83 GPz750 Jumping out of second gear

jsuwinski · 4 Weeks Ago

Has anyone experienced the transmission jumping out of second gear into neutral on a GPz750?

All the gears shift great, but every once in a while, normally under engine breaking, second just jumps to neutral.

Any ideas what's the cause or the fix?

CaliGPZ · 4 Weeks Ago

My '82 does this as well but only under hard engine decelleration. If I romp on it in second and then back off quick, she will jump back into neutral. Kind of a pain...Not sure what the cause is or the fix. My bike has 42K on it. May have had a rough childhood!

jsuwinski · 4 Weeks Ago

Sounds like the very same problem as me ...

steell · 4 Weeks Ago

Sounds like the edges of the shift dogs may be rounded.
I have a 550 transmission handy so I'll try to take a pic to illustrate later tonight.

kopcicle · 4 Weeks Ago

Engine out , case split , replace at least two gears . Steell or I can point you at the parts diagram or in his case actual photos . This is common for a transmission that has been abused .

~kop

ratvespa · 4 Weeks Ago

Quote:

Originally Posted by kopcicle

Engine out , case split , replace at least two gears . Steell or I can point you at the parts diagram or in his case actual photos . This is common for a transmission that has been abused .

~kop

and also be happy you are not on a yamaha from the 80's, they are known for completely loosing 2nd gear. I always found it funny that yamaha would never admit to that problem, and so many of their bikes from the 80's had that problem.

CaliGPZ · 4 Weeks Ago

Crap, not what I wanted to hear. Guess I will live with it untill it gets so bad I gotta fix it!!

kopcicle · 4 Weeks Ago

Quote:

Originally Posted by CaliGPZ

Crap, not what I wanted to hear. Guess I will live with it untill it gets so bad I gotta fix it!!

Fix it . So bad you have to fix it results in bent shift forks , mangled shift mechanism and the possibility of bits of hardened steel gear teeth attempting to find their way at minimum through the gear clusters and at worst toward daylight .

~kop

kopcicle · 4 Weeks Ago

refer to the manual and or a competent parts/service person for the correct parts . You may think that it is mainshaft and countershaft 2nd gear but that is not the case . Mahap Steell could enlighten you as I've run out of time ..

~kop

4 Weeks Ago	#1 (permalink)
jsuwinski Ol' Time GPz750 Join Date: Sep 2008 Location: The twisty bits in Northern CA Posts: 22	83 GPz750 Jumping out of second gear Has anyone experienced the transmission jumping out of second gear into neutral on a GPz750? All the gears shift great, but every once in a while, normally under engine breaking, second just jumps to neutral. Any ideas what's the cause or the fix? __________________ -- Cheers, John 83 GPz750-A1 81 CB900c ("Bobber" project)

4 Weeks Ago	#2 (permalink)
CaliGPZ Newbie Join Date: Aug 2009 Location: SoCal Posts: 13	My '82 does this as well but only under hard engine decelleration. If I romp on it in second and then back off quick, she will jump back into neutral. Kind of a pain...Not sure what the cause is or the fix. My bike has 42K on it. May have had a rough childhood! __________________ CaliGPZ 1982 KZ750R1 1973 RD350 (and a bunch of dirt bikes)

4 Weeks Ago	#3 (permalink)
jsuwinski Ol' Time GPz750 Join Date: Sep 2008 Location: The twisty bits in Northern CA Posts: 22	Sounds like the very same problem as me ... __________________ -- Cheers, John 83 GPz750-A1 81 CB900c ("Bobber" project)

4 Weeks Ago	#5 (permalink)
kopcicle obstification engineer BTK Expert Join Date: Aug 2004 Location: Bonney lake WA Posts: 1,823	Engine out , case split , replace at least two gears . Steell or I can point you at the parts diagram or in his case actual photos . This is common for a transmission that has been abused . ~kop __________________ 91 KZ1000 POLICE 84 ZN1300 Battlestar Gigantica 79 XS650 Cox Glow Fuel 75 RD 250 Grenade

4 Weeks Ago	#7 (permalink)
CaliGPZ Newbie Join Date: Aug 2009 Location: SoCal Posts: 13	Crap, not what I wanted to hear. Guess I will live with it untill it gets so bad I gotta fix it!! __________________ CaliGPZ 1982 KZ750R1 1973 RD350 (and a bunch of dirt bikes)

4 Weeks Ago	#4 (permalink)
steell This space for rent BTK Expert Join Date: May 2009 Posts: 291	Sounds like the edges of the shift dogs may be rounded. I have a 550 transmission handy so I'll try to take a pic to illustrate later tonight.

4 Weeks Ago	#9 (permalink)
kopcicle obstification engineer BTK Expert Join Date: Aug 2004 Location: Bonney lake WA Posts: 1,823	refer to the manual and or a competent parts/service person for the correct parts . You may think that it is mainshaft and countershaft 2nd gear but that is not the case . Mahap Steell could enlighten you as I've run out of time .. ~kop __________________ 91 KZ1000 POLICE 84 ZN1300 Battlestar Gigantica 79 XS650 Cox Glow Fuel 75 RD 250 Grenade Last edited by kopcicle : 4 Weeks Ago at 07:01 PM.

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