Swapping Sprockets from 70 to a 65?
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Your stock revlimiter is set at 5200 rpms IIRC.
If you still have the stock set up and aren't doing 100+ then I promise you aren't cranking too high.
That said if I was gonna change a sprocket to lower rpms in high gear I'd go with the Baker compensating sprocket and new primary chain so I didn't have to pull the inner primary. JMO
Ultimate HDF Member
Joined: May 2006
Posts: 6,590
Likes: 444
From: Ohio
Just ride it for a while, the bike will let you know what it needs.
BTW, we like pics.
Last edited by Beemervet; Mar 2, 2018 at 01:35 AM.
Ultimate HDF Member
Joined: May 2006
Posts: 6,590
Likes: 444
From: Ohio
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Be assured your bike and engine are just fine! By all means alter your gearing if you prefer, however there is no need to. Try ear plugs - best tuning aid known to man! And yes, that is a serious suggestion, I've been using them since the 1970s.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,114
Likes: 7,638
From: Poolville
I have found that gearing down to a 3.23:1 ratio is great overall. No lugging on take of and nice at 65-70..... If you change the rear to a 31/65 you will need a new belt...
Last edited by 98hotrodfatboy; Mar 2, 2018 at 05:40 AM.
Grand HDF Member
Joined: Aug 2008
Posts: 3,601
Likes: 9,915
From: Florida's gorgeous East coast
Great idea..!!
Absolutely...and no..I'm not trying to be funny either.
I love reading about altered gearing/ sprockets/pulleys/belts...etc,etc. Thanks to all who are sharing their thoughts and experiences even though sometimes working through all the numbers makes my brain hurt.
That said...every time I think about potential mods to my own ride (1985 FXRS)...I just stop myself with a reminder that she and I have shared 285,000 mi. of highway with her "drive parts" bone-stock. What do I think I'm gonna improve..???
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
I just picked up a 85 FLHTC and did the 65 from a 70 rear sprocket swap it amounts to around 300 or so RPMs in hi gear on the hi way - for me the 292 is the deal - instead of 3000 its 2700 much more user friendly
I used a dyna belt 133 tooth instead if the stock dresser at 136 and it fit like a glove
have done this quite a bit
I used a dyna belt 133 tooth instead if the stock dresser at 136 and it fit like a glove
have done this quite a bit
Intermediate
Joined: Aug 2014
Posts: 28
Likes: 0
From: Montana
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Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
I just picked up a 85 FLHTC and did the 65 from a 70 rear sprocket swap it amounts to around 300 or so RPMs in hi gear on the hi way - for me the 292 is the deal - instead of 3000 its 2700 much more user friendly
I used a dyna belt 133 tooth instead if the stock dresser at 136 and it fit like a glove
have done this quite a bit
I used a dyna belt 133 tooth instead if the stock dresser at 136 and it fit like a glove
have done this quite a bit
Yup, I did the same thing only havent tested it yet since the motor ain't done yet. 133T belt from a 91-99 Dyna and a 65T pulley from a 1995 Softail, spent less than $100 for all of it on eBay.
Stage I
Joined: Apr 2018
Posts: 1
Likes: 0
From: Grandview, Washington
I just picked up a 85 FLHTC and did the 65 from a 70 rear sprocket swap it amounts to around 300 or so RPMs in hi gear on the hi way - for me the 292 is the deal - instead of 3000 its 2700 much more user friendly
I used a dyna belt 133 tooth instead if the stock dresser at 136 and it fit like a glove
have done this quite a bit
I used a dyna belt 133 tooth instead if the stock dresser at 136 and it fit like a glove
have done this quite a bit
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easydoesit
Primary/Transmission/Driveline/Clutch
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Sep 23, 2007 07:31 AM
