Question about 2005 Honda CRF 100 F

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No spark or very little spark, could it be the ignition switch ?

No spark or very little spark while kicking over the engine with switch on. bike won't start. suspect ignition switch or coil?

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  • 85 Answers

Try new plug .,plug could be fouled.,.,if not prob coil, or stator,cdi?

Posted on Jan 05, 2017


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Posted on Jan 02, 2017

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SOURCE: CBR 250R Not Starting

better to clean plugs with petrol and a brass wire brush, you may need carbs cleaned out if it has been left sitting with stale fuel in them

Posted on Mar 08, 2009

  • 3567 Answers

SOURCE: Honda CRF150F will not start

ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Flush out the gas tank if needed.

Drain the carburetor. There should be a screw on the lower side or bottom of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. Post a comment to get back to me.

A “very helpful” rating on this answer? Thanks!

Posted on Jul 03, 2009

ollie reece
  • 1167 Answers

SOURCE: 85 xr 600 wont start appears to have no spark had

yes buddy it the coil not making a strong enough spark say its only making 1000volts insead off 15000volts example hope this helped buddy

Posted on Sep 17, 2009

  • 301 Answers

SOURCE: honda 1986 vf400f nc13 engine front two cylingers not firing help

If the spark appears to be weak only for the two front cylinders, then I would suggest checking the electrical connections for the ignition coils.
If the spark for the other two cylinders looks the same (yellow), then I'd suggest checking the compression on the non-functioning cylinders. A compression reading of 140~160PSI is what you're looking for. Low compression indicates internal engine damage - or could be from something relatively simple - like insufficient valve tappet clearance.

If the bike has been sitting for a long period of time, it could be that the carburetors are plugged up with fuel varnish. This can cause some cylinders to not run. A complete carb disassembly and clean-out will be needed.

Posted on Oct 23, 2009

Testimonial: "thanks for that feed back . there is plenty of fuel and compression is non existant on front left and 80 psi on front right,I suspect cam wear????"

SOURCE: spark plug cap

Well there is no problem continuing using the bajaj spark plug cap,this can probably happen due to hot from the engine,and the cap DISINTEGRATION.I advice you to use the bajaj cap see how long it last compare to your original unicorn cap.

Posted on Mar 27, 2010

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Cold engin, started with ign switch, bike was in n, kick std up, kept idling out. Bat good, fuel good. won't even turn over. Manual said to ignite with throttle all the way open, tried that, no go


Jun 18, 2015 | 2007 kawasaki ZZR 600

1 Answer

Why dont I have spark? V Star 1100 First lost my keys, had to hotwire bike, (still hotwired maybe this is the fault for no spark?) As the days passed I noticed the bike having more difficulty starting

Hi, Kahmaar nice novella sorry to hear about all your problems that were self-inflicted and yes you may have fried the ECM when jump starting with a running automobile and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting, leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
No Spark Whats Wrong
How to diagnose no spark situation on motorcycle
OEM parts for Yamaha OEM parts for Yamaha

Mar 12, 2017 | Yamaha V Star 1100 Classic Motorcycles

1 Answer

I have a 2001 Suzuki with no spark how do I check the stater and coil for ohms to see if they are bad?

For checking the ohms you will need the repair manual. Should be there the values and the "how to".
First you should ckeck the on/off button to see if him is the fault.
If you don't know that you have spark or not you could check that easily. If the bike has starter is better. If not, you will need a second person to kick the bike and another one to watch the sparkplugs. The checking method is next: remove a spark plug and fix it on the engine everywhere you want but be sure that the sparkplug ( the wrench zone ) is on metal surface but the electrode should be in the air ( not touching the engine ). In this time press the starter button if the bike has starter or kick the bike. If in this time you see no spark on the elctrode gap that means the problem is the spark, coil, the ignition coil itself or the wires that power the ignition coil. How to check that? By purchasing the repair manual for you bike.

Oct 20, 2013 | 2003 Suzuki RM 125

2 Answers

I have replaced the battery and ignition unit on my 1985 suzuki 700 es, the bike really sounds like it wants to run but wont start. Starter turns but engine won't kick over. Any Ideas?

Is it getting gas properly? Has it been sitting around for a while? The carburators on motorcycles need to cleaned after sitting around. The jet could be full of varnish. Are you getting spark for sure? Pull out a spark plug and put it in the wire, crank it over and see if the spark plug sparks. When you pulled the plug was it wet at all with gas? Then it probably isn't getting gas right. Just some of the things you could try.

