Have a DT50 watercooled yamaha,that I recently (6 weeks ago) bought ,ran perfect, now wont start ?
have tons of spark,clean carb,fuel runs out the fuel line,when un pluged from the carb. It as a small 6 volt battery,that was checked and is putting out more than 6 volts,checked the switch on the kickstand,even un pluged the switch and tried it with the ends pluged together ,eliminating the switch,no diff... when I pull the plug I can run fuel into the plug hole replacing the plug with tons of spark ,key on,lights on dash lit up and nothing.tried removing the side cover ,put a socket on the crankshaft nut holding the lflywheel on ,with an impact driver ,spun the nut off after a number of attempts with locktite.never once even fired.it has points, if the points are closed,can it have spark at the plug? if it has spark,why wont it even fire?checked all the wires for anything un pluged and have spun all the connectors ,hoping for continuity. has compression ,as much as a 50 can have,when it came home you could rotate the kick starter by hand and it purred,Havent checked the switch on the handelbar that has 3 positions.only when checking for spark ,noticed saturday that when the plug was out and grounded and sparking,when you switched it to the off position and kick it over the first 1 or 2 kicks it would spark then no spark till you switched it to the on position.next move is a big long downhill,or a mandrel to drive the flywheel,via the holes in it with pins sticking out of a disk driven by the impact driver. will investigate the points and confirm there opening. replaced plug with new correctly gaped one
Discussions
2 years ago
You must be a disciple of William Faulkner the American author who was famous for stream of consciousness writing technique likeThe Sound and the Fury and As I Lay Dying, reacting to pain you are full of sound and fury when your yamac is limp and dying, Saturday wires while a plug on the ground un-sparking when points closed by locktite was a disc wheel flying hand driven mandrel holy impact compression realization is six vaulting on position pin kick me downhill...
Answer 2 years ago
:-) You really must stop drinking so much Coffee! or write a Novel.
2 years ago
If you can rotate the kick start by hand it does not say much about your compression! Check the compression with a compression tester.
The spark plug needs to spark out of the engine grounded to the engine block and the spark has to be between the electrode and spark plug leg. Not when held at a distance from ground or else the spark plug could be faulty. Try heating it up a little with a flame or burning it with a fuel soaked rag.
Beware not to cause a fire and do this outside!
Check that the fuel is new or try some start spray into the air intake but be careful that stuff is highly flammable.
Put everything back together and give it a good push start maybe down a hill.
Good luck.
2 years ago
If you are too lazy to format your text and use punctuation - then you really don't expect anyone to read that stuff!?
2 years ago
If, it was running fine and then not and "everything" else is right, then try replacing the gasoline. Buy the gas from another location (brand),
https://yamahaclub.com/forums/topic/7077-yamaha-dt... has a decent checklist for diagnostics but Google DT50 won't start and look around.https://www.google.com/search?q=DT50+yamaha%2C+won...
You could also try the post over on the Yamaha Owners Club board forum https://yamahaclub.com/forums/
2 years ago
assuming the spark is at the right time (important)
and there is adequate compression
I suggest get a mechanic to look at it.
2 years ago
Now THAT! Is hard to read...