6speed tranny on a twin cam 88
#2
Try reading previous threads, like this one...
https://www.hdforums.com/forum/touri...n-a-hurry.html
https://www.hdforums.com/forum/touri...n-a-hurry.html
#4
#6
#7
The following 2 users liked this post by sbeast:
Bayou FLHR-M8-128" (03-13-2022),
Firebike32 (03-13-2022)
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#8
...... that was on the diff. btwn the 4 & 5 speeds on the FLT's introduced in 1980
>> The biggest complaint about the 4-speed was universal throughout the years — most everybody thought the bike needed another gear.
In 1980, Harley introduced the FLT series motorcycle, a fairly revolutionary bike in Harley history. A rubber-mounted engine with a 5-speed gearbox was the major design change. For many years, riders thought an additional gear in the transmission would be ideal. Harley listened, but what many riders didn’t understand is that the final drive ratio of the 4-speed and the 5-speed was the same 1 to 1. Many erroneously believed that the 5th gear was an overdrive. The lower gear ratios in 1st, 2nd, & 3rd allowed the engineers to raise the overall gear ratio to achieve the same off-the-line performance with a higher top speed.
Today’s higher road speeds have prompted requests for yet another gear. Harley introduced its 6-speed cruise drive transmission in 2006. The changes in the overall gear ratio are what made this unit a positive upgrade to the Harley gearbox. However, it’s not as refined as some of the aftermarket transmissions that are available today. Baker, Jim’s Machine, RevTech and Milwaukee Twins all produce overdrive gearboxes. These new transmissions feature a high gear that is .86 to 1 or .80 to 1 — less than the stock 1 to 1, resulting in a reduction in engine rpm at a given speed, or a faster speed at the same rpm.
.... from J&P
.... http://blog.jpcycles.com/2010/07/har...-alternatives/
>> The biggest complaint about the 4-speed was universal throughout the years — most everybody thought the bike needed another gear.
In 1980, Harley introduced the FLT series motorcycle, a fairly revolutionary bike in Harley history. A rubber-mounted engine with a 5-speed gearbox was the major design change. For many years, riders thought an additional gear in the transmission would be ideal. Harley listened, but what many riders didn’t understand is that the final drive ratio of the 4-speed and the 5-speed was the same 1 to 1. Many erroneously believed that the 5th gear was an overdrive. The lower gear ratios in 1st, 2nd, & 3rd allowed the engineers to raise the overall gear ratio to achieve the same off-the-line performance with a higher top speed.
Today’s higher road speeds have prompted requests for yet another gear. Harley introduced its 6-speed cruise drive transmission in 2006. The changes in the overall gear ratio are what made this unit a positive upgrade to the Harley gearbox. However, it’s not as refined as some of the aftermarket transmissions that are available today. Baker, Jim’s Machine, RevTech and Milwaukee Twins all produce overdrive gearboxes. These new transmissions feature a high gear that is .86 to 1 or .80 to 1 — less than the stock 1 to 1, resulting in a reduction in engine rpm at a given speed, or a faster speed at the same rpm.
.... from J&P
.... http://blog.jpcycles.com/2010/07/har...-alternatives/
Last edited by groupw; 02-15-2016 at 09:17 PM.
The following users liked this post:
Bayou FLHR-M8-128" (03-13-2022)
#10
what bugs me about the 4 speeds is the jump from 3rd to 4th, hit a hill in 4th and your lugging, drop to 3rd and the rpm is to high. The 5 that replaced the 4 addressed that issue.
A 6 without OD will do nothing for your top gear cruise rpm unless you address the final drive ratio like the newer bikes have, but they have the cubes to pull that ratio, an 88 inch not so much. make sure you do your homework when playing with gear ratios.
A 6 without OD will do nothing for your top gear cruise rpm unless you address the final drive ratio like the newer bikes have, but they have the cubes to pull that ratio, an 88 inch not so much. make sure you do your homework when playing with gear ratios.
The following users liked this post:
N2 Motorcycles (03-11-2022)