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Message started by foxx on 09/03/13 at 06:48:50

Title: Gen Question
Post by foxx on 09/03/13 at 06:48:50

if i got spark but not hot enough to fire what would cause that ?{ battery is charged to full.}

Title: Re: Gen Question
Post by verslagen1 on 09/03/13 at 07:28:53

bad coil, bad ig box, bad ground, bad air. [smiley=2vrolijk_08.gif]

Title: Re: Gen Question
Post by Gyrobob on 09/03/13 at 07:43:02

If you have any spark at all, being delivered anytime near TDC,... AND,... there is an ignitable mixture in the combustion chamber, you'll at least get one cylinder-full to ignite. Getting it to continue running is another story.

If you have spark, and there is no life at all, suspect a fuel problem.

Title: Re: Gen Question
Post by Charon - FSO on 09/03/13 at 07:57:57

My father used to tell me that about 90% of problems were spark-related. However, that was before electronic ignition systems (much more reliable than points).

We could use some more information. Is this a bike that was running, and just now quit? Or is it a barn queen being resurrected from from the dead? Is the "battery charged to full" a new battery, or several years old? For that matter, the original poster didn't even say what sort of bike it is (although from the posting on this forum we assume it to be an LS650).

Title: Re: Gen Question
Post by Gyrobob on 09/03/13 at 08:07:02

7C575E4D50513F0 wrote:

... 90% of problems were spark-related....

True, but he said he does have a spark. If the spark is weak or not timed properly, then getting the thing to continue to run is another story,... but,... if there is any kind of ignitable mixture in the cylinder, the weakest of sparks will cook it off.

p.s. -- when I used to work in a cube farm, my screensaver said eschew obfuscation.

Title: Re: Gen Question
Post by justin_o_guy2 on 09/03/13 at 08:18:13

eschew obfuscation.

I wish people wouldjust say whatever theymean,

Id try a good brake cleaner or ether spray in the intake, If it will run on that, youve got a fuel issue.
Then Id slap a newplug in, thay can get weird

Title: Re: Gen Question
Post by Charon - FSO on 09/03/13 at 08:54:03

Agreed - he said he has a spark. But a spark across a plug lying on the head isn't necessarily the same thing as a spark across that same plug installed in the engine under compression pressure. If he removed the plug and laid it on the engine to test the spark, then the starter isn't working as hard to turn the engine (no compression with the open plug hole); isn't loading the battery as much; and the battery voltage might stay high enough to fire the spark. Just a thought.

Title: Re: Gen Question
Post by foxx on 09/03/13 at 11:05:27

sorry it is an ls 650 1987 , had the carbs cleaned early this year . was running about 65 down the freeway and just quit. I did pull the plug and ground it to the head to see spark. I changed the petcock after it quit thinking it was bad. i pulled the carb and in doing so saw some dirt in the boot after the filter so that is bad, but it should fire on the ether id think. i'll pull the carb again and take apart . Thanks for kicking it around.

Title: Re: Gen Question
Post by Steve H on 09/03/13 at 14:41:24

Have you tried another plug?

I've had plugs before that would fire perfectly when out grounded to the engine but wouldn't hit a lick when installed. Changed plug and everything was fine again. Not saying that's what's happening...just something to think about. Plugs are cheap and pretty quick to change. And, if it doesn't fix it, you'll have a spare for when you do need it.

Title: Re: Gen Question
Post by Gyrobob on 09/03/13 at 16:10:30

7D7463631B0 wrote:

When you say, "was running about 65 down the freeway and just quit." do you mean it started running rough, slowed down, then konked out?

or

Do you mean it was running fine then acted like the kill switch was moved to "don't run anymore."

Title: Re: Gen Question
Post by Night Train on 09/05/13 at 16:29:33

Quote:

or

Do you mean it was running fine then acted like the kill switch was moved to "don't run anymore."

"That's the voice of experience!
I spent the better part of a weekend trying to learn how a bike goes from running prime to dead as a rock when no one touched it. They say "Start with the simple stuff first". I tend to complicate simple.

Title: Re: Gen Question
Post by foxx on 09/08/13 at 04:18:24

it quit like it was out of gas. after i pushed off the freeway it did start for a short but then died. carb is cleaned again but no change in getting it started. I'm going to take the ignitor to the mechanic and have it tested. book said the average jo dont have the equipment to check it. no hair left on my head to scratch.

Title: Re: Gen Question
Post by justin_o_guy2 on 09/08/13 at 04:57:01

PLugs are cheap

Title: Re: Gen Question
Post by Gyrobob on 09/08/13 at 14:20:21

30392E2E560 wrote:

Don't waste your money. If it has any spark at all, the igniter is okay.

You said it quit like it was out of gas. I infer from that you mean it started losing power, then stuttered on and off for a bit, then just stopped making any power at all,.. so you coasted to a stop.

If it were the igniter, it would have acted like you flipped the kill switch. If the igniter had failed, it would have gone from running fine to absolutely dead in a tenth of a second.

You have a fuel problem.

Title: Re: Gen Question
Post by mjs3790225 on 09/08/13 at 14:42:30

Quit like it was out of gas? Does your bike still have the stock petcock?

Title: Re: Gen Question
Post by old_rider on 09/09/13 at 00:47:02

Sounding to me like a kickstand switch wire or switch is loose. Or one of them other "safety" feature kill switches is loose.

Title: Re: Gen Question
Post by foxx on 09/09/13 at 04:10:13

i changed the plug and petcock to the raptor. i thinking fuel like gyrobob but why wouldn't it fire on ether . will keep you all posted. thanks

Title: Re: Gen Question
Post by Gyrobob on 09/09/13 at 05:47:28

Have you tested to see if it has any spark at all?

Title: Re: Gen Question
Post by foxx on 09/26/13 at 16:49:30

took my bike to the shop to see why it wasn't firing and the mechanic said no compression. exhaust valves must be stuck open. does the engine need to be pulled to get the head off?

Title: Re: Gen Question
Post by Steve H on 09/26/13 at 17:57:22

No compression...have you checked the decomp solenoid?

Title: Re: Gen Question
Post by Serowbot on 09/26/13 at 18:44:28

Crank the engine, and feel for puffs of air at the end of the muffler...(puffs equal compression)..

If you pull the front valve cover (2 bolts),.. you can see the exhaust valves...
You can watch to see if it is working...

If it's hanging open... check the decomp lever... (check for some slack on the cable)...
If they seem to be going up and down fine... try a teaspoon of oil in the spark plug hole... (a gas washed cylinder can show zero compression)...

Title: Re: Gen Question
Post by verslagen1 on 09/26/13 at 19:22:29

get an eye ball on a stick and poke it down ol sparky hole to see the crank.

Title: Re: Gen Question
Post by Serowbot on 09/26/13 at 22:02:09

564552534C4147454E11200 wrote:

get an eye ball on a stick and poke it down ol sparky hole to see the crank.

You only get one shot at that... Right, Patches?... 8-)...

Title: Re: Gen Question
Post by justin_o_guy2 on 09/27/13 at 01:34:39

Remove the oil fill & shoot air into the plug hole..If it comes out the oil fill, your piston is leaking,

Title: Re: Gen Question
Post by foxx on 09/27/13 at 03:27:37

thanks for the tips, have a lot to get done and will get back to you on what i fined.