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750b starter clutch compatability

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18 Feb 2021 08:11 #843656 by nk140
750b starter clutch compatability was created by nk140
I know this is beating a dead horse, but what starter clutches are compatible with the I have a 78 750b? I see the kz400 has the same part number. Any other starter clutches with different part numbers work? I replaced the pins, dowels, and springs but still have issues albeit a little better but still skips.

78 KZ750B

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18 Feb 2021 08:50 #843657 by 650ed
Replied by 650ed on topic 750b starter clutch compatability
What motor oil are you using? Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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18 Feb 2021 08:52 #843658 by nk140
Replied by nk140 on topic 750b starter clutch compatability
I am using 10W-40.

78 KZ750B

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  • DoctoRot
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18 Feb 2021 10:21 - 18 Feb 2021 10:29 #843664 by DoctoRot
Replied by DoctoRot on topic 750b starter clutch compatability
what state is the engagement surface on the sprocket in? if it has ridges from the rollers you need to have it machined as these sprockets are no longer available. When I rebuilt my 750b engine I polished all the surfaces lightly to remove any sharp edges that the rollers could get caught on. I also turned the sprocket engagement surface down .002" to remove the ridges and the starter worked perfectly, it was slipping before.


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Last edit: 18 Feb 2021 10:29 by DoctoRot.

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18 Feb 2021 10:31 #843665 by nk140
Replied by nk140 on topic 750b starter clutch compatability
I will remove it and take some photos. I know the starter clutch had some weird wear on it. I just got this bike and got it running the other day, but hate trying to kick start it. I was hoping to purchase another starter clutch to try.

78 KZ750B

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18 Feb 2021 12:23 - 18 Feb 2021 12:23 #843670 by 650ed
Replied by 650ed on topic 750b starter clutch compatability

nk140 wrote: I am using 10W-40.


That's fine, but what exact motor oil (not viscosity) are you using. There are 10w-40 oils that are fine and there are 10w-40 oils that are really bad for the bike. So what is the brand of the oil you are using and what is the exact type of oil within that brand? This is important since most brands offer different types of motor oil in the same weight. Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 18 Feb 2021 12:23 by 650ed.

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18 Feb 2021 13:05 #843674 by nk140
Replied by nk140 on topic 750b starter clutch compatability

650ed wrote:

nk140 wrote: I am using 10W-40.


That's fine, but what exact motor oil (not viscosity) are you using. There are 10w-40 oils that are fine and there are 10w-40 oils that are really bad for the bike. So what is the brand of the oil you are using and what is the exact type of oil within that brand? This is important since most brands offer different types of motor oil in the same weight. Ed


I am using valvoline 10W-40 specifically for wet clutch applications. I have always used this stuff or castrol oil for my older bike with no issues.

78 KZ750B

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18 Feb 2021 13:28 - 18 Feb 2021 13:30 #843676 by nk140
Replied by nk140 on topic 750b starter clutch compatability
How do you remove the starter clutch from the flywheel? The bolt heads are covered on mine. Is it installed upside down?


78 KZ750B
Last edit: 18 Feb 2021 13:30 by nk140.

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  • TexasKZ
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18 Feb 2021 16:15 #843681 by TexasKZ
Replied by TexasKZ on topic 750b starter clutch compatability
Can the Zephyr 750 starter clutch be adapted?

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24

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  • DoctoRot
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19 Feb 2021 09:37 - 19 Feb 2021 09:47 #843717 by DoctoRot
Replied by DoctoRot on topic 750b starter clutch compatability
Well I think you may have found your problem right there. That top cover has spun. the rollers are supposed to be completely covered and the bolt heads exposed. the rollers could be racking and getting jammed up because of that. it should look like this. IIRC this sheet metal piece is formed over a plate and its supposed to be one unit. If it spun you will need to weld it or something to keep it in place, or get a new clutch. what does the sprag gear surface look like?

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Last edit: 19 Feb 2021 09:47 by DoctoRot.
The following user(s) said Thank You: nk140

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19 Feb 2021 11:36 #843721 by nk140
Replied by nk140 on topic 750b starter clutch compatability

DoctoRot wrote: Well I think you may have found your problem right there. That top cover has spun. the rollers are supposed to be completely covered and the bolt heads exposed. the rollers could be racking and getting jammed up because of that. it should look like this. IIRC this sheet metal piece is formed over a plate and its supposed to be one unit. If it spun you will need to weld it or something to keep it in place, or get a new clutch. what does the sprag gear surface look like?


The sprag surface has some nice grooves. May need to have it machined or replaced. I did get the sprag off today. We had to really mess up the cover to get to the bolts. I will make it a kicker until I find a sprag.

78 KZ750B

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19 Feb 2021 18:09 #843747 by Scirocco
Replied by Scirocco on topic 750b starter clutch compatability

nk140 wrote: How do you remove the starter clutch from the flywheel? The bolt heads are covered on mine. Is it installed upside down?


Your starter clutch looks like to have a crack in the roller ramp....

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