Exhaust Pipe Size gt650 carby

[Marius778]

Bike Model = : GT650

Hi everyone, glad to see you.
So my question is, what size is the exhaust pipe on the gt650 carby, right before the 3 bolt flange. I would want to cut it and install an adapter for 51mm. Because I think it’s a little bit bigger, somewhere I read that it is 54mm but I can’t trust it fully, and I can’t measure it my self because it’s in the garage for the winter, a bit far from where I’m at rn

[♠️ M77]

Depending where the pipe is cut,  the exhaust may even downsize to less than 51mm if its cut down too far.

So at the 3 bold flange , go inside the exhaust hole, get a vernier caliper  and measure the hole size   , if its something like 47mm,. then the exterior would be about 49mm (depends how thick the wall is.  Measuring the diameter outside is better if you can.

You are right to ask,  some 650 owners chop their pipes and put some kind of adapters (makeshift) or even make entirely custom pipe setup if the old system is corroded,

Measuring is the best way to be accurate  (and i will assume you still use OEM pipes)

Take your time,  no rush as we don’t ride much in this ice this week ourselves in the UK

[Marius778]

Welp i know it isnt smaller than 51

there are adapters un temu that are really easy to put, i just dont know the size, i thought maybe someone could know

[♠️ M77]

Get a venier caliper that has long arms and measure the external size where you want to cut it  (it could slop down from 56 to 50 the further down you go.)

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