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Expansion chamber and muffler to suit the 75 B model YZ 250 & YZ 360.

Expansion Chamber

Chamber is a right hand side version which is what the OW versions were but this one is built with the usual GMC "artistic licence"

Chamber bolts up to the original mount but has a larger stinger tube, (the originals had a stinger tube more suited to a 125) so this system is sold as a combo chamber / muffler deal.

This chamber fits the bike easily. (anything fits easy compared to the original left hand system!)

Muffler / Silencer

This muffler fitment is different to stock so it won't fit the original chamber

The original silencer won't fit this chamber

Elsewhere on my shop I offer a muffler that fits the stock system.

Round satin polished aluminium repackable muffler with steel end caps. Easily repackable by removing screws in endcaps.

The endcaps are fitted with nutserts which is superior to rivets or just screwing into sheetmetal due to them having more threads to hold the screws.

Hand built made in Australia.

Click image to enlarge.

More info.