My 90 vibes the most at 60mph and smooths out at
70 mph. Id say at 70mph it no worse than my dyna was.

 

Well, here's one guy who swears by them. When Harley rebuilt my Softail engine back in '02, it shook so badly compared to the original motor that I nearly sold it in disgust. With little to lose, I bought the balance master balancer and installed it on the sprocket shaft. It smoothed the engine right out, just like the old one.

Ten years later, the balancer is still in there, and I'm still riding the bike. It's pretty smooth from 50 up to 75 MPH in top gear.

 

Surprisingly enough, timing has had the most noticeable effect on vibration. I have a 94 fxstc that has Wiseco 10.1 pistons, aluminum pushrods, ev27 cam, along with a six speed transmission and an M-6 chain tensioner in the primary. Rubber isolated handlebar risers, and shaker foot boards. Also, have a saddleman seat with gel inserts. I ride all day, hundreds of miles. No problem. BUT, when I recently finished the top end, I re-timed the bike. Only moved the advance slightly, yet the effect on vibration was huge. If your bike has not ben tuned recently, I would put it on my must do list.

 

Thanks Jethro. I recently (3 weeks ago) had the heads ported and polished, plus an S&S breather reed valve installed, but did not get the bike tuned. The Bike had been dyno tuned a year prior and was running great. The vibration issue started after the head work and breather reed valve was installed.

Is there a possibility of damaging the engine by continuing to ride it as is?