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Weak spark,red spark not blue - Motorcycles

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  • Motorcycles Master
  • 532 Answers

Hi check power going to the H/T coils if good replace coils.

Posted on Apr 19, 2015

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Posted on Jan 02, 2017

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Weak spark. I have replaced ignition coil still the same.would the bike start if there is a weak spark


Hi Mark it depends how weak a good spark should be blue in colour take out the plug and remove the cap hold the plug lead close to the cylinder head and crank the engine. The spark should be able to jump between a quater to half inch from the lead to the head. The this and let me know how you go. Regards Jim...

May 15, 2015 | Motorcycles

1 Answer

Honda CR125 with Weak Spark @


Hi, Anonymous there is no such thing as a "WEAK SPARK" even though dozens of riders will swear that's what they have and are dying to show you, the bottom line is either you have spark or don't have spark there is nothing in between.
You won't see a dirtbike spark really well, and people only look at it when they have a problem. It is designed to fire under extreme pressure (13:1 compression) and is very robust, but it is not a 1mm bright blue line jumping across a spark plug. It can be white and very hard to see. If you are confident you have weak or no spark prove it by holding the plug in your hand and stark kicking you will be in for a "SHOCKING" surprise!!!!!
60% of these bikes have a flooding issue and/or a fouled plug. 30% need valves adjusted and most of the remaining 10% is something simple in the electrics like a broken kill switch, bad earth on the battery or dead battery, wiring at the steering head damaged or blown fuse.
For more information about your question and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
OT CR125 Has Weak Spark ATVConnection com ATV Enthusiast Community
https://thumpertalk.com/forums/topic/1051755-help-please-honda-cr-125-weak-spark
Honda CR 125R 2002 Sevice Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda CR125R 2006 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Apr 20, 2012 | 2003 Honda CR 125 R

1 Answer

1981 suzuki gs750l low spark but all spark get one big blue spark then small weak spark


Yep, that is alright as the weak spark is a wasted spark. It should goes on each ignition cable a STRONG then WEAK sparks. It is just fine in your ignition.
If you find this advise helpful then rate it please. thanks

Dec 09, 2010 | 1981 Suzuki GS 750 L

1 Answer

Engine starts and runs fine until i run about 5 pieces of branch


what color is the fire at the sparkplug? if it is blue it is good, if it's red that means that your spark is weak probably your coil is weak replace your coil

Jun 05, 2010 | Yard Machines 24A452G700 205cc Briggs ...

1 Answer

My craftsman 42in rider quits after about 30 to 45 minutes. The carb solenoid is good and the gas cap is venting ok. I have to wait about 20 to 30 minutes before it will start again. What should I check...


try the coil,does it get fire to the sparkplug after it quits and what color is the spark? blue spark is good, red is weak fire, and not enough to fire the engine up.

Jun 05, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Firing on one cyl. weak spark


does each plug have its own seperate coil? if so, i would say the coil for the weak cylinder is faulty

May 23, 2010 | 2001 Yamaha V Star 1100 Classic

1 Answer

I was riding bike stoped has compression and spark and fuel just wont fire is there something electrical that may have shat?


fuel, fire, and time.fuel in tank doesn't mean its making it to the piston,(dirty carb orfaces,or loose vacuum lines could stop fuel flow) fire needs to be blue not weak red or orange,(weak battery or blown fuse, low oil cut off) and timing must be still set within tolerance.

Apr 26, 2010 | 2003 Suzuki RM 125

1 Answer

How do I check if the coil on a 1981 suzuki 400 is working. When and where does it get its voltage from. Please try to send answer to my e-mail also. badazz66gto@yahoo.com Keith


use a noid light to show pulse at plugwire,or just unplug a sparkplug wiire plug it to a extra sparkplug let it ground on metal(frame or engine) spin the engine over watch for a spark on the plug, red is a weak spark blue is good.

Apr 24, 2010 | 1981 Suzuki TS 185

1 Answer

I have a 1985 honda atc 200s with a very weak spark which is white instead of blue. What could the problem be? And how do i troubleshoot all options to find the exact problem? Please help


Could be a number of reasons.

Weak battery
Weak alternator
Weak coil,
Weak leads
Bad connections to any of the above. Clean and grease with Vaseline Petroleum Jelly (which conducts electricity).

first thing to check though is that the points (if the bike/canoe has points and not CDi) are clean, flat and not worn down.

Other reasons concerning spark plugs, gaps too large or too narrow, wrong spark plug, old spark plug?

The title of your problem says 'Canoes', so if that is the case, please disregard! I didn't know Honda made powered canoes?

Dec 14, 2009 | GPS

1 Answer

Weak blue color


sounds like your blue gun is shot.

Jan 31, 2007 | Hitachi 43GX01B 43" Rear Projection...

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