Originally Posted by 5150northrider
So is this the last year for the 103/110 twin cam? Why would they keep putting it in there bikes if it was such a bad design? Both my wife and I have the 110 motor in our bikes and both of us would like to keep them. We trusted Harley Davidson when we spent the $$$ and we both really like our bikes. Do you guys think they will switch to the m8 across the line next year or like me believe it will take some time?
Well they built the 110 for 9 years in the CVO. There are design issues with it. The 110 requires to much valve spring pressure, and the lifters fail. Part of it is the angle of the push rods.
The 110 is notorious for Lifter failure. My 09 CVO Road Glide had lifter failure at 46K miles, 3 years old. My 15 CVO Road Glide Ultra had catastrophic lifter failure at 43,800 miles, right at 2 years old. Motor replaced under warranty.
One of my best friends had the motor replaced on his 15 CVO Road glide ultra with 36K at 18 months old for the same thing, lifter failure. A friend had lifter failure on Mt Rainer, we had rode out from TN, his was 14 CVO limited.
Check the CVO forum, you will find many more, the ones above are friends I ride with.
HD knows the issue, but they figure most 110's will be years out of warranty before they fail. So they kept making them. Average rider is less than 10K a year, so the bike is out of warranty when it fails.
I like the 110 motor in-spite of the issues. I have owned four, and still have one. The one I have will not have lifter failure. I built the motor, I have AV&V beehive valve springs which do not bind as much or create as much pressure as the HD double springs. I have woods Alpha directional lifters in it, which are much better than HD lifers.
My advice is check lifters after 20K miles.
I think the Twin cam will be phased out soon. EPA rules will cause this. They are just using up inventory in my opinion.