Did you ever figure out the issue was? I just bought a 2010 RG in December and had to change the main drive gear and bearing and I noticed a slight vibration on deceleration and acceleration.

I haven't rode the bike much before the fix so I'm not sure if it's normal my 2001 road king doesn't do it but it has the 5 speed.

It feels like it's coming from the tranny or primary.

Thanks
John

 

The primary chain my be going through a harmonic vibration at that particular rpm range. The chain may tighten up a bit (if the OEM chain adjuster is installed).

 

Thank you I actually didn't even think of that. I bet it is that because it is intermittent not constant. I will have my mechanic ride it and see if he thinks that's what it could be if it does it for him. Thanks again

 

Could be mechanical for sure but not lugging the engine is great advice. I never let my Harleys run under 2000 rpm except for starting from a full stop. Even then I'll slightly rev the bike up from idle as I ease the clutch.

 

Guess I didn't specify enough it didn't matter what rpm it was at it's doing it at all rpm doesn't do it at cruising just acceleration and deceleration

 

Do you have the service records? Wonder if it still has the factory compensator. The factory did not upgrade the compensators until '11. The earlier compensators were right at their design limit with the 96 and 103 engines. A few lucky soles have had no trouble but many have had rattling noises, vibrations, and an loud metallic "crack" or bang when hitting the start button.

 

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Exactly what Mike & Pat said.

He's lugging the motor if you running at 1500-1800rpm in anything but 1st gear or short time/distance in 2nd at such low rpm.

When you run the bike in 1500-1800rpm range esp cruising in higher gears and apply throttle it will shake the bike until you get the motor into higher 2,300-2,400rpm+ range.

But it seems as though if he kept the bike 1 gear down/lower then he's currently using in same cond the extra hvy engine vibration he's concerned with should be gone.

Scott

 

You shouldn't be running in that rpm range except when accelerating from a complete stop.