BMW K bikes (Bricks)


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1Back to top Go down    UGH! Stripped fork oil drain plug on Sun Aug 06, 2017 4:17 pm

zaubertuba

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Well, between too thick a sealing washer, using too big a torque wrench, previous wear and my own ham-fistedness, I badly stripped out my fork oil drain plug on my left fork. Like, reamed it out smooth bad. Embarassed

I somehow managed to salvage the right plug.

What's my best remedy? Order a Time-Sert? Time to go get that tap & die set? Any better options?

As an aside, nearest I can tell the fork oil capacity for an '85 K100RS is supposed to be 380ML after a full teardown. This sound right?


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1985 K100RS
    

2Back to top Go down    Re: UGH! Stripped fork oil drain plug on Sun Aug 06, 2017 4:21 pm

duck

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If you're interested I'll sell you a pair of 85 forks for $100 plus shipping. (Which shouldn't be too bad since I'm in Washington.)


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down    Re: UGH! Stripped fork oil drain plug on Sun Aug 06, 2017 4:45 pm

zaubertuba

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@duck wrote:If you're interested I'll sell you a pair of 85 forks for $100 plus shipping. (Which shouldn't be too bad since I'm in Washington.)

Thanks very much...I obviously didn't budget for it so let's call it "Option B" for the moment. Nice you're so close! Cool


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1985 K100RS
    

4Back to top Go down    Re: UGH! Stripped fork oil drain plug on Sun Aug 06, 2017 5:54 pm

Point-Seven-five

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That is tough news. Every time I touch those screws I hold my breath.

I repaired a stripped out hole in the final drive for the speed pickup screw by inserting a pop rivet and then threading it. It's still holding. That was for a smaller screw though, and you may not be able to find a large enough pop rivet.

The only other fix I can think of would be to have a welder fill the hole and then drill and tap for your M6 screw. Or possibly fill with that magic compound, JB weld.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down    Re: UGH! Stripped fork oil drain plug on Sun Aug 06, 2017 6:49 pm

Laitch

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@zaubertuba wrote:. . . I badly stripped out my fork oil drain plug on my left fork. Like, reamed it out smooth bad.
These look fun!
http://www.motobrick.com/index.php/topic,580.msg62505.html#msg62505
http://www.motobrick.com/index.php/topic,580.msg63494.html#msg63494


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1995 K75T 68,000 miles
    

6Back to top Go down    Re: UGH! Stripped fork oil drain plug on Sun Aug 06, 2017 9:03 pm

Dai

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6mm Helicoil or take it out to M8. There's enough ally there to accept an M8 but you may need to cut a bolt to length. Putting in a Helicoil really isn't that difficult. The hardest part is ensuring that the tap goes in perpendicular to the hole.

Either way, you have to split the fork. Now, if the damper rod bolt refuses to come out - that's a complete b*st*rd of a job to remove. But there's ways round that too.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

7Back to top Go down    Re: UGH! Stripped fork oil drain plug on Mon Aug 07, 2017 1:13 pm

Two Wheels Better

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I used a 6mm Helicoil kit, which was a simple fix, but then had to source a much wider sealing washer to cover the wider-than-the-original-sealing washer's-capacity threaded area. No leaks after 5,000+ kms.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

8Back to top Go down    Re: UGH! Stripped fork oil drain plug on Mon Aug 07, 2017 3:11 pm

duck

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You could also use an O-ring to seal it. (Which is what the 4V Ks use.)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

9Back to top Go down    Re: UGH! Stripped fork oil drain plug on Mon Aug 07, 2017 9:09 pm

zaubertuba

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Thanks for all the tips, guys! Smile

In the end, I opted for the "longer screw" option and I did indeed get the screw to hold very tight...though I expect I'll have to do something more drastic at the next fork oil change. Wink

Bike rides great--except a new issue I'll make a separate post for--thanks again!


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1985 K100RS
    

10Back to top Go down    Re: UGH! Stripped fork oil drain plug on Mon Aug 07, 2017 9:32 pm

Dai

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Just as long as the new screw is only the depth of the boss on the slider. There's only a mm or so between the inside of that thread and the valve housing ( part no. 9 here: http://www.realoem.com/bmw/enUS/showparts?id=0501-EUR-11-1983-K589-BMW-K_100_83_0501,0511_&diagId=31_0359). I took one set of forks apart where someone had replaced the drain screw and the replacement screw had dug a good gouge into the valve housing. Push it across too far and it will affect the damping.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

11Back to top Go down    Re: UGH! Stripped fork oil drain plug on Tue Aug 08, 2017 2:15 am

blaKey

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Handy to know Dai.

Thanks.


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Neil
K100RS 1986 RED!
K100RT 1987 (now nekkid with red bits)

Remember Rule No. 6
    

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