'99 Sportster - vibrating when accelerating
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Cruiser
Joined: Aug 2007
Posts: 131
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'99 Sportster - vibrating when accelerating
After about 250 miles of ownership in 2 weeks, today I noticed the engine vibrating harder than before under throttle, and is actually uncomfortable at 60-70mph. It only happens when I'm accelerating; idle is ok, no vibes when coasting or under engine braking, or rolling at speed in neutral. Any thoughts as to the cause? I'm going to pull the plugs tomorrow to see if one is fouled.
Cruiser
Joined: May 2008
Posts: 200
Likes: 1
From: tennessee
RE: '99 Sportster - vibrating when accelerating
I doubt its your plugs or it would be noticeable at any speed even idle I would check my engine mounts also look for signs of the motor touchin the frame it sounds like tarnsfer to me good luck
Road Captain
Joined: Mar 2007
Posts: 667
Likes: 0
From: Valatie NY
RE: '99 Sportster - vibrating when accelerating
do you have headbolt covers on, they were the cause of a similar issue i had with my carbed 2000 when the motor got up and running and they caused a short or something due to the heat of the covers messing with the spark it was a waste of 50$
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