Folks,

there are at least three (electronic ignition) flywheels listed for the dt250mx that i can see (on ebay). we have F1T350, F3T350, F3T357, F3T30072  etc.
Does anybody out there know if these are interchangeable on the same stator?  
I have an F3T30072 flywheel but i am getting an electrical type misfire at more than half revs. the plug, coil, cdi box are all brand new.

any info on this very welcome, before i start spending money!!

cheers
les.

 

Will it get through tyhat misfire or does it limit revs. If it limits the revs & just won't go past that point, let's be sure its electrical & not a blocked exhaust. I guess by the year i'm thinking yours must be it wouldn't have the jet setter Oring & side mounted main jet. If it does, then a faulty Oring lets it run super rich on open throttle.

RT325,

It will not go thru the misfire, very electrical sounding, a sharp stutter and almost like backfiring. the exhaust is new and i have even taken out the baffle to be sure its totally straight thru, (deafening!!). the carb is aftermarket Kehin, which i have used plenty with good results, i have jetted the carb to the point of spluttering and gone the other way to weakness so am pretty sure its not the carb.

my stator and rotor were purchased separately from Ebay, i believe the stator is marked 1M2 and the rotor is F3T30072, i was happy that i had found a match because it started and ran, but now the problems start!

any ideas peeps??
les.

 

Ok you may be quite correct & 'onto' the problem but i'm no help with flywheel variation & what--if any--difference it would make to running. So 'for me' best plan is let's hear or see & hear a good video please--could make all the difference.

I recently watch a series of videos by Dale Sweger on youtube where he was dealing with a similar issue and got it fixed.  Search for Dale Sweger Yamaha AT-2 MX Ignition.  I think there a 4 videos in total on this issue.

He sort of addressed a bunch of things at once so the actual issue was never pinpointed but I was very impressed that he did not give up and he got it fixed in the end.  My guess is that the rewiring he did fixed the problem.  From what I understand, the CDI ignitions generate a high voltage from the stator.  My theory is high voltages can arc through wire insulation on old wires.  It may idle fine but be a problem at higher rpm.  Higher rpm = higher voltage.  Check for signs of arc burns in the wires.  Some of the other fixes are fairly easy and worth trying.

I have thoroughly been enjoying watching Dale on youtube and have learned a lot along the way and it’s inspired me to start working on my DT360 again.  I highly recommend his channel.  I’m sure he would appreciate a bigger audience.  and more subscribers.

cheers for the replies guys, i will be acting on all of this soon. i will post more.

les.