BMW K bikes (Bricks)

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tinyspuds

tinyspuds
Silver member
Silver member
Iím following up on the above thread, but my thinking isnít yet ready for the Ďhow toí section.

Iíve started my upgrade, taken off the brake pedal, detached the old m/c but left everything piped in just to be sure I can get on the road for my Friday trip, and sawn off the new push rod.

The two methods of articulation explained previously are to either drill a detente into the end of the new push rod or; burr the end off the new push rod, and create a larger detente in the head of an 8mm bolt which replaces the existing adjustor bolt in the pedal.

Both of these methods are intended to replicate the articulation available in the OEM nipple and detente arrangement.

I am planning to take the first approach as I have neither lathe or drill press but in getting this far it occurs to me that rather than drill the detente why not just leave a push rod nut a couple of threads proud of the rod (maybe loctite in place) and let the nut Ďcaptureí the nipple...
replacing-rear-master-cylinder-with-a-chineese-one D8d5ff10
replacing-rear-master-cylinder-with-a-chineese-one 08f4d510
What have I missed?


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LLís.
2007 HD883 Sportster. Bobbed and bettered.
1954 Royal Enfield 350 Bullet. Original.
    

MartinW

MartinW
Life time member
Life time member
You don't need a lathe or a drill press. An electric drill and a vice will do the job.
Regards Martin.


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K75s Hybrid
    

tinyspuds

tinyspuds
Silver member
Silver member
Thanks Martin, I know youíre right but I wanted to test out the theory so in the meantime Iíve just dry run it with a locking nut (there is room on the rod for two and still have full compression) and the top nut left 2 and a bit threads proud and it looks and feels like a very secure cage for the adjustor nipple. Iím going to leave the original gaiter off for now so I can watch it in action. Do you see any risks?
Cheers, Stu

replacing-rear-master-cylinder-with-a-chineese-one 6609e510

You can just make out the nipple almost completely buried inside the nut and the nut is set just low enough that the flange around the nipple clears the nut at full articulation of the rod. Iím going to make up a s/s brake line and a mount for the new reservoir for a test at the weekend.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LLís.
2007 HD883 Sportster. Bobbed and bettered.
1954 Royal Enfield 350 Bullet. Original.
    

Laitch

Laitch
Life time member
Life time member
A jam nut could always be used as the locking nut if a little more thread length on the rod is desirable. Thanks for experimenting with this.


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1995 K75T 68,000 miles
replacing-rear-master-cylinder-with-a-chineese-one Usa-lo10
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I am pretty sure your approach will work fine.† So far, I have done three bikes with the ChiCom M/C using the drilled detent, but the thought of using a second nut or backing off the single nut, holding it with Loctite has crossed my mind.

The reason I went with the detent was that I cut off the rod pretty close to where it exits the rubber boot, and was concerned that cupping the ball on the pedal with the nut would cause some binding.† The detent just looked to me like it would allow easier movement of the two parts relative to each other.†

Really, I can't see any problem with your approach.


__________________________________________________
Present:
1994 K75RT
1991 K100RS

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

MartinW

MartinW
Life time member
Life time member
+1 I can't see any problem with it. There is more than one way to skin a Roo.
Regards Martin.


__________________________________________________
K75s Hybrid
    

tinyspuds

tinyspuds
Silver member
Silver member
Very true Martin. But at this end of the world stealing the roo would be almost as dangerous as my mechanical tinkering...

mech††Green Kangaroo††BAlance


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LLís.
2007 HD883 Sportster. Bobbed and bettered.
1954 Royal Enfield 350 Bullet. Original.
    

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