Just checked over at the Vtwin board. Extensive discussion at first about a possible hoax. Then interesting input from a HD tech. Some of it bears out the thought that many or most Dynas don't see 15K miles.
http://www.v-twinforum.com/forums/showpost.php?p=606613&postcount=40I'm a tech, and we did indeed get this letter.
I would not say that it is because HD has already found problems. Instead, it is because the Dynas (only), got a VERY modified primary. HD wants to keep an eye on what is happening in there.
Some of the changes:
1) No longer have to tension the primary chain, in fact, the door is not present on the outer primary. There is a spring loaded "auto tensioner". Suspect the MoCo wants to keep an eye on this.
2) The Inner Primary/ Starter interface has changed drastically. Previously, to remove starter, you had to pull the outer primary and unbolt the starter jackshaft. That no longer has to be done. In fact, there no longer is a starter jackshaft. Since something must protrude through the inner primary to mate with the clutch hub, the "seal" that was around the starter mainshaft will have changed. The Moco will want to keep an eye on how that is sealing.
3) No longer have locktabs on the inner primary bolts. They may want to keep an eye on this as well, but as long as locktited and properly torqued, this is minor.
Historically, inner primary leaks have plagued the MoCo. The last few years they have gotten better. My suspicion is that they just want to keep an eye on this new design to see how everything comes out. Being as it is NO cost to the customer (other than not having it for a day during the service) I think it is a good idea. Believe it or not, the VAST majority of HD buyers these days are not doing their own 5000 mile services. So this would be of no added annoyance to them. For those more sophisticated owners (many members of this forum, for example), can do the service themself, and then take it in for the primary changeout every 15,000 miles. (Don't spend money buy having changed your own primary fluid, though, cuz they'll have to do that during the service ).
I've never been a fan of the Dyna models, but if I was, I certainly wouldn't let this prevent me from buying one. If anything, the new closed loop EFI (requires 02 sensor in each exhaust head) would. Don't know of any aftermarket vendors yet who are providing any pipes that have a plug for the sensor to screw in yet. (But they WILL be coming!)
http://www.v-twinforum.com/forums/showpost.php?p=607014&postcount=42Here's another "point" that I didn't make in my previous post. I've been a tech for the last year and a half. Unfortunately, that means that I get to do WAY more PDIs and services than I'd prefer. But here's something interesting. I almost NEVER do a 10k service on a Dyna motorcycle. ANY model. I do lots of 1k services on them, and maybe the occasional 5k, but I bet I haven't done 3 10000 mile services on a Dyna in that 1.5 years. My point? There ain't gonna be that many 15000 mile services on Dynas, because they don't get ridden that far! I do services on touring bikes all the time that have way more than 10000 miles, but not many other models (even softails).
From what I've been seeing, doing a 15000 miles service on a Dyna is about equivalent to doing a 90000 mile service on an automobile where the timing belt and water pump is replaced.
Lastly, an inner primary job just isn't that difficult. On the current models, flat rate is under 2.0 hours. (It's 2.1 to change the rear belt which is doing some extra stuff.) From the changes that I've been seeing, I'm guessing it's only gonna be 1.5 hours for the '06 models. Just not that big of a deal.
Like I said, it wouldn't change my mind about buying one.