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PostPosted: Mon Nov 20, 2017 10:26 pm 
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On the street
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Joined: Sun Dec 18, 2016 6:15 pm
Posts: 17
Location: Northern British Columbia
Country: Canada
Bikes owned: 72 GT750, 74 GT750, 75 T500, 09 DR650
Does anybody know what the Suzuki part number is for the petrol tap diaphragm assembly? The Suzuki parts book doesn't show this diaphragm side of the petrol tap disassembled (so no part number).

Olaf


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PostPosted: Tue Nov 21, 2017 5:16 am 
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AMA Superbike
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Joined: Tue Oct 14, 2008 6:47 pm
Posts: 1723
Location: Blythewood, SC, USA
I've never seen one for sale. Just buy a new petcock.

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If you stroke it more than twice; you're playing with it.

Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........


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PostPosted: Tue Nov 21, 2017 6:13 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3243
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
A little shop in Germany sells newly manufactured diaphragms. (Use Google translate for English translation.)
https://hard-to-find-parts.de/epages/aff9fb37-1c0b-4b3c-8be3-a10a53d7f9b8.sf/de_DE/?ObjectPath=/Shops/aff9fb37-1c0b-4b3c-8be3-a10a53d7f9b8/Categories/SUZUKI/Luftfilter_Vergaser_Benzinhahn_Auspuff

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BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Wed Nov 22, 2017 5:22 am 
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Location: Blythewood, SC, USA
Not cheap!!! New MAB exhaust system! Really not cheap!!!!

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If you stroke it more than twice; you're playing with it.

Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........


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PostPosted: Wed Nov 22, 2017 6:32 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3243
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
rngdng wrote:
Not cheap!!! New MAB exhaust system! Really not cheap!!!!

I have an original parts manual for my 1969 T350. Was used by a dealership and has the prices penciled in.
From that perspective most parts have gotten really expensive.

But just price out the corresponding parts for a new bike.
Was curious so I just took a look at a dealership website & priced out an exhaust system for a 2013 Honda CB1100.
The 4-into-1 header is $1,773. The muffler is $896.

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Wed Nov 22, 2017 7:22 am 
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Road race school

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 814
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
rngdng wrote:
Not cheap!!! New MAB exhaust system! Really not cheap!!!!

Welcome to world of classic 2-strokes. You either need to be rich or capable of compromise and ingenuity. New genuine parts cost one arm and two legs, whilst aftermarket parts only cost an arm and one leg.
If you are obsessed with originality it will seriously deplete your coffers. If you just want to make your bike usable, but not standard you can save a lot of pennies. If your crankshaft needs rebuilding, its time to start spending the kids inheritance. :lol:


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PostPosted: Wed Nov 22, 2017 12:39 pm 
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To the on ramp

Joined: Fri Aug 11, 2017 7:09 am
Posts: 277
Country: england
Bikes owned: several gt250 ramairs
get a 200mm x 200mm square of 0.3mm thick and make your own - i do :D
cheers, dd.
https://www.ebay.co.uk/itm/Nitrile-Nylo ... c_j9zWgw3A

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GTS250 road registered. TS250 engine, Ramair frame.
GT250 big bang road registered. Both pistons fire the same time. USD forks.
GT285 road registered. Overbored - 58mm and TS125 +2 pistons fitted.
GT10 road registered. '65 T10 engine, GT250 frame.


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PostPosted: Thu Nov 23, 2017 12:20 am 
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On the street
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Joined: Sun Dec 18, 2016 6:15 pm
Posts: 17
Location: Northern British Columbia
Country: Canada
Bikes owned: 72 GT750, 74 GT750, 75 T500, 09 DR650
Thanks DD and jabcb. The German hard-to-find-parts.de was good enough to include a detailed photo of a disassembled diaphragm assembly. Based on this it doen't look too difficult to 'rebuild' my old diaphragm assembly with nitrile sheet. I'll post some photos when I get to it.

Olaf


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PostPosted: Fri Nov 24, 2017 6:53 am 
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To the on ramp

Joined: Sat Jun 28, 2014 1:22 am
Posts: 224
Country: United Kingdom
Bikes owned: T500_MKIII
Unless your particularly interested in retaining the vacuum on/off you can modify the petcock to be off - reserve - on so the diaphragm becomes redundant. This is the route I took retain OEM look but converted to manual operation.

See:
http://www.suzuki2strokes.com/forum/viewtopic.php?f=9&t=12452

I thought I had a post with pictures, if I can find it I ll post a link to that as well.


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PostPosted: Fri Nov 24, 2017 4:28 pm 
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On the main road
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Joined: Thu Oct 03, 2013 4:39 am
Posts: 140
Country: Germany
Bikes owned: GT250/380
Olafskii wrote:
... Based on this it doen't look too difficult to 'rebuild' my old diaphragm assembly with nitrile sheet...
I did it that way.

http://suzuki-gt250.de/motornavi/motor.php?b=8&m=M1

https://translate.google.de/translate?sl=de&tl=en&js=y&prev=_t&hl=de&ie=UTF-8&u=http%3A%2F%2Fsuzuki-gt250.de%2Fmotornavi%2Fmotor.php%3Fb%3D8%26m%3DM1&edit-text=&act=url

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http://suzuki-gt250.de


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PostPosted: Sat Nov 25, 2017 6:57 am 
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To the on ramp

Joined: Fri Aug 11, 2017 7:09 am
Posts: 277
Country: england
Bikes owned: several gt250 ramairs
a word of warning though, olaf. always punch the holes out before cutting the outline out. holes are close to the edge and it's very easy to split. then you start again :D when making any gaskets, such as clutch cover etc, i always punch the holes out first, making sure there's plenty of gasket either side of the hole. hollow bore punch set is perfect and sit the gasket on a nice thick piece of hardwood. a good light source over the top of you helps when centreing the punch over the holes.
cheers, dd.

_________________
GTS250 road registered. TS250 engine, Ramair frame.
GT250 big bang road registered. Both pistons fire the same time. USD forks.
GT285 road registered. Overbored - 58mm and TS125 +2 pistons fitted.
GT10 road registered. '65 T10 engine, GT250 frame.


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