Hello guys, I heard this here the best screwdrivers give their opinions. But now to my problem: had got me at the beginning of the season nee CB 400 N for my girlfriend, it was called (private purchase) that the engine in warm condition easily Klattert… At home arrived, gasoline and new oil on it, and fired off. For the first time nee round around the village. After a scarce hour the flap was unbearable and she also didn’t pull right. Of course the valve game once looked at… was very different… the But still there! It got stronger with increasing speed! I then removed the cylinder head and found out that the left piston had a game of almost 2mm to the right. After complete disassembly of the engine the truth opened up. The left pleul had separated from its bearing shells (well no oil got) Pleul shimmered in all rainbow colors. Well, I got new crankshaft with pleuln over E-Bay nee (one without running tracks) and from the dealer new bearing chalen and + new pistons. Wanted to put everything back together because my first real problem! How were the counterweights arranged to the crankshaft? From the crankshaft two smaller weights run with a chain opposite the crankshaft. Well after hours of long airwork and strained memory and good hope I screwed the engine together again. The other morning I put the engine under the moppet, connected everything and hoped… Ignition ON, Empty uf inside, starter starts… Nix … Choke pulled ^^ button pressed … engine runs … and runs after about 5 min I give a bit of gas, from 1500 tours it starts to get unpleasant to vibrate and increases to the top. At 8000 the teeth start singing. ^^ One of the little ones fell out of the chain when I moved the engine (due to lack of space on the table)! So how do the weights get so installed that the engine no longer vibrates? On the weights there are two markings TC u nd HC. And on the crankshaft is also a mark! But which comes to where? With greetings Michael P.S. Is it a disease of the engine series that the left cylinder dies over the course of life?