Author Topic: Jumps out of 2nd on deceleration  (Read 1470 times)

Offline xjs36uk

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Jumps out of 2nd on deceleration
« on: April 16, 2015, 07:12:36 am »
Can anyone put a definative finger on this before I strip the engine.

Engine is fine, runs starts, idles superbly. Clutch action is good, no slips, vibes. Transmission is smooth, engages gears positively, no false neutrals, no clunks, vibes etc. Redlines in every gear no problems.

The only issue I have is that on deceleration after hard acceleration in second (only second) she will jump out of gear.

Mark, One half of the "Formation Crashing Greaves Brothers".    1986 GTR1000 A1, 1988 GTR1000 A2, 1989 GPZ900R A3, 1986 GPZ1000RX A1, 1983 GT750 P3, 2000 ZX12R-A1, 1990 ZZR1100 C1, 1986 CBR500, 1985 XT500, 1987 XJS 3.6, 1995 XJ6 3.2 Sport, 1992 XJ40 4.0S, 1987 Capri 3.0S,1993 Xantia 1.9TD, 1993 W124 250D, 1999 S210 E280 4-Matic, 1996 LDV400, 1999 P38 2.5 DSE. I think I have a problem......

Offline RFH87_Connie

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Re: Jumps out of 2nd on deceleration
« Reply #1 on: April 16, 2015, 11:44:29 am »
I had a similar (or opposite) situation with an '82 Honda Silverwing (GL500).  Perhaps it is almost the same thing you are having.  At about 150k miles it would pop out of 2nd on hard acceleration.  I tore the engine down and found a combination of two things.  The shift forks were slightly bent and the dogs that engaged the gears were getting rounded off.  I could buy new forks but the gears were obsolete.  I used a Dremel tool to re-square them up and it still runs great to this day.

I would definitely wait for a good answer or additional suggestions before proceeding.  If it is the trans, it may be easier to just find another used engine and swap them.  Otherwise, the parts could probably be found on eBay at a fair price.  It's a big job though.
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Offline xjs36uk

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Re: Jumps out of 2nd on deceleration
« Reply #2 on: April 19, 2015, 05:41:46 am »
Thanks RFH87

Guess you were right there, dogs on output shaft 5th and receptors on 3rd are pretty well rounded. Ah bugger, and I was hoping not to have to split the crankcase again!
Mark, One half of the "Formation Crashing Greaves Brothers".    1986 GTR1000 A1, 1988 GTR1000 A2, 1989 GPZ900R A3, 1986 GPZ1000RX A1, 1983 GT750 P3, 2000 ZX12R-A1, 1990 ZZR1100 C1, 1986 CBR500, 1985 XT500, 1987 XJS 3.6, 1995 XJ6 3.2 Sport, 1992 XJ40 4.0S, 1987 Capri 3.0S,1993 Xantia 1.9TD, 1993 W124 250D, 1999 S210 E280 4-Matic, 1996 LDV400, 1999 P38 2.5 DSE. I think I have a problem......