How JustAnswer Works:

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

Ask mrfixitRick Your Own Question

mrfixitRick
mrfixitRick, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 143
Experience:  My first job was Yamaha mechanic in 1972. Working on motorcycles and ATV's since.
8471443
Type Your Motorcycle Question Here...
mrfixitRick is online now
A new question is answered every 9 seconds

1988 hnoda 300 fourtrax will not start.Replaced plug then started.Sat

Customer Question

1988 honda 300 fourtrax will not start.Replaced plug then started.Sat few days now wont start has gas no spark.Changed plug again still no spark.Check all elec connections then started but sits for a few days then wont start.no spark again.
Submitted: 5 years ago.
Category: Motorcycle
Expert:  mrfixitRick replied 5 years ago.
HiCustomerand welcome to JustAnswer.

My name is XXXXX XXXXX I would like to help with the Honda starting problem. I've owned several TRX300's and have a lot of respect for them!

Perhaps the voltage gets too low from sitting and prevents a good spark. It should be above 12.4 volts. Also, check the 10 mm bolt at the ground connection at the battery on these machines, as it tends to loosen off easily.

Do you know what the initial battery voltage is after the machine sits?
Are you getting a bright green neutral light?

Also, if fuel leaks into the engine from a leaky carb float valve and an open fuel petcock, it will tend to foul the plug and be hard to start. So, the plug may not fire because of weak spark and/or fouling.

Are you using the stock spark-plug and normal .035 in gap?







Customer: replied 5 years ago.
I know it is getting gas. Even tried ether.Had battery charger on over night cranks great.Has new battery.Pulled the plug wire put in a plug to check for spark no spark.Checked all elect connections all nice and tight.still no spark.
Expert:  mrfixitRick replied 5 years ago.
Ok, thanks for the details. I assume you know to ground the sparkplug to the block to check for spark because you successfully got spark before. I also assume the engine kill switch is in the "on" position! (we've all done that before...at least I have! ;) Move the kill switch on and off a number of times to make sure it feels free and working ok.

Sometimes the spark-plug wire cap can disconnect from the plug wire. Make sure it is tight by screwing the cap onto the wire clockwise to secure it. Check the coil wire connection to the coil in the same manner.

If these connections are good, and no water in the spark-plug cap, then it would be the easiest next step to replace the coil with a known good one.

If you don't have a test coil to try, the ignition coil can be tested...the secondary resistance should measure 6-10 kohms between the cap and the coil. If out of range, remove the cap from the spark-plug wire and measure the wire to coil again at 2.7 -3.5 kohms.
The ignition coil primary can be tested at .1-1.0 ohms resistance between the wire terminals with the wires disconnected.

If the above tests prove ok, and the wiring connectors seem to check out ok, then the problem could be a short in the kill switch, (bypass the switch wires and try again) or a more serious problem with the Ignition Pulse Generator or the Ignition Control Module (ICM). The tests for these items are more complicated as they require a "peak voltage adapter" for the voltmeter. You may have to resort to parts replacement if you cannot diagnose between these two main units. If you need to know more about this, let me know.

Expert:  mrfixitRick replied 5 years ago.
Here's another test for you... this is for the CDI unit. The 300 Hondas had some issues with the CDI boxes. To check for a problem with the CDI box, pull the spark-plug and ground it to engine like in normal spark test. Crank over engine and check carefully for one single spark just as it starts to crank. Keep cranking for a couple of seconds more, and check for one single spark at the plug when you release the starter button. If this is happening, you need to replace the CDI box, or repair an engine ground connection.



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 P Elm City, NC
< Last | Next >
  • 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 P Elm 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. Phil Marysville, 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. Charles Walnut 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!
    Sue Charleston, 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. Jim Castleberry, 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
 
 
 

Meet The Experts:

 
 
 
  • Harley Tech

    Motorcycle Mechanic

    Satisfied Customers:

    1297
    35+ Years Experience on Harley/Honda Specialising in HD Tuning Super Tuner etc
< Last | Next >
  • http://ww2.justanswer.com/uploads/harleytech/2008-09-21_185638_phpts91u2_c2pm.jpg Harley Tech's Avatar

    Harley Tech

    Motorcycle Mechanic

    Satisfied Customers:

    1297
    35+ Years Experience on Harley/Honda Specialising in HD Tuning Super Tuner etc
  • http://ww2.justanswer.com/uploads/EX/extremeccs/2012-6-10_19914_steve11024x768.64x64.jpg Steve's Avatar

    Steve

    Motorcycle Mechanic

    Satisfied Customers:

    6027
    30+ yrs. experience, MMI, HD technician, HD early, engine rebuild/performance, bike builder, kit bike program manager, CCI 2001-2004
  • http://ww2.justanswer.com/uploads/jpolicky/2009-4-3_43150_200009a.jpeg.jpg Jeff Policky's Avatar

    Jeff Policky

    Motorcycle Mechanic

    Satisfied Customers:

    2381
    Yamaha Gold, Suzuki Gold, Honda Bronze, Polaris Bronze, BRP
  • http://ww2.justanswer.com/uploads/Guest/2008-01-28_125643_phpbZSI1u_c2AM.jpg TIMOTO's Avatar

    TIMOTO

    Motorcycle Mechanic

    Satisfied Customers:

    1101
    Honda registered technician, silver level award, former Kawasaki/Suzuki tech, 40+ years exp.
  • http://ww2.justanswer.com/uploads/LoriExpertsMod/2010-04-15_002245_192503.jpg Andre Pilon's Avatar

    Andre Pilon

    Motorcycle Mechanic

    Satisfied Customers:

    1027
    Over 25 years experience, ICS, MMI, Owned shop for 12 years, worked tech-support for Harley Davidson
  • http://ww2.justanswer.com/uploads/GlennAII/2008-5-26_12926_YUMMY_2.jpg Glenn Adams II's Avatar

    Glenn Adams II

    Motorcycle/ATV Technician

    Satisfied Customers:

    393
    6 years Motorcycle/ATV/Water Craft; 4 years auto; 18 years carpenter
  • http://ww2.justanswer.com/uploads/AS/asphaltcycles/2012-7-31_151258_311842101502880177646218277720n.64x64.jpg asphaltcycles's Avatar

    asphaltcycles

    Motorcycle Mechanic

    Satisfied Customers:

    383
    I operate a motorcycle dealership and CCS Ducati Race team.