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Mechanical and Technical Mechanical and technical topics, help, and discussions

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  • 2 Post By curve addict
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Oct 12th 2018, 03:22 PM   #1
 
  Mar 2018
  Gig Harbor

  2008 BMW R1200GS Adventure
Holy Gear Slips, Batman!

Got on it a little hard on the way home today. While passing a car I went from 2nd to 3rd and just as I was about to hit redline and shift to fourth, it slapped back down into second causing me to decelerate really hard until I could shift back up again.

Itís done this from time to time but only right after I shifted up a gear. Itís never done it that far into the next gear.
Oct 12th 2018, 03:41 PM   #2
 unicykle's Avatar
 
  Sep 2017
  milwaukie oregon

  gsxr600 gsxr750 gsxr1000 i like gsxrs
Most bikes have some false neutrals but ive never heard of one going down a gear on an upshift, you sure your not hitting the shifter with your boot getting your foot under the shifter? Hows the motor doing cause miss shifts like that force spins the motor past rev limiter and things go bad fast. Bad part is you got to dig pretty darn deep to check all the tranny stuff.
Oct 12th 2018, 04:11 PM   #3
 WarpShatner7's Avatar
 
  Jan 2016
  Here

Clearly your gear oil isn't German enough.

Seriously, I ride a hexhead and I've very occasionally had it pop out of second when accelerating hard from low RPMs after a shift, but nothing like you're describing. Your best bet is probably to ask on the BMW forums -- bmwsporttouring.com is pretty grown up -- if it's at all a thing someone will be familiar with it.
Oct 13th 2018, 09:11 AM   #4
 curve addict's Avatar
 
  Apr 2016
  Des Moines, WA

  ...1987 Yamaha FZR1000...
If, during this instance, your foot pressure had completely engaged 3rd gear, then the most likely cause is a bent shift fork. If it continues to happen, that's what you should expect to replace, at a minimum.

Now for some good news, I hope. Those machines, most bikes actually, shift best when one pre-loads the lever. While still under power, and before touching the clutch lever, apply ~ 8 to 10 lbs of pressure to the lever. Once you reduce throttle and/or disengage the clutch, the lever will fully and positively engage the gear selected every time. All it takes is enough practice to become habit.

If you, didley, are already shifting this way, my apologies and please refer to my first statement. The info still may help another.

Good luck
HalcyonSon and Didley like this.
Nov 15th 2018, 03:38 PM   #5
 
  Mar 2018
  Gig Harbor

  2008 BMW R1200GS Adventure
Quote:
Originally Posted by curve addict
If, during this instance, your foot pressure had completely engaged 3rd gear, then the most likely cause is a bent shift fork. If it continues to happen, that's what you should expect to replace, at a minimum.

Now for some good news, I hope. Those machines, most bikes actually, shift best when one pre-loads the lever. While still under power, and before touching the clutch lever, apply ~ 8 to 10 lbs of pressure to the lever. Once you reduce throttle and/or disengage the clutch, the lever will fully and positively engage the gear selected every time. All it takes is enough practice to become habit.

If you, didley, are already shifting this way, my apologies and please refer to my first statement. The info still may help another.

Good luck

I havenít been shifting that way. Glad I saw your post. Iíll give it a go. Thank you.
Nov 16th 2018, 11:39 AM   #6
 
  Oct 2018
  Grants Pass

Are you certain the edge of your shoe/boot didn't snag the shifter jockeying your foot into position for the next upshift?
That sounds really odd to make it to the upper rev range [I]and then pop[I]..
Nov 16th 2018, 05:28 PM   #7
 Suzuki Stevo's Avatar
 
  Jan 2016
  Seattle ,Wa

  Burgman 400, TW200, Boulevard M50, 2018 Indian Scout 1131, 2018 Indian Chieftain Classic
If yer shift lever is adjusted correctly and have good oil and a proper clutch adjustment....then it's either rider induced or a bent shift fork?

EDIT: Foot pressure on the shift lever needs to be released completely between gears for the shift pawl to ratchet to the next gear correctly...part of the rider induced aspect

Edited by Suzuki Stevo on Nov 17th 2018 at 01:49 PM
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