FS 650 E 2006 AU/NZ Exhaust Mod

Hi Guys,

I've tried finding the answer to this question on this forum, but not had any luck with this specifically; so hope someone can help me?

I've just replaced the packing in my can and noticed the design of the AU cans is different from the US and EU cans? Even the later model FS 650's have a different design to the '06.

On my FS 650 E '06 AU/NZ model can, there is a long pipe that extends from the end pipe cap into the rear chamber towards the mid chamber. It seems to pretty much sit hard up against the mid chamber, beneath the pipe outlet coming in from the exhaust.

My question is can I shorten this length of pipe a few inches to help the bike breath a bit more? It seems very restrictive? (picture attached with the place I thinking to cut?)

If I do shorten it by only a little, can anyone advise if they have done this, and does it lead to jetting issues?

Thanks in advance!

Cheers! RJ

Thanks BushMechanic - really appreciate the quick and detailed reply!

I think I'll go with the second option you listed; the drilled out pipe. Hopefully this wont' be too much a change in performance, and I won't need to adjust the carb.

I'll get onto this now and post the results...

Thanks again!

RJ

Hey Crew, Just been out for my first ride since I bought the bike, and rebuilt it. Based on the info provided by Bushmechanic, I cut off 3cm from the inner pipe (the asymmetrical bit) and this has helped immensely; the bike feels free and has a subtle but awesome pop on decel. Love it. Can't take the grin off my face. Cheers.

Hey, Nope. No carb adjustments.

Just to clarify; I stripped the silencer, replaced the exhaust chamber with new packing, (4T from local bike store, single wrap cut to size at home with scissors), then left mid pipe untouched. No re-pack in the end chamber. Cut the end pipe by 3cm (just the "squashed" bit) . Rivet everything back up. Done... No changes to carb. doesn't "feel" lean. Just feels lighter and has a subtle "pop" on decel. Sounds really healthy. No plans to re-jet at this stage. Cheers!