neewbie to this site with no spark on my 82 maxim 750

i have been working on this for to long and now that im almost done i have no spark. I have tried 2 different pickup coils, cdi box, and rectifier. What else should i check? IM assuming my coils are good because neither one is working. Also my starter is not always engaging could this be a bad gear? I know a few ppl who have maxims and there starters do the same thing occasionally but mine is starting to frustrate me.

 

1. Clean the mounting areas I have even used die electric grease on the gounds.

2. Check fuses.heck just replace then all who knows when those old ones were put in, maybe even replace the old fuse block with a new one from radio shack.

3. now check for voltage. check battery for a full charge.

well thats a start .

 

check for voltage at the coils.... if you have voltage, clip a test light to ground and probe the negative side of the coil connector. when you hit the starter, the light should flash (telling you that the ignitor/wiring/ect are functional.) if it flashes, then start looking at the coils for resistance (spec is in the book,) and ground. if the test light doesn't flash, you have a problem in the primary circuit and you will need to measure pickup coil resistance, continuity (from plug to plug between each component up to the ignition coils) of all wires, and in doing so you can eliminate (per yamaha service procedures...) everything but the ignitor. if everything else tests good, you'll need a new ignitor. whatever else you do, TEST and don't guess. it will save you a lot of frustration. I went through the same process on my xj when i brought it home in buckets and learned the hard way... good luck!

 

Have you examined the kickstand switch? The starter safety interlock system can be a source of trouble. I've had issues with a sticky kickstand switch and the relays can sometimes grow weird stuff inside. Take these components out and clean them out nice and good.

 

im checking all the relays now. I dont have power going to the coils. I already checked the stand switch and bypassed that and still does the same thing.

 

Skar, do you have a manual on your bike? Use the schematic to chase the voltage (or lack thereof) back to the source of the problem. Power to the coils comes from the TCI. The TCI gets it's power from the sides stand relay and the Start button. And so on. Hate to see someone flounder around, it wastes time and discourages the mech. Have you followed up on Flash or Boom's advice?
Typical no spark issues tend to be fuse block, TCI, pickup coils, ignition switch, sidestand switch and relays. I hope you find something obvious.
Best of luck!

 

i have bypassed the fuse block for now (i know its not smart but im desperate) I think i checked the side stand relay and it said it was bad but im not sure if i did it right. Can you use a jumper to bypass the relay? I called Yamaha and its like 54 dollars for the side stand relay and would hate to buy it and that not even be the problem.

 

Yes, one can by-pass it by I'm not up on the circuitry involved. I'd have to get back to you on the particulars. Relays are available from Chacal, so don't fret about the stealer-ship.
I would caution you about bypassing anything long term. I hope this is all being done with the understanding that you will get it back together correctly once you isolate and eliminate each problem.

 

ill have to check chacal out but yes after i get it figured out everything is gonna be fixed. If you could let me know how to jump it i would appreciate it. Im looking for my wiring diagram to see if i can figure it out. I hate electrical problems.

 

ok found my diagram but the colors seem to be different than whats on my bike. what relay is located below the rectifier? Could it be the diode or possibly the starting circuit relay?

 

The Haynes book says the starter-cutoff relay is located under the tank as does the factory manual. Neither book indicates the existence or function of that relay. I have no idea what that relay is (don't have a good book on your bike).
What wire colors are you seeing and what are they attached to?

To bridge your starter cutoff relay, jumper the red/white wires together. This will bypass the clutch, neutral, and sidestand switches and let you know if you have issues with these items. I would use it only to test the circuits, not to remove the safety switch.

 

ok i finally got all the relays checked and i believe they are working. the one below the rectifier is a headlight relay. Does anyone know what wires i need to check my pickup coil on. I swear i read it in my book but cant seem to find it now that i need it.

 

ok i got power to my coils now but one is getting warm and still no spark. Why is one warm is it bad or do i have issues with my wiring?