Heritage 6 speed transmission
Our 6 speeds are a 14% overdrive that's about 500 rpm's at 70.
Club Member
Joined: Aug 2008
Posts: 22,867
Likes: 17,924
From: Lafayette, Louisiana
Mark,
Is there a minimum amount of engine torque / horsepower Baker recommends for an Evo to be able to run an OD6 or DD6 well? I have seen maximum numbers quoteded which indicate the OD6 being better for high horsepower / racing applications but was wondering if there was an established minimum? I know it's pretty much accepted that a bone stock Evo with stock jetting and lame N grind cam isn't up to the task, but how much more is enough?
Is there a minimum amount of engine torque / horsepower Baker recommends for an Evo to be able to run an OD6 or DD6 well? I have seen maximum numbers quoteded which indicate the OD6 being better for high horsepower / racing applications but was wondering if there was an established minimum? I know it's pretty much accepted that a bone stock Evo with stock jetting and lame N grind cam isn't up to the task, but how much more is enough?
Mark,
Is there a minimum amount of engine torque / horsepower Baker recommends for an Evo to be able to run an OD6 or DD6 well? I have seen maximum numbers quoteded which indicate the OD6 being better for high horsepower / racing applications but was wondering if there was an established minimum? I know it's pretty much accepted that a bone stock Evo with stock jetting and lame N grind cam isn't up to the task, but how much more is enough?
Is there a minimum amount of engine torque / horsepower Baker recommends for an Evo to be able to run an OD6 or DD6 well? I have seen maximum numbers quoteded which indicate the OD6 being better for high horsepower / racing applications but was wondering if there was an established minimum? I know it's pretty much accepted that a bone stock Evo with stock jetting and lame N grind cam isn't up to the task, but how much more is enough?
The OD6 is 165
Last edited by corliss@bakerdrivetrain.com; Aug 23, 2016 at 08:01 AM.
Cruiser
Joined: Jan 2016
Posts: 101
Likes: 9
From: Massachusetts
Can you choose a taller mainshaft 5th gear, something with a lower ratio? I don't know if it's possible at all, but maybe Andrews makes something.
Would be an option alternative to the larger belt pulley or whole 6 speed transmission.
I rebuilt my 5 spd trans last summer on my 2005 FLSTN deluxe.
I lost drive and it turned out to be that the original belt pulley had prematurely worn splines. Damndest thing. I used a Baker transmission rebuild kit while I was in there. Trans didn't need it per se, but since I had to replace the main drive gear (it meshes with the belt pulley), I figured why not.
Point is, I got pretty familiar with the guts.
Maybe changing 1 gear out is an option? Worth looking into.
Would be an option alternative to the larger belt pulley or whole 6 speed transmission.
I rebuilt my 5 spd trans last summer on my 2005 FLSTN deluxe.
I lost drive and it turned out to be that the original belt pulley had prematurely worn splines. Damndest thing. I used a Baker transmission rebuild kit while I was in there. Trans didn't need it per se, but since I had to replace the main drive gear (it meshes with the belt pulley), I figured why not.
Point is, I got pretty familiar with the guts.
Maybe changing 1 gear out is an option? Worth looking into.
Thread Starter
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Advanced
Joined: Feb 2013
Posts: 52
Likes: 0
From: New Lisbon Wi
Well, reducing rpm by only 500 it don't thinks is going to make much of a difference regarding vibration. Either I slow down to 65 (GD forbid, don't want to get run over!) or look at maybe changing grips and pegs! Thanks for all the information. I am interested in boosting horse power. I have replace the exhaust, rebuilt and jetted the carb, replaced the factory air cleaner. Now need to work on coil. Not sure what cam to use.
Cruiser
Joined: Jan 2016
Posts: 101
Likes: 9
From: Massachusetts
A new cam will make big power gains. Much more so than what you've done so far, combined. I installed a 0.510" lift, S&S 510G gear-driven cam set in my 05 Softail TC88 this year, and as often said, it "woke the bike up". I had already had the stage 1 (Thunderheader 2-in-1 exhaust, K&N, dynojet kit, tuned, etc) for years, and it was an ok upgrade from stock, but a cam is another league. It will leave you pretty satisfied, at least for a while.
I got lucky, because I probably didn't do as much research, and ask questions, as I should have. I was primarily looking to ditch the cam chains and tensioners and folks with stock 88s were talking up my choice. There are many choices, some are totally inappropriate for the heads, valves and springs you likely have in your bike, so be careful.
The ones that match are still numerous and they have different signature envelopes, etc. There are good primers here to check out.
I got lucky, because I probably didn't do as much research, and ask questions, as I should have. I was primarily looking to ditch the cam chains and tensioners and folks with stock 88s were talking up my choice. There are many choices, some are totally inappropriate for the heads, valves and springs you likely have in your bike, so be careful.
The ones that match are still numerous and they have different signature envelopes, etc. There are good primers here to check out.
Thread Starter
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Advanced
Joined: Feb 2013
Posts: 52
Likes: 0
From: New Lisbon Wi
Thanks for the cam info. Friends have told me that's the way to go! Makes quite a difference in horse power. Mine is a stock 93 80ci. Went on the Screaming Eagle site. Its confusion on what to choose. I'm not looking for a dragster. There are a few cams to chose. Not sure what would be best for the highway driving. Would not like to sacrifice too much light to light either!
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Road Captain
Joined: Jun 2010
Posts: 604
Likes: 22
Vibes
My .02 for what it's worth. Send your engine bottom end to Darkhorse and get it balanced. My first bike was a, new to me, 1980 FXWG that shook you to death. Had no previous experience and didn't know any better but got tired of the shake, rattle, and roll. Word of mouth was the mode of info then and was turned on to Lake Shore, HD. Sent them the engine and had a 90" motor built. Couldn't believe it was the same bike. Could see out of the mirrors, hands didn't fall asleep, feet stayed on the pegs. Money well spent and was able to pull the tall gearing I had installed trying to make the vibes more tolerable. Just had Darkhorse do my 08 Crossbones and it's so smooth it turned into my favorite bike but it is a counterbalanced engine. You may find you don't need a new tranny.