Have a kr 250 that has a very weak spark, won't run, any sugestions. Gerald

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

From start to end troubleshooting these problems I suggest you to check the help link below and follow its procedure: -----

Mostly all types of car no start problems are discussed here with solutions:---

CAR NO START: ENGINE NOT TURNING OVER:

http://alltypesofpartsreplacing.blogspot.com/2012/11/car-no-start-engine-not-turning-over.html

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These will help.

Thanks.

Sounds like your ignition module is the problem from what information you've given.

need 3 things to run
1. fuel
2. air
3. spark
loose any and it wont run, pull a plug wire off and crank it over.
does it spark? if yes good if no do same test with coil wire
disconnect fuel line stick hose in a bottle turn over, pump fuel? yes? good, no either filter clogged or pump bad

hi there mwb15
have you made sure the ignition coil is producing enough voltage to fire under compression load ?

you may get a spark at the plug unloaded but under load it may be breaking down / weak making you think its got a fuel problem ?

does your system use a cdi coil system or point/condenser system ?
spark usually falls into weak spark, no spark catergory

if compression , fuel ( you replaced carb) and exhaust are ok , and you have air and vaccuum tight c/cases only things left are timming and spark

remember F A C T S

F = Fuel A = Air & ( air tight c/cases ) C = Compression T = Timming S = Spark

compression should be about 130- 140 approx if in good running order

take a look and let me know

cheers pauly46

Engine will not run with no spark or a weak spark. Continuity test will only reveal that the winding is not open, not if you are producing a weak spark that will not jump the spark plug gap.

Anytime and engine dies, or is off, while the ignition key is still in the "run" position then the oil warning light should come on since there isn't any actual oil pressure in an engine that isn't running...so I dont think you have any problems related to that. What you'll need to know to diagnose this problem is if after the engine stalls if it is capable of making spark for the plugs when being cranked over. If it won't produce any spark while cranking then I would suspect the Hall Effect pick-up unit located inside/under the distributor cap as they are somewhat prone to failure and often will quit working when warm but will start working again after they have cooled off a bit. If you have spark when trying to restart the engine then its possible you have a fuel related problem such as a weak or failing fuel pump. Good luck, hope this helps a bit!

sounds like you have a poor earth connection, possibly between the coil and the frame, try quickly rigging up a cable from the mounting point on the coil, to a bare metal part of the bike (or nagative battery terminal if available), and try again.
Hope this helps

Put in a new spark plug and check plug wire connections and ECM ground connections.

You probably have weak spark and when bump started the plug sparks strong enough to run the engine.

A weak battey can also cause this. Your ECM needs a minimum of 9V to work. (the ECM gives spark and timing) When kicking over, there is not enough volts to spark. When bumping over the alternator provides the extra volts to start the bike.

Hope this helps!
Rob