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Upper shock mount post threads bad. What to do?
- Skyman
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- 1978 KZ1000-B2 LTD 1982 KZ1000-M2 CSR
I was hoping I could replace the post, but it looks like it is welded into a hole in the frame and is not removable.
What would you do?
West Linn, OR
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- KZQ
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- Walking Behind the Corn May Not Be All That!
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KZCSI
www.KZ1300.com
Riders:
1968 BSA 441 Shooting Star, 1970 BSA 650 Lightning, 1974 W3, 1976 KZ900, 1979 KZ750 Twin, 1979 KZ750 Twin Trike, 1981 KZ1300, 1982 KZ1100 Spectre, 2000 Valkyrie, 2009 Yamaha Roadliner S. 1983 GL 1100
Projects:
1985 ZN1300
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- Skyman
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- 1978 KZ1000-B2 LTD 1982 KZ1000-M2 CSR
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I guess I'd lay some weld onto the threads and try to recut them with a die.
KZCSI
Interesting idea. I don't have the skills or equipment to attempt that. Since the post won't come off the bike, do you think this could be done while still mounted to the frame? Wouldn't you need to lathe it back down to "round" before attempting to recut it? Is there another way to do it while still on the frame?
Maybe I can ride down to Bend and you can show me how that's done.
West Linn, OR
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- Grantl
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1) Purchase the correct thread chasing die, and thread it on backwards (so that the die will cut when you unthread it) then JB weld the end of the stud. Make sure you completely fill in between the thread crests all the way around the stud. When the JB weld has hardened, file down the excess until the thread crests (major diameter) are slightly exposed. Put some thread cutting oil on the stud and then work the thread die back off the stud. The die should cut a near perfect thread as it comes off the stud.
2) Same as 1) except weld the stud end.
There's my 2 cents worth.
1981 KZ1000 CSR
1983 KZ750 Project Bike
1990 550 Zephyr
1994 KZ1000 P
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- Skyman
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There are 2 ways I would attempt to repair the stud.
1) Purchase the correct thread chasing die, and thread it on backwards (so that the die will cut when you unthread it) then JB weld the end of the stud. Make sure you completely fill in between the thread crests all the way around the stud. When the JB weld has hardened, file down the excess until the thread crests (major diameter) are slightly exposed. Put some thread cutting oil on the stud and then work the thread die back off the stud. The die should cut a near perfect thread as it comes off the stud.
Very cool. Now THAT sounds like something I can do. Thanks.
West Linn, OR
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- StreetfighterKz
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Your most likely going to have to get a die from Snap-On, Mac Tools, or Matco. Sears, Harbor Freight, Autozone, Advanced Auto doesn't carry the right thread pitch. You'll need a 12mm x 1.0mm pitch.
OR I was suggested using a thread file as long as the threads are too boogered up.
Good luck!
Later, Doug
1978 z1000 Streetfighter
1976 z900 Stripfighter (work in progress)
1983 Gpz750 Resto-Mod
1989 Vmax
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- jordan
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KZ810 streetfighter kz/gpz/gsxr
1983 gs1100e
1979 KZ 1000 1428 dragbike project
1974 kawasaki H1 500 sold
1972 Kawasaki s2 350-parted on ebay
1973 Kawasaki s2 350-parted on ebay
1982 kz750(sold)
1978 kz650 hardtail(sold)
1975 honda xl250-sold
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1982 yamaha xs400
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- riverroad
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Cut the end of the stud off flush to the width of your shock eye bushing. Drill and tap said stud to say, 1/4-20 size, and use a short stainless allen head bolt with a stainless fender washer and some red Loktite to hold it all together.
You could actually drill and tap it to a smaller size than 1/4-20 so as to maintain more wall thickness on the shock stud. All of the load right there is sheer load, so you'd want the wall of the hollowed out stud to be as thick as possible. But it would be crucial for the hole to be drilled absolutely straight for this to work.
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- conpewter
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It's also gasoline and waterproof so.. if they ever get their clear version done we could coat our tanks with it ;o) (or if you'd like a dark gray flat finish could use the original right now...)
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- wiredgeorge
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StreetfighterKz: are you sure the pitch is 1.0 on the 12mm die? My memory tells me it is 1.25 pitch... I could well be wrong. I have a die specifically for this purpose and it is up in the shop. You can buy these dies from Maryland Metrics... it IS the correct size/pitch its just that my memory tells me it is 1.25 pitch. I will check and correct if I am wrong which is entirely possible.
wiredgeorge Motorcycle Carburetors
Mico TX
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- StreetfighterKz
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Later, Doug
1978 z1000 Streetfighter
1976 z900 Stripfighter (work in progress)
1983 Gpz750 Resto-Mod
1989 Vmax
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- Skyman
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I ordered a M12 x 1.25 die from Snap-on's website. $3.30 INCLUDING UPS GROUND SHIPPING. :blink:
Wow. What a deal. It would cost me more in gas just to drive to the store to buy it. :laugh:
I'm on the road this week, so I have time to wait for it to ship to me. When I get back, I'll give the JB Weld a try and report back.
Riverroad, I actually thought the same idea you had. And I ain't even Southern! I might try that if the JB Weld doesn't work.
Thanks all for your input!
West Linn, OR
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