Question about Motorcycles

Open Question

Yamaha yz 400 how do i test the source coil,with a multi meter,it only has one wire coming from it?

Is the pulse coil grounded to the plate?and does the source coil only have one wire?ibefore i got the magneto flywheel off i shot some cleaner in there ,and when it was wet ,i got spark,when it dried ,no spark.

Posted by on

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 163 Answers

SOURCE: no spark

remove the ignition coil from the bike.

The primary winding should have a resistance between 2 and 6 ohms
The secondary winding should have a resistance between 19Kohm and 40Kohm.

In fact the primary must have less than a 50ohm, but there MUST be a resistance.
The secondary should have a resistance of 15.000Ohms and more, but there MUST be a continuity.

Posted on Apr 02, 2009

  • 1 Answer

SOURCE: ignition

I hope this diagram helps, it did me!


Posted on Jul 24, 2009

  • 1 Answer

SOURCE: 19-95 KLF300 ATV Kawasaki 4x4 no spark put new ignitor unit on.

i ******* hate my kawasaki kdx 125 1992 there is no spark and i dont no wot it needs ive bought a cdi for it an it wernt that and i bought a new coil and it wernt that either could anyone help me please

Posted on Sep 11, 2009

ollie reece
  • 1167 Answers

SOURCE: Bike wont start

hi buddy to check the magneto just find the wires from the magneto and test them out with a volt metre if you have nothing there must be the stator plate gone get back to me buddy

Posted on Sep 20, 2009

  • 414 Answers

SOURCE: rm125 1999 no spark

what comes out of CDI box? if you have it going in it is rectified and more will come out. If not change CDI

Posted on Mar 07, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Ive noticied that my plugs are not firing why ? coils?

Hi Michael - definitely could be. Do you have access to/familiar with a multi-meter for electrical testing? For the basics - a $15 multim from anywhere will do. There's a few standard diagnostic steps I can walk you through to get a general idea of what's going on. There are numerous things that can prevent you from getting fire to those plugs. I know this isn't the most interesting task - but the first thing you should do is get your seat and as much of the plastics as possible off - and go from wire to wire checking your connections. Grounds, everything. GIve everything a good look over. You wouldn't believe how many times I've seen this type of situation be simply a loose ground wire - or a break in a wire/melted wire - you name it. If you can let me know about the multi-meter and give that thing a good walk around - tug, poke, move around - don't be hesitant. If something comes disconnected or a wire breaks, comes out of a connector, etc. - all the better. It was going to do that eventually anyways. It's a good way to get familiar with the machine and to at least eliminate the simplest causes first. All The Best - and Good Luck - Justin McCartney 17 South Industries, LLC

Jun 14, 2016 | Yamaha V Star 1100 Classic Motorcycles

1 Answer

2000 yamaha kodiak 400 4x4 atv

Make sure everything is connected and there is a good fuse in place. To test the coil you'll want a Ohms meter and a Volt meter as well as the service manual! Make sure the readings on the meters match the ones in the service manual. Cheers!

Jan 04, 2014 | 2004 Yamaha YZ 450 F

1 Answer

Kymco like 200 i scooter wont start

You don't have to be tech savvy to troubleshoot the coil.
You'll need a multi-meter that reads resistance; which is measured in Ohms. Borrow one or buy one at Radio Shack, they're inexpensive.
You'll also need to know the primary and secondary resistance values of the coil; which is usually found in a repair manual- perhaps even in your owner's manual.
If you have neither, call the scooter dealer, make sure you tell him the year, make, and model of your scooter and that you need the primary and secondary resistance values to the coil on your scooter.
Once you have the multi-meter and the specs to the coil; it's time to set up and run some tests.
Locate the coil on your scooter- follow the two leads that come out of the coil until you come to the plastic connector. Disconnect the connector.
With your multi-meter set up to read resistance- take a reading across the two coil wires; if the reading is within the manufacturer's specs (plus or minus 20 %) the primary side is okay.

