Thanks, I thought 92 is very big as well, probably compensating for the exhaust leak, I found no others, and I did put the proline on without any sealant (just to see if simonini did any better job on the clamp then polini or tecno). It does run pretty well at WOT and the plug-chop looks just right, just very rich at idle.

I was originally set up for torque, 12.25:1 gears and estoril, top crank cut to malossi specs, and just the intake and mild port match done on the case, running jets in the mid 70s and topping out around 65km/h, 70 on a good day, 7-8k rpm… Then I had an unfortunate accident where the clutch blew up and put a hole in my foot (http://www.mopedarmy.com/forums/read.php?1,2715103,2718946) and broke the transmission cover around the bicycle-mode button. I took a break from this bike.

Meanwhile I decided that since I had to re-build another transmission I’d try taller gears and maybe get to 80km/h+. When I finally got the bike back together with new clutch, trans, and gears, I cracked my variator on something (still don’t know when/what, having too much fun) which bent the crank, which promptly snapped. So, over the winter I ported the cases close to the maximum, transfers and boosts all the way down to the crank lobes, and used an anticipato crank. I tried the biggest jet I had first, an 82. It four-stroked at idle (time to shave the slide), but still seemed lean at WOT, plug chop confirmed. Hitting 75km/h and only 6-7k rpm max, and the vario is not tuned in and variating fully yet. This is according to a TinyTach which I’m starting to doubt.

I figured 80s, but I got up to 98 just in case. I also finally got the proline so I installed that.

I tried the 80 first, lost power and top speed, felt lean but i did a chop anyway and it confirmed it, 90 was better and faster, but still looked lean. 98 felt rich, four stroking up most of the throttle, but would clear out at WOT. 94 was fastest so afar so I chopped and it looked a bit rich, so I went with the 92 and essentially got back to where I was with the estoril.

80s seems more reasonable with this much case work at sea-level…I’ll try some sealant and hopefully it will help.
I also tried lightening up the vario weights which got me a few more rpm and about the same top speed. I have heavier I might try, but I need to get/make some lighter ones, seems more likely it may be variating too early.

Thank You! That is exactly the kind of information I needed. Seems not many on either side of the pond run this cylinder, at least not people that bother to use a tach ;). I have to get some sleep before work, but I can’t wait to try some things tomorrow.
~M