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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: 3972
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: 5941
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: 82
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: 5941
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: 82
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: 82
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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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2107
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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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Sat Dec 23, 2017 1:16 pm 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 82
Country: Austria
Bikes owned: GT750
Here is an update after a while. Picked up bodywork from the painters yesterday - exactly as I expected it. I had already installed a set of JEMCOs, but they are way too loud for use on public roads on my side of the globe. So I ordered a second set, without silencers, and will put on my own larger diameter and 2 inches longer silencers with different internals (diffusion and absorption portion) as well as an internal stinger into the belly.
Also need to fix an issue with my electronic regulator/rectifier - voltage goes up to 15,7V max which will kill the LiFePo4 battery I am afraid. Dont understand why this brandnew regulator behaves like this - may try the old original mechanical one.

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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Sat Dec 23, 2017 2:34 pm 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2107
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
The usual cause of high charging voltage is low voltage at the regulator. Usually caused by a bad connection between battery and reg on the feed (control) side or even a poor earth on the reg will have the same effect. That makes the reg 'think' that the battery voltage is low, so it tries to put more into it to bring the voltage up to 14.2 ish. If you can't get this sorted easily or you are using a new 'thin wire' harness, run a fused wire direct from the battery + to the regulator via a relay that switches when the ignition is turned on and off.


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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Tue Dec 26, 2017 3:31 pm 
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Yeah Man, the Interstate

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 668
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
OMFG. I think i just had an orgasm! That bike looks super gorgeous. I don't think I've ever been this jealous before. That is probably the sexiest replica I have ever had the pleasure of seeing. :up: :clap: What does it ride like?


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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Dec 27, 2017 3:02 am 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 82
Country: Austria
Bikes owned: GT750
sportston wrote:
OMFG. I think i just had an orgasm! That bike looks super gorgeous. I don't think I've ever been this jealous before. That is probably the sexiest replica I have ever had the pleasure of seeing. :up: :clap: What does it ride like?


Hello Sportston,
It is not ready to ride yet, it is just a quick mock-up after I got the bodyparts from the paintshop. I am thinking of having the tank coated with some sealer (?) - it is an epoxy tank, I need to finish some electrics, and have bungs welded into the headers of the pipes for EGT sensors. Also planning to have both sets of exhausts ceramic coated in satin black.
The bike should roughly be 30kg lighter than stock, more weight could be saved with VM 5-spoke wheels which look exactly like the CAMPAGNOLOs of that period. I currently use KAWASAKI Z1000 wheels which weigh a ton each....

I won´t ride this bike a lot, there is no way I can get it street legal here in Austria. It will be reduced to some bike meetings on race tracks, or some short rides on hidden roads in the middle of nowhere.

I am very touched about the great feedback I am receiving from everywhere. This is not my first project bike, I have done some other two stroke customs already and few full restorations. I have a bone stock GT750A as well which I restored in 1999.

Here are some more pics:

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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Dec 27, 2017 12:28 pm 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 82
Country: Austria
Bikes owned: GT750
Alan H wrote:
The usual cause of high charging voltage is low voltage at the regulator. Usually caused by a bad connection between battery and reg on the feed (control) side or even a poor earth on the reg will have the same effect. That makes the reg 'think' that the battery voltage is low, so it tries to put more into it to bring the voltage up to 14.2 ish. If you can't get this sorted easily or you are using a new 'thin wire' harness, run a fused wire direct from the battery + to the regulator via a relay that switches when the ignition is turned on and off.


Hi Alan,
thanks for your advice. I actually paid attention to that when I designed the wiring loom. My ignition switch is very close to the battery and the regulator to keep distances as short as possible. I measured the voltages today - I had 12,98V directly at the battery and 12,85V on the orange feed control wire going into the regulator. I dont think this causes the problem, I rather think the regulator itself is adjusted poorly. I will try another one.


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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Thu Dec 28, 2017 5:33 am 
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AMA Superbike
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Joined: Tue Oct 14, 2008 6:47 pm
Posts: 1721
Location: Blythewood, SC, USA
WE ARE NOT WORTHY!!!!!! AWESOME. I hope you don't have a problem with exhaust cracking as they are mounted. Everything look fantastic.



Lane

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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Thu Dec 28, 2017 12:22 pm 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 82
Country: Austria
Bikes owned: GT750
rngdng wrote:
WE ARE NOT WORTHY!!!!!! AWESOME. I hope you don't have a problem with exhaust cracking as they are mounted. Everything look fantastic.



Lane


Hi Lane, thanks for the nice feedback. I am aware of the potential risk of exhaust cracking, I will do my best to add sufficient flex in the rear rubber mounts. I just cant stand those ever oil leaking spring mounted race pipes, it is just not adequate for this project. It needs to be clean.


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 Post subject: Re: BIMOTA GT1 Project
PostPosted: Fri Dec 29, 2017 12:06 pm 
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Yeah Man, the Interstate

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 668
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
wolfgangh wrote:
I just cant stand those ever oil leaking spring mounted race pipes, it is just not adequate for this project. It needs to be clean.

Here, here! I find it hard to understand how you can get consistent back pressure when they are always leaking.
I am quite concerned that you won't be able to ride the bike on the road in Austria. Have you considered putting your baby up for a foreign adoption?
It wouldn't be too difficult to get it road registered in the UK..... :up: if you required financial recompense I could always sell my wife or rob a bank. :ssh:


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