Tri moto 125 weak spark?

[Trikeboss]

My tri moto I just picked up cheap will not even try and fire and wont start out of the blue...Got it from a friend for $100 - It has always ran ok a bit boggy down low and rich up top but ok thats why i got it to fix the low end bog and to get some more rpms out of her... then just died and would not fire..It sounds like the kill switch is on when im trying to start it-sounds like it has no spark?...New plug-I cleaned the carb.Compression @ 120lbs..no luck...I checked the spark and it looked a bit skinny and weak not sure if thats the problem or not...How can I test this? What should be my next step? I want to ride this beast!

:beer

[Yamaha_Rules69]

A couple common problems on the YT's are sheared flywheel key (usually will jerk your arm back when trying to start though) or faulty ignition coil. The coils on these like to crack on the plastic body, and arc over to the frame. Try starting it with the fenders removed, and see if you can see spark jumping from the coil when you also have the spark plug grounded. If it looks ok, try unplugging the kill switch at the connector, then try to start. That rules out kill switch problem. Otherwise, try a little starting fluid down the plug hole, and see if it pops. If so, you have a fuel issue. I know if you need a new coil one from ALL the yamaha 3 wheelers from a 60 to 250 will work perfectly. Even the 4 stroke 200 and 225's will work. Hope I gave you an idea. ---- Jon.

[yamaha driver]

its problay the coil. you can go to an autovalue and pic up a coil, its kinda a universal i have on on mine and works good.

[trizilla]

is the spark blue or orange? blue being good and orange being weak. what is you plug gap at? have you cleaned any connections? i always try this before i buy electrical parts. remember that electric parts arent returnable so if you buy and dont need its yours to keep. i would go through all connections first, pull them apart, spray some W-D down in the connection, work them in and out a couple times and reconnect. also clean the connection at any grounds. continually re-check for spark and if it doesnt get any better then start testing components. good luck!

[Trikeboss]

Well it fired with starting fluid....so the spark was good.... Im no expert but the more I read im thinking a crank seal went bad and is causing the fouling problem ...I sold it for cheap to someone who wanted to fix it up...I would have fixed it myself but im learning that im a honda guy when it comes to ATC's

Sold the 125ytm and got a nice running 185s for cheap the very next day...Man I love putting want ad's on craigs list :D