Torque dip .. suggestions?
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
Totally agree that the OP needs to find a new tuner first and get a proper tune first. A good tuner can sort the tune out and will also be able to tell if the clutch is slipping during the tune.
If clutch slip remains to be suspect the OP has a couple of options. OEM clutch pressure spring is 280# for '06 and later models; '99-'05 spring is 320#. Don't know the OPs model year but if running the 280# spring, no way will it hold that power; maybe the earlier 320# spring will but maybe not at peak. Cheapest way to check clutch action would be to install the SE "heavy duty" green spring; at 380# and see if it makes a difference. If it does, the AIM VPC clutch hat with the SE 380# spring would be a good combination with decent lever pull as the heavy spring holds lower rpms and the hat acts as a lock up as the rpms increase. At $295, it ain't cheap but won't break the bank.
If clutch slip remains to be suspect the OP has a couple of options. OEM clutch pressure spring is 280# for '06 and later models; '99-'05 spring is 320#. Don't know the OPs model year but if running the 280# spring, no way will it hold that power; maybe the earlier 320# spring will but maybe not at peak. Cheapest way to check clutch action would be to install the SE "heavy duty" green spring; at 380# and see if it makes a difference. If it does, the AIM VPC clutch hat with the SE 380# spring would be a good combination with decent lever pull as the heavy spring holds lower rpms and the hat acts as a lock up as the rpms increase. At $295, it ain't cheap but won't break the bank.
Stellar HDF Member
Joined: Mar 2012
Posts: 2,008
Likes: 596
From: Columbus, OH
I completely agree with all the advice given at this point, Diagnose the problem before you start throwing parts at it. The best way to do that is get it back on the dyno with a competent operator
OP your location says Indiana. You are probably not far from one of the best tuners in the country who resides in Evansville, I live in central Ohio and take my bikes to him
OP your location says Indiana. You are probably not far from one of the best tuners in the country who resides in Evansville, I live in central Ohio and take my bikes to him
Thread Starter
|
Intermediate
Joined: Jan 2020
Posts: 47
Likes: 0
From: Indiana
I completely agree with all the advice given at this point, Diagnose the problem before you start throwing parts at it. The best way to do that is get it back on the dyno with a competent operator
OP your location says Indiana. You are probably not far from one of the best tuners in the country who resides in Evansville, I live in central Ohio and take my bikes to him
OP your location says Indiana. You are probably not far from one of the best tuners in the country who resides in Evansville, I live in central Ohio and take my bikes to him
Stellar HDF Member
Joined: Mar 2012
Posts: 2,008
Likes: 596
From: Columbus, OH
Thread Starter
|
Intermediate
Joined: Jan 2020
Posts: 47
Likes: 0
From: Indiana
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
Sure you can, try shifting at high RPMs.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Stellar HDF Member
Joined: Sep 2017
Posts: 2,133
Likes: 570
From: memphis
yep...and as max stated..try shifting while twisting the R's in the upper rpm range as this has been my experience.