86 Yamaha 150 VPro

[quat]

lost 3 cyl's on engine. just had crbs cleaned and boat was running fine. checked all wiring connections,battery new, spark plugs new. need info on checking CDI unit & Control module. Boat starts and idles but only running on #2,4 & 6 cyls. checked with timing light. any info will be greatly appreciated

 

[rodbolt]

Re: 86 Yamaha 150 VPro

hello<br /> check the low and high speed speed charge coils. it can be tested with an ohmeter.a better check is with a peak reading multimeter. a bad charge coil will cause the loss of one bank. also test for a charge coil wire short to ground. this will also shut down 1 bank.

 

[quat]

Re: 86 Yamaha 150 VPro

thanks for the reply rodbolt. checked low & high speed charge coils:BRN/RD=1.49K <br />BLK/RD & BLUE = 24.2OHMNS<br />tested with a Fluke 111 True RMS Multimeter<br />tested all leads to ground (Clean)<br />i do have an electronic backround but not when it comes to marine electronics. any help will be appreciated. i also have manuals but they tell me i need special test equipment

 

[rodbolt]

Re: 86 Yamaha 150 VPro

trons is trons baby<br /> I dont care if its TWT tubes, power supplies , radars or sonars. trons is trons here and there trons is trons everywhere. now that we have established the tron theory. all the charge coils are is a winding held on a movable plate. the flywheel magnets rotate around the coils. with me so far? we now have a basic altenator. now it gets a bit complicated. we are going to send the ac signal to a Capacitor Discharge unit hereinafter known as the CDI.in the CDI it will be rectified and stored in a capacitor. when the inner flywheel magnents rotate past the trigger coils it produces another smaller ac signal. we are going to send it to the CDI as well. when the trigger signal is recievied the basic system operation has the trigger signal fire an SCR. an SCR is a silicone controlled rectifier. it is a voltage controlled current controlling device. once fired it will remain fired until the lack of current flowing through it turns it off. the current from the SCR will now flow through the coil primaries.so back to the loss of spark<br /> the only way to find it is with a cd-77 or other peak reading muli-meter. you must test inputs and outputs from the CDI.test all 6 trigger inputs they can be kinda tested with a resistance test. the pulser, or trigger coils fire the cylinders in pairs. I dont have the service manual so I cant remember all the specs on the proV. does your motor have a black box on the back called a micro-proccesor?<br /> and does it have 6 white/striped pulsar coil leads?why I ask is occasionally I see newer powerheads on older frames.<br />so dont get worked up about marine stuff its just another set of trons

 

[Ray Neudecker]

Re: 86 Yamaha 150 VPro

That model has the CDI box on the side. Disconnect the white lead from the control box mounted below the Cdi going to the CDI. This will eliminate it as a cause. Those electronics were as close to bulletproof as ever made. I have seen those control boxes fail and cause some weird problems though.

 

[quat]

Re: 86 Yamaha 150 VPro

Tried disconnecting white wire from control box to CDI Unit still no fix. Checked resistance on control unit, readings not to specs (Clymer Manual)Suspect Control Unit???? Checked Trigger Coil Test all within 20% of specs. (Clymer Manual)

 

[Ray Neudecker]

Re: 86 Yamaha 150 VPro

The white wire from the control unit is the one which affects the fire. You can disconnect the entire unit to be sure, but you have pretty well eliminated it as the cause. The trigger would affect two cylinders at one time, so this leads us back to the charge coil or the CDI.CDI failure is so seldom, I would have to recheck all connections especially the grounds and the charge coil.

 

[quat]

Re: 86 Yamaha 150 VPro

Tested All Grounds I Could Find All Checked OK. <br />The Charge Coils were Tested And Results Came Up Positive (Results Above)

 

[bigbrownbuku]

Re: 86 Yamaha 150 VPro

check your peak voltages, not sure if the meter you describe will measure correctly i have an analog peak meter which is perfect. i know otc are making a meter atm that will also do a decent job and its digital. unusual to drop all oneside however.

