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[laylonlor]

does anyone make a primary  cover  for the later big twins,that you can adjust and inspect your primary chain,.like the good old days,  before the mo/co  lost there fu***king common sence !!!

[North Georgia Hawg]

Just get a Hayden M7 and you'll never need to be concerned about your primary chain tension again. It will always be correct.

Ken

[Buckeye_Tuning]

Baker makes one for late model bikes. 

[grc]

Baker makes one for late model bikes. 

http://bakerdrivetrain.com/bully-primary-cover#

Comes in chrome, black, and wrinkle black.  Roughly $1300 for the chrome cover, or $1500 for the chrome cover with the manual adjuster kit.  I think I'd just do the Hayden tensioner.

Jerry

[skreminegul07]

HD left off the inspection /adjustment access when they introduced the self adjusting primary chain tensioner.  Nothing to adjust.

[joe_lyons50023]

I havent seen any issues with the latest revision of the auto tensioner after they fixed the ramp and teeth angle.

[Hx2]

Agree with the others, put in the auto tensioner and quit doing the adjustments. Went this route on my 99 and 03 bikes and was very happy.

[rocrider50]

Where's the link for the Hayden tensioner? 

[Fired00d]

Where's the link for the Hayden tensioner? 

When inquiring about vendors check our Vendor Discount Board  - The M6 Automatic Primary Chain Tensioner

 
Ride Safe,
Fired00d
 

[Black Diamond]

I havent seen any issues with the latest revision of the auto tensioner after they fixed the ramp and teeth angle.

When was the latest part put out?  I missed hearing anything on this one.  Thx.

JW

[Twolanerider]

Quite some time ago actually.  40063-05B.  I saw issues with the first one also.  Not sure I ever handled the A revision as it wasn't too short lived if I remember correctly.  The B revision has been out quite awhile and I've not had a problem with it.  It's in both the bikes here and was in the red bike.

[Black Diamond]

Quite some time ago actually.  40063-05B.  I saw issues with the first one also.  Not sure I ever handled the A revision as it wasn't too short lived if I remember correctly.  The B revision has been out quite awhile and I've not had a problem with it.  It's in both the bikes here and was in the red bike.

Ahh, I assumed this was something more recent.....you know what they say about assuming! 

JW

[grc]

When was the latest part put out?  I missed hearing anything on this one.  Thx.

JW

There have been three versions, the original plus two revisions.

40063-05  -  June 2005

40063-05A  -  November 2006

40063-05B  -  January 2010

The changes had more to do with the strength and durability of the actual tensioner (some early parts distorted and jammed), and the failure to engage the ratchet teeth properly that resulted in loose chains slapping the primary cover.  While the -B- revision seems to have "fixed" actual physical failures and jamming of the mechanism, I don't see anything in the changes so far that addresses the too tight problem.

If you think back to the old manual system on the previous design primary, the chain became tighter as the parts heated up.  The adjustment specs were 5/8-7/8" COLD, and 3/8-5/8" HOT.  In other words, the chain slack was reduced by 1/4" as the parts came up to full operating temperature.   I don't see anything in the current design "auto" tensioner that allows for that tightening of the chain as the parts heat up.  So while the actual tensioners themselves may no longer fail with the latest revision level, the issue of overtightening doesn't appear to have been addressed.  All that extra stress on the chain and other components wasn't unknown to Harley, they had issues before they sold the first Dyna with the new system in 2006.  They originally planned to require a mandatory change of the IPB at 15k miles, and had early purchasers sign a form acknowledging that requirement, but halfway through the model year they dropped the requirement when the initial failure rate wasn't quite as bad as they feared.  Of course we have been hearing about plenty of IPB failures ever since, but Harley has obviously determined that it's cheaper to fix the ones that fail within the warranty period than it is to address the design issues that are the root of the problem.  After all, the average Harley probably doesn't go 2000 miles in a year, so all the MoCo has to worry about is the people who actually rack up some major miles.

JMHO of course - Jerry

[djkak]

...
All that extra stress on the chain and other components wasn't unknown to Harley, they had issues before they sold the first Dyna with the new system in 2006.  They originally planned to require a mandatory change of the IPB at 15k miles, and had early purchasers sign a form acknowledging that requirement, but halfway through the model year they dropped the requirement when the initial failure rate wasn't quite as bad as they feared.

JMHO of course - Jerry

I believe that the early ’06 Dyna 6-speeds were manufactured with transmission and primary housings that were not dowelled together. When the mainshaft support bearings of these early machines failed, the repair included an updated transmission and inner primary housing.

[Kathy]

Take a look at the M6BT07 at http://Haydensm6.com and cure your primary chain adjusting once and for all. No need to spend money on a new primary cover with an inspection hole. We've been doing this almost 25 years and believe me, we've for lots of these out there. Remember, we're here to help.