Question about Yamaha V-Max Motorcycles

1 Answer

After removing the coils on my 2002 Yamaha Vmax, I find that all four are cracked, some worse than others. Before I order all four of these, what are the static tests I can do on these to verify if they are within limits or if I need to trash them. thanks

Posted by on

  • water2live4 Aug 11, 2010

    This information was helpful in troubleshooting the coils, but as it turned out the pilot air screw passages were gummed up. Supposedly, carbs had just under gone a complete dismantling and cleaning. Right!
    Thanks so much for all the input.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 10,515 Answers

Hi,

You could test the coil with the help of a meter.If the coil tests good you then need to test the pick up coil coming from the stator cover, all those tests eventually lead back to the cdi box if they test good. You can test either the pick up or ignition coil first, I often just go right to the pick up on the Yamaha's.

Those things have an electronic CDI.

You could have coils that would Arc Weld,,,,
if CDI amp or triggers are not working it doesn't do any good to crank it and look for a spark,,huh?
Pull gas tank off so you can get to the coils.
......................................…
Live Fire Test,,
gives visible confirmation of function

Unplug "hot" wire at coil
---Only 2 wires besides the spark plug cable,,one's Ground,,one's "hot"

Get a wire connected to any verified +12v source,,,
and poke it at Coil's Primary lead(the hot wire)
DO NOT leave it connected any time,,,just contact>release.

It wont spark till you "break" the circuit.

If the coil sparks a plug,,,it's OK

Odds are slim that a coil is bad.

Probably the "box",,Igniter/CDI Unit,,,whatever they call it.

....................................
You can use an ohmmeter to test the coil
--on Rx1 scale,,measure resistance between the 2 primary wires.
***You NEED factory specs to compare,,,but should be between 1 & 2 Ohms on most coils

--on Rx1000,,measure between Primary + and Plug wire.
***You NEED factory specs to compare,,,but should be between
7~8K and 20K??

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Check the pickup coils with Ohmmeter---***You NEED factory specs to compare

Check their output on a millivolt scale---***You NEED factory specs to compare,,,but should fluctuate when cranked

Check primary voltage to Main Coil

Check 12V+ Supply to CDI box

Sometimes Ignition Switches are built with separate contacts for Ignition/Lighting/Cranking.
Yours,,I just dont know??
But the symptoms can be power to Crank,,but none to ignition.

Same for handlebar kill switch----in RUN position it's gotta MAKE contact.
Bad Contacts in there can leave Ignition circuit "off"--disconnected.

.....................
If 1 Coil Fires,,but other one doesn't,,,,swap the power wire at the coil.
--If the Dead Coil then Fires,,,both coils are probably OK

--if the previously firing coil quits when the primary wires are swapped......
Then that side of the CDI Box aren't working

Swap the wires back correctly so ya don't forget to later

Then go swap the connectors from the triggers-to-CDI Box

If it makes no difference to the Coil's Firing---
then BOTH the triggers/pickups are OK.
And one channel in the CDI Box is bad.
Because EITHER pickup works on "Good 1/2" of the Box,,
while NEITHER P/U works through "Bad 1/2" of the box.

If Swapping the Triggers at the CDI Box REVERSES which Coil fires & which don't....
Then the BOX is OK and one trigger/Pick Up coil is bad.
Because----Good P/U will fire through either channel on the box & makes it's corresponding Coil fire it's plugs.
But Bad P/U wont fire either side
.........................
If all 4 plugs are Dead,,Probably The Box.
VERIFY 12v supply voltage 1st before condemning it.

Odds are VERY slim Both Secondary Coils would fail at same time.
And just as slim that BOTH pickup coils would fail together .

~~~~~~~~~~~~~~~~~~~~~~~~~
Safety----
If you use a Jumper Wire to test fire coils directly from Battery.
*Connect wire securely to Battery,,,and use a short,,expendable "contact" in the Coils Connector.

a)Ya DO NOT want to strike any arc at the BAT terminals
b) Your Test Make&Break Contact to trigger the Coil is a Hot Arc and will burn the Coil's Connector----so beat up on a nail or piece of scrap wire stuck in the connector instead of burning the connector itself.

---Do NOT apply any power to Pickup Coils,,,
--Do NOT apply any power to CDI Box's P/U Inputs
``````````````````````````````````````…
I'd start by verifying 12v+ to the CDI Box....if it's there,,you eliminate all the possibilities of wiring harness & switch problems.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~…
Really a simple circuit.

It's like 2 separate Ignition Systems,,but with BOTH their CDI Amps in same box.

(TRIGGER #1 & #2) --->(CDI Box which has #1 & #2 Channel)-----> (Ignition Coils #1 & #2)

Only thing besides those 3 basic component groups is the 12V+ supply to the CDI Box---keep in mind it is Switched at several points ,,,as well as having plug-in connectors on the harness .

Those type things can stop it just as dead as a bad part.

A nice website to look at :-

http://www.dansmc.com/electricaltesting.htm

Good Luck!!

