Help!!!!! No Start

[Russ2251]

I'd bet it's an ignition problem...nothing more.
I could be wrong as usual.

 

[Desertduler]

I'd bet it's an ignition problem...nothing more.
I could be wrong as usual.

No,You could be right!

 

[OzFab]

I could be wrong as usual.

Russ, in my experience, you not wrong very often, if at all

 

[Newbie12]

if it was ignition problem why would i be getting spark
either way i will check today

 

[fowler]

It could be sparking at the wrong time

Or the spark isn't constant

Or it won't spark under very high pressure

Or it's not strong enough

I think u will find russ is right almost always

 

[Desertduler]

I guess you guys dont think that some of the statments I made are not real senarios?
They are indeed thats one reason why I should stay away from forums LOL!

 

[Russ2251]

if it was ignition problem why would i be getting spark
either way i will check today

You may be getting an indication of spark, but:
Is it happening at the correct time?
Is it strong enough?
Is it consistent?

The fact that raw gas is being introduced and is not firing tells me that ignition system (in some way) is faulty.
Low compression is a possibility, but very unlikely. Even with no compression you should get something!
I would strongly suggest checking timing...condition of coil and secondary wire and get a known good plug.
Use a non resistor plug if possible.

 

[Doc Sprocket]

I agree. I was introduced to such possibility once when I had to work on a truck that wouldn't start. It had spark (weak) and wouldn't even kick on ether. I went to great lengths to test sensors and all kinds of things. Eventually, I relented and swapped in another ignition coil. Fired right up. Spark was there, not strong enough.

I saw spark, then wasted a retarded amount of time testing sensors and whatnot. Don't assume anything.

 

[Poboy kartman]

I am wondering how this will come out. Hopefully the OP will let us know. I can't figure out how you can have spark and fuel without combustion. 2+2 does not=4 in this case. I keep going back to sand in the carb bowl and dry plugs, but direct fuel shots usually fire right off.
Maybe he should try again with carb cleaner. Could be as simple as bad fuel.

 

[Doc Sprocket]

It certainly could be old fuel. Or bad timing. Poor compression. Inadequate spark. We know he has spark and fuel. We don't know about the condition of the spark or fuel, or the other variables.

As an example off the top of my head: If your timing key has shorn, you can have a good strong spark, plenty of fuel, and no fire, no matter how many shoulders you dislocate while yanking your brains out. Bad timing.

 

[mymumisaman]

Sorry to butt in but couldn't you narrow it down? Use fresh fuel, clean filter, clean carb, new plug, and if that fails , put half a teaspoon of oil in the sparkplug hole (incase it's a compression issue) then try and start it, if it won't start after all this then it's got to be a timing/ coil issue,

 

[Doc Sprocket]

Sorry to butt in

Don't be sorry- that's what a forum (especially this one) is all about. People trying to help folks out. Always feel free to offer up an opinion, idea, or troubleshooting tip. Sooner or later, somebody will come on and say just the right thing that results in solving the problem. Might be you.

 

[mymumisaman]

Il remember that one thanks

Just read back through the post , it's a 2 stroke 125 bike engine, is the ignition a 1 wire points system ( old kind) or is it controlled by an ecu ?, the sand in the carb points too a dirty tank , best clean and flush it,

If it was my engine then I would be taking the head off to see if any sand might of got into the cylinder, could of blown a piston ring,

 

[Desertduler]

Sometimes with a stuck piston ring you will get nothing.
Been there!

 

[Newbie12]

Okay so checked for spark again today and I loose most of spark as soon as i touch it to the block. If I hold it a 1/2 inch away it will spark onto the block great but touch it and looses almost everything

Saw a video on YouTube called No spark when grounded? And same issue and everyone is saying short in the plug


I will try this and let you guys know Thanks for the help so far.

 

[Doc Sprocket]

What should be- holding the threaded portion of the spark plug to a clean bare portion of the block or head, should exhibit a nice blue spark jumping from the center electrode to the side electrode. If this is NOT happening, first try a different spark plug. For testing purposed, take one out of your car, it's doesn't matter they type or rating.

Once you have verified spark, and if test shows good, go buy another spark plug of the correct type, set gap, and install.

 

[Newbie12]

I also noticed I get a bit of a shock once in a while when turning key on the part where it says start

 

[Russ2251]

I also noticed I get a bit of a shock once in a while when turning key on the part where it says start

You're getting close to the problem. Shock at the switch is a BIG hint.

 

[OzFab]

It sounds like you have some major electrical problems; at the very least, the whole system isn't grounded properly... &, yes, that would cause ignition problems...

 

[Newbie12]

okay from what i have tested with a test light all my grounds that i know of are good im going to try a new plug tonight and ill go threw the wiring again,

when testing for ground should i be cranking engine over or?