Since no one has helped you yet, I am going to try. I am no pro at bikes and motors but I will try and help you out.

So can anyone tell me where i can buy a new ignition coil and the wires that connect to the spark plug, iv looked every where on the internet but i can find anything for my bike.

Again, no pro. I googled, "where can I buy a new ignition coil and wires 1991 suzuki rm 125" and found this website.

SITE: [ Register or Signin to view external links. ]

Try that out. No idea if that is what your looking for. With your bike being such an old model it may be hard to find parts but, if our lucky, your bike can use newer parts.

So what can cause my bike not to start? and what should i do? Do you think the ignition coil and wires are the problem?

A lot of things can make a bike not start but some of the major ones are the battery, the fuel, and the ignition.

BATTERY: The battery must be fully charged, especially if it is a new one. Most battery manufacturers recommend you slow charge the battery overnight. If you dont already have one, a trickle charger or Battery Tender is a good investment; as is an inexpensive voltmeter.

With the engine off, the battery should read in the vicinity of 12.5 volts. When the engine is running, it must be rotating at roughly 1,500 rpm or faster before it will begin to charge the battery. With the voltmeter still attached, rev the engine and you should see a reading of approximately 13.5 volts. If it does, then the charging system is operating correctly. When idling, the motorcycle is running off the battery, and if you let it idle too long, it could exhaust the charge in the battery, and the engine may die.

If you press the starter button and the engine turns over, but does not start, then the problem is most likely NOT the battery. If you press the starter button, and nothing happens, then the battery may be dead, OR you may have neglected to do one of the basic things, like turn the key on, or put the kickstand up.

FUEL: Make sure you have fresh gas in the tank, not some stuff left over from last years riding season. If you are not going to drain the tank for the winter, then make sure you use one of the commercially available stabilization products like Sta-Bil or Sea Foam.

If you have just tried to start the engine for the first time in a while, then the possibility exists that your carburetors may be gummed up from sitting. The appropriate amount of Gumout or Sea Foam may help; but if it doesnt, you will probably need to remove the carburetors, disassemble them and clean the gunk out of them.

Make sure the fuel petcock is turned to the proper position. You most likely have an On and a Reserve position on the petcock. If the tank is low on fuel, you may need to put the petcock in the Reserve position. If you have cranked the starter, and the engine does not start; check to see that you have not flooded the engine. I good indicator of a flooded engine is if you can smell a strong odor of gas near the carburetors. You can also remove one of the spark plugs and check the electrodes to see if they are wet. If you smell gas, or the spark plug electrodes are wet, you may have flooded the engine. If so, then make sure the choke is Off, let the bike sit for a bit, and try to start it again, this time without giving it any throttle.

If you do not smell gas, and the spark plugs look dry, then you may not be getting any fuel. Your gas tank may be equipped with a fuel line filter, either near the petcock assembly, or somewhere in the fuel line itself. Check them to make sure they are not dirty or clogged; if so, replace them. Your gas tank may also have a vent line which may be plugged or pinched. If it is, the engine will not be able to receive fuel.

Remove the gas filler cap, and if you hear a hissing sound, like air being sucked into the tank, then the vent may be the problem. Try starting the engine again. If it starts, then shut it off right away and resolve the vent problem. There have been reports that clogged vent tubes have caused the gas tank to buckle or collapse due to the vacuum created in side the fuel tank by the blocked vents.

If everything looks OK, and you have a can of starter fluid or a spray can of carburetor cleaner, you can try spraying a small amount into your air intake, the try to start the engine. If it fires up, but then dies right way, then you are probably getting spark to the plugs, but not getting fuel to the carburetors and you may have to tear them down and clean them. Do NOT keep spraying stuff into the air intake; you may damage the engine that way!

If you still cant get the engine to fire, then you may have ignition problems.

IGNITION: There are 2 basic ways to check to see if you spark plugs are firing. You can leave the spark plug installed, and pull the rubber boot from the plug. Stick a screwdriver into the rubber boot, making sure the end it touching the connector inside. Hold the shaft of the screwdriver about 1/8 of an inch away from the engine block and crank the engine. If the ignition is sending juice, you should see sparks jumping the gap between the screwdriver and the engine. This will tell you if the coil is delivering spark to the plugs, but it wont tell you if the plugs themselves are bad or not.

An alternative method is to pull a plug, check to make sure that the gap is within the manufacturers recommended specification, and then connect the boot to the plug again. Hold the electrode against the engine, then crank the started and see if you can see spark jumping the gap of the plug. You probably want to hold the plug wire with rubber handled pliers, unless you enjoy getting zapped.

If you dont see a spark, then you may have ignition coil problems, or other issues. Find the location of the coil on your bike, it may be under the fuel tank, and make sure all wires are connected correctly.

Using fresh gas, new plugs, choke in the off position, try starting the engine. If it still wont start, then you will need to check for things that are outside of the scope of this post. If your motorcycle starts and stays running, then its time to celebrate and go riding. Dont get too far away from home though, just in case you missed something.

I really hope I helped you out. Like I have said before, I am no pro. I did some research and tried to give you the best answer I could. If you have anymore questions, I would love to help you out even though I am no pro. Feel free to PM me whenever.

thank you for your help, i am going to try zapping myself to make sure its not the ignition coil. and i will have a look at the website you have provided me with! Thank you very much for your help!

Look at your Rep

Thanks. If you have any more questions I will do my best to answer them. Good luck with your bike.

ItsGambleFTW wrote Thanks. If you have any more questions I will do my best to answer them. Good luck with your bike.

i looked at that website but it doesnt look like the part that i need.

ECS wrote

ItsGambleFTW wrote Thanks. If you have any more questions I will do my best to answer them. Good luck with your bike.

i looked at that website but it doesnt look like the part that i need.

Do you know the part you need or is that the problem. You don't know what is broken so you don't know what needs fixing. Is that right?

my dad says it must be the ignition coil which i do know what that is, because he said it just fell aprat when he was taking the bike apart to check the pistion. but idk if thats the problem
.

It could be the valves, when you kick it does it feel like it has any compression, maybe try swap the spark plug, change the fuel (make sure it's 2-stroke fuel), and if it has a battery (not sure if it does) try replacing it.

you should get a bigger bike, although a 125 will haul ass, i had a 85 Yamaha bored, hit 70 lol

Possible timeing chain problem?