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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: 3969
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: 5809
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: 60
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: 5809
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: 60
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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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Sun Jun 25, 2017 1:19 pm 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 60
Country: Austria
Bikes owned: GT750
few new pictures - I have welded solid flanges to the JEMCO headers to stop the oil leaking; I have ordered another set of JEMCOs - without the integrated silencers - and will build my own silencers onto it, with 70mm diameter and 50mm longer, and the stinger pipe into the reflector. I hope to get noise down a bit with these modifications.

Note the syringe, which acts as my provisional oil tank, and the former coolant reservoir fixed to the steering head as my tank...

What do you think about the mirrors - are they too short, do you think longer ones would look better?

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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Mon Jun 26, 2017 3:38 pm 
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AMA Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 1916
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
Looking good.
If you think the mirrors are ok, then they're ok.
Just make sure they are useful for seeing behind you and not just your elbows!
Personally, I like bar end mirrors on low/flat bars, but not everyone else does.


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