To check the secondary side of the coil, leave one of the tester's probe attached to one of the coil's wire; detach the spark plug wire from the spark plug and attach the other tester's probe into the spark plug wire's terminal's end; and read the meter; if it is within (again, plus or minus 20%) of the manuals specs, the secondary side of the coil is good.

Therefore the source of the problem is NOT the coil.

Jiggling the kill switch? Are you referring to checking for loose or damaged connections?

Other possibilities; worn or melted wire grounding out at the switch- bad stator; rectifier, or CDI box. How tech savvy are you and mechanically inclined? Because you will need a repair manual to guide you through the troubleshooting process.

Unless you know how to read schematics and use your multi-meter- it could become an involved process- you may just want to bring it in for servicing to the dealer

Nov 26, 2013 | 2011 Kymco Like 200i

1 Answer

2009 Yamaha FZ6R code 33

Hi, Jason you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue. Multi carbs bank should be bench "SYNC"
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes, multi-cylinder engines should be within 10-15% of each other if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or it's counterpart for integrity.
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.
DESPERATE FOR HELP Running on 2 cylinders
Running on 2 Cylinders What to Do
Yamaha FZ6RC Service Manual
OEM parts for Yamaha
Yamaha FZ6RY Owner Manual

May 22, 2017 | 2009 Yamaha FZ6R

1 Answer

No spark on 750 honda saber

In no particular order: Check kill-switch on handlebar cluster. Check fuses. Check for loose or corroded wiring harness plugs. Check for bad pulse generator(s). Check for water in spark boxes and proper orientation.

Power comes from the fuse box to the handlebar cluster kill-switch. Check for power at the switch and after the switch with a test light or meter. If switch won't pass voltage, disassemble and clean then lubricate with silicone grease and reassemble.

Check each fuse with a meter. Remove the fuse, don't just measure it in-place. Glass (tubular) fuses can look good but still be blown. Test each one with an Ohm-meter out of the fuse panel. Same goes for newer blade fuses - pull them out and test. Fuse panel itself for blade fuses can be bad. These corrode and fatigue, cracking as base of spring contacts. Must fix fuse panel if bad as no new ones are available.

Remove seat, side-covers & tank then unplug, clean, and reconnect all multi-terminal wires going to/from steering head and coils/spark boxes. Double-check fast-on terminals at coil contacts. Double-check main ground connection to frame (under coil bracket).

Pulse generators inside right crankcase cover can fail and not send position pulses to spark boxes - pretty unlikely though. Check for continuity on each. Should show some resistance - not open. 2 pairs of wires - one pair to each pickup coil.

The spark boxes may be located either on rear fender liner under seat or one here and second one in a pocket on top of the tool-box depending on year. Spark boxes should be mounted with drain hole down and care should be used not to get water in them while washing (why would you wash a Sabre anyway?) Corrosion inside spark boxes is common on these. Some can be repaired but no new ones are available and haven't been for several years.

Aug 10, 2013 | Motorcycles

1 Answer

Car stopped while driving. Tried to start it , but to o avail. Turns over , but no spark. Changed coil changed distributor changed rotor and still nothing. Any ideas?

Hi, you will need a voltmeter to diagnose the problem. Set your meter to DC, turn the key on, and check the voltage at the positive coil terminal (black wire with white stripe) with the other probe at engine ground. If no battery voltage, suspect your ignition switch or fuse. If you have battery voltage to the coil, next set your meter to AC and check voltage across the coil primary winding (black wire with white stripe and other black wire) while someone cranks the engine. You should have at least 1 volt AC or more. If no AC voltage, suspect your crank angle sensor inside the distributor. The distributor would have to be replaced, so you would want to be sure it's bad. There are some specific tests you could run, but I would need to know the exact engine you have to provide correct test procedures.



E16i, CA16DE and CA18DE Engines
See Figures 1, 2 and 3


Fig. Fig. 1: Crank angle sensor testing terminals-CA16DE engine


Fig. Fig. 2: Crank angle sensor testing-E16i engine


Fig. Fig. 3: Crank angle sensor testing-CA18DE engine

  1. Disconnect the CMP electrical connector.
  2. Turn the ignition switch to the ON position.
  3. Using a voltmeter and check the CMP power source between terminal B and a known good engine ground. The voltmeter should read approximately battery voltage.

