Reply To: Exhaust rot removal help Gt125r 2016
You could try this. Plenty of WD40 on the rusty fixings and leave it to soak in overnight. Use a hacksaw to cut through the rusty exhaust close to the cylinder head but be careful not to damage the fins. That will provide more room to work on those rusty fixings. The hex head may undo using a ring spanner or socket. If that fails us a good quality mole grips. The Torx will be more difficult but if it won’t undo with a Torx key or socket you may be able to grip it with the mole grips. Drilling it out is another option but if you don’t know what you’re doing you can cause more damage!
Bear in mind that debris is likely to enter the exhaust port so you’re going to have to remove the head and vacuum any debris off the piston crown and out of the port.
Let us know how you get on!