Alright gents I need a couple extra opinions on my current situation. I can't get my bike to start again after it died a few months back. It was running fine on a new engine rebuild until I turned into the bar and it sputtered and died. I figured it was low on fuel and didn't bother with it. When I went to leave I couldn't get it to start. It hasn't started since. I have: New fuel new petcock new fuel line new spark plug Checked for spark(has spark on spark tester and when holding plug to head) Top end is fresh(new piston/rings/valves/seals/tensioner/cam chain etc less than 8 engine hours ago) Checked cam chain, cam timing, valve clearance(all in spec) Checked wiring Cleaned the carb thoroughly ( tore it down completely and had it dunked over the weekend by the local machine shop) Attempted bump starting (the bike only locks the back tire, I need a bigger hill) pulled cylinder off and checked valves/piston. Everything looks fine. New coil Swapped cdi with ebay xr400 cdi that was stated as pulled from running bike I'm working in a 70 degree shop so temp is not an issue. After the carb cleaning it would periodically fire 3-4 revolutions then die. Barely more than the spin of the kick. Starting fluid has no effect other than raising the amount of backfires. I swapped on my recently rebuilt HS40 Carb (mikuni tm40) to see if it was still a plugged pilot circuit. No change except it will fire 3-4 revolutions every other kick now. I think that is because the accelerator pump allows me to toss fuel in. I didn't want to add another variable(new carb) but I wanted to rule out the stock carb as the issue. So my thinking is that it could be one of a few things: Unlikely: Loss of compression(it is still more difficult to kick than before rebuilt so it appears to have compression) CDI(only failure symptoms I can find say that there is no spark with a dead cdi, I have spark so probably not cdi) Stator(the wires to the stator appear fine and I could not find any cuts or abrasions) Plugged pilot circuit in both carbs (I checked both thoroughly, especially the hs40) coil(new coil) Probable: Misadjusted idle in both carbs (I have moved the idle screws around while trying to start it) automatic decompressor coil pickup My current thinking is that I have spark but the bike won't fire more than 3-4 revolutions so the spark may be weak or out of time. Can the coil pickup or stator be tested? How? Any other ideas? Any help would be greatly appreciated!