I also have been hearing a plastic bumping noise when I hit large bumps. I am wondering if it is my GIVI hugger hitting the under side of the rear fender. I looked under the fender and at the hugger and do not see anything that looks like a rubbing or hitting.
I have the preload set on 2 and I weight a 190 lbs with maybe 20 lbs in my saddle bags/trunk/underseat.
Ive just replaced my fibreglass hugger with the Givi one, it was destroyed by the bike being softer due it being lowered and bottoming out regularly. I replaced the standard sprung with a progressive Hyperpro one and it has made all the difference. Only installed the give one today and havent had a ride out yet, bit looking at it, I don't expect it to be an issue.
Lowering links increase the mechanical advantage, making the suspension relatively softer. There is only about 1-1/8" maximum extra space before the tire begins to hit the fender. Lowering 3/4" plus sticking a hugger in there is likely not to provide enough room. The hugger is probably hitting the fender. I doubt if you have enough preload dialed in. Each end should sink about 40mm under full load compared to full suspension extension with the wheel off the ground.
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