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6 speed tranny's for Harley's

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  • fun4now
    replied
    The question is, why do I WANT to keep up with the KawaYamaSuzukda's?
    exactly, the harly was never intended to run with the croch rockets and if you are trying to you obveously bought the wrong bike.
    even if you were to spend the $$ to get the speed of the suzukie out of your harly you would never have the handiling ability of the suzukie, or the breaking power. so all it would only take is a few curves and you would eather be left behind or worse left in a ditch.

    if you feel the torque is there to pull the trailor without any truble then no point in waisting the $$.
    it sounds like you got a harly to ride like a harly so no point in messing with the extra gears.

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  • Trent Combs
    replied
    I recently (last week) picked up a 2007 FLTR Road Glide, 96CI and 6 speed. Box stock with the full CA emmissions package, it runs very strong from 3-5K rpms. 4000 rpms in 4th is 80mph. 6th is a cruising gear, not worth having below 70 mph. 1st and 5th are straight cut gears, all the others are helical (sp?) cut. Straight is stronger but noisier. 1st for starts, 5th for passing.

    There is no way I'd put a 6 speed on a 80, or an 88 for that matter. Lugging these motors kills power AND fuel mileage. That's why HD only put 6 speeds on Dynas last year - the lighter bike was OK with it on the 88.

    You are right to stay with the 4 speed INHO, given the way you ride. Of course, you could go with a 5 and just use 1, 3 & 5.........

    Leave a comment:


  • burninbriar
    replied
    Originally posted by harcosparky View Post
    Back in the days when the BMW twins only had 27 HP, and 4 gears they were toting driver, side car, and two passengers. I remember a friend I used to ride with, he and his wife on the bike, a kid and gear in the side car. That little BMW did the job. 25 years later he still has that black BMW and side car. This was back when a 750cc was a BIG BIKE!
    Thats pretty cool, I bet that BMW is probably worth more now than it was then.

    Leave a comment:


  • harcosparky
    replied
    Originally posted by burninbriar View Post
    76 speed ?
    I agree it could come in handy totin heavy loads, but with 100 plus CI engines I don't know that it would be nessessary. I've toted some heavy loads with mine and its just 80 CI. remember this photo ?
    I'm definately more of a cruzzer than a racer. Love those bikiny beaches.
    Back in the days when the BMW twins only had 27 HP, and 4 gears they were toting driver, side car, and two passengers. I remember a friend I used to ride with, he and his wife on the bike, a kid and gear in the side car. That little BMW did the job. 25 years later he still has that black BMW and side car. This was back when a 750cc was a BIG BIKE!

    Leave a comment:


  • PUMPKINHEAD
    replied
    Originally posted by harcosparky View Post
    You'll need all the help you can get just to try and keep up with the Suzukis.
    The question is, why do I WANT to keep up with the KawaYamaSuzukda's?

    Leave a comment:


  • burninbriar
    replied
    Originally posted by fun4now View Post
    i would think the 76 speed (if geared propery) would be an advantage if you were intending to pull a trailor with it, especily if mountans were involved. nothing like croozzzzzing the mountains for great views. i have ridden from florida to NY on several ocations and have to say the pensilavinea mountains was about the best part of the trip, well the bikinies in Fl. were not too bad eather.
    the 6 speed could be set up to give you much better towing. it realy depends on what you want out of the bike and what you are willing to do (and spend ) to get it. if i was going to be pulling a trailor i would want the extra gears, you could always skip a few when not towing.
    76 speed ?
    I agree it could come in handy totin heavy loads, but with 100 plus CI engines I don't know that it would be nessessary. I've toted some heavy loads with mine and its just 80 CI. remember this photo ?
    I'm definately more of a cruzzer than a racer. Love those bikiny beaches.
    Attached Files

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  • fun4now
    replied
    i would think the 76 speed (if geared propery) would be an advantage if you were intending to pull a trailor with it, especily if mountans were involved. nothing like croozzzzzing the mountains for great views. i have ridden from florida to NY on several ocations and have to say the pensilavinea mountains was about the best part of the trip, well the bikinies in Fl. were not too bad eather.
    the 6 speed could be set up to give you much better towing. it realy depends on what you want out of the bike and what you are willing to do (and spend ) to get it. if i was going to be pulling a trailor i would want the extra gears, you could always skip a few when not towing.

    Leave a comment:


  • burninbriar
    replied
    Originally posted by harcosparky View Post
    Yes final drive ratio change is the easiest and least expensive, but it affects performance in all gears. I would imagine the extra gear or two would act as an 'overdrive' for highway use, leaving the final drive ration alone leaves lower gear performance intact, while adding an extra gear or two would give you more flexibility.

    Having the extra gear and not needing it is better then needing it and not having it. I have a Suzuki with a 6 speed tranny - rarely does it get out of 4th but when hit the interstate those gears are nice.
    Thats why I changed my 1st and second, I'm giveing it a wider range of rpm. 1st will end up virtually the same as stock and 4th will lower my rpm by 300 at 75 mph.
    I guess with belt drives you are some what limited as to what you can do so I might see an argument there.