 

[quat]

Re: 86 Yamaha 150 VPro

Checked CDI Unit Per Clymer Resistance Spec and Unit Did'nt Test Properly. Noticed That The Control Unit is Marked (ICU) Does That Mean Ignition Control Unit. How does it control the Ignition.(Just a Question So I can Unerstand Its Function)

 

[quat]

Re: 86 Yamaha 150 VPro

Checked Control Unit Per Clymer Resistance Spec and Unit Did'nt Test Properly. Noticed That The Control Unit is Marked (ICU) Does That Mean Ignition Control Unit. How does it control the Ignition.(Just a Question So I can Unerstand Its Function)

 

[Ray Neudecker]

Re: 86 Yamaha 150 VPro

Basically it is the rpm limiter. It interupts the firing by grounding the ignition momentarily. Disconnecting it only affects its ability to interupt the fire. Since we use the old style ignition such as this on the race motors, we simply take it off and discard it. Disconnecting the white wire to the CDI does disable it, but we are also trying to reduce weight at every opportunity and it is a few more ounces of weight gone when removed. Unfortunately for you, we haven't run into the exact failure you are describing and don't have an easy answer to the cause. Having a pile of these electronics available also makes you lazy. If I did run into it I would have swap out parts available to easier troubleshoot. Quite often the specs for testing electronics leaves something to be desired in the original factory manuals, much less than the Clymer versions. Corrosion in the wiring harness (or other connection problems) has now become one of the main electrical problems that crop up now in these 15-20 year old motors.

 

[quat]

Re: 86 Yamaha 150 VPro

QUESTION ABOUT STATOR: THERE ARE THREE PULSOR COILS ON STATOR. CHECKED RESISTANCE ON ALL THREE ALL OK. ARE EACH ONE FOR 2 CYL'S. IF SO WHY AM I MISSING SPARK TO THREE CYL'S. TWO CHARGE COIL'S CHECKED OK. LIGHTING COIL CHECKED OK. NO GROUNDS ON ANY COILS. THIS BRINGS US BACK TO CDI ????

 

[rodbolt]

Re: 86 Yamaha 150 VPro

hello<br /> buddy, now all I can say is test the inputs and outputs of the CDI. to do this WILL require a Cd-77 or equvalent meter. no other way around it.test the charge coil and trigger voltages in and the coil primary voltages out. your down to this is the only way to tell what is wrong.

 

[quat]

Re: 86 Yamaha 150 VPro

OK. Just Received my DVA Meter. Need To Know What Readings I Need To Get From Charge Coils, Trigger Coils & Coil Primary Outputs.Manual only has resistance values.

 

[quat]

Re: 86 Yamaha 150 VPro

NEED INFO ON TESTING CHARGE COIL . DO I TEST ACROSS BRN & RED AND BLK/RD & BLU OR DO I CHECK BETWEEN INDIVISUAL WIRES TO GROUND

 

[quat]

Re: 86 Yamaha 150 VPro

Please help. Cant See Spending $300.00 For Stator . Then $300.00 For Pulsor Coils If That Don't Work . Any Info Will Be Greatly Appreciated

 

[Ray Neudecker]

Re: 86 Yamaha 150 VPro

Email me at neudecray@hotmail.com for phone number to call for more help.

 

[quat]

Re: 86 Yamaha 150 VPro

WANT EVERYONE TO KNOW THAT PROBLEM HAS BEEN CORRECTED: CDI UNIT WAS AT FAULT. WANT TO THANK RAY AND ALL OTHERS FOR ALL THIER HELP AND LET EVERYONE KNOW THAT RAY IS VERY KNOWLEDGEABLE AND WILL GO OUT HIS WAY TO PROVIDE HELP WHEN NEEDED. THANKS AGAIN RAY

 

[Ray Neudecker]

Re: 86 Yamaha 150 VPro

Thanks for the kind words. Now its time for you to go get some fish.