    If reading is as specified, proceed to the next step. If reading is not as specified, check power supply circuitry.

  1. Turn the ignition switch to the OFF position.
  2. Using an ohmmeter, check the CMP sensor ground circuit, by connecting the meter between a known good engine ground and terminal:

    E16i engine- terminal D . CA16DE and CA18DE engines- terminal A .

  1. Continuity should exist.

    If continuity does not exist, repair open in ground circuit. If continuity does exist, proceed to the next step.
  2. Start the engine.
  3. To test the sensor 180° signal, connect a logic probe between the following terminals:

    E16i and CA18DE engines-ECU terminal 17 and a known good engine ground. CA18DE engine-ECU terminals 21, 31 and a known good engine ground.

  1. To test the sensor 1° signal, connect a logic probe between the following terminals:

    E16i and CA18DE engines-ECU terminal 8 and a known good engine ground. CA18DE engine-ECU terminals 22, 32 and a known good engine ground.

  1. The logic probe should indicate that a pulse signal exists in both tests. If a pulse signal was not present, inspect wiring. If wiring is okay, replace the crank angle sensor.

May 21, 2011 | 1987 Nissan Pulsar

1 Answer

Rm125 1999 no spark

what comes out of CDI box? if you have it going in it is rectified and more will come out. If not change CDI

Feb 25, 2010 | 2003 Suzuki RM 125

2 Answers

Have no spark. Changed coil & CDI box so far. still no spark. Is it the internal coil? 1989 enticer 400T/R

Hi and welcome to FixYa,
Initially, suggested checks on the wires:
  • black of igniter unit tied to ground;
  • orange wire from igniter to ignition coil with pulsating voltage when starting;
  • gray wire from igniter to ignition coil with pulsating voltage when starting;
  • IGN + 12 on red/white wire to igniter and ignition coils from engine stop switch;
  • IGN + 12 on red/white wire to engine stop switch coming from 10Amp ignition fuse;
  • pulsating low voltage from pickup coil between the wires black/white, white/green & yellow/red.
Postback results of above voltage tests.
Good luck and thank you for asking FixYa. Happy Holidays.

Dec 15, 2009 | 1987 Yamaha XS 400 DOHC

1 Answer

I am not getting any spark

You will need a digital multimeter for easy reading ( The one I use cost $5 ). Find the connecter for the two wires for the on/off switch. Disconnect the wires and connect the meter leads to these terminals. Set the meter to Ohms and check that the switch opens and closes connection. Should read OL when open and .01 when closed depending on meter setting. If it checks out, then not the switch. Also check the coil and spark plug boot/wire with Ohm meter. Be sure that the boot is firmly connected to the wire. Small wire to frame- OL. Small wire to spark plug boot- thousands of Ohms (possibly 5000-30000 but don't know the spec). If either of these shows a small number of ohms (example: .01-7 ohms), then there is a short in the coil. Also check that the steel bar of the coil is grounded to the frame/engine with Ohm meter- 0.01. To test the source coil connect ohm meter to small wire coming out and other meter lead to engine ground- should be hundreds of ohms. Sometimes it is easier to start replacing at the least expensive part!

Nov 18, 2009 | 2007 Yamaha Stratoliner

1 Answer

1999 yz 125 weak spark won't start

Not much info Smitty but if that weak spark is constant (ie:pulsing ) i would guess that the trigger coil is ok.I'd make a check on your ignition coil earths then do a couple of continuity tests on your coil primary and secondary , orange terminal to ground,orange terminal to ht lead ,if they check out ok according to service manual specs then i'd run continuity test on the source coil.....Hope this is helpful in someway ...Smittycat.......from Flabbycat

Apr 19, 2009 | 2003 Yamaha YZ 125

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

88 people viewed this question

Ask a Question

Usually answered in minutes!

Top Motorcycles Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4514 Answers


Level 3 Expert

75005 Answers


Level 3 Expert

102366 Answers

Are you a Motorcycle Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides