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 Post subject: Thermostat repair
PostPosted: Tue Mar 06, 2018 5:01 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5426
Location: southern Germany
model: 750 Paso
year: 1987
Nigel H. posted the following on FB and gave the permission to copy it in the forum.

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Cooling issue update...turns out a broken thermostat, where the pin is held by a plastic bridge was broken. Thermostat sticking, opens a bit . But not a lot, so bike temp at 100c.
Purchased a second hand Aprilia thermostat after reading post from paso site. I looked at how to sort out hose size difference and angle, Aprilia in take is straight, where 907 is a right angle. So decide to take apart collar around thermostat and swap over the right angle piece from 907 thermostat to Aprilia thermostat. Slow process to bend up collar, 907 thermostat pops out and not found for days!!! No matter as I silicone and re attach collar. No leaks after 300km, temp at 85 while riding at 100kmh in 35c heat. I fitted a new Spal 5" fan as well. Temp gets no higher than 95c in traffic on 35c day. I think it a success. Best part is I still use Samco silicone hoses, looks original and no need for reducer hoses etc. I will still carry a spare on up coming 3000km Tasmania trip and hoses etc just in case my fix fails. I buy last and only Aprilia thermostat left in Australia ( yes seriously) and order another so I can make another spare.

Working perfectly I think, though one day in cold rain temp dropped to 60c. I felt thermostat should've kept it at 75c.


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 Post subject: Re: Thermostat repair
PostPosted: Tue Mar 06, 2018 10:38 pm 
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paso grand pooh-bah

Joined: Thu Jun 21, 2007 12:00 am
Posts: 1495
Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
Thx f sharing, FAQ material.

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 Post subject: Re: Thermostat repair
PostPosted: Wed Mar 07, 2018 10:45 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5426
Location: southern Germany
model: 750 Paso
year: 1987
It is in the FAQs now. I posted here because many wouldn't have seen it.


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 Post subject: Re: Thermostat repair
PostPosted: Thu Mar 08, 2018 1:59 pm 
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paso grand pooh-bah
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Joined: Mon Jul 26, 2004 12:00 am
Posts: 3073
Location: Finland
VERY GOOD job, Gerhard :thumbup: :thumbup: :thumbup:

Ps. I still WONDER, that You have sooooo.... much time to be in internet with thesekind of things? :mrgreen:

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 Post subject: Re: Thermostat repair
PostPosted: Tue Dec 01, 2020 3:17 am 
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Joined: Fri Jul 25, 2014 10:23 am
Posts: 24
Location: Canberra, Australia
model: 907 I.E.
year: 1992
Just chiming in to say that I replaced my failed thermostat over a year and 3k+ km ago using the method described in the OP. A new ST2 t'stat was the donor.
No silcone used on reassembly, the new O-ring from the donor and some care peening down the clamping ring was all that was necessary. Works a treat and no bodges required.


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 Post subject: Re: Thermostat repair
PostPosted: Fri Dec 04, 2020 10:45 am 
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Joined: Tue Sep 15, 2009 4:08 am
Posts: 222
Location: Melbourne Vic, Australia
model: 907 I.E.
year: 1991
Glad my idea is still working...always a risk!
Cheers nigel

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