Question about Harley Davidson FLTR-FLTRI Road Glide Motorcycles

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My local HD dealer just installed a HD race tuner, a air cleaner kit and a set of Vance+Hynes true dual exhaust and dyno-tuned on my 2008 Road Glide, $1600.00 parts+labor . I bought the bike from them used in the Spring of 2010 and have put on 4000 trouble-free miles this past Summer., the bike is in imaculate condition. I picked up the bike and got halfway home and noticed a very noticble vibration at any RPM coming from the motor. I brought it back and they checked the obvious, motor mounts etc.. They are telling me that the exhaust is making it vibrate and there is nothing they can or will do.

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Take it to another dealer. Dealers usually will not warranty any type of performance work. I find it difficult to see why the exhaust would cause the vibration. Just make sure the exhaust is supported properly to the frame. I would however suspect the race tuner. If the tuner is not adjusted correctly it will cause the engine to run poorly. It may even cause the engine to overheat. I'd suspect the igniton timing. Take it to another dealer or to an aftermarket that has a "good dyno man".

Now, there are two types of dyno-tunes. One, is actually not a dyno tune but more of a dyno run up. Regrettfully, this is what most dealers do. They install a bunch of stuff and then put your bike on the dyno, run it up, and get a print out of the horsepower and torque, that's it. This is simply a run up. The charge us usually about $35 - $50 or so.

Now a true dyno tune is totally different. The run up is just the beginning to establish a baseline. Then changes are made to your race tuner, intake, fuel map, timing settings, and exhaust to get the highest horsepower and torque out of your bike. You are usually charged "X" amount of dollars to begin with and then some much per hour. I've seen a good dyno man work on a bike for several hours changing jetting and such on the bikes and believe me, if the guy does what he's supposed to do, you can feel the difference. Bad part is a "good dyno man" is very hard to find.

Good Luck

Posted on Nov 08, 2010

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