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1974 Honda XL100 no spark

I have a 1974 honda 100 XL I did a new coil and new points but no spark do I need to trim the cord or set the points if so how do I set points @

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  • Honda Master
  • 44,683 Answers

Hi, Adam and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
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 pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Faulty run/off switch
11. Tilt sensor needs a reset.
12. Security alarm failing to disarm needs reset
For more information about your issue 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.
1974 honda xl100 no spark
How to Check for Spark
http://www.backendgeeks.com/1974/1974-honda-xl-100-service-manual.pdf
https://www.partsfish.com/page/oem-parts-for-honda
http://www.splendidhotelrwanda.com/honda-xl-100-owners-manual.pdf

Posted on Jan 07, 2018

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Posted on Jan 02, 2017

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SOURCE: 1974 porsche 911 2.7L ignition trouble

Post your problem on pelicanparts.com in the 911 tech forum area, great help here.

Jim

Posted on Aug 09, 2008

flh1
  • 36 Answers

SOURCE: were points are located and how to change points on 1974 harley s

1979 Sportsters were electronic no points unless they were changed during the life of the bike.
If it is points they are located on the right side of the motor under the little round plate.Points set @ .018 with the piston a TDC.Either use a screw driver in the plug hole or take the timing plug out and set the flywheel mark ( the line or the dot)inthe center of the hole.Set points.If you cant find the marks or the hole take it to a shop

Posted on Dec 27, 2008

  • 29 Answers

SOURCE: wiring harness 1974 sportster???

I am assuming your bike is stock, or close to it. In 1974, all h-d's used a battery coil ignition with wasted spark. Battery positive flows from the ignition switch to the coil, through the coil primary winding to the points, then open or shorted to negative (through the chassis) depending on the points being open or closed. When the engine is turning over, this is what happens: The small cam that operates the points has the points in the closed position, so battery current is flowing through the coil primary, through the closed points to negative. This causes the primary winding inside the coil to set up a magnetic field. When the cam starts to open the points, the current tries to bridge the gap. If we let this happen, the big arc between the point surfaces would burn up in a hurry, and the plugs would not fire for the following reason: The ignition coil is a transformer. It has a primary and secondary winding.The secondary winding has many more turns of wire than the primary. When the secondary winding "cuts" magnetic lines of force a larger voltage is induced in the secondary. In the case on your sporty, we are boosting 12 volts to over 10,000 volts. This depends on 2 things: The number of lines of force and the speed they are cut. So, when the points just start to open, the condenser absorbes the current until the points are open enough to prevent arcing. Then the current flow through the primary winding stops. The magnetic field quickly collapses, cutting through the secondary windings that are connected to the spark plugs. The resulting high voltage (pressure) Jumps the gap on both plugs and lights the fire. One of the cylinders is on the exhaust stroke so that spark is wasted. So: ignition on : 12v at coil positive. With points closed, 0 volts at coil negative. If you read voltage here, the points are dirty or open or the wire from the coil to the points is open. Points open: 12 volts at coil negative. To check for spark, you don't have to crank the engine. Just manually opening the points should fire the plugs. After you get the plugs firing, post again and I will tell you how to razor tune this thing. It should start instantly with a perfect idle. Hope this is clear.

Posted on Jan 01, 2009

  • 1 Answer

SOURCE: no spark

alrighty, I had the same issue with my bike. It took days of tracing the issue with a volt meter and I discovered an intermittent short that would "fry" my coi. This made the bike not start and when I replaced the coil, because I had removed the old coil and moved the wires the issue disappeared for a short time. It is known that SOMETIMES when the coil is mounted the two wiresthat go to the coil somhow get stretched. This over time cause an intermittent short and the coil is rendered "dead". The Fix: 1.get a replacement coil. 2.you need 6 inches of #18 wire 3. two aluminum wire splicers and two aluminum circle fittings for the coil posts. 4.take off the old coil. 5.cut back the wires that go to the coil about an inch. 6. using the aluminum splicers splice the wires making them about 3 inches longer. 7.splice in the aluminum circle fittings. 8.mount the new coil. 9. fire the bike up. Enjoy riding.

Posted on Jun 06, 2009

  • 1 Answer

SOURCE: Points gap setting

0.6 mm

Posted on Jun 16, 2009

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I bought an old 1982 honda XL 125s and it has been starting first kick every time..


