yamahamike

I'll look, I do know that the key is gone, so I tried connecting the brown and red wire together and no change

Ok, but I have an old Yamaha manual that says those are the factory jets for a 1975 dt 400. I put a timing light on it and it seems to be firing 2" before the pulsar pickup. The mark on the magneto 2" before pulsar

Ok, but I have an old Yamaha manual that says those are the factory jets for a 1975 dt 400. I put a timing light on it and it seems to be firing 2" before the pulsar pickup. The mark on the magneto 2" before pulsar

Cdi no points, no key and the kill switch is a wire that you touch to the handle bars. No blinkers , no headlight, no voltage regulater, and the only electronics left is the cdi box.

Most of wiring is cut out, no key but I tried connecting the red and brown wire out of the terminal, no change. Will check wiring again. And woodruff key is good

I did with a used one, did the exact same thing.

I did with a used one, did the exact same thing.

Hello, I've got a bike that starts, idles fine but 3/4 throttle backfires pretty bad. Messed with the timing no change. Put a timing light on it and seems like the mark on the magneto is about 2" early on the pulsar pick up. So, maybe the cdi? Someone cut out a lot of the wiring to make it more of a dirt bike. Anyone have any ideas? Thanks in advance

There has to be a little slack (free play) in the throttle cable. When you turn the handle bars side to side, does it rev up? If so that's it

No, it was, fixed that, that was the first thing I checked. The fin on the bigger coil that holds a couple wires is cracked. I jb welded that. Would that do anything negative? The wires are still soldered together and not touching metal.

I pulled the reed block, looks like there hanging open just a bit, around .020 is that excessive? Would that be making it pop? And have a dead spot about 1/4 to 1/2 way open? The main jet is 160 and the pilot is 40.

Ok thanks everybody, I will keep you posted

Hello there, I got this bike that runs, it just kicksback and backfires when you open it up. Starts and idles but spark plug gets sooty after just a few minutes of running.I adjusted the timing a little bit forward then backward, it didnt seem to help. Anybody have any ideas? Thanks

Man thanks, it fired right up, I was confused I guess, I was using a 6v battery and it wasn't working. Yesterday i noticed a lot of the electronics had a 12v emblem on them. I always thought those bikes were 6v. I put a 12v jumper box on it and it fired up. Thanks again.

Hello all, got a 73 125 at2 I think, I always thought it was a dt but maybe not anyway I've had it running, but not real good. It would only start by jumping it and only by kick when it warmed up, but not always. Now I can't get any spark out of it. I've played with the timing, points look good, put a different condenser on it that was used, but no difference. Any help would be greatly appreciated.

Ok ill give that a try, when I get my kick starter back. It broke last time i kicked it.

Hello, I have a 1975 dt 400, its got a huge dead spot in the throttle, and it kicks back when I kick it. Just got the bike had a broken woodruff key. Starts and idles just hesitates when you open it up.I cleaned the carb already.I also bought a dial indicator and it does seem like its in time, although I might not of been using it right. 2.9 mm btdc. Any suggestions? Thanks

How do you tell if the oil injection system is working? I took the cover off and the plastic sprocket is turning, the throttle cable is attached and working, I loosened the nut where the line goes into the motor while running and no oil comes out.is it supposed to?

How do you tell if the oil injection system is working? I took the cover off and the plastic sprocket is turning, the throttle cable is attached and working, I loosened the nut where the line goes into the motor while running and no oil comes out.is it supposed to?

Got the new points and condenser and installed them. It fired right up, so thanks for the tips!

Ok, points looked shot so I got a new set and condenser coming. Ill let you know if that works, thanks! One funny thing is I got spark once and only once, while swapping coils. Weird right?

Ok thanks, ill give it a shot

Hello, I got a 74 dt 125 yesterday with a no spark issue. I hooked a battery to it and the electronics don't seem to work. I have no horn, lights , no neutral light nothing. There's voltage flowing to the ignition, and some other wires I noticed with a tester. I pulled the magneto and looks like someone tried replacing the condenser. It has some soldered wires on top of it. Looks like they couldn't get the stator plate off because of some badly stripped bolts. Anyone have any idea's on what might be going on Why nothings working thanks!

Hello, I'm mike, got my first when I was 8. It was a gt 60. Been addicted ever since. Anyway, got a 74 dt 175 today, put a battery in it and nothing, no lights, horn, nothing.Power is flowing around at ignition, and other places as well. Pulled the flywheel and looks like the condenser has been soldered like someone tried to change it. Stator bolts are very badly stripped. Anyone have any idea's as to the no power and no spark? Ever heard of none of the electronics not working? Thanks for any help