Topic: Sprockets

[Sitarz84]

What kind of sprockets should I get with a 530 chain?

Right now I have a 630 chain

[cabrala]

Sprockets in relation to which bike!?!? Why don't you let us know what you're saddling first? Then, while waiting for replies here, do some solo research and look at a parts fiche to determine a stock setup (motogrid.com).

Finally, use the Google Custom Search on this site (upper left of page) to search for 530 chain setups for your particular CB. I'm not certain if sprocket teeth will change due to different chains, but my newbie senses tell me it could be possible with changes in pitch.

Good luck,

[lucky]

What kind of sprockets should I get with a 530 chain?

Right now I have a 630 chain

A 17T-43T  would be very close to stock for the 1977-78 CB750.
But if you want high cruising speeds (65+) at lower rpm I would go with a 17T-40T combo.

You can get them at Yamatoya Motorsports. If you call them they will help you.

[Sitarz84]

1977 cb750f is what I'm riding...

[Sitarz84]

What kind of sprockets should I get with a 530 chain?

Right now I have a 630 chain

A 17T-43T  would be very close to stock for the 1977-78 CB750.
But if you want high cruising speeds (65+) at lower rpm I would go with a 17T-40T combo.

You can get them at Yamatoya Motorsports. If you call them they will help you.

So the 17T-43T will work with a 530 chain?

[MCRider]

What kind of sprockets should I get with a 530 chain?

Right now I have a 630 chain

A 17T-43T  would be very close to stock for the 1977-78 CB750.
But if you want high cruising speeds (65+) at lower rpm I would go with a 17T-40T combo.

You can get them at Yamatoya Motorsports. If you call them they will help you.

So the 17T-43T will work with a 530 chain?

Its not the number of teeth that determines whether it will fit with your chain. You need 530 sprockets for 530 chains, regardless of the number of teeth. Its the width of the sprocket and distance between the pins.

Find the ratio of the 630 sprockets you have (14 and 43 are stock for your bike) is 3.07. To match that with 530 sprockets you'll need a 16t and a 48t (=3.0).

You may find that a 17/48 is comfortable. But you buy the sprockets for the chain size.

In makeing your switch from 630 to 530, i think you have to change your rear wheel drive plate as well. There are plenty of thread discussions on this.

All the usual suspects sell sprockets: motogrid; parts n more; CMSNL; Bike Bandit, etc.

[Sitarz84]

What kind of sprockets should I get with a 530 chain?

Right now I have a 630 chain

A 17T-43T  would be very close to stock for the 1977-78 CB750.
But if you want high cruising speeds (65+) at lower rpm I would go with a 17T-40T combo.

You can get them at Yamatoya Motorsports. If you call them they will help you.

So the 17T-43T will work with a 530 chain?

Its not the number of teeth that determines whether it will fit with your chain. You need 530 sprockets for 530 chains, regardless of the number of teeth. Its the width of the sprocket and distance between the pins.

Find the ratio of the 630 sprockets you have (14 and 43 are stock for your bike) is 3.07. To match that with 530 sprockets you'll need a 16t and a 48t (=3.0).

You may find that a 17/48 is comfortable. But you buy the sprockets for the chain size.

In makeing your switch from 630 to 530, i think you have to change your rear wheel drive plate as well. There are plenty of thread discussions on this.

All the usual suspects sell sprockets: motogrid; parts n more; CMSNL; Bike Bandit, etc.

I have no idea what a drive plate is. I guess I'll be learning something new shortly.

thanks for giving me the sizes I need.

[MCRider]

The drive plate is the part of the rear wheel to which the rear sprocket is bolted. It is removable. The drive plate on the bikes like yours that came with 630 chain/sprockets sticks out more (or less, I'm not sure) that the drive plate on earlier bikes that carried the 530 chain/sprocket combo.

My understanding from reading threads of those who have made this conversion, is that you must change this drive plate as well so the sprockets will line up front to rear.

[scottly]

The drive plate is the part of the rear wheel to which the rear sprocket is bolted. It is removable. The drive plate on the bikes like yours that came with 630 chain/sprockets sticks out more (or less, I'm not sure) that the drive plate on earlier bikes that carried the 530 chain/sprocket combo.

My understanding from reading threads of those who have made this conversion, is that you must change this drive plate as well so the sprockets will line up front to rear.

This is true when fitting an early motor in a late frame. With the late motor in the late frame it won't be an issue.

[MCRider]

The drive plate is the part of the rear wheel to which the rear sprocket is bolted. It is removable. The drive plate on the bikes like yours that came with 630 chain/sprockets sticks out more (or less, I'm not sure) that the drive plate on earlier bikes that carried the 530 chain/sprocket combo.

My understanding from reading threads of those who have made this conversion, is that you must change this drive plate as well so the sprockets will line up front to rear.

This is true when fitting an early motor in a late frame. With the late motor in the late frame it won't be an issue.

Aah, thank you.

[lucky]

What kind of sprockets should I get with a 530 chain?

Right now I have a 630 chain

A 17T-43T  would be very close to stock for the 1977-78 CB750.
But if you want high cruising speeds (65+) at lower rpm I would go with a 17T-40T combo.

You can get them at Yamatoya Motorsports. If you call them they will help you.

So the 17T-43T will work with a 530 chain?

You get #530 sprockets for # 530 chain. See how it works?

#530 is the pitch( distance between teeth or chain links).

[lucky]

What kind of sprockets should I get with a 530 chain?

