Do all hobbit cases have those ridges or what

Nick Haber /
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So I've owned several hobbits for 7 years now, but I've always had pa50i's. I've always dremeled off the little nubs on the cases before kitting since everyone with a pa50i knows you can't bolt up a kit without doing that. Well I got a pa50ii motor I was rebuilding and lo and behold it has the same notches in it. The DR kit on this bike clears fine, see the pic. I am 99.9% sure this motor is a pa50ii due to the crank, variator, and reedblock all being a pa50ii part. the motor has also never been apart cause these case screws weren't demolished and I destroyed 4 of them even with a JIS impact driver.

So what gives? Is this some sort of weird bike that some dude switched the crank, variator, and intake setup on back in the day before the case screws turned to cheese? Or do all hobbit cases have these nubs? I took apart a pa50i I had laying around and it looks identical.

Pic of the DR kit clearing the nubs with ease. Are the stock hobbit cylinder skirts just longer? No need to Dremel down these nubs with kits? I also vaguely remember being able to tell by the engine serial number if the cases are pa50i or pa50ii, I attached a pic so I could double check that when I remember how you tell based on that.

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