Author Topic: Xs head on TX worth the trouble?  (Read 9460 times)

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Offline Wally

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Xs head on TX worth the trouble?
« on: August 05, 2014, 12:06:23 PM »
Well I have just about got the bottom end of my TX back together so it is time to think about replacing my damaged head. I have read a lot of the story's on here about people fitting the xs heads onto the tx engines but there doesn't seem to be many success stories. So my question is, is it really worth it? I have heard people say with modern oils the head cracking issues can be resolved and isn't there remedies In place for the oil leaks as well? At least I know everything is going to fit with the 2 piece...

Offline Wally

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Re: Xs head on TX worth the trouble?
« Reply #1 on: August 05, 2014, 12:34:01 PM »
Just realised I posted this in the wrong section....

Offline CrouchyUK

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Re: Xs head on TX worth the trouble?
« Reply #2 on: August 05, 2014, 01:15:13 PM »
I moved it for you Wally.....
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 Wally

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Re: Xs head on TX worth the trouble?
« Reply #3 on: August 05, 2014, 09:46:25 PM »
Cheers Crouchy

Offline dean

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Re: Xs head on TX worth the trouble?
« Reply #4 on: August 06, 2014, 12:57:07 PM »
If I were choosing between a couple of rebuilt heads, both in perfect condition, I would install the later style head. Remember there is the oval vs. round head pipe change too.

Offline Wally

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Re: Xs head on TX worth the trouble?
« Reply #5 on: August 06, 2014, 09:58:09 PM »
Just sounds like a bit of a gamble with the later model heads on the TX, with the cams sometimes fitting straight up and other times needing to be replaced. The header pipes aren't an issue as I need to replace them anyway.

Offline guylr

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Re: Xs head on TX worth the trouble?
« Reply #6 on: August 06, 2014, 10:51:39 PM »
It's still worth it even if you current cams won't fit (they probably will). The top end is less leak prone and a bit stronger so they crack less in the combustion chambers.

Guy
Now Retired Yamaha guy. Cut me and I bleed "Cinquasia Red"

Offline Wally

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Re: Xs head on TX worth the trouble?
« Reply #7 on: August 07, 2014, 01:07:11 AM »
Thanks , I think you have both made the decision for me. Now I just have to track down a head.

Offline Wally

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Re: Xs head on TX worth the trouble?
« Reply #8 on: August 07, 2014, 11:57:15 AM »
Does the cylinder housing/jugs have to be replaced to fit the Xs head? I just noticed the TX and Xs have different part numbers?

Offline guylr

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Re: Xs head on TX worth the trouble?
« Reply #9 on: August 07, 2014, 06:48:46 PM »
No, the original cylinders will work fine. While it's down if you need to change pistons try to find a set of 2F1 pistons from the XS500E models. They have a slightly higher dome and will boost the compression ratio from 8.5;1 up to 9.6:1 and give you a bit more torque. They pop up all the time on eBay here in the US.

Guy
Now Retired Yamaha guy. Cut me and I bleed "Cinquasia Red"

Offline Wally

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Re: Xs head on TX worth the trouble?
« Reply #10 on: August 07, 2014, 09:51:19 PM »
Thanks for the advice, I will keep my eye out for a pair of those

Offline Nat

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Re: Xs head on TX worth the trouble?
« Reply #11 on: August 08, 2014, 01:20:52 PM »
Hi Wally

I've got a xs500 head.
PM me if you are interested, can send more photos. I am in Perth.
« Last Edit: August 08, 2014, 01:25:47 PM by Nat »
1973 TX500
Moto Guzzi Breva 750

Offline Wally

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Re: Xs head on TX worth the trouble?
« Reply #12 on: August 09, 2014, 01:45:50 PM »
Seems like the later Xs heads with the round ports are a little hard to come across. I found one website listing a brand new head with this part number 1A8-11111-01-00. Is that the later head?

Offline guylr

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Re: Xs head on TX worth the trouble?
« Reply #13 on: August 09, 2014, 06:22:05 PM »
That is a one piece head. Don't hold me to this but it is probably also the round port too. I'll have to dig up my 1976-78 parts bulletins to be sure though. Can any of our Canadians confirm that? The replacement oval port US model part number is 1A8-11111-09. Either way a new one piece head is a good thing so snap it up if the price is reasonable.

Guy
Now Retired Yamaha guy. Cut me and I bleed "Cinquasia Red"

Offline CrouchyUK

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Re: Xs head on TX worth the trouble?
« Reply #14 on: August 09, 2014, 06:48:35 PM »
78 European Parts Book shows the 1A8-11111-01 part number for the head.  As the same parts book is showing the engine with the 2F1 high comp pistons then the head would definitely be round port....
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