Right now I have a 630 chain

A 17T-43T  would be very close to stock for the 1977-78 CB750.
But if you want high cruising speeds (65+) at lower rpm I would go with a 17T-40T combo.

You can get them at Yamatoya Motorsports. If you call them they will help you.

So the 17T-43T will work with a 530 chain?

Its not the number of teeth that determines whether it will fit with your chain. You need 530 sprockets for 530 chains, regardless of the number of teeth. Its the width of the sprocket and distance between the pins.

Find the ratio of the 630 sprockets you have (14 and 43 are stock for your bike) is 3.07. To match that with 530 sprockets you'll need a 16t and a 48t (=3.0).

You may find that a 17/48 is comfortable. But you buy the sprockets for the chain size.

In makeing your switch from 630 to 530, i think you have to change your rear wheel drive plate as well. There are plenty of thread discussions on this.

All the usual suspects sell sprockets: motogrid; parts n more; CMSNL; Bike Bandit, etc.

Change the drive plate??? Do not know what you are talking about.

What is a drive plate?
All I have ever done is take off the old #630 sprocket and put on the new #530 sprocket. Done.

[MCRider]

Drive plate = sprocket carrier.

As to need, Scottly already explained it up above.

[scottly]

A 17T-43T  would be very close to stock for the 1977-78 CB750.

No where near close! 

[lucky]

A 17T-43T  would be very close to stock for the 1977-78 CB750.

No where near close! 

The 1977-78 CB750's had a higher 4th and 5th gear ratios than the earlier models.
I mentioned the 40 T rear sprocket if you drive on the freeway a lot.

The final gear ratios for the F model were 1.133:1 4th gear and 0.969:1 5th gear.
The final gear ratios for the K model were 1.097:1 4th gear and 0.939:1 5th gear.

Starting Engine #
CB750FE-2500004       F1
        new camshaft, carbs w/additional idle air. New pistons, compression ratio 9.2/1. New case w/o primary chain oiler. Final drive gear ratio 43/50 i/o 48/50. 4th gear on main shaft 31 i/o 30, 5th gear on countershaft 31 i/o 32

[scottly]

K7 was 15/41= 2.7333. 17/43= 2.529. 17/40= 2.352.

[lucky]

K7 was 15/41= 2.7333. 17/43= 2.529. 17/40= 2.352.

You are right Scottly!  I stand corrected.

The OP has a 1977 F model but since we do not know the engine number it will be hard to recommend the best ratios for his bike without further info.

[lucky]

K7 was 15/41= 2.7333:1    17/43= 2.529:1    17/40= 2.352:1

Less confusing to me.

[bollingball]

A 17T-43T  would be very close to stock for the 1977-78 CB750.
scottly +1 not close

The drive plate on the bikes like yours that came with 630 chain/sprockets sticks out more (or less, I'm not sure) that the drive plate on earlier bikes that carried the 530 chain/sprocket combo.
 Out 10mm to line up with the front.

Change the drive plate??? Do not know what you are talking about.
 No surprise here. Think potatoe pototoe

Sitarz84  Lots of good advice here. Just be carefull with any thing that starts with L. Like length of chain. Can you read between the lines?
Ken
 

[scottly]

I believe the late Fs were 15/43 = 2.866
17/48= 2.823

[lucky]

Scottly...Do you know the final sprocket ratios for the K8?

[lucky]

A 17T-43T  would be very close to stock for the 1977-78 CB750.
scottly +1 not close

The drive plate on the bikes like yours that came with 630 chain/sprockets sticks out more (or less, I'm not sure) that the drive plate on earlier bikes that carried the 530 chain/sprocket combo.
 Out 10mm to line up with the front.

Change the drive plate??? Do not know what you are talking about.
 No surprise here. Think potatoe pototoe

Sitarz84  Lots of good advice here. Just be carefull with any thing that starts with L. Like length of chain. Can you read between the lines?
Ken

My 1978 K8 did not have a drive plate.

[lucky]

A 17T-43T  would be very close to stock for the 1977-78 CB750.
scottly +1 not close

The drive plate on the bikes like yours that came with 630 chain/sprockets sticks out more (or less, I'm not sure) that the drive plate on earlier bikes that carried the 530 chain/sprocket combo.
 Out 10mm to line up with the front.

Change the drive plate??? Do not know what you are talking about.
 No surprise here. Think potatoe pototoe

Sitarz84  Lots of good advice here. Just be carefull with any thing that starts with L. Like length of chain. Can you read between the lines?
Ken

Ok...I made a mistake.
How much mileage can you get out of it? Cheeeeeessssshhhh!

[scottly]

Ok...I made a mistake.
How much mileage can you get out of it? Cheeeeeessssshhhh!

You've made 9 worthless posts so far on this thread. How much more mileage can YOU get out of it?

[MCRider]

A 17T-43T  would be very close to stock for the 1977-78 CB750.
scottly +1 not close

The drive plate on the bikes like yours that came with 630 chain/sprockets sticks out more (or less, I'm not sure) that the drive plate on earlier bikes that carried the 530 chain/sprocket combo.
 Out 10mm to line up with the front.

Change the drive plate??? Do not know what you are talking about.
 No surprise here. Think potatoe pototoe

Sitarz84  Lots of good advice here. Just be carefull with any thing that starts with L. Like length of chain. Can you read between the lines?
Ken

My 1978 K8 did not have a drive plate.

It didn't have a sprocket carrier either.

1978 K microfiche calls it a "flange, final driven". = potatoe = pototae = potato