#1 no spark coil to sparkplug

[mason79]

okay gents i know this bores you, but i got my float and hope it works, then i can bury this thread once and for all, i ask you all for a moment of silence so that the beast can break it...
thanks

[mason79]

okay did not work same thing, swap plug wires 1 and 4 the problem stays with the cylinder and the plugs are new and compression good across the board

the coil for 1 and 4 is new, can it be so wweat as to power only one plug?

help!! anyone

[Ken Talbot]

Fuel, air, ignition. With all three, it will run. Missing any one, it will not run.

You've confirmed that you have spark by taking the plug wire off of the working #4 and putting it on the dead #1, and #1 stays dead. At the same time, the plug wire from the dead #1 lights up the #4 no problem. You have spark so don't worry about this part of the equation any more.

You have verified the air part of the equation is okay because you have good compression. Just for the heck of it, remove the airbox and stick your hand over the mouth of #1 carb while you crank it over and you can reconfirm that it is drawing air. Of course, you will check for a dead mouse or other small critter in the velocity stack leading to the carb.

That prettty much brings us to fuel, which you obviously don't have. Never mind how many times the carbs have been off already, or that you've got a new float, or pretty much anything else. Something is still wrong (i.e. plugged) inside that carb.

The expression 'triple clean' for some folks is only a starting point. Some guys have gone through their carbs 10 or 15 or 20 times before they finally managed to get all of the passages and orifices in a set of carbs truly clean. Often this is because they never really totally disassemble the problem carb, and think that spraying a bit of cleaner through the few passages they can see easily will do the trick.

I hate to say it, but I think you've gotta go back into that #1 carb again.

[mason79]

yes sir, firstly i owe you and all who has treid to help me a debt of gratitude, helping a stranger; i'm grateful...


i have in between waiting for parts, gone over every inch of the bike with a good cleaning and basic maintainence,

this last start up in sans airbox and i cupped my hand over the sucking and got gas so it seems, it's drawing through the mains,
i'll check the tube for the enrichment circuit, maybe it's dry, i did not pull the plugl this time, but the last time it was wet.

if it is wet, then i have got fuel right? we'll see. i'll clean the carb again.

why won't the spark jump to plug #1? does it need a combustable mixture to know when to jump?
well see and thanks for been here: )

[LoserShoes]

Have you pulled the plug and connected it to the wire and held the metal part of the plug against the head, and cranked the motor? To see if the spark jumps the gap? Do it with both 1 and 4 at the same time.

Have you switched #1 and #4 PLUGS? Could be a bad plug, it happens.

Also see if the vacuum slide on #1 moves freely. Does the butterfly valve rotate?

Try giving #1 a shot of starter fluid before cranking it.

Got an inductive timing light? The type that clips to the plug wire? Real handy to see if a plug is firing.

I would start looking for a real rich condition on #1. Or a big air leak.

The best way to trouble shoot something like this is to take a couple of days off, then come back to it and methodically go through it changing one thing at a time.

It's possible that there are two or more problems that look like a single one, and these are the hardest to fix.

Remember right now you are just trying to isolate the cause, not fix it. Once the cause is determined, fixing it is easy.

You may know all this already, but just trying to cover all bases.
Steve

[mason79]

new plug and swapped plugs problem stays with cylinder


what does starter fluid do?

[mason79]

thank you

ken talbot

loser shoes

turbopete

diverray

topcat

and john

this bike wooofs, now to get registered and insured, thanks again

i've been blowing blue smoke all this time i did put in some oil in the cylinders because of the flooding shoun't it be gone by now? , is this common and should i really run it for a while to blow things out?

[LoserShoes]

Does this mean you found the problem?
If so what was it?

Yes it can take a while for the oil to clear, and wont hurt anything as long as you don't foul a plug.

Steve

Ps starter fluid is volitale enough that it will start a flooded engine, if it fires with the starter fluid, it's way rich if the plug is wet.

[mason79]

ken made me take the carbs out again, i must say i can do it fast, and i have learned quite a bit about carburation,

appearently , the pilot circuit was too lean or non existant, and would not keep up with the other cylinders, i looked at a bucket of carb cleaner, but it was a bit too clumsy, i thought about the stater fluid, but felt , it was a patch instead of a real fix, so bought some carb spray, and went to town,

besides i could not get the screws off the enrichment rod and bracket, i chewed them up a little, i squirted every little orifice and before i put it in knew it wuld no longer be the carb, if it did not run.

thanks for asking LoserShoes

mason

[Ken Talbot]

Hang on there, Mason, we can't let you get off too easy now, not after all the work you've put into it so far. Did you just say you still have not been able to "get the screws off of the enricher rod and bracket"? Does that mean you have not taken that enricher completely apart?

[mason79]

you mean the wary can't rest? now what on earth makes those screw stick like that , what would unglue that, liquid wrench, penetrant?

enrichment, it works, could there be a hidden problem by not opening that circuit and besides the yamaha dealer the po took it to "rebuilt the carbs" that's why i was here with my, as topcat would put it "carb hell",right.

[Ken Talbot]

I think a lot of times when you take a bike this old to a dealer to "rebuild the carbs", they don't do much more than throw in a couple of new jets where the old ones are easy to get at, and maybe they toss in a new float bowl gasket. Pretty minimal effort in all.

If you've got the enricher working now, you'd probably be happy to just ride for a while and I can understand that. The bit of spray cleaner you managed to blast through may have actually removed what was causing the trouble. OTOH, depending what it was and how big it was, it may have just dislodged it. Can you see where I'm going with this theory? At least now, if you lose spark to #1 cylinder again, you'll know where to go looking for the fix..

[prometheus578]

"I've got issues!"

Ok... too many issues at once, I can't deal with it. So... Let's start over, shall we?
Bike is running on three cylinders.
That's either a plugged pilot circuit on #1 cylinder, or no spark.
I've read that you've swapped plug wire #4 and #1. Plug #4 still sparks using #1's wire, but plug#1 still doesn't spark even with #4's wire. Is this correct?
If after swapping coil wires a plug doesn't fire, it's either a bad plug or a fouled plug. Plug wires get stiff after a while. Are you certain that when doing your test the plug was grounded against the engine and not just lying close to it? Sometimes with stiff wires, the plug doesn't want to lie still. I take a small jumper wire and clamp it to the threads on the plug and hook the other end to an engine fin. Then I know the plug is grounded, fer sure.
Do a quick test... pull all the plugs from the head, but leave them in their plug wires. Wrap wire around the thread of each plug and ground the other end to the engine somewhere. (don't have the plugs next to the plughole, lest you ignite the mixture and singe your moustache)
Good... all plugs grounded? Crank the engine. All plugs are sparking, yes?
(And I want clean plugs, not ones all sooty and fouled. They may spark or they may not)
Post again with your results. If they all spark, we'll play the carb game. If #1 still doesn't spark, then we'll tackle that issue.

[prometheus578]

"The more I reread, the more confused I get"

Am I to understand that there no longer is a "Spark" issue? That the non-spark was due to fouled plugs? Is he now "SPARKY" on all four?

[prometheus578]

"The duality of Man"

I get confused when I read," My cylinder isn't sparking", when what I think they mean to say is, "My cylinder isn't firing."
Like when my son calls..." My car isn't starting."
Is it cranking but not starting... or is it not cranking at all? Two different problems, two different remedies.