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Bike cuts out when running on new plug and got a weak spark

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You just need to work backwards from the plug starting at the wire. You will find it as you test going back. Check voltages at each point.

Posted on Apr 20, 2014

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2 Answers

Weak fire on pocket bike


Hi, I do a lot with these bikes, I think if you are getting a weak spark there is a couple things to check. First, do you understand how it builds the power to create the spark? The magnet in the flywheel has to be very close to the magnito or coil, if the gap is too much it will cause a weak spark, if the magnet is weak, weak spark, if the coil is shorting internally, weak spark. If the plug wire is damaged, weak spark. I hope this helps you.

Jan 25, 2015 | Quad 47 cc / 49 cc Pocket Mini Bike...

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Spark plug fails after two hours of riding??


Either you got the wrong type plugs (too cold) and/or that bike is running way too rich! Time to use a tool like ColorTune to get to the bottom of it. Who normally works on this bike? If you don't do the work yourself, then better to take it to a reputable shop/mechanic.

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1 Answer

1987 harley davidson 883 sportster will fire but does not stay running


Hi Shane, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
Good luck

Sep 14, 2012 | Harley Davidson XLH 883 Sportster...

1 Answer

No/weak spark rear cylinder. new coil, plugs,wires. bike ran well for couple of days.


What do you mean/ How did you test no spark and weak spark? Does the bike run at all now. What history of the bike leads up to the present problems. Confirm that it is a 2003 DYNA. There is still a front and a rear plug wire even though wasted spark ignition but exhaust stroke spark is weaker than power stroke spark so do not have plug wires mixed up. Spark has nothing to do with air/fuel ratio so you have more than one problem from your information. What is cvp? what jets size do you have in the carb? Do you have only a stage one breather or a full stage one including exhaust??

How long does the enrichener have to stay on? How does it idle and how id its running performance with and without the enrichener on and how far on do you leave it etc?

Please post a comment with additional information and ALSO if you find the answer so others will share in your new knowledge etc.

Apr 07, 2012 | 2003 Harley Davidson FXD Dyna Super Glide

1 Answer

Weak spark and than no spark


it sounds like the engine is cooking up the plug,, if a new plug gets you started again once you have fitted it, its not the bike's spark,,,its the old plug,, its burnt out,i think the carb is running vey week,, and this makes the engine run very hot,,,it could melt a piston crown !!! have you tinkerd with the exhaust pipe in any way? as this will throw the card way out of tune,,,and they sound very noise too, if you try a hotter plug in the bike it should sort out this sparking problem,,,mine eat plugs at a set a week,,,i had the wrong pipes fitted to my bike when i got it,,,

Nov 16, 2009 | 2005 Honda CBR 125 R

1 Answer

04 suzuki rmz 250


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

Sep 22, 2009 | Motorcycles

1 Answer

My kawasaki zr 550cc is all of a sudden not starting, please help...would it be the fuse???Light switches on but no igition/power at all (bike is new to me) cheers


Check the battery, it may just be too weak to create enough of a spark. I would try putting it on a tender for a few hrs. You can also check the spark plugs. There may be a fuel cut off switch or a some of other kill switch too. Make sure the bike is in neutral as well

Aug 05, 2009 | 1991 kawasaki Zephyr 750

1 Answer

My suzuki dl 1000 k5 hiccups at 2200--4300 rpm


have seen this many times on different bikes. the manufacturers have to get their bikes to pass emission (pollution) tests, and noise tests. these tests are usually done at the same rpm, therefore the manufacturers program the ecu to make the bike run weak on fuel at that rpm. causes what we call a 'flat spot'

can think of no other reason or it would do it throughout the rev range. don't forget that after a distance on neutral throttle, the fuelling will be very weak as the bike doesn't need much then anyway. usual answer is to get ecu re programmed, or fit dynojet power commander, a plug in electrical box, will sort out all the rubbish and make it run properly. do a google search for dynojet and read their stuff.

Jul 08, 2009 | 2007 Suzuki DL 1000 V-Strom

2 Answers

My 98 Suzuki VL1500 has a weak spark to the rear cylinder. i've replaced plug, plug wire, coil, inition module, and stator. I've switched coils and plug wire from one cylinder to the other. The weak spark...


it is probably not a weak spark. if you are determing this because the plug is sooting up and fouling and or the bike is missing or just not running right. your carbs need rebuilt. know of same problem with friends bike. tried eveything. coils igniter etc.. check out g man industries.com give them a call they will explain what is going on with your bike

Jun 13, 2009 | 2001 Suzuki VL 1500 Intruder LC

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