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Old 06-10-2019, 07:53 AM   #1
superhawk
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bike slips into neutral

Friend is looking at buying a 2011 zx6. The seller states that sometimes in the 1st three gears it slips back into neutral. the bike was lowsided on the shifterside at a low speed. I have my suspicions that it will be a simple fix. Any ideas of what might be causing this? He hasn't gone to see it and test ride it yet
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Old 06-10-2019, 08:02 AM   #2
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Unless you plan on rebuilding the transmission, stay away. The cost if you took it to a shop would be in the neighborhood of 2 to 3 thousand dollars. Unless the bike is at a give away price, and you can and will do the work yourself, find another bike.
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Old 06-10-2019, 09:08 AM   #3
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simple problem is the shift linkage geometry is off from the crash and its not going fully into those gears.

complicated problem is the entire gearbox is hammered and needs replacing. IIRC, the zx6 has a cassette gearbox. so the whole thing comes out in one piece and can be replaced without too much effort. ive seen race teams do it in between practice sessions. finding a new good gearbox will prob be the hard part. or u can replace gears, dogs, and shift forks for half the gearbox.

in this case, I think theres little chance that the gearbox is perfect. the seller prob has been riding with it popping out. thats not someone that takes care of their stuff.
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Old 06-10-2019, 09:15 AM   #4
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It could be as simple as a shift star detent spring/roller issue, or the tranny gears are worn.
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Old 06-10-2019, 10:39 AM   #5
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If you're handy with a wrench and the price is right, AND the rest of the bike is in good shape, it might be worth it. However, more often than not when bike is popping out of gear, it's due to bent shift forks and/or worn engagement dogs. Both require disassembly of the transmission to repair.

Does anyone know if the dogs on this bike came from the factor undercut? If so, that makes a dog problem much less likely. But it still could be a bent fork problem.

OP: Have your friend tread carefully and keep his eyes wide open. It could be an expensive mess. What's the impression of the seller? A yahoo who thrashes his stuff? Or a mature rider who takes care of his stuff. If the former, walk away.
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Old 06-10-2019, 10:58 AM   #6
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Slipping in 3 gears could just be the seller's lazy foot all the way to extreme
open case surgery to replace 3 gears... leverage the deal where the cost of the
extreme fix is well within the buyers favor or end up with a under valued parts bike...

Pic 1)Worn Shift Dogs due to tip over...
Pic 2) Bent Shift Fork due to tip over...
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Old 06-10-2019, 11:01 AM   #7
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Quote:
Originally Posted by kuksul08 View Post
It could be as simple as a shift star detent spring/roller issue, or the tranny gears are worn.
This was the case when I bought my first 848. The owner low sided it and it scared him so i bought it. Road it for 3 trackdays then the shifter gut stuck in 3rd. Took it to Nichols and it was an inexpensive fix. But you never know
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Old 06-10-2019, 11:51 AM   #8
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Heres the CL ad

https://prescott.craigslist.org/mcy/...908530449.html
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Old 06-10-2019, 12:03 PM   #9
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My friend knows his way around bikes. Not a pro mechanic, but he know his stuff. I told him to take it for a test drive and see. Hell for that price i may even check it out.
Quote:
Originally Posted by ST Guy View Post
If you're handy with a wrench and the price is right, AND the rest of the bike is in good shape, it might be worth it. However, more often than not when bike is popping out of gear, it's due to bent shift forks and/or worn engagement dogs. Both require disassembly of the transmission to repair.

Does anyone know if the dogs on this bike came from the factor undercut? If so, that makes a dog problem much less likely. But it still could be a bent fork problem.

OP: Have your friend tread carefully and keep his eyes wide open. It could be an expensive mess. What's the impression of the seller? A yahoo who thrashes his stuff? Or a mature rider who takes care of his stuff. If the former, walk away.
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Old 06-10-2019, 12:06 PM   #10
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If you can get your hands on the bike, unbend the shift lever, confirm shift lever linkage is moving cleanly, test ride the bike and see if it continues to get false neutrals or not.

It's a roll of the dice, maybe a $10 fix, maybe a $2k fix.
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Old 06-10-2019, 01:38 PM   #11
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That's a good price.

I'd make sure the lever is moving absolutely freely and take it for a spin. Make sure that shifts are made fully and completely and to be sure, do it hard on the gas and quickly. If it's going to pop out of gear, it'll do it then.

In the meantime, price some gears and shift forks and gaskets and stuff so you have an idea of what it would cost worst case to fix it.
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Old 06-10-2019, 02:32 PM   #12
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Typical list price for this 600 is over 6K so you have wiggle room since a whole running engine off Ebay only goes for 1.5K...
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Old 06-10-2019, 07:35 PM   #13
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That's easy. Somewhere between a $1 fix and $2.5k.
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Old 06-10-2019, 09:17 PM   #14
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He bought the bike, and it turns out he has more mechanic skills than i
thought.
He can do the work himself so even if he was to buy a motor he still would have gotten a good deal. If its a $1 fix as ernie states, he just cleaned up.
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Old 06-11-2019, 10:35 AM   #15
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Here's how to check your clutch for drag... your gears can't shift
smoothly if your clutch is part way engaged...

1 Place your bike on the center stand...

2 Start engine and establish a steady idle...

3 Squeeze in the clutch and hold... shift into first gear...

4 Check rear wheel to see if it's spinning... step on the rear brake...
does this action drag down the engine rpms??? thats extreme drag...

To adjust a cable equipped bike turn the small knob clock wise (out) 1/4 turn and
test for clutch drag... if your bike is equipped with hydraulics bleed system for bubbles...

Ultimately you want the rear wheel to coast to a stop when the engine is idling
and first gear selected with the clutch lever is squeezed in...
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