Those are not the bumper mounts. If you look close the stock bumper mounts are there. What you are seeing are the silver alum anti-roll bar mounts by GPM.
I was able to get 4 tanks thru it this past weekend. It is easy to start with the pull so I am glad I did not put in the rotostart. I really like it. In fact, if I had gotten the SS before I got my Maxx, I probably would have never gotten the Maxx.
The needles were set at the factory settings as shown in the little S-25 manual that came with the kit.
Page E-5.
High Speed Needle 4.5 turns from closed
Low Speed Needle 3 turns from closed
My temps ranged from 190 to 210 during the 4 tanks. First tank was run at idle only. I let the engine cool between tanks completely making sure the piston was at bottom dead center. I will run another 4 or 5 tanks using the settings above then start the tuning process.
Took a little to start it the first time. Got easier on the second tank. On the third and fouth tank it started on the first pull once I got the fuel to the carb.