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huit
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Post subject: Re: Pantah project  Posted: Sun Aug 10, 2025 8:54 am |
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Joined: Sat Oct 29, 2011 3:38 pm
Posts: 938
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Thanks Mike, seems someone says green intake then other black? There is a black one know so I will just replace! I ordered some yesterday 
Last edited by huit on Sun Aug 10, 2025 4:07 pm, edited 1 time in total.
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618F1
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Post subject: Re: Pantah project Posted: Sun Aug 10, 2025 9:59 am |
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 2093
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Yeah, green to exhaust, black to intake. But once they were all black. Maybe just new works. MikeV
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huit
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Post subject: Re: Pantah project Posted: Sat Aug 16, 2025 11:01 am |
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Joined: Sat Oct 29, 2011 3:38 pm
Posts: 938
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After more investigation I decided to drop the motor yesterday, pulled the vertical head off this morning and took it apart, intake seal had a pretty good cut in it( blame it on the builder  Valve guides are ok, debating if I should get new ones installed and lost the originals.
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618F1
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Post subject: Re: Pantah project Posted: Sat Aug 16, 2025 3:08 pm |
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 2093
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Gosh Paul. You found what seems to be the [obvious] problem. Why do just one guide? And if it is good. Or just one of the heads? Besides, new guides mean grinding the seats again! And re-shimming. And maybe touching the valves. And, and, and..... A little bit less on everything left after. Lazy MikeV
PS: Might have to re-dial the cams too!
See those little triangular flashings hanging inside up top near the upper bolt holes - i grind those off every head i get near. Been sliced and diced too many times.
I see you said “guides”. My bad. But still….
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huit
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Post subject: Re: Pantah project Posted: Sat Aug 16, 2025 3:56 pm |
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Joined: Sat Oct 29, 2011 3:38 pm
Posts: 938
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Mike, the horizontal head is apart as well now, the intake valve had a hot spot on it so both heads are now getting new guides as well as seats, the valves are sunken in quite a bit, I don’t have any history on the motor. I have time  Paul
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618F1
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Post subject: Re: Pantah project Posted: Sat Aug 16, 2025 4:02 pm |
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 2093
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Ok. Sounds justified now. Time, and money, will fix a lot. MikeV
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583
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Post subject: Re: Pantah project Posted: Sat Aug 30, 2025 5:32 am |
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Joined: Wed Aug 27, 2014 3:36 pm
Posts: 417
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Hi Paul
i'm sorry to see what appened to your engine. Hope you sort it up shortly.
your bike is very ispirational for me and i would like to ask :
what about your triple trhee. Is it stock, modified to fit the 38 mm Marzocchi fork? or what?
Thank you for sharing
Filippo
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huit
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Post subject: Re: Pantah project Posted: Sat Aug 30, 2025 11:47 am |
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Joined: Sat Oct 29, 2011 3:38 pm
Posts: 938
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Filippo,
No modifications were required to the triple clamps, the heads should be back next week from having new valve guide installed and the intake ports matched to the intakes.
Paul
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huit
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Post subject: Re: Pantah project Posted: Mon Sep 08, 2025 3:18 pm |
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Joined: Sat Oct 29, 2011 3:38 pm
Posts: 938
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Heads arrived at the end of last week, both exhaust valves were replaced, new guides installed, seats cleaned up and intake ports cleaned up and matched to the manifolds.
Not sure what caused the issue with the exhaust valves, all good now!
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