Mon May 23, 2022 1:26 am

Hooked
PK50XL, PK100S, ET3
Joined: 26 Aug 2020
Posts: 252
Location: UK
 
Hooked
PK50XL, PK100S, ET3
Joined: 26 Aug 2020
Posts: 252
Location: UK
Mon May 23, 2022 1:26 am linkquote
I've bought a mirror for the ET3 and am having a bit of a challenge getting the bolts into the headset. I think the threads are starting to go and in my enthusiasm to get the bolts in have added to this. Basically i got the start of the bolt to bite and then felt the thread go, so its a bit of a cross threaded mess now.


Can anyone confirm the thread size, are they M8x1.0?
Mon May 23, 2022 4:20 am

Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8848
Location: Atlanta, GA
 
Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8848
Location: Atlanta, GA
Mon May 23, 2022 4:20 am linkquote
I'm not sure, but if it only went a little way in before stripping it can probably be saved by very patiently running the (correct sized) bolt in without the mirror just to re-tap/form the threads.

You can also tap and run a slightly bigger bolt or a helicoil. But once the metal is gone there's no going back so I'd start with the smallest and gentlest repairs first
Mon May 23, 2022 6:02 am

Hooked
PK50XL, PK100S, ET3
Joined: 26 Aug 2020
Posts: 252
Location: UK
 
Hooked
PK50XL, PK100S, ET3
Joined: 26 Aug 2020
Posts: 252
Location: UK
Mon May 23, 2022 6:02 am linkquote
Thanks,

I'll try again with more patience next time. There does seem to be quite a depth that's not stripped so it might be a case of removing some of the cross threaded bit and then gently trying to get a bolt to bite without too much force.
Mon May 23, 2022 6:10 am

Molto Verboso
Joined: 03 Nov 2011
Posts: 1512
Location: Racing Capital of the World
 
Molto Verboso
Joined: 03 Nov 2011
Posts: 1512
Location: Racing Capital of the World
Mon May 23, 2022 6:10 am linkquote
Take it to someone and have the threads cleaned up with a tap.
Mon May 23, 2022 7:21 am

Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 5993
Location: San Diego, CA
 
Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 5993
Location: San Diego, CA
Mon May 23, 2022 7:21 am linkquote
taps are cheap if you want to try to clean it up yourself, but it's critical to use the right one
Mon May 23, 2022 7:49 am

Hooked
PK50XL, PK100S, ET3
Joined: 26 Aug 2020
Posts: 252
Location: UK
 
Hooked
PK50XL, PK100S, ET3
Joined: 26 Aug 2020
Posts: 252
Location: UK
Mon May 23, 2022 7:49 am linkquote
sdjohn wrote:
taps are cheap if you want to try to clean it up yourself, but it's critical to use the right one
Yeah, and thats the point that I'm at now. Knowing the size is critical. Measuring the bolts that came with the mirror, they are M8 1.25 and this is the same as the bolts that hold the seat down on the PK so i'm expecting that's what the headset is.

I've now discovered that my cheap ebay tap and die set has useless taps in it so will look to get a semi-decent set.

Once ive done that i'll have a bit of a practice before I try again on the headset.


Mon May 23, 2022 7:50 am

Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 5993
Location: San Diego, CA
 
Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 5993
Location: San Diego, CA
Mon May 23, 2022 7:50 am linkquote
practice on some nuts, especially if you've got some crusties sitting in the corner...
Mon May 23, 2022 8:05 am

Hooked
125 GTR 1977, 50S 1975, GTS 125 Supertech 2021
Joined: 04 Aug 2014
Posts: 194
Location: Madeira Island
 
Hooked
125 GTR 1977, 50S 1975, GTS 125 Supertech 2021
Joined: 04 Aug 2014
Posts: 194
Location: Madeira Island
Mon May 23, 2022 8:05 am linkquote
I had the same problem 1 week ago, messed bolt threads and so... tried not to panic and used a M8 tap to clean it, new M8 bolt and done.

I only used taps on college 40 years ago ... even so I didn't scare and did it

Ps: Got it from Amazon a couple of years ago, good quality:
https://www.amazon.de/gp/product/B0058CPERY/ref=ppx_yo_dt_b_asin_image_o02_s00?ie=UTF8&psc=1
Mon May 23, 2022 8:17 am

Hooked
PK50XL, PK100S, ET3
Joined: 26 Aug 2020
Posts: 252
Location: UK
 
Hooked
PK50XL, PK100S, ET3
Joined: 26 Aug 2020
Posts: 252
Location: UK
Mon May 23, 2022 8:17 am linkquote
sdjohn wrote:
practice on some nuts, especially if you've got some crusties sitting in the corner...
I was going to, I've also got the frame for the PK100 sat here which has the same size captive nuts to hold the saddle on, they're full of rust and paint so should be good for practicing on.
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