Suzuki t500 1975 carburettor

[Monkey man]

Good evening everyone

Can anyone recommend a supplier of carburettor replacement parts for my Suzuki t500m and what size main jets and pilot air screws are needed . There’s a lot of conflicting information out there and I’m unsure what to buy

Thanks

[Alan H]

https://www.oldjapanesebikes.com/mraxl_ ... s/page-109
Lots of info here.

[jabcb]

Suzuki used two very different types of carbs on the T500.

Fuel flow is driven by the pressure difference between the float bowl and the air flow through the venturi.
Early T500 carbs have internally vented float bowls. They are vented via a carb body passage.
Late T500 & GT500 carbs have normally vented float bowls. They are vented via a brass tube in the float bowls.
The brass tube float bowl vent is the easiest way to tell which type of carb you have.

The carbs have a 5 digit number stamped on them. It’s the second part of the carb part #.
The ’75 T500 carb part #s are: 1320X—15313. (X = 1 for right & 2 for left) The ’75 carbs are stamped 15313.

See pics of GT500 carbs: https://www.ebay.com/itm/176211490457

The venting has a really big impact on carb jetting.
There was much confusion about correct jetting — Suzuki issued service bulletins for jetting for each model year.
Those service bulletins are here: http://www.ozebook.com/compendium/techbuls/

[jabcb]

If you are still unsure or would rather have a pro do the work, send your carbs to Barry Wilkes. eBay seller bluesmokebaz & located in the UK.
He's a GT750 restoration expert & does a nice job at restoring carbs.

[Monkey man]

Thanks guys for the information- really useful but I didn’t find what size pilot and main jet sizes are recommended

I did identify that i have the later mikuni carbs so thats a good start