GT550 Fuel tap.

General discussion about Street two-stroke Suzuki motorcycles.

Moderators: oldjapanesebikes, H2RICK, diamondj, Suzsmokeyallan

Post Reply
Stevo58
On the street
Posts: 24
Joined: Tue Feb 25, 2025 2:11 pm
Country: United Kingdom
Suzuki 2-Strokes: GT550 - 1976

GT550 Fuel tap.

Post by Stevo58 »

Hi out there,
Was hoping for a test ride today, but the pet cock is leaking from the little hole in the back, which I think may mean the vacuum diaphram is leaking?

Do any of you guys know the part number, or where to get a refurb kit?

Had a look on Ebay, and there are some similar diaphrams (the GS550 looks similar) but dont want to buy the wrong kit. I can buy a complete tap, but would rather keep it original if I can.

Kind Regards

Steve
User avatar
jabcb
Moto GP
Posts: 4314
Joined: Mon Dec 13, 2010 4:32 pm
Country: USA
Suzuki 2-Strokes: 69 T350 thru 75 GT750
Location: southwestern Pennsylvania

Re: GT550 Fuel tap.

Post by jabcb »

A German company sells petcock parts:
https://hard-to-find-parts.de/epages/af ... hn_Auspuff

An alternative is to do a manual petcock conversion.
My topic for an early GT550 petcock:
http://www.suzuki2strokes.com/forum/vie ... 30#p177630

Make sure to map out the flow paths to figure out which ones to plug. Your late GT550 petcock may differ.

Also useful to use paint to mark off. Useful as reminder the petcock is manual.
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Stevo58
On the street
Posts: 24
Joined: Tue Feb 25, 2025 2:11 pm
Country: United Kingdom
Suzuki 2-Strokes: GT550 - 1976

Re: GT550 Fuel tap.

Post by Stevo58 »

Thanks Jabcb,
I had thought of blanking off the tap vacuum - will have a look at this if I cant get the part. I have done some research and the Yamaha XS100 seems to have had a 36mm diaphram on its tap - just waiting for confirmation from the supplier. (https://www.ebay.co.uk/itm/323694220318)

Downside is from China.......

All the Best and Thanks for the advice and info

Steve
Post Reply