Vintage and Classic Hondas

I bow to supierior knoweldge on gearing O wise ones.

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Burro

I bow to supierior knoweldge on gearing O wise ones.

I believe the stock gearing for my 78 cb750F is 15/43 I have changed the front sprocket to a 14 and loved the change! I'm wondering if I change the rear to a 48 what my drive ratio will be and will I love a 14/48 as well? So far I think Honda way under geared this bike I still have mucho torque even after dropping the front sprock a tooth.

I'll believe that corporations are people when Texas executes one!

TOOLS1

Re: I bow to supierior knoweldge on gearing O wise ones.

Administrator

The smaller the front sprocket. The faster the takeoff will be,

but the top speed will be slower.

The opposite, for the rear. The larger it is, the faster the takeoff,

but the top speed will be slower.

So smaller front, and larger rear = lots of fun around town, and stoplight drag races,

but no fun on the highway.

TOOLS

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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
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Re-run

Re: I bow to supierior knoweldge on gearing O wise ones.

Administrator

In reply to this post by Burro

Also, 1 tooth change on the front is worth about 3 on the rear.

The ride IS the adventure. The destination is just to get gas!

Burro

Re: I bow to supierior knoweldge on gearing O wise ones.

I decided to go with a 17 front and 35 rear 530 chain conversion kit. Not quite the take off as before but I can leave it in first all the way up to 55mph until shifting at eight on the clock, doesn't feel faster, but does feel much less nervous of a bike.

I'll believe that corporations are people when Texas executes one!

LukeM

Re: I bow to supierior knoweldge on gearing O wise ones.

Administrator

These engines were meant to be revved (at least that's what I was told about the dohc models). Granted, one should not be tearing around at the red line all day, but running halfway between idle and red line is probably best. I'm sure the engineers tested many combinations of sprockets before deciding on the best compromise between economy and performance.
The bottom line? Find the ratio that suits your riding style. Remember with big changes to sprockets, you may need to remove or add links to the chain. Sounds like you're on top of that already. :-)

Luke M

Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.