This is a common issue with Stern’s Jurassic Park pinball machine. The shooter lane throws the ball into a vertical up-ramp delivering it to the right flipper, but in some cases it doesn’t reliably do so and it messes up the skill shots. Here’s a fix that is based on what appears to be a manufacturing defect with the playfields.
In this 2-part series I go over installing a shaker motor in a Stern Jurassic Park pinball machine. I also run into a few weird glitches with the hardware sent me. That’s the world of pinball… nothing ever goes 100% smoothly does it?
Lately there’s been a bit of a hullabaloo (is that how it’s spelled?) regarding coil stops on newer Stern games. I had it happen to me as well, and I made a video to describe what’s happening. It appears whoever is manufacturing the coil stops for Stern has used inferior materials and they prematurely come apart. I’ve reported this to Stern and will let you all know what they are doing about it. I expect this supply issue to be resolved soon and if you encounter this problem, contact Stern support. They should be able to send out replacement coil stops.
The next day I returned with the right parts. Here are two videos covering the repair.