Honda 90 atc no spark at plug

[nurse]

I have a '75 honda 90 that my son and I are working on. Should I be able to "see" a spark at the point gap? I searched here and found that the gap should be .015. Mine is close to .08-.010.

I have power at the points, can't see a spark, and have no spark at the plug. Both the head light switch and the handlebar kill switch look fine.

Any help on were to look would be greatly appreciated.

-T

[Dirtcrasher]

Welcome to 3WW nurse....

I'm not familiar with the 90's but some of these guys know them very well and I'm certain can hook you up :D

But yes, when you pull the cord with the plug close to a ground (motor case) you should see a strong spark.

[nurse]

Welcome to 3WW nurse....

I'm not familiar with the 90's but some of these guys know them very well and I'm certain can hook you up :D

But yes, when you pull the cord with the plug close to a ground (motor case) you should see a strong spark.

Should I be able to see a spark at the point gap? My test light lights up at the points when I pull the starter rope, but I can't actually see or hear the spark jump the gap.

Thanks!

[ssrecords]

try a new plug

[harryredtrike]

try a new plug gapped right.and test.also run a search of post to really find alot of info on the no spark situation.this subject has been thoroughly vetted.also welcome to the boards:welcome:

[Vealmonkey]

Try grabbing the spark plug when you give the starter cord a yank. You will know for sure if you are getting spark or not!

[MonroeMike]

Try grabbing the spark plug when you give the starter cord a yank. You will know for sure if you are getting spark or not!

But it's waaay more amusing, if you have someone else hold it, while you pull the rope. :twisted:

[ssrecords]

ain't that the truth:Bounce

[nurse]

try a new plug


I have, I'm not getting spark to the plug, that's the problem. I'll do more searching. Thanks for the help.

[MonroeMike]

I searched for "honda 90 points" and found results.

Here's one

http://www.3wheelerworldforums.com/showthread.php?t=47378&highlight=honda+90+points

[2L84U]

The on, off switch may be bad. Just unplug it and make sure the contact ends don't get grounded.

[Vealmonkey]

I was just kidding earlier about grabbing the spark plug, couldn't help it really. What you might check for first is to unplug the ends to the starter swtich and then plug the ends of the wiring harness back together bypassing the starting switch. This tests to see if the start switch is bad. You will also want to check to make sure where your coil is attached to the frame is nice and rust free. You want to make sure that grounding point is working properly. If you have a coil with a ground wire, make sure wherever that is attached to is rust free and has a good ground. Make sure you have a new spark plug properly gapped. Make sure your spark plug boot is screwed into the end of the coil wire all the way. Make sure the core of the coil wire is in contact with the threaded part of the spark plug boot. You will also want to check your points and condenser. Make sure you points are opening and closing properly. Make sure all your connections are properly attached and not rusty. You want to make sure the pads on your points are nice and flat or you may want to run a "points file" between them or a small piece of sandpaper so you can make sure that they do not have any carbon buildup between the pads on your points. You may just want to install new points and condernser, since they aren't expensive. You may want to check all the ends of your wiring harness to make sure they are attached to each other securely and not corroded where they are attached. You will want to check your wiring harness for cracked or broken wires. It's alot to check for, but it's the only way. Hopefully it is something simple and cheap to fix. It can get costly to have to replace the coil compared to replacing the points and condenser. Hopefully a previous owner has not buggered up your wiring harness which can be a real pain. Best of luck and keep us posted on what you find. And sometimes people make it too easy to get a little fun poked at them. LOL Welcome to the boards.

[nurse]

I want to thank all here for the help. I pulled the coil out and cleaned the grounding surface, and nipped a little off the end of the coil wire before I screwed the plug cap back in. I also reset the breaker points to .015. It fired right up and the kids and I had a blast today :p

It burns oil BAD. Always has. I'm going to need to pull the head off and atleast re-ring it, where is a good place to order aftermarket parts?

Thanks again for all the help.

-T

[Vealmonkey]

Glad you got it running. Hope you weren't too bent about the ribbing. You can try service honda and check for the rings. But make sure when you remove your head and cylinder to check for the piston size that you make sure that your cylinder is in round and doesn't need bored out to the next size. You will want to make sure you hone your cylinder and check for proper ring gap and you should be good to go. Have you checked the cylinder compression. Your oil burning may not be caused by bad rings. A bad valve guide or valve seal will cause the trike to burn oil also. If you check the compression and it is low, I would suspect rings and piston, if compression is somewhat normal, I would think the head would be tired and be your oil burning source. Best of luck. Keep us posted and let's see some pictures.