hey everyone... I've got one of those unsolvable mysteries with one of the bikes, my '76 DT100.
So i spent a couple dozen hours this winter cleaning it up, running through the elect system, replacing goodies including carb, rectifier, treating tank, plug, etc. A month or 2 ago it started up on a nice late winter day, and i was able to take my 4 year old for a nice slow ride in the field next to our house. we went on a few more of those rides, at it ran great. then 2 weekends ago i was giving the neighbor kid his first motorcycle lesson, and we were riding around the house, it the DT just quit.... like full blown stopped just like i hit the kill switch or turned the key off.
i checked everything i can think of... there's fuel, i've got spark when the plug is pulled and sitting next to ground while kicking over... i've got ~110 psi compression, and it appears i've got fuel. it's a new carb, and it won't even start on JUST starting fluid... not even an attemp to fire. i don't have much 2-stroke experience, so i don't know all the inside tricks a/o things to look for (i am a pretty savvy mechanic though). i disconnected the kill switch completely from the harness... so that's eliminated as a potential issue (but it wouldn't have spark if the kill was broken).
one thing i have NOT done is check the timing.... i don't have a dial gauge... is there another way to check it? regardless, i've riden in cars/bikes that have had the timing off a bit, and how this baby just turned off doesn't lead me to think it's a timing issue.
Anyways, just frustrated here as it's Spring in Iowa i want to ride (well, actually my son wants to ride)! if anyone has any advise i'm all ears. thanks a ton guys.