update and a big thanks to fellow member rogue60
well here it is,i finally modded the muffler and with some help from a fellow member with some parts this new model 880 is an annimal,first the muff mod,this thing is badly restricted from the factory,with the 441 coil and the muff modd it was easy running 12,600 rpm wot,but seemed to be about it,so the intake boot was swapped for an 088/880 one because they have a larger diameter id,i found that by simply bolting an earlier carb on it will fit and work but the carb butterfly catches on the boot sleeve and wont return:bang:,
so once the bigger boot goes on and it does with no modds the older tilly ht carbs can be run ,i did find that the intake spigot is a bit smaller id and the port timing has been changed on the newer model but without pulling the jug its still a very different saw from stock,i have no doubts that even a little intake timing change will majorly improve it ,timing numbers are
ex 100,transfers 119,intake 67,stock,here's a few pics