so I have had a chance to get out a few times, tach set up now. First off, the only 50 kph I hit is downhill, on flats in 3rd i'm in the mid 40s. vibration is really low on the bike, I don't feel much until I'm hitting the upper 9k to 10k range. the tach is a nice thing to have, worth the $25 I think.
the jackshaft sandwich is running great, when going over everything I noticed one of the js sprockets set screw had loosened just a bit, but with my sandwich there is zero lateral movement. I did use normal strength thread locker but I guess I'll have to use the permanent stuff. I was trying to run the math on my rpm but came up with 58 kph at 5k rpm in 2nd gear, which sounds way too high. I'm running engine 10T, js in 17T, js out 10T, big crank 44T, smaller crank 36T, 3 spd 21T. apparently 2nd is 1:1, then 1st is 3/4 that and 3rd 4/3.
I also found finally found my neoprene handlebar boots I bought a couple years ago and never got to use, they're awesome. I don't have to wear big bulky gloves, and hand stay out of the rain and wind.
starting is a little better, I added an extension to the nt carbs choke so reaching down. Now I at least only have to start it once, but I need to look at the clutch. slips sometimes when kickstarting, and lever is well set, so I may have to adjust flower nut. I need to refresh myself on the clutch again anyways.
I ran on oily gas for the first bit, I don't know the ratio but definitely fuel lean compared to my usual 100:1. Now I have a new batch (just over 50 ml of opti2 to 5 L of gas). I know all the controversy over this, I have read the mega thread here or there (cant remember which site). I've read up a bit on the jennings 2 stroke book and other write ups on the subject. I do it because I can, it's a hobby for me. the only reason I have an mb is for fun, and that fun is not just saddle time. so tinkering and trying things out is apart of it all, and I've learned alot by just trying things. if I kill the topend on a ride, I will have to lock it up and come back for it (unless I'm close to home). a whole new topend is 15 min and $30ish away, I think it's a reasonable risk. and all that being said, the last motors latest topend ran 100:1 the whole time from day one. the pics showing the piston, show it's looking pretty good condition after many miles. still running strong, and that engine lived WOT. I never cruised part throttle, I did lend it out as a commuter for a few months and I don't know how many miles or how it was driven. I still plan on a crank swap for that engine to see if I can get rid of the midrange vibes.
this engine is getting better, but doesn't feel broken in yet. on the 70 jet and bottom notch until its broken in. running well, but I should do a chop. I'm also getting more used to riding with the js, feels like I would like a bigger spread of gearing but I'll see later. Intake is back to no cover at all, I'm using one of the stock filters plastic grids, cut be wide open in front of carb intake. that grid holds on a big hard rubber ring about a 1/2 deep that holds the rain sock material in place.
once it's broken in, I'll play with carb and exhaust. to be honest I really like my exhaust, to me it looks the part for my hobby bike. it runs well but I might drill a couple holes in the can to modify the putput sound of idle. the bike is quite quiet, I have to lean back and turn my head to hear the exhaust over the intake. the carb I will try the sha clone to see if I like it better, the choke has a cable to handlebar lever which is nice. intake length is tricky, not a lot of room for a longer one unless I go side ways. I've got a new cnc head waiting for break in as well, I will do a compression test on this one when I take it off, then do the new one to compare. I will also shorten my plug wire then, I also have a couple plugs lying around to try.
once I "finish" working on this one I can tear down the other engine to swap the crank. then put that on the bike so I can tear down the new engine and clean it up.