    Leave a comment:


  • harcosparky
    replied
    Originally posted by burninbriar View Post
    Adding more gears is not the only way to lower the rpm. I lowered mine 300 rpm just with a final drive sprocket change.

    Yes final drive ratio change is the easiest and least expensive, but it affects performance in all gears. I would imagine the extra gear or two would act as an 'overdrive' for highway use, leaving the final drive ration alone leaves lower gear performance intact, while adding an extra gear or two would give you more flexibility.

    Having the extra gear and not needing it is better then needing it and not having it. I have a Suzuki with a 6 speed tranny - rarely does it get out of 4th but when hit the interstate those gears are nice.

    Leave a comment:


  • burninbriar
    replied
    Originally posted by moe1942 View Post
    The point missed is extra gearing means lower RPM's which equate to longer engine life. The extra gearing evolved due to interstate travel. Plus there is no law that says you have to use all six gears all the time.

    Those who are more mechanically inclined will understand what I have said..

    Stick with your three speeds and keep that puppy wound tight.
    Adding more gears is not the only way to lower the rpm. I lowered mine 300 rpm just with a final drive sprocket change. With all the the available horse power the Rpm range could easily be covered through 4 speeds and eliminate skipping gears as you mentioned. Like I said earlier, I end up skipping gears with my 4 speed, if I had a 6 speed I would be skipping 2 at a time. The first 5 is just bringing it up to direct drive like the 4 speeds.
    I like Bulldogs explanation so far, it makes the most sence.
    By the way, they do make 3 speed drag transmissions, I just don't know any one useing them.

    Leave a comment:


  • harcosparky
    replied
    Originally posted by moe1942 View Post
    The point missed is extra gearing means lower RPM's which equate to longer engine life. The extra gearing evolved due to interstate travel. Plus there is no law that says you have to use all six gears all the time.

    Those who are more mechanically inclined will understand what I have said..

    Stick with your three speeds and keep that puppy wound tight.
    You don't understand these " harley " types. Lower RPM = Lower Exhaust Noise. They need em wound tight to be LOUD !!!!


    Side Note - I own a Harley - fully restored STOCK 1972 XLH 1000 - not ridden much if at all - it's a Harley after all!

    Leave a comment:


  • burninbriar
    replied
    Originally posted by Bulldog View Post
    Hey Pete,
    The need for a six speed comes in when the engine builder builds an engine with a very narrow power band. Some guys like a cam that is quick reving and builds power real fast so you get super quick acceleration but with that you loose power quick as well so time to grab another gear. Now on your mostly stock 80 incher that has a cam that builds nice power over a real wide range, if you were going to go after some ricers you would most definitely need to change the cam and rework the heads, change the rods and get that 6 speed. In 94 I won the Easy Rider horsepower shootout with my 80 incher and Skeeter Todd on the seat from Easy Rider(121hp at the tire). This thing would eat CBR 600s, but was no match for the CBR 800's.
    Good luck,
    Bulldog
    Thanks Bulldog;
    Thats the kind of stuff I was after. I was thinking along the lines of a heavy load or pulling a trailer, but I've been loaded very heavy with my 80-CI 4-speed and pulled a trailer,(not at the same time though ) and did just fine with 4. On the speed end only, it would seem that unless you plann on 300 mph, 6 speads is not really needed.
    The only argument I would have with you're explanation,( and it is a factless argument since I never ran a big inch 6 speed ) Is that you would wast too much time shifting gears to keep it in a narrow rpm range to win races.
    How tight of a power band can you really get on a big inch Harley ?

    I did recam mine, first with an ev-46 then changed to an ev-13 witch I like a lot better. Its more of a dresser style cam, a lot of low and mid range performance. I'm also running 10 /1 pistons but that is not by design, thats all I could get in a 15 thousanth over (long story, I think I have the last set in existance) , I wanted to keep a low compression. The 10 / 1 pistons CCed to only 9.3 / 1 when it was finnished so I'm OK with that.

    Leave a comment:


  • moe1942
    replied
    The point missed is extra gearing means lower RPM's which equate to longer engine life. The extra gearing evolved due to interstate travel. Plus there is no law that says you have to use all six gears all the time.

    Those who are more mechanically inclined will understand what I have said..

    Stick with your three speeds and keep that puppy wound tight.

    Leave a comment:


  • harcosparky
    replied
    Originally posted by cruizer
    On the lower displacement engines like your puny harley, true there isn't much point getting the 6spd, though on my IronHorse texas chopper running a 124 CI with alotta extra torque and zoom power it's nice to have the extra gears.....
    You'll need all the help you can get just to try and keep up with the Suzukis.

    Maybe you could rip a 13 speed tranny out of a Kenworth!

    Leave a comment:


  • bob_e95482
    replied
    I have a RevTech 4 spd in my '73 84 in. shovel. I have it overgeared (48t vs 51t rear). Cruises good. A little slow off the line, but worth the tradeoff to me. The OD is to lower RPM while cruising. My 4 1/2" stroke gives me enough torque to overcome the gap between 3rd & 4th. My $.02.

    Leave a comment:

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