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1975 Commando MK3 exhaust header fitting

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Hi again everyone my exhaust front pipes are not the standard balanced pipes but are I believe earlier commando pipes unbalanced and fitted to pea shooters I had to remove my right side down pipe and when doing so 2 collets and a domed washer fell out and I did not see how or in which order or position to install them there is no gasket and the system was not leaking before I interfered with it could someone please explain to me in which order and position I need to replace them in please see pics sorry for the dumb Q but my manual simply says replace as removed nothing about falling out many thanks Chris

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 ... fits straight into the head with the flat face innermost. Then the exhaust pipe flange then the 2 collets with the narrow side outwards followed by the securing nut. There isn't enough thread to put a copper / asbestos washer under the domed seating. The dome is to allow the line of the pipes to be tweaked slightly to get a better run and avoid distorting the mounting bobbins. Originallu used with the balance pipe exhausts but fine with the separate ones.

It doesn't normally leak but if required a thin smear of ordinary bathroom silicone on the flat face of the domed component will make sure. It won't melt or burn away.

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I run the same system on my Mk3 850.

On some cheaper pipes the flange can break a bit off when tightened up, so beware and keep the flange square with the port. 

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Thanks for the replies, on the same exhaust settings as I have described I have heard that I should also change the main jets I have new carbs on it but they are jetted for a balanced pipe system so I would imagine I need to change the main jets can anyone tell me what size I need thanks again everyone Chris

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Hi i changed mine to peashooter exhausts as well it also had the balance pipe but when i checked the jets it already had the 260 one in 

 


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