Thanks!!


Posted on Aug 04, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
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.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

My 2003 Yamaha VMAX doesn't get any spark it all four plugs would resetting the system maybe fix that


Hi, Anonymous probably not 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.
6. Faulty ignition coil or ignition / electronic 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 links below. Good luck and have a nice day.
No Spark VMaxForum net
97 yamaha vmax no spark
How to diagnose no spark situation on motorcycle
Max Tech

May 24, 2016 | Yamaha Motorcycles

1 Answer

How to remove rear fender on Yamaha vmax motorcycle


Place on center stand, remove rear wheel, remove passenger seat, unplug turn and tail light wires, you will see 2 nuts or bolts holding grab rail, remove these, there is also one small bolt in the center between the grab rail bolts, remove it, be careful as you remove it as fender will now drop out.

Feb 21, 2015 | Yamaha Motorcycles

1 Answer

Yamaha vmax '03. Coolant keeps pissing out of the


You have an over heat problem. Check the radiator cap for correct operation. have a cooling pressure test done for cracked head / gasket. Do a compression test done for head gasket failure.

Jul 23, 2013 | Cars & Trucks

1 Answer

Rear wheel removal on a 2009 V Max


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.starvmax.com/kunena/13-technical-vmax-discussion/133190-rear-wheel-removal/mode-replies
2009 VMX17 Rear Wheel Axle Bolt Trick
Yamaha Vmax VMX17C 2009 Service Manual
OEM parts for Yamaha
YAMAHA VMX17 Owner Manual

Jan 16, 2013 | 2009 Yamaha VMAX

1 Answer

Remove backrest Yamaha Vmax


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $ you can download another one. 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.
Seat and Sissy bar removal VMaxForum net
HOW TO REMOVE MOTORCYCLE SEAT Cruiser
Yamaha VMX12H Supplementary Service Manual
OEM parts for Yamaha
YAMAHA VMAX VMX12V Owner Manual

Jul 15, 2012 | Yamaha V-Max Motorcycles

2 Answers

Hi 2000 yamaha Vmax, 4600 miles on the clock.


This sounds like a carburetor problem. Either bad gas, partially plugged pilot jets, carb diaphragm cracked or has a pin hole, carbs out of sync or diaphragm cap is not tight. It would be best to have a dealer check it out. However, before going to the dealer I would try one thing. Drain the float bowls on all four carbs. There is a drain plug on the bottom of each bowl. Condensation inside the gas tank can make it's way into the carb. Bikes don't run well with water in the gas. Please rate my solution. Thanks.

49fc734.gif

Aug 12, 2010 | 2000 Yamaha V-Max

1 Answer

Xs750 what is the firing order


There is no firing order. Your bike has a coil that fires on both the compression stroke and the exhaust stroke (also called a wasted spark). Therefore either plug wire can go on either cylinder and the bike should run the same.On four cylinder bikes this meant that you could run four plugs using only two coils and two sets of points instead of four coils and four points.If the bike is running poorly try new spark plugs and new spark plug caps first(start with the cheap stuff). Next check the actual coil and pulse pick up or points. You may have to replace the coil only because the wires are cracked shorting.

Jul 25, 2010 | 1979 Yamaha XS 650 SF

1 Answer

2002 yamaha 1200 vmax 4 bbl carb fouling plugs


Hi, Jamie12r and the usual suspects are:
1. Dirty air filter.
2. Fuel mixture too rich or enrichner/choke left out too long.
3. Faulty spark plug.
4. Incorrect spark plug heat range for the engine type or service.
5. Piston rings badly worn or broken.
6. Valve guides are badly worn and/or seals worn, crushed or have come off the valve guide and are pumping oil through it.
7. Spark plug cable weak or leaking check for spark jump in the dark.
8. Faulty ignition coil.
9. Low RPM nonaggressive riding style.
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.
Vmax fouling sparks plugs
Thread What Will XLT1200 Behave Like Fouled Spark Plugs
Yamaha VMX12H Supplementary Service Manual
OEM parts for Yamaha
Yamaha VMAX VMX12W1 Owner Manual

May 13, 2010 | 2002 Yamaha V-Max

1 Answer

Vmax 2002 full power model only fireing on 3 cylinders checked coil / leads / plugs and all wiring connectors but no spark to cylinder could this be a pick up coil or a faulty cdi unit


Hi, John_mvc 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 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.
Running on 3 cylinders help VMaxForum net
http://www.starvmax.com/kunena/13-technical-vmax-discussion/162629-running-on-3-cylinders-please-help
Yamaha VMX12H Supplementary Service Manual
OEM parts for Yamaha
YAMAHA VMX12 Owner Manual

May 11, 2009 | 2002 Yamaha V-Max

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

418 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

dhnguyen

Level 2 Expert

281 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1144 Answers

Tony

Level 3 Expert

2600 Answers

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

Answer questions

Manuals & User Guides

Loading...