Problem with the gilera 172 , it's origionaly a 125 but now it's got a malossi 172 kit racing clutch and racing crank, and standard exhaust, Problem is A while ago there was an hole about the size of a tennis ball in the exhaust, dono how it happened, then got it fixed and the exhaust got a hole in it again, then got it fixed again and there is another hole in it,
Any ideas why this is happening. When it was fixed i dono how it was fixed like was hole welded or what,
Please help