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Kz750 twin won't shift into 3rd
- Stocky
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11 Jan 2016 12:28 #706335
by Stocky
Kz750 twin won't shift into 3rd was created by Stocky
Hi, after a lengthy rebuild I finally got my bike oout for my first test ride.
I can comfortably sift from 1st to second ok but can't shift up any further. Runs nice and clutch feels good.
When I rebuilt the engine I didn't change anything in the gearbox part from cleaning and visually inspecting for any wear etc.
It all seemed ok so was re assembled as original.
Is there any thing to check or test before I take the sump off and check the gear / selector assembly. Very frustrating after thinking every thing was good when assembled.
Any help would be appreciated.
I can comfortably sift from 1st to second ok but can't shift up any further. Runs nice and clutch feels good.
When I rebuilt the engine I didn't change anything in the gearbox part from cleaning and visually inspecting for any wear etc.
It all seemed ok so was re assembled as original.
Is there any thing to check or test before I take the sump off and check the gear / selector assembly. Very frustrating after thinking every thing was good when assembled.
Any help would be appreciated.
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- bountyhunter
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11 Jan 2016 13:47 #706343
by bountyhunter
1979 KZ-750 Twin
Replied by bountyhunter on topic Kz750 twin won't shift into 3rd
It could be a shift fork. The factory manual has some good info on the tranny. You'll need a manual if you don't already have one.
1979 KZ-750 Twin
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- SWest
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11 Jan 2016 17:07 #706376
by SWest
Replied by SWest on topic Kz750 twin won't shift into 3rd
Bad shift selector spring behind the tranny cover?
Steve
Steve
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- Stocky
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11 Jan 2016 17:52 #706379
by Stocky
Replied by Stocky on topic Kz750 twin won't shift into 3rd
Thanks Bounty hunter. I've read through the service manual which as you say has a lot of info. I couldn't see any thing obviously damaged or bent etc when I reassembled it.
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- Stocky
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11 Jan 2016 17:54 #706380
by Stocky
Replied by Stocky on topic Kz750 twin won't shift into 3rd
Thanks swest , do you know if there's any way to tedt changing through all the gears with the side cover off.
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- SWest
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11 Jan 2016 18:36 #706384
by SWest
Replied by SWest on topic Kz750 twin won't shift into 3rd
There are two springs under there. One big one on the lever shaft and the other on the shift ratchet. You can tell if they're broken. Also the shift drum pins might have a problem. There's a small spring on the detent arm too. It's the cover behind the sprocket.
Steve
Steve
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- Stocky
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14 Jan 2016 18:34 #706731
by Stocky
Replied by Stocky on topic Kz750 twin won't shift into 3rd
Hey thanks guys, after checking I found I had installed the shift return Spring incorrectly. Now going changing through all gears with no problems.
Another big step toward completion. Getting close now , can't wait to get on the road. After the test ride I found a small oil leak at front of head. Maybe need to re torque head nuts?
Blood , Sweat and Beers!
Another big step toward completion. Getting close now , can't wait to get on the road. After the test ride I found a small oil leak at front of head. Maybe need to re torque head nuts?
Blood , Sweat and Beers!
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- Stocky
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14 Jan 2016 18:35 #706732
by Stocky
Replied by Stocky on topic Kz750 twin won't shift into 3rd
Pic of bike before road test.
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- SWest
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14 Jan 2016 18:39 - 14 Jan 2016 18:40 #706733
by SWest
Replied by SWest on topic Kz750 twin won't shift into 3rd
Cool.
Steve
Steve
Last edit: 14 Jan 2016 18:40 by SWest.
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- TexasKZ
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15 Jan 2016 02:22 #706746
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic Kz750 twin won't shift into 3rd
The head should be retorqued after the very first heat cycle after reassembly, and again after the first 500 miles.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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