yeah to matters worse with thos exhaust studs it was the 6mm end that screwed into the cylinder so ya swinging on an 8mm nut tightening the exhaust then 'ping'--it breaks off flush with the cylinder. Might've run that up to DT360A as well but remember it on smaller motor exhaust headers, Used to tap the cylinder flange thread to 8mm if we had one break off. Makes you wonder what their plan was with that idea & maybe everyone was on holiday so the apprentice designed it.

Right, just been out to check my AS3 engine again (whole bike was bought dismantled, so engine currently on the bench) and, as luck would have it, the studs are quite loose and so I was able to remove one. Size is definitely 6mm (M6) both ends.

My DT360 exhaust stud broke off, I drilled and tapped to 8mm also like you said. I remember tightening the 8mm nut thinking the whole stud was 8mm, not 6mm going into the cylinder.

Sorry about putting ya off the scent as to 6mm or not. Sometimes i should just shut up haha.

Not at all RT!

Clearly no-one was absolutely sure and as some already knew, Yamaha did fit the occasional M6/M8 stud. And I still reckon that one end of the stud that I posted a picture of looks wider than the other!

Rendering Error in layout Message/Item: fopen(http://open.api.ebay.com/shopping?callname=GetSingleItem&appid=makotosu-08bc-47da-8e7d-68e3ee6e51ca&siteid=0&responseencoding=JSON&ItemID=231822664709&version=889&trackingid=&trackingpartnercode=9): failed to open stream: Connection refused. Please enable debug mode for more information.

Please Log in or Create an account to join the conversation.