:) :) :)
Hi
I have two A50/65 gearboxes and the clusters are different. I've not yet counted teeth but they are not the same.
So Question--Did any of the other unit construction bikes except A50/A65 series use the same gearbox set up with different clusters.
I'm aware that there is/was a close ration box and wonder if this is the difference.
I've heard this banded about a lot but confess that I haven't a clue about what is a close ratio box.
What are the differences in construction and what would be the difference in use..
Confused.lad
Mike 8)
Hi Mike - can't answer the specifics but a close-ratio gearbox is one where the "gaps" between gear ratios are relatively small - generally for competitive use. They tend to have a high 1st gear and then small "gaps" so that engine revs do not fall much on an upshift. Can be a pain in the ar&e in traffic. 500 Gold Star singles may be so equipped
Hi,
If you have a workshop manual there is a page that give the ratios and the numbers of teeth on the pinions. It is a matter of counting teeth to make sure. Otherwise they are the same.
Dave.
There were a number of changes made to the pre 1966 gear clusters to improve the strength.
You can see some details on the 2 parts bulletins below.
The 1965 season UK Lightning and Lightning Clubman used a close ratio cluster.
Pre 1966 box layshaft had a speedo drive worm attached.
These show the close and standard ration clusters for the 1965 season.