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No spark on a 89 Yamaha Ovation 340 snowmobile

S

SDE

Well-known Member
This is a wrecked machine that I got at an auction. IF I can get it to run, I will put the engine in an old 72 Chapporral. I attached a battery and the tail light is on. There is not a key in the switch. Is the switch in the ON position?
The back of the switch has power to a red wire and also a brown wire. I believe that the red is power in to the switch and the brown must be power to the lights. When I put a jumper wire from either of those two terminals, to the red wire that has a white stripe, the starter engages, but the plugs do NOT fire. When I touched power to one of the remaining wires, I blew a fuse. I replaced the fuse.
The coil has two wires attached to it, and of course the two plug wires. Can I attach a jumper wire to the coil from the battery and then look for the plugs to fire when I engage the starter?
I want to get the electrical in working order before I put any gas in it.
Thank you
Steve
 
If you can figure out what side of the coil is ignition then yes you should be able to hot wire it so to figure out if you have other problems
 
A lot of the older sleds if you unplug the ignition switch, you can start it with the rope. Use the handlebar switch to turn it off..
 
Likely, the engine has self-powered (magneto) ignition and putting battery voltage to it will/did kill it.

The key switch and the handlebar "kill" switch short the ignition primary to ground to stop the engine.

Better verify if it is as I suspect (or actually needs 12 Volt power) before making any more attempts to let the smoke out of the ignition system.
 
Does it have a kill switch on the handle bars? If it does make sure it is pulled out. Look around the handle bar area and see if it has a black button where a tether is hooked up. If that is not hooked up by a tether it won't fire
 
I think Bob is right. Back in those days snowmobiles had a magneto ignition. If you can unplug all the wiring from the engine except wires going to the ignition coils.. Then pull the rope and see if you have spark.
 
Like said below, the electric start has nothing to do with the ignition system. Unhook the wiring harness so that you illimiate all of the switches and wiring from the equasion. You will have a lighting and primary ingnition coil on the stator plate under the flywheel as well as the trigger coil. A shop manual for the sled will give the resistance tolerances for the ignition and triggers coils. If they are good you have the CD box and the coil the spark plug wires are attached to on the outside of the engine somewhere. The item that usually fails first on those old yammers (sleds and bikes) is the coil the spark plugs wires come out of and they are fairly cheap. Unless technology has changed, the CD box is the only component you can't test for failure. Nippondenso CD boxs rarely failed, but it did happen occansionally.
 
Thank you for all the suggestions. I will check the kill switch first. I think I did pull it out, but I can not say for sure. Secondly I will unplug the switch and give a few pulls on the recoil rope. I have never had a sled with a tether, but I will give that a look out also. I checked the compression tonight and it is around 100 lbs. It has an 05 registration sticker an so I assume it has not been run in about 8 years or so.
Thank you
STeve
 
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