Motorcycle

Motorcycle questions? Ask a mechanic.

Ask an Expert,
Get an Answer ASAP!

I have an 87 yfm 80 yamaha i only owned it a week before…

Customer Question
Hello i have an 87...
Hello i have an 87 yfm 80 yamaha i only owned it a week before it developed a spark problem. First I could charge the battery on the machine and it would run for 10 or 15 minutes with a good spark eventually I will lose this all together. I bought a new battery replaced old one. The problem was fixed I thought it ran good for 2 months then over the winter its at and must all that spark completely so this spring being that I'm not that mechanically inclined I decided to start swapping out parts on it after doing research online I started with changing out the stator which came with both coils attached I bought this brand new but it did not help so I thought I may have had a bad ground and I bought a new wire harness and checked all the grounds and still a very weak were no spark either way very intermittent and weak so then I bought a new ignition coil and still same problem so my question to you is now that I have replaced the stater including both are charging coil and pickup coil changed the wire harness and put a brand new ignition coil on it including new plug and still have a very weak or intermittent spark so weak the machine wont fire if I buy a new CD i is that guaranteed to fix the machine and give me a spark
Submitted: 3 years ago.Category: Motorcycle
Show More
Show Less
Ask Your Own Motorcycle Question
Answered in 1 hour by:
6/23/2015
Motorcycle Mechanic: RSRBOB, Technician replied 3 years ago
RSRBOB
RSRBOB, Technician
Category: Motorcycle
Satisfied Customers: 1,078
Experience: Former Factory Service Rep, Dlr Line Tech, Service Manager, General Manager, Store Owner
Verified
Hi and thank you for your problem.Although it may not have been a complete mis-step to replace all the components you did, it sounds like you have a charging system problem more than an ignition system problem. For the ignition system to function properly, it must have battery voltage going to it, so about 12v. If the electrical system is not recharging the battery, it would give the symptoms you described. It runs good right after charging the battery but starts running worse and worse as the battery dies. In addition to the wiring harness and stator, you also have a rectifier in the charging system. The rectifier changes the AC voltage produced by the stator into DC voltage so the battery can store that electricity. If you have the ability to test the rectifier, we can do that. If you are not familiar with a multi meter, I suggest removing the rectifier and taking it to a motorcycle shop and having them check it for you. Suggested retail on the rectifier is about $90. It is a half wave rectifier so it shouldn't take a dealer more than a few minutes to check it. A rectifier is a series of diodes, which are essentially one way valves for electricity. That means when they are functioning properly, they should flow electricity in one direction (polarity) and NOT flow electricity when the polarity is reversed. However, Yamaha states in their service manual that you check all connections first, then continuity through the charge coil, then amp output at 3,000 RPM (0.7 amps or more) and at 8,000 RPM (3.0 amps or more). Sadly they do not provide ACV tests for the stator or resistance/flow direction for the rectifier. Their directions tell you to check the stator, wiring, battery, fuse and Amp out put and if all that is fine, replace the rectifier. Still, a shop should know what they are looking for and be able to advise you as to whether the rectifier has failed. Considering you have replaced the stator, the only two options are really the connections and rectifier.If you have any more questions, feel free to ask.ThanksRSRBOB
Ask Your Own Motorcycle Question
Customer reply replied 3 years ago

Ok weak spark when first turning over still not strong enough to fire. After a 30 sec of turning over almost no spark. This is after a replacement used cdi brand new stader brand new ignition coil replacement wire harness still weak intermittent spark

Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a motorcycle mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Jeff Policky Your Own Question
Jeff Policky
Jeff Policky
Jeff Policky, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 2,425
2,425 Satisfied Customers
Experience: Yamaha Gold, Suzuki Gold, Honda Bronze, Polaris Bronze, BRP

Jeff Policky is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

Jeff Policky

Jeff Policky

Motorcycle Mechanic

2,425 satisfied customers

Yamaha Gold, Suzuki Gold, Honda Bronze, Polaris Bronze, BRP

Louie

Louie

Technician

1,451 satisfied customers

25+ yrs. experience

TIMOTO

TIMOTO

Motorcycle Mechanic

1,246 satisfied customers

Honda registered technician, silver level award, former Kawasaki/Suzuki tech, 40+ years exp.

Andre Pilon

Andre Pilon

Motorcycle Mechanic

1,032 satisfied customers

Over 25 years experience, ICS, MMI, Owned shop for 12 years, worked tech-support for Harley Davidson

Kenny O.

Kenny O.

Motorcycle, ATV, Mules, Side by Side's Product Specialist. All Brands

619 satisfied customers

Worked for Kawasaki Motors as a Product Support Specialist (Factory Support) for 24 years

asphaltcycles

asphaltcycles

Motorcycle Mechanic

468 satisfied customers

I operate a motorcycle dealership and CCS Ducati Race team.

