Quantcast
Jump to content

  • Do you own an ATV? Join our Forum!

    As a member, you can post in our forums, upload your photos and videos, use and contribute to our downloads, create your own member page, add your ATV events, and even start your own ATV club to host your own club forum and gallery.  Registration is fast and you can even login with social network accounts to sync your profiles and content.

KJINTF

1999 TRX300 Starting issue

Recommended Posts

Been slow in starting up, in the recent past it would start up in <1/2 second of the button press with a snap. Now it takes several seconds of cranking to get going. Once going runs as it always did. Replaced the plug no change. Battery is good.

Before I tear it apart and look things over was hoping others might have had the same experience and have a quick fix for me

Thanks in advance for any and all suggestions to get this old machine starting quickly again as it has for 20 years.  

Share this post


Link to post
Share on other sites

Probably needs a valve adjustment would be my guess.   You can check this by taking a simple compression test. I would also check the fuel delivery system. Maybe a little bit of dirt caught up in the needle where the float is. This could cause The gas from getting up into the intake port of the carb.  

You could have gotten some bad or dirty gas.

Hows the gas in the bike fresh ? Is the tank clean and maybe a fuel filter if you clean the carburetor. 

Last thing is make sure there are no leaks on the intake boot where the carburetor is mounted and make sure your vent hose on the gas cap is clear.   

Share this post


Link to post
Share on other sites

Might be a valve adjustment - don't believe its ever been done - Will try a compression and leak down test this afternoon

Always used fresh gas with NO alcohol - only thing is that it's 91 only way to get no alcohol around these parts 

Will also take a close look at the carb

Anyone know what the KV of the spark should be?  I have a Pico Scope with the pressure transducer for so can easily see the compression, spark amplitude, dwell, etc..  

Strange this starting issue happened almost overnight about a week ago - Guess it's time to get my hands dirty 

Share this post


Link to post
Share on other sites

My guess would be a fuel delivery issue that can be solved with a good carburetor cleaning and add a fuel filter as well.   But I’m sure a valve adjustment is long overdue.  

As far as spark goes if you can clearly see a good spark when you pull the plug and test it then you don’t usually need to dig deeper into that.  

Might as well double check your timing as well while your adjusting the valves. 

Share this post


Link to post
Share on other sites

Our 1990 Fourtrax 300 starts instantly in less than a full crank. But our 1985 250 cranked on and on but it would start quicker if we shook the machine. It ended up being a plugged screen in the sediment bowl on the bottom of the fuel shutoff valve. It wasn't getting a good fuel flow to the carburetor. 

  • Like 1

Share this post


Link to post
Share on other sites


Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Similar Topics

    • By VikingTrad3r
      picked up my third timberwolf 250 for my daughters.  these are great light weight little quads.
       
      have a strange one for you.  the quad will NOT start in neutral.  it will start in first. 
      if i lift up on the gear selector just enough to hear the little click (its not loud, sounds like a contact clicking, perhaps the neutral safety switch?) the light will go out, but it won't yet be in first either.  that is how i have shown my daughter to start it and she can.
       
      id like to carry out whatever repair is needed.  i have the pdf of the shop manual but it doesn't really have a flow through diagram.
       
      any help appreciated!  thank you.
      i need to add something.  it feels like i can switch into another gear BELOW neutral.  
      so if i switch to neutral, i can keep pushing the gear selector, and it has another click below the neutral.  the light stays on, and when i pull up into first it kind of feels like it has two positions it moves through to arrive at first.
    • By redneck999
      i am sure some one has switched from the dinky battery to a larger car car battery, so any advice? ive got enough bits and bobs on my atv that i feel i need to step up, i keep a float charger on it but i left it unplugged for about a week and it was dead and it a fairly new battery from advance auto, im probably gonna add a cb radio in the future and i think the only thin that has a constant draw is the clock in the dash and the memory for the stereo
      2012 cf moto x5 500 lwb
    • By billyz57
      New to Quadcrazy, Has any Yamaha owners had similar issue?
      1987 Yamaha YFM 350 Starts on Pull, but just spins on starter, and won't start.
    • By bradleyheathhays
      '96 Cherokee here and right now I'm dealing with a no start after a few weeks of suspicious symptoms. She's been driven a lot less over the past year and about a month ago she began starting a little slow. I've got an oversized battery in there so usually she cranks right up no problem. I started monitoring batt voltage and saw around 12.04 V with engine off and 14.10 V or so running. Right before I get the new battery I head to Advance and they run a battery/alternator test. Kid tells me my batt is bad but alternator is still good.

      So I lay out the $ and install the same size 34N EverStart Maxx 800 cca from Wally's and the slow start persists. Measuring the new battery with engine off yields consistent readings of just under 12.7 V, so for the past few weeks I began charging the batt at 2A which seemed to help. A few days ago I venture out for an errand and the engine doesn't restart to get me back home. I get no clicks or cranking at all with a key turn. Batt measures 12.67 V at the terminals. Dash gauges seem to react with the key on, voltmeter reading ~11.5 V, although I'm not sure how accurate that is. Fuel pump pressurizes.

      Something that happened right after battery change out, which may or may not help in diagnosing the problem, is that my pass side headlight only illuminated half way while the driver side stayed full bright. I have an LMC Truck aftermarket headlight wiring harness giving 55/100w low high beam. It's the kind where you run the lights straight off the battery through additional relays. Had to tinker with the light harness a bit to get the new batt in and may have compromised a connection? Maybe a ground? Either way the pass headlight started showing full bright after only 1 or 2 occurrences and has been right ever since. With my alternator testing good and a new battery I wondered if maybe a loose connection was draining my voltage. I was in the middle of testing batt V connected vs. disconnected over time but this no start happened before I could get it done.

      Last thing to mention is that recently I've been removing both my fuel pump and starter relays for security reasons. The way it's acting now is exactly like when trying to start with both relays removed. Being that the fuel pump is pressurizing should I consider testing the starter relay? Other than that could I have caused some kind of part failure by removing and reinstalling the relays maybe around 5-6 times over the last month?

      All ears
    • By Belmontie
      Hi all, bike does start with the electric start mostly, but the battery was weak and wouldnt start it the other day so went to use the pull start, to say its hard is an understatement first of all you gotta do a little jiggling about til it catches then pulling it takes some effort now i know im not the strongest fella in the world but this is so much harder than it should be. 
      It does start of the pull just to get the engine to initailly turn is so hard any ideas why its happening or how to fix this,
      Thanks
        
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...