SOLVED = RD350 Running on 1 Cylinder : Advice

[m in sc]

did you ever check for spark w the plug pulled out?

[Milan]

Yes.
Sparks like crazy when laid on case while bike running on other cylinder.

Is there a way to measure this?

[Brad-Man]

What is your battery voltage?

[Milan]

Took the Battery out of the 250.
Put in.

Bike starts. One cylinder.
One kick.

Gracias

M

[m in sc]

probably a carb issue then.

[2t Fan]

stock points ignition ? engine having good compression ?

[Milan]

I believe its stock ignition & points.

Had borh carbs out & cleaned them.

Don't have a compression tester.
But even if low it still should start on that cylinder?

Is there such a thing as low spark?

Took other plug out.
Kicked bike over.
Get a nice blue spark

Other cylinder plug just gets a little spark.

So points or condensor?

[m in sc]

points are just a mechanical switch. if the condesor goes bad it will spark a LOT at the points when running. what is the voltage at the brown wires at the coil with the key on? I dont care if its a brand new battery.

compression shouldnt matter to get it to idle unless theres a hole in the piston.

make sure the wring at the points is isolated correctly as well. like this:



also make sure the gap is set to .3-.4mm.

[Milan]

About 12 volts at brown wire, that is common to both coils.

Orange wire on left side has continuity from coil to points.
Points are closing.

So where does the power come from prior to the points that makes the pulse?

[m in sc]

the points collapse the field,  that 'sends' the power to the plugs. so its from the battery. either your crankcase is full of fuel, exhaust is clogged (doubful) or your carbs need to be looked at again.

[Milan]

Not getting spark on left side
Spark produced using orange wire from point when contacts open & close.
Right?

Found this

Too wide a point gap decreases the dwell angle. This does not give the coil sufficient time to charge, resulting in a weak spark.

So time to order the tool & check the gap

M

[m in sc]

just use a feeler gauge and set gap. 

you said:

'Yes.
Sparks like crazy when laid on case while bike running on other cylinder.

Is there a way to measure this?'

now there's not.  this makes no sense.

[Milan]

Yes.

Confuses me too.

It was sparking when I first looked at it.

Now it is very weak, or non existent.

I will work on it again tonite.

M

[m in sc]

CHARGE YOUR BATTERY AS WELL, and look at condition of all wires and connectors related.  I chased a bad points-to-coil wire on my T500 for a few weeks, and it was intermittent.  repaired it, then put on a cdi anyway. lol.

[Milan]

Looks like it was a bad condenser.
Swaped leads & got spark.

Put RD250 one on, & both spark.

Must have had a short to ground on that side.
( single condeser, dual leads )