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Transmission to frame bolt hole

 
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CR_Bricker
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Joined: 06 Nov 2016
Posts: 25

PostPosted: Wed May 17, 2017 10:48 am    Post subject: Transmission to frame bolt hole Reply with quote

I recently managed to destroy second gear during some spirited riding on the twisties. Whilst I could have the gear repaired by undercutting the dogs in the end I decided it was cheaper and probably easier to buy a used transmission.

I found one on eBay from a 1993 K1100RS which looked great when I got it, the splines etc are almost new.

Yesterday I installed it and all was going great until I came to refit the M8 bolt on the RHS that goes through the frame into the transmission. Try as I might I could not get the M8 bolt to screw in. On closer inspection (I took the transmission back out again) I discovered the hole had been repaired with a M6 helicoil. A M6 bolt screws in no problem.

The rest of the transmission looks perfect and shows no sign of having been down or anything like that.

So I am looking for a little advice. Should I try and remove the helicoil that is in there and retap the hole for an 8mm or should I just install a 6mm bolt and ignore it?



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1991 K100RS with K1100 RS fairing
Costa Rica
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CR_Bricker
Brick Rider


Joined: 06 Nov 2016
Posts: 25

PostPosted: Wed May 17, 2017 11:20 am    Post subject: Reply with quote

Rechecking the correct bolt is a M10 1.5 and the helicoil that is in there is for a M8 1.25

I do have both a M10 1.5 tap and also a M10 1.5 helicoil so I might try taking out the old helicoil and just re-tapping a M10 1.5 thread first.

I will admit it makes me a little nervous
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1991 K100RS with K1100 RS fairing
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N41EF
Flying Brick Rider


Joined: 23 Mar 2014
Posts: 406
Location: Aiken, SC

PostPosted: Wed May 17, 2017 7:44 pm    Post subject: Reply with quote

I would leave the helical in, it's prob there because some one stripped it out, so if you pull it out you'll prob find the hole too large to tap. Just make sure the smaller bolt is an appropriate grade, and torque it to the spec for the smaller bolt.
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2014 R1200RT Water Cooled
2001 R1100S Light
1993 K1100LT. Nissan Ice Blue.(Gone)
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CR_Bricker
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Joined: 06 Nov 2016
Posts: 25

PostPosted: Sun May 21, 2017 2:12 pm    Post subject: Reply with quote

In the end I decided to drill out the M8 and install a M10 helicoil and reuse the correct size bolt which all went fairly smoothly. Now the bike is all back together and running well. So far I have only done one quick shake down ride to test out the new transmission but it feels great!
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1991 K100RS with K1100 RS fairing
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SugarHillCTD
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Joined: 10 Oct 2007
Posts: 4240
Location: Now in Eastern Pennsylvania

PostPosted: Sun May 21, 2017 8:32 pm    Post subject: Reply with quote

Excellent. Good to hear that it worked out for you.
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'92 K100RS4V Pearl White SOLD
'04 K1200GT
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