Topic: What sprocket size you running? CB750

[brandEn]

At the risk of getting flamed I am asking... What size sprockets/gearing you using?

After a few miles on my new build I am thinking the 17T front 48T rear with 630 chain is in need of a change. I don't anticipate much slab time with this bike so I am thinking about changing sprockets size for a bit more pep. Thoughts? Input?

[Gordon]

Going with a smaller rear sprocket will do the opposite of giving the bike more "pep".  You either need a smaller front sprocket or larger rear (or a combination of both) to increase the low-end torque.

[brandEn]

Ah, thanks for the clarification. Now that I think about it that makes sense. Thats why those stunt bikes have those huge rear sprockets.

fixed...

[tweakin]

Dude,  Why don't you at least get more than 50 miles on the thing before you think about changing the gearing.  J/K, 

edit: you are worse than me...

At the risk of getting flamed I am asking... What size sprockets/gearing you using?

After a few miles on my new build I am thinking the 17T front 48T rear with 630 chain is in need of a change. I don't anticipate much slab time with this bike so I am thinking about changing sprockets size for a bit more pep. Thoughts? Input?

[brandEn]

haha, 50 miles? How bout 79.3! Yea get some!

[brandEn]

 And by the way...nobody is worse than you!
 

[wookie]

Break your motor in, get it tuned properly and then think about gearing.  I run a 17/48 520 with no complaints.

J

[Don R]

Way back in the olden days we used a 17 on the front for performance, sometimes with a 50 rear then an 18 / 48 for highway use. If we were pushing a windjammer or a lot of weight we left the 17 on all the time

[MCRider]

The 17/48 combo is usually with a 530 chain. The increase in size to a 630 drops the number of sprocket teeth front and rear. Sure we're talking about the same thing?

In my opinion 17/48 is the best al around compromise, as the stock setup was 18/48. You could go to a 16/48 but you'd be turning alot of revs at highway speeds. Increasing the rear may foul the chainguard, if you're running one.

Wookie: I didn't know there was a 520 conversion either. Sources?

[brandEn]

The 17/48 combo is usually with a 530 chain. The increase in size to a 630 drops the number of sprocket teeth front and rear. Sure we're talking about the same thing?

In my opinion 17/48 is the best al around compromise, as the stock setup was 18/48. You could go to a 16/48 but you'd be turning alot of revs at highway speeds. Increasing the rear may foul the chainguard, if you're running one.

Wookie: I didn't know there was a 520 conversion either. Sources?

Thanks for the input. Yes I am running JT sprockets 17 up front and 48 rear with a 630 DID chain. What ratio is that comparable to with a 530 chain?

[MCRider]

If in fact you have a 17/48, its the same ratio as any other 17/48. The chain size doesn't change the ratio. But your sig says its a 78 750F and they came with a 14/43 using a 630 chain, which is "more power" than a 17/48 ratio.

[wookie]

The 17/48 combo is usually with a 530 chain. The increase in size to a 630 drops the number of sprocket teeth front and rear. Sure we're talking about the same thing?

In my opinion 17/48 is the best al around compromise, as the stock setup was 18/48. You could go to a 16/48 but you'd be turning alot of revs at highway speeds. Increasing the rear may foul the chainguard, if you're running one.

Wookie: I didn't know there was a 520 conversion either. Sources?

Yeah, it was something that cycle x offered at one time.  O-ring chain, decent quality, so far so good.

J

[MCRider]

SNIP
Wookie: I didn't know there was a 520 conversion either. Sources?

Yeah, it was something that cycle x offered at one time.  O-ring chain, decent quality, so far so good.

J

Cool. No reason a modern 520 can't be used. Such a conversion is hot setup on HawkGTs (I have one) and many make a lot more hp than our CBs ever will.  Much lighter.

[TaylorG]

Hmm, I got my 750f running and replaced the rear sprocket and chain with what I thought was the stock sprocket combo: 14/43 630 chain.  I road tested the bike and gearing seems way off.  I'm in second before I'm out of first and at 60, the RPM's are screaming!  Should I look at a new gearing combo?  17/48?  Or do I have another problem?  With the exception of a leaky carb, bike starts, runs and sounds great.  Any thoughts from the forum would be really appreciated. 

[754]

 I am sure its 530 chain, if you have 17/48

 17 /54 is fun on the street, just change to 19 for longer distances..

 Any 530 can be switched to 520, just thin the sprockets..

[Spanner 1]

17/48 K1 750 @ 60 mph 5th. gear = exactly 4,000 rpms....... nice

[Tripps]

?Stock?  78 750K, 4200 at 60 mph.

[Spiider]

17/48 with a 530 chain.