I bought a Polini 70cc cylinder kit for a 1978 Yamaha Chappy LB50. I also bought the Puch hi compression head. I just installed them. Everything fits great. My only problem is that it seems that I might need a spacer/standoff for the cylinder studs. I have the nuts threaded all the way down and there is still approximately 15mm of bare unthreaded stud left. I've attached a photo so you can see what I mean.
My initial thoughts are +/- 15mm of washers or some kind of standoff/spacer to occupy that space so i can torque down the head properly.
My question is, have any of you seen this before and do you have any resolution?
Thanks so much