HELP mac 2-1 exhaust

mxryder21 · Full Member Joined: May 22, 2007 Posts: 20

Why is the flange so thin? There is a huge gap between the exhaust port and the flange (about an inch or so) and the stock acorn nuts arent deep enough and there wasnt any new nuts in the box. Am I missing parts or something?

INXS650 · 650Rider Supporter Joined: Mar 22, 2007 Posts: 645

You can either get different nuts (non acorn), or you can get some washers to take up the extra space.

KYLEPRESTON · Posted: June 14, 2007, 8:55 am Post subject: Re: HELP mac 2-1 exhaust

WHAT KIND OF EXHAUST GASKET ARE YOU USING? DID YOU HAPPEN TO PUT IN THE NEW GASKET WITHOUT TAKING OUT THE OLD ONE?
AWFULLY BIG GAP

mxryder21 · Full Member Joined: May 22, 2007 Posts: 20

uh, it didnt come with any exhaust gaskets. I looked at the stock exhaust and it doesnt have any either but the flanges are way different. Maybe I need a gasket with the Mac exhaust then? I was thinking about using upen ended nuts but since there is a gap will it bend the flange since its not sitting tight against the head? thanks for the help guys.

KYLEPRESTON · Posted: June 14, 2007, 11:17 am Post subject: Re: HELP mac 2-1 exhaust

HEY MIKES XS SELLS EXHAUST GASKETS I THINK THEY ARE COPPER I DON'T HAVE THE SITE UP INFRONT OF ME BUT THEY SHOULD BE USED U CAN ALSO REUSE THE FINNED FLANGE THAT CAME STOCK IF YOU HAVE IT. THAT'S WHAT I AM DOIN G IT GIVES YOU A BIT OF PERFORMANCE AND STOCK LOOK AT THE HEAD.

GOOD LUCK KYLE

Bobman · Posted: August 25, 2007, 8:43 am Post subject: Re: HELP mac 2-1 exhaust

MX, when you get squared away with the exhaust, post your results. I'm considering the 2 into 1 for my 81' and would love to know how yours turns out. good luck

tracker79 · Posted: August 25, 2007, 12:17 pm Post subject: Re: HELP mac 2-1 exhaust

Are you sure the gaskets aren't still inside the exhaust port? My flanges has about 3/4 of an inch gap. Tighten up even and recheck after each ride, mine set in after about 3 rides.

ponyjr · Full Member Joined: Jul 30, 2007 Posts: 32

i just put a pair on my bike too...mine sit out as well... you do need new nuts and i put a new set of gaskets on it too.. its normal for them to sit out.

kenny · New Member Joined: Dec 28, 2007 Posts: 5

Hi I just purchased a Mac 2-1 system and I have the same question, there is about a 1/2 inch gap between the exhaust port where the header pipe goes in and the flange(mounting bracket). This doesn't seem right, the gap is about 1/4 of an inch without a gasket in the port hole.

Jack · Full Member Joined: Mar 15, 2005 Posts: 411

The step in the exhaust port is for the stock header flange and you can fill the area in to reduce resistance as the gas pulses enter header either by welding, aluminum sleeve or cut 1section of 1 1/2 exhaust pipe to fill the step in but with the exhaust pipe you'll need to apply high temp silicone to hold in place..............................Jack

xs650temp.proboards29....1167445944

grizld1 · Posted: December 29, 2007, 12:18 pm Post subject: Re: HELP mac 2-1 exhaust

That'll work! Or you can cut the seating ring off the front of the old stock headers with an inch or so of pipe, peel off the outer layer of the 2-layer pipe, grind smooth, and smack 'em into the MAC headers. Use spacers, washers, whatever behind the MAC flanges.

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