Question about Honda CB 100 Motorcycles

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Engine dies Starts well then the engine dies after a short while. Starts with good blue spark which then turns weak and yellow. Any suggestions as to what could be wrong with it?

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  • 11 Answers

Check the coil resistance

Posted on Jan 24, 2013

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Posted on Jan 02, 2017

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SOURCE: engine stutters when turned on

To adjust the throttle position sensor, switch ignition 'on' then disconnect and reconnect the the connection at the TPS. Loosen the TPS fixing screws  x2 and swivel the sensor until the rev counter reads 5000rpm.Don't switch the ignition 'off' during the procedure as this sets it back into 'normal' mode. If you can't get a proper reading then it could be the sensor is faulty.   The TPS is on the left hand carb spindle.

Posted on Mar 06, 2009

  • 379 Answers

SOURCE: loses spark intermittant

100,000 miles? Maybe rebuild time!! You sure it isn't something simple like a plugged gas tank vent? (Try it with the cap off) Bad plugs? Wires? Coil? Plugged fuel filer or in-tank screen? Are you absolutely sure it's a spark problem and not fuel related?

Posted on Jul 08, 2009

  • 3 Answers

SOURCE: bike wont start

I posted this for a similar problem, maybe it can help. Are you sure it's getting gas to the carbs? Some people don't realize the 99-02 SV650 has a vacuum-actuated fuel pump, and sometimes it can get stuck. Mine has had this problem, and it took me a while to determine it was the problem. I would guess it only happens after the bike has been sitting a while (ours unfortunately sat for a year or so without being run).

Best way to check it is to lift the tank (it's bolted to the frame on the right side of the engine just under the tank). Unplug the line toward the front of the motorcycle from the fuel pump, and connect some spare fuel hose to it running to a can next to the bike (don't want to get gas everywhere!). With everything else still connected, crank the bike for a short period to see if any fuel comes out (shouldn't take long). If not, then move backward and ensure fuel will flow from the vacuum-petcock when the bike is cranked. If that does work, your fuel pump needs some work. I was able to take mine apart and unstick it.

Posted on Oct 01, 2009

  • 434 Answers

SOURCE: engine dies

Next time it cuts out, open the choke and see if it takes off again. If so, the carbs are dirty. If not, sorry I couldn't be of more help.

Posted on Mar 12, 2010

  • 5 Answers

SOURCE: Weak ignition spark

Make sure battery is up at least 11 - 11.5 volts
A low battery will spin over and sound like it should when cranking sometimes, but the starter will rob spark from the ignition and not fire due to low voltage

Posted on Jul 17, 2010

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Huskee LT4200. Turns over. Why won't it start?

Any combustion engine needs 3 things to run...Spark, Fuel, and compression. You need to figure out what you are missing. Easiest thing to check is spark. Pull the spark plug and hold the metal base against metal engine casing, and making sure you are holding onto the insulating rubber of the boot, have someone help crank the engine over while you hold the plug there. Look for a good strong blue to white spark at the plug gap. If you have no spark or weak yellow to orange spark you will need to look into the ignition system. New plug is the cheapest and easiest thing to change and test again. If it is still a weak spark then you will need to look to the coil/ ht lead, igniter box, or pick-up. While the plug is out, you can check for compression in the cylinder. If you end up having good spark and good compression then you look to the fuel system. If you can't find a problem with your fuel system, your fuel, spark, and compression also have to happen at the correct you check your timing marks. Simple steps of engine trouble shooting.

Jun 30, 2015 | Cars & Trucks

1 Answer

Engine died while driving, no spark, replaced coil, now starts, idles, runs well at low rpm, but misfires when accelerating. No check engine costs thrown. What should I check next.

Change your ignition module. The distributor is a weak point of the Honda, I will always change out the whole thing than just try the coil.

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1 Answer

John Deere LX178 Lawn tractor Surges and Dies

It sounds as though the coil is heating up and shorting out. Do you know how to get to the coil to replace it? Anyway check the coil by inserting Phillips head screwdriver into the coil wire, hold by the handle so wire is 3/8 to 1/2 inch from the cylinder head or bolt and crank the engine and look for blue spark. No spark or weak yellow spark the coil is bad. Do this check the next time it quits on you. If you need instructions on how to get to the coil, get back to me. Hope this helps, plese post solved on I get credit for a solved problem if it does. If not, check back and give me more info.

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1 Answer

My audi a6 avant 1.8 turbo has a starting problem

Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.

Also it can be weak battery or starter.

But possibilities are to be inspected to confirm what exactly it is.------

To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------

Click the link below:------

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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: -----

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These will help.


Dec 09, 2012 | Cars & Trucks

1 Answer

I have a 4 cyclinder fuel injected vortec engine in my accord ,my car is dumping to much fuel which fouls out my plugs n black fumes is coming from the tail pipe.there is plenty pressure coming from the...

You need to check that the spark plugs are in good condition and check the spark (spark should be blue = good, yellow = weak spark ) Is there an engine light on? if the plugs are black this is a rich condition (to much fuel, or fuel not burning) the spark plug wires could be bad, weak ignitor,

Aug 23, 2011 | 1997 Honda Accord

1 Answer

I have yukon 95 . its engine doesnt oerate will it comes with black smook

Probably engine is misfiring. Check spark plugs and wires. Check distributor cap and rotor.
Check spark at plugs. Should be a blue spark and not yellow. A yellow spark is weak ignition coil.

Sep 14, 2010 | 1995 GMC Yukon

1 Answer

Turns over but won't start

pull out one of the spark plugs plug it in to plug wire run a jumper wire to the body or hook of the plug to ground the jumper must go to a suitable ground. pull out pcv hose to prevent car from starting have an assistant turn over the engine while you check for a strong blue or purple spark if the spark looks white or yellow there is a weak ignition condition and this must be adressed, bad ignition module bad cap and wires, etc. do the cap and rotor first if the spark is weak. If there is a strong spark sometimes holding the gas pedal to the floor while turning over the car for no more than 10 seconds starts stubborn motors do not let up on gas if car begins to start not until the motor starts to rev up.

Jul 20, 2009 | 1993 Dodge Shadow

1 Answer

I have a Honda SH50. It starts fine, goes for a

It has all the symptoms of an electronic failure. I would suspect the pickup coil in the engine , coil or trigger box. You can check the pulse coil,
AC volt scale, something a little less than 1 volt when you turn the engine over. Two wires from the engine, don't have a diagram for your bike handy , sorry. Pulse coil triggers the ignition box that fires across the primary of the coil. Check spark plug cable and where it enters coil and cap for corrosion first. Next time it quits, have a spare good plug with you, insert the plug into a plug wire you've removed and be sure the plug is grounded then try to start the bike and see if it has a nice blue spark. If it's yellow or red, weak spark meaning something in ignition circuit failing. You can test coils with resistance VOM meter if you can find the specs. Good luck!

Jun 10, 2009 | 1990 BMW K 75 S

1 Answer

RX7 with 13b engine is hard to start, idles fine, dies on accel.

problem like this on garden tractor ,was weak coil ,-when engine at low manifold pressure[idle] spark could jump gap and fire cylinder ,higher pressure /under load-wouldn't fire...check color of spark -orange,yellow ,white spark=weak, blue spark is stronge,

Mar 22, 2009 | 1984 Mazda RX-7

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