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#714366 - 11/09/17 11:45 am tribsa alloy 8 stud pre-unit head  
Joined: Nov 2011
Posts: 121
yosemite Offline
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yosemite  Offline
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Joined: Nov 2011
Posts: 121
kelso scotland
Hi
About to start rebuilding the Tribsa engine, but the head needs sorting, usual cracks and the threads in the exhaust ports are not really useable, apart from filling the ports with weld and recutting the threads in a milling machine,apart from this, so far I have thought about about using alluminium brazing rods, and simply filling around the stub, (but not sure the repair will survie the temperature when the engine is run.) or simply boring the port and using a push in stub.
Any suggestions as this bike is a tribsa not really bothered about originality but any repair must be durable
To fix the cracks was going to ream the holes and make a couple of steel hollow dowels to press in
Yosemite

#714668 - 11/11/17 9:32 pm Re: tribsa alloy 8 stud pre-unit head [Re: yosemite]  
Joined: Nov 2009
Posts: 571
bon Online content
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bon  Online Content
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Joined: Nov 2009
Posts: 571
If you go onto "gordy's goodworks" on youtube, you will see how he does it. If it were me i'd bore out the ports and weld in a fresh piece of aluminium and recut the threads.

#714848 - 11/13/17 1:06 am Re: tribsa alloy 8 stud pre-unit head [Re: yosemite]  
Joined: Aug 2012
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bryan johnson Offline
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bryan johnson  Offline
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Joined: Aug 2012
Posts: 114
AR
have you thought about just using this as an excuse to switch to a 9 stud unit construction top end?

#715005 - 11/14/17 10:25 am Re: tribsa alloy 8 stud pre-unit head [Re: bryan johnson]  
Joined: Nov 2011
Posts: 121
yosemite Offline
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yosemite  Offline
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Joined: Nov 2011
Posts: 121
kelso scotland
Originally Posted by bryan johnson
have you thought about just using this as an excuse to switch to a 9 stud unit construction top end?

thought about it , still thinking but would need 9 stud barrels,and would probably end up putting a big bore kit on it, high comp pistons.......

#715210 - 11/15/17 2:51 pm Re: tribsa alloy 8 stud pre-unit head [Re: yosemite]  
Joined: Aug 2012
Posts: 114
bryan johnson Offline
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bryan johnson  Offline
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Posts: 114
AR
It is a slippery slope...

#715227 - 11/15/17 5:21 pm Re: tribsa alloy 8 stud pre-unit head [Re: bryan johnson]  
Joined: Nov 2011
Posts: 121
yosemite Offline
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yosemite  Offline
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Joined: Nov 2011
Posts: 121
kelso scotland
Originally Posted by bryan johnson
It is a slippery slope...

maybe nows the time to take up a new hobby.......skiing

Last edited by yosemite; 11/15/17 6:35 pm.


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