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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Mon Apr 17, 2017 9:19 pm 
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Moto GP
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Joined: Fri Oct 24, 2008 5:55 pm
Posts: 3908
Location: Lancaster Pa.
Country: US
Bikes owned: GT750 x2 97 -1200 Bandit 86 GSXR1100
Somethings wrong then as it shouldnt leak around the M8 head bolts .

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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Tue Apr 18, 2017 12:34 am 
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Moto GP
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 5750
Location: Illinois
Unless it's that stud with a nut on it close to the thermostat housing....... :?

On some barrels, that stud thread is open at the bottom to water and it will leak past the threads.


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 Post subject: Re: BIMOTA GT1 Proje
PostPosted: Tue Apr 18, 2017 6:01 am 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 57
Country: Austria
Bikes owned: GT750
It is actually the M8 bolt between cyl #1 and #2. I noticed it jad been helicoiled by the PO, and now I assume he had drilled a bit too deep and that thread now is open to the water pocket below. That would explain why the thread of this bolt was wet with coolant when I removed it.

Can anyone confirm if there is a water pocket below the thread of this bolt in the middle of the head, between cyl #1 and #2?


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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Tue Apr 18, 2017 8:02 am 
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Moto GP
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 5750
Location: Illinois
Yes, that one will open into the water passage if it is drilled through. That should have a stud in it and not a bolt.

It might be better to drain the block and dry it and use epoxy to seal the bottom of that hole. You will have to create a bund or cover from tape or similar to hold it in place as it dries.

Or maybe try teflon tape around the threads to fill the gap

Or Three bond around the threads and under the head of that bolt, with a copper washer to help to seal it.


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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Tue Apr 18, 2017 11:43 am 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 57
Country: Austria
Bikes owned: GT750
This is the location of the leaking bolt and yes, the thread is definitely open to the coolant pocket. Easy fix!

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