Feb 12, 2012 | 1985 Suzuki GS 700 ES

1 Answer

1980 z250c bike turns over no spark

Possibilities are; handlebar kill switch is grounding out, kick stand kill switch is broken or needs adjusting, a bad spark plug, power wire to ignition has come unplugged, bad ignition switch, ignition system needs service, coil or coil wire has gone bad. This list is in sequence of likelihood.

Mar 14, 2011 | 1981 kawasaki Z 250 C

1 Answer

Once in a while when starting the bike I get a lound grinding noise and obviously it wont start have to wait a while and then it may do it again or it may start. The noise is very lound

This problem is not as common on the Evolution and later engines as it was on the old Shovelhead engines. What causes the problem is the engine trying to start and "kicking back" against the starter. This will cause the starter drive to disengage with the starter ring gear on the clutch while it's trying to turn the engine. The noise is frightening and sounds like something tearing itself apart in the primary.

Like I said, the Evo and later engines don't do this as badly as the earlier Shovelhead engines did. Usually, the stock ignition system has to wait until a few revolutins of the engine occurs before the plugs start to spark. That's the purpose of the compression sensor on the Twin Cam engines.

Now, since you didn't tell me exactly what year model bike or ignition system your running, I'll generalize my answer. If you're still running the stock ignition, I'd check the timing on the engine and make sure it is not set too high. If you have an aftermarket ignition system, check the timing on it as well and if it is equpped with an "electric start / kick start" switch, make sure it's in the "electric start" position. This would probably only be revelent if you're riding a Shovelhead.

Like aaid earlier, this does happen from time to time but if it's happening too often, check the ignition system on your bike. Good Luck, Steve

Apr 25, 2010 | 2001 Harley Davidson FLSTC - FLSTCI...

1 Answer

Purchased a Yamaha 2003 TTR 225 on Saturday and it ran perfectly. Sunday it started up & cut off and we have not been able to get it started since. We know very little about dirt bikes except the...

Check the spark plug to see if is sparking. Hold the metal threads against the metal cylinder and have a friend kick the engine over. If no spark, use an ohmmeter to check the kill switch on the bars and also the side-stand kill switch if your bike has one. Check the wires for a loose connection or disconnected wire.

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  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • the throttle, used to prime the cylinder, (power valve).
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm, (Power valve), in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), for six kicks. After six kicks go ahead and twist the throttle again for a second priming. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting. Note that not all carbs have a power valve. When a power valve is not present you should crack the throttle open only 1/8 inch from closed on each kick. Please take a moment and rate my answer. Thanks!

Dec 21, 2009 | 2003 Yamaha TT-R 225

1 Answer



Remove both sparkplugs from engine. Plug them back in the sparkplug cables and let them rest on the engine.
Make sure your battery is well charged.
Check for sparks while kick-starting...
Interchange the sparkplugs in the cables:
-Same plug give sparks: replace the spark plugs.
-Same side of engine sparks: interchange the low-voltage connector at the ignition coils.
Give it a try:
Same engine side sparks: Replace the defective ignition coil.
Other side of the engine sparks: Check the circuit harness for loose connectors, and/or Clean-replace the breaker points ( left side of the engine carter ).

Aug 28, 2009 | Yamaha RD 350 Motorcycles

3 Answers

Its getting dam near impossible to kick start, it will start after 30 or so kicks, any ideas?

Could be low compression due to head gasket leak, worn piston rings. Or bad spark due to dirty plug, wrong gap, plug breaking down, lead or cap breaking down, ignition fault. Choked air filter, fuel filter.
Try these in easiest order I.E. remove air filter and see if it starts easier, do a compression test, cahnge plug, lead cap. Check the fuel filter.
I am sure it's a simple solution.(high milage engines tend to be difficult to start so take this into account)

Jun 27, 2009 | 2004 Honda CRF 450 R

1 Answer

Bike only fires once

Okay, let's have a look at it. Say Ahaaa.
The probable cause of the problem is not the spark. Get a fresh set of Stock NGK spark plugs, ground the plus to the engine, and check each cylinder for spark as the starter button is pressed for 3 seconds or so. I will wager that the spark is present.

The likely problem is the fresh gas was put into a very rusty gas tank. Bits of rust now inhabit your carb and are having fun plugging up the carb. Look at the gas valve. With a little luck there is a small bowl behind the valve. Remove it and tell me what you see in the bowl.

Apr 11, 2009 | 1982 Yamaha XS 400 SE

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