Hi, Jeff nice novella 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.
Honda XL Troubleshooting Spark Issues
What to Do Check When Dirt Bike Won Start
Honda XL 125 V1 Shop Manual
http://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda/227

Mar 10, 2017 | 1985 Honda XL 125 R

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Honda GC190 can't pull starter cord


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1974 honda 550 four will not start no fire to the plugs


Make sure you have a fully charged battery. The ignition system on a Honda draws it's power from the battery not the charge coils. Start by replacing your points and condenser. You probably have shorted or grounded points which translate to no spark at the plug. New spark plugs and spark plug caps (caps unscrew off of the end of the wire) will also increase the efficiency of the spark.

Sep 26, 2011 | 1974 Honda CB 200

1 Answer

The bike is starting only with small plug gap.If we set the gap to original it wont start? tell me the reason?


.....A weak battery comes to mind for starters. A carboned up spark plug is another; start with a new spark plug. If I recall correctly from 39 years ago, your bike has ignition points and condenser. Remove the points cover (on left end of the overhead cam), and check the points. Burned? Pitted? Get a new set of points and condenser but for now, just file the points a bit using an emery board or metal fingernail file. Set the points to .015 clearance at the high point on the cam lobe. If you have a timing light you could check the timing and adjust as needed by rotating the points base plate left or right. Bad points give resistance to the flow of electricity. When the points are closed, the condenser gets charged up. Less electricity going through the points means less of a charge going into the condenser. Now the points open up and the stored charge goes from condenser to coil. The coil then produces a spark. With a low charge in the condenser, the spark is weak and will not jump a wide gap. Set the plug gap to very little and the weak spark can jump the gap. The standard gap is .028. ....... I don't recall when Honda move the points to the flywheel but the images below may help if your bike is that style. Clean any rust on noted parts; magnets and pick up coils. Okay, now I have done my part. Now you gotta do yours; please rate my answer. Thanks! tombones49_177.giftombones49_178.gif

Jun 15, 2011 | 1972 Honda CB 100

1 Answer

I have power coming to the coil, pints but no spark. There is a new battery and coil in it so I`m stuck, please help


Try a new spark plug cap and for that matter a new plug(wet fouling is common with ethanol fuel) should only cost about $5-$10. I have seen people reinstall points 3 or 4 times before they were able to get spark. make sure the points are installed correctly and not grounding out.

Jun 02, 2010 | 1974 Honda CB 200

1 Answer

Just got a 70honda cb 100 has no spark been


make sure kill switch is not killing spark even in the run position. Chech all fuses (test them) make sure power to and from coil is there. the CDI is not repairable but could need replacing.(not sure if the cb 100 has this with points) is the condenser good? if it is it can be charged and discharged with a mulitmeter.(use ohms resistance to charge it and volts dc to read as it discharges CAREFUL it can BITE)

Apr 22, 2010 | 1970 Honda CB 100

1 Answer

Put new ignition coil on, however still no spark


Im sorry you are having this trouble with your CB 100. I had a CB 100 from '71.

So you have power going to the coil? How are your points and condenser. I think your trouble is probably your condenser complicated by points that are not properly set. Set the points to .035.

Check these things and try again.

FYI, there is a Honda Riders Club sponsored by Honda and free to browse. If you pay a few bucks and joinn the club, you will get immediate access to service manuals for your model, according to information posted at the site.

http://hrca.honda.com/

Thank you for posting your question at FixYa.com

Nov 08, 2009 | 1976 Honda CB 100

1 Answer

I have a 1974 dt 250 same as an dt 360 the bike has sat in a barn about 4 yrs it will not start removed and cleaned the gas tank went thur the carb new plug used ignition coil compression about 50 to 75...


Compression is too low!

Replace the piston rings.

Also check continuity from engine to frame till high-tension coil...
Check if breaker points aren't dirty ( clean out with fine sandpaper )
Check breakerpoint settings

Oct 31, 2009 | 1974 Yamaha DT 360

1 Answer

My 1974 Honda XL 100 runs well then quits. I checked the fuel system and cannot seem to find a obvious cause.


Check that the carburetor is getting ample supply of fuel from the tank. Sometimes a clogged tank vent or partially blocked petcock(causing slow flow) can cause symptoms similar to yours.

Aug 12, 2009 | 1983 Honda XL 125 R

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