also have the rectangular metal/rubber cam area sealing gasket as well?  I would hate to miss that off...

1975 Honda CB200T (2) - 1975 Yamaha XS500B (2) - 1976 Yamaha XS500C
1977 Yamaha RD400D - 1977 Yamaha XS500D - 1978 Honda CB550K - 1980 Honda CB400N
1980 Honda CB900FA - 2000 Kawasaki ZX6-RG2 - 2002 Suzuki GSX-R1000K2

Offline deadpresident

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Re: My TX500 cafe project
« Reply #18 on: November 18, 2012, 09:29:11 PM »
I don't know what you mean... Do you mean a separate gasket for the camchain tunnel? Or a later version of the gasket between the head and cam box? My head gasket has a seal for the camchain tunnel, so I assume you mean the cambox. Mine is the original TX style fiber gasket. Thanks for the info on the head gasket- I took a look at the head, and yes, the holes are open to atmosphere at the top. Surprised I didn't notice earlier. I went ahead and punched holes in the gasket.

Offline CrouchyUK

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Re: My TX500 cafe project
« Reply #19 on: November 18, 2012, 09:29:34 PM »
Yes, I meant the separate metal/rubber gasket that fits inside the later gasket and seals the camchain tunnel.  For Yamaha this was a separate part to the main gasket- 1A8-11357-00.  So it depends on whether you have a Yamaha part or a pattern version, maybe the pattern ones come with it.  Maybe they also come with the oil seals 1A8-11358-01 which again Yamaha had as a seperate part.

For the cambox to head gasket  the later 3 piece gasket with the steel/copper insert they brought out in October 74 I think is a better idea?  Although Yamaha stated on the Service Bulletin it was only for those engines with oil leakage problems, i would fit it anyway.  I suspect they quietly fitted it to all the later TX500A's and XS500B's at the factory anyway- both my B's have this type.  I am convinced a metal joint at the front of the engines also helped the heat get away from those hot exhausts in the thin sliver of a head......

1975 Honda CB200T (2) - 1975 Yamaha XS500B (2) - 1976 Yamaha XS500C
1977 Yamaha RD400D - 1977 Yamaha XS500D - 1978 Honda CB550K - 1980 Honda CB400N
1980 Honda CB900FA - 2000 Kawasaki ZX6-RG2 - 2002 Suzuki GSX-R1000K2

Offline deadpresident

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Re: My TX500 cafe project
« Reply #20 on: November 18, 2012, 09:29:59 PM »
Huh. I had no idea such a thing exists. The head gasket I have is obviously not a Yamaha original part, and it definitely seals around the cam chain tunnel, but I am looking into the rubber and metal seal you mention before I button her up, just in case. As far as the cam box gasket, I wouldn't have bought the one I have if I'd known there was an alternative. I'll look into that, too. Thanks!

Offline CrouchyUK

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Re: My TX500 cafe project
« Reply #21 on: November 18, 2012, 09:30:35 PM »
Huh. I had no idea such a thing exists. The head gasket I have is obviously not a Yamaha original part, and it definitely seals around the cam chain tunnel, but I am looking into the rubber and metal seal you mention before I button her up, just in case. As far as the cam box gasket, I wouldn't have bought the one I have if I'd known there was an alternative. I'll look into that, too. Thanks!

Sorry- I seem to be raining on your parade when you want to make progress!

Good picture here from a supplier that realises you need both:-

http://www.ebay.co.uk/itm/YAMAHA-XS500-TX500-Head-Gasket-Kit-2F1-11181-10-00-NEW-FREE-SHIPPING-/110966882638?pt=Motors_ATV_Parts_Accessories&hash=item19d624414e

And the newer cambox gasket looks like this:-

http://www.ebay.co.uk/itm/NOS-Yamaha-Head-Cover-Gasket-1975-XS500-371-00000-95-/200289541373?pt=Motorcycles_Parts_Accessories&hash=item2ea22fdcfd

1975 Honda CB200T (2) - 1975 Yamaha XS500B (2) - 1976 Yamaha XS500C
1977 Yamaha RD400D - 1977 Yamaha XS500D - 1978 Honda CB550K - 1980 Honda CB400N
1980 Honda CB900FA - 2000 Kawasaki ZX6-RG2 - 2002 Suzuki GSX-R1000K2

Offline deadpresident

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Re: My TX500 cafe project
« Reply #22 on: November 18, 2012, 09:31:01 PM »
Well, I'll not going to bother with the metal cambox gasket, since I already have the fiber one, and the old one didn't leak, but I am going to pick up that gasket for the camchain tunnel- I found a supplier that sells them separate. Good onya for giving me the info!

Offline deadpresident

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Re: My TX500 cafe project
« Reply #23 on: July 17, 2014, 02:15:14 AM »
Looooong time since my last update... Sorry if anyone was in suspense! I have finally gotten te bike fired up, though in need of tuning badly she sounds strong and crisp. One thing I'm having an issue with, though , is leaky petcocks.... I can't afford the new Pingel conversions... But has anyone else done a rebuild on the original parts? Good luck with it?

Offline deadpresident

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Re: My TX500 cafe project
« Reply #24 on: January 29, 2015, 03:15:42 AM »
Just a quick downer.... I haven't posted in a while because the first long ride I took the bike on, the motor locked up on me.
For the record, I'm the guy in the gulf shirt. Big Man is my best friend Jake.
 No worries, Deanj has come to the rescue with a nice 78 bottom end, I just haven't had time to do the swap, what with the new baby on the way and all....
« Last Edit: January 29, 2015, 03:23:15 AM by deadpresident »