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Thread: 1971 r75/5 exhaust routing issues

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  1. #1

    1971 r75/5 exhaust routing issues

    I am having an issue with exhaust fitment. On the left side of the bike I am having a problem moving the exhaust inboard enough so the gear shift doesn't hit against it when going into first. The muffler also barely clears the left shock as well. When installing the headers do they have to be seated in as far as they go or can you leave them out a little and tighten in place. Seems like a simple task but it's been a struggle for some reason.

  2. #2
    Registered User beemeruss's Avatar
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    Quote Originally Posted by gwrodzhi View Post
    The muffler also barely clears the left shock as well. Seems like a simple task but it's been a struggle for some reason.
    It may be as simple as the mufflers being installed on the wrong sides.? That would change the way they hang. Was the exhaust system removed by you and, if so, did it seem correct previously? On my '78 R80/7 the headers go all the way into the heads and that gives maximum support and sealing but I suppose that being out just a little would work. Keep us posted.

    Russ

  3. #3
    Liaison 20774's Avatar
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    Some pictures of the installation and parts might help.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  4. #4
    Not on wrong side, indentations for brake lever makes them pretty much impossible to reverse. Will try to get some pictures tomorrow. Does anyone have close up pictures of the exhaust near the foot pegs. Thanks

  5. #5
    Liaison 20774's Avatar
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    All kinds of photos here:

    http://www.bmbikes.co.uk/photopages/photosr75-5.htm

    Not sure if they have what you want.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  6. #6
    John D'oh
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    Exhaust headers must seat firmly in the exhaust spigot on the head with the split ring steel exhaust gasket against the spigot (solid ring in front). Correctly installed the crossover openings will face each other and the crossover pipe will fit in between with overlap on the header crossover outlets determined when the rear mounts are tight. The stock rear header mounting bracket marked 40 sits outboard of the foot peg mounting lug installed on the engine mount bolt and positions the header below the shift lever. The correct /5 muffler connects to the header below the shift lever and foot pegs on either side. The muffler mount flange should line up with the frame muffler hanger bracket and attach with two socket head 6mm bolts. There is a channel in the bottom of the left muffler that lines up with the rear axle. If you do not have stock BMW exhaust components for /5 short frame or correctly made after-market parts the previous info may not apply
    John D'oh

  7. #7

    New or used exhaust?

    The OP doesn't provide the origin of the exhaust system or if its a complete system or just headers, it would help greatly. If its not fitting correctly there could be a number of factors involved.

    If the exhaust came off the bike it should go right back on after cleaning it and assuming it wasn't damaged while off. If you took it apart while off the bike you have to be sure its put back on piece be piece and loosely fitted all the way to the back with the head pipes completely seated in the exhaust ports.

    If its a new aftermarket system hopefully it is a direct fit system from a reputable supplier or you may be in for a real adventure and likewise if its a used system from another bike.

  8. #8
    With most bikes, one needs to loosen up the entire exhaust system from the manifolds back, mount the silencers, and then tighten from front to back. I've had stock mufflers refuse to fit with stock headers until I loosened everything up. Not always easy with the exhaust ring nut frozen.
    '61 Clubman's Gold Star, '13 690 Duke, '13 Daytona 675R, '17 1290 GT, '18 Street Triple RS (gone but not forgotten: '76 R75/6, '84 R100, '76 R90S)

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