Glenn Adams II

Glenn Adams II

Motorcycle/ATV Technician

393 satisfied customers

6 years Motorcycle/ATV/Water Craft; 4 years auto; 18 years carpenter

< Previous | Next >

Related Motorcycle Questions
Its about a 1985 yfm 200 moto 4. starts great. idles great.
its about a 1985 yfm 200 moto 4. starts great. idles great. runs great in neutral with no miss when reving. put in gearand when gets under power begins popping,backfiring, and dies. starts instatntly … read more
Louie
Louie
Technician
Associate Degree
1,451 satisfied customers
2002 Y amaha Grizzly 660. Wasn't charging battery so
2002 Y amaha Grizzly 660. Wasn't charging battery so replaced stator assy and now no spark. Replaced new CDI,Regulator,Ig Coil. Still no spark. Tried every available remedy. Ran fine until stator repl… read more
Louie
Louie
Technician
Associate Degree
1,451 satisfied customers
Why does a 1991 Yamaha warrior 350 have no spark? Have
Why does a 1991 Yamaha warrior 350 have no spark? Have replaced the following: Ignition coil, stator, pick up coil, CDI and spark plug.… read more
Louie
Louie
Technician
Associate Degree
1,451 satisfied customers
Know about Yamaha Art's? It's Frankenstein. Not sure pre
Well I got a new stator and rectifier in, CDI is suppose to go from 1994 to 2000. Not sure if it's right. It's a 4BD-10 … read more
Louie
Louie
Technician
Associate Degree
1,451 satisfied customers
I have a kx 110 dirt bike that wont start. I have replaced
I have a kx 110 dirt bike that wont start. I have replaced the stator and pickup coil, the regulator, grounded out the neutral safety switch, and bypassed the kill switch. I get a great spark about ev… read more
Louie
Louie
Technician
Associate Degree
1,451 satisfied customers
I have a 2000 suzuki quadmaster LT-500. it will crank but
i have a 2000 suzuki quadmaster LT-500. it will crank but will not start. it has no spark. i have replaced the CDI box, and coil. I also replaced the pick up coil and stator. But then i took the side … read more
yamsuzpolaris
yamsuzpolaris
manager of motorcycle ATV snowmobile dea
Associate Degree
156 satisfied customers
1986 Yamaha atv yfm 225 moto4 No start condition--- have replaced
1986 Yamaha atv yfm 225 moto4 No start condition--- have replaced cdi module and ign. coil no change Question I donot have battery voltage on orange wire at coil-- when should I have voltage at the co… read more
Wayne S.
Wayne S.
Motorcycle Mechanic
Fully Licensed Motorcycle Mechanic
1,256 satisfied customers
2006 Yamaha 660 RhinoIt will spark when the key is first
2006 Yamaha 660 Rhino It will spark when the key is first turn to ON, but when cranking no spark. I change the CDI and the spark plug coil and the spark plug and the pick up coil and still no spark. I… read more
Louie
Louie
Technician
Associate Degree
1,451 satisfied customers
1989 YAMAHA VIRAGO 750 CHARGING PROBLEM,NEW BATTERY RUNS GOOD,
1989 YAMAHA VIRAGO 750 CHARGING PROBLEM,NEW BATTERY RUNS GOOD, BUT BATTERY GO DEAD AFTER DRIVING. THE WHITE STATER WIRES GET HOT.… read more
Eric
Eric
technician
Vocational, Technical or Trade Scho
1,567 satisfied customers
I have three Mule 500s given to me all KAF300b They all need
I have three Mule 500's given to me all KAF300b They all need to be gone through. I need to know about the ignition system. They have staters with two yellow wires and a coil with plug wire and one bl… read more
jmlloar
jmlloar
Mechanic/ Truck driver
Vocational, Technical or Trade Scho
12 satisfied customers
special: arctic..stater went..high low speed ignition charge coil.
i have a 1999 arctic cat powder special. the stater went out of it. the high low speed ignition charge coil. i had that part of the stater rewound. i sent it to ricky stater he rewound it then sent it… read more
Doug E
Doug E
Vintage M/C restorer
Vocational, Technical or Trade Scho
1 satisfied customers
Spark..new plug and tried coil in different bike and it works..stator
2004 yamaha 250 beartracker has no spark. new plug and tried coil in different bike and it works.is there a common problem how do i test stator. all wiring looks good. thanks… read more
Richard
Richard
Senior Mechanic & Technician
69 satisfied customers
How can I get spark on a yamaha raptor 350 I have replaced
How can I get spark on a yamaha raptor 350? I have replaced the CDI box, coil, and starter and still have no spark.… read more
Brian
Brian
CARS SUCK! CUSTOMS & REP, OWNER
Vocational, Technical or Trade Scho
211 satisfied customers
Motorcycle..a 01 yamaha warrior that has a weak spark the stater..coil
i dont have motorcycle but i do have a 01 yamaha warrior that has a weak spark the stater is 6 months old and has a new coil what does it need… read more
Brian
Brian
CARS SUCK! CUSTOMS & REP, OWNER
Vocational, Technical or Trade Scho
211 satisfied customers
A 1998 YZ250 and it has a 2003 YZ250 motor in it will the CDI
My son bought a 1998 YZ250 and it has a 2003 YZ250 motor in it will the CDI from the 1998 work with the 2003 motor? If not what can he do.… read more
Ski Doctor
Ski Doctor
Owner, operator
Vocational, Technical or Trade Scho
530 satisfied customers
I have a 1997 Yamaha Big Bear SE 4x4- Problem- no spark when
I have a 1997 Yamaha Big Bear SE 4x4- Problem- no spark when using start button, slight but very faint spark when pull starting. No history, son (12) just bought non working. From one of your previous… read more
Jeff Policky
Jeff Policky
Motorcycle Mechanic
Yamaha,Suzuki,Polaris Technical Tra
2,425 satisfied customers
yamaha 200 Blaster 4 Wheeler/Quad and have bought a new electonic coil
I have a Yamaha 200 Blaster 4 Wheeler/Quad and have bought a new electonic coil, however still not getting much spark. What do you suggest?… read more
Glenn Adams II
Glenn Adams II
Motorcycle/ATV Technician
Vocational, Technical or Trade Scho
393 satisfied customers
pickup: blown..new plug, new voltage reg..new battery..solenoid
I'm from melbourne Australia and have the same problem with a KLF 300, carb has been soaked and cleaned in yamaha carb cleaner,also has been wire brushed,blown clean including all jets & passages, new… read more
Doug E
Doug E
Vintage M/C restorer
Vocational, Technical or Trade Scho
1 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x