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Trouble installing 2 in 2 MAC slash pipes on '82 920

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Trouble installing 2 in 2 MAC slash pipes on '82 920

PostAuthor: wrenchguy » Sat Dec 08, 2018 10:22 am

Having a heck of a time installing 2 in 2 MAC pipes on my xv920. I already installed the front pipe, new gasket, and attached properly (checked and rechecked) yet the attachment on the other end doesn't line up anywhere near the peg bolts:

mount.jpg


Does anyone have any idea on how to slip this down pipe on? I have tried every which way to wriggle it on- and I'm at the point where I think I can't put it on without taking off the rear tire.

downpipe.jpg
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Re: Trouble installing 2 in 2 MAC slash pipes on '82 920

PostAuthor: wrenchguy » Sat Dec 08, 2018 10:24 am

Instructions are downright horrible:
004-0521.pdf
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Re: Trouble installing 2 in 2 MAC slash pipes on '82 920

PostAuthor: nanno » Sat Dec 08, 2018 10:42 am

I seem to recall, that with the MAC 2in1 you had to lift the frame backbone off the frame in the rear as the flange was too wide to go through the frame.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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Re: Trouble installing 2 in 2 MAC slash pipes on '82 920

PostAuthor: chrismalm » Sat Dec 08, 2018 10:48 am

Here's my :2cents:
Having just disassembled a 920 I can tell you the rear wheel has to come off to replace the rear exhaust header pipe. It looks like your front muffler needs another 1/2" to reach the passenger peg stud. Could you possibly have two copper gaskets on your front cylinder ? You have to dig the old one out.
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Re: Trouble installing 2 in 2 MAC slash pipes on '82 920

PostAuthor: wrenchguy » Sat Dec 08, 2018 8:09 pm

Nanno and Chris, thanks for your quick responses.

Chris- you nailed it. The old gasket was pretty embedded in there- I had to use a putty knife to wedge it out. Pipe went back on and it now hangs off the rear passenger peg as it's supposed to do.

I'll loosen the rear wheel and just pull it several inches, just enough to slip the down pipe on and take it from there.

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Re: Trouble installing 2 in 2 MAC slash pipes on '82 920

PostAuthor: Flyingdog » Sat Dec 08, 2018 11:58 pm

wrenchguy wrote:I'll loosen the rear wheel and just pull it several inches, just enough to slip the down pipe on and take it from there.


Do whatcha want, but as Chris pointed out, now would be an excellent time just to take the wheel off and clean/inspect/re-grease everything. Besides having boo-coo room. Weird how many balk at taking the wheel "off". Besides being one of the easiest maintenance procedures, still amazes me how often this area is sooo overlooked. Not a whole lotta moving parts inthere, but what there is, it's essential they "all" work. Specially when it comes to brake dust/the shoes/drum. That crap is sooo fine, gets into areas it shouldn't. That dust, combined with any grease that might leak from the splines or where ever, can do some funky things. Not good, when the rear brakes are needed the most.
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Re: Trouble installing 2 in 2 MAC slash pipes on '82 920

PostAuthor: wrenchguy » Sun Dec 09, 2018 10:17 am

Flyingdog wrote:
wrenchguy wrote:I'll loosen the rear wheel and just pull it several inches, just enough to slip the down pipe on and take it from there.


Do whatcha want, but as Chris pointed out, now would be an excellent time just to take the wheel off and clean/inspect/re-grease everything. Besides having boo-coo room. Weird how many balk at taking the wheel "off". Besides being one of the easiest maintenance procedures, still amazes me how often this area is sooo overlooked. Not a whole lotta moving parts inthere, but what there is, it's essential they "all" work. Specially when it comes to brake dust/the shoes/drum. That crap is sooo fine, gets into areas it shouldn't. That dust, combined with any grease that might leak from the splines or where ever, can do some funky things. Not good, when the rear brakes are needed the most.


Yeah, you have a good point.

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