Quantcast
Jump to content

Yamaha Moto 4 No start need help

Elijah Stone

By Elijah Stone
in Yamaha ATV Forum

 Share

Recommended Posts

Elijah Stone Newbie

Elijah Stone

Posted
Posted

Hi all new to the forum I have a Yamaha Moto 4 champ (100cc?) (YFM100) so I've been trying to get this thing to start for awhile honestly I'm running out of ideas so I'll start with the things Ive replaced and done first it was not trying at all and then I put a brand new battery then the terminals broke so I bought some nice copper ones fixed that up so now battery is got good voltage and all that I have checked all the plugs cleaned everything off so anyway it still wasn't trying but I couldn't get the crank case off and I didn't think using fire was a good idea lol so I busted the crank case off on the left side(if you are sitting on it) wierdly enough the flywheel started spinning I thought it was odd but went with it then I replaced the spark plug still wasn't getting spark so I replaced the ignition coil then it was getting spark next the carburetor was really gross I cleaned it out still wasn't working so I in turn decided just to replace it with a new one so I did (PS I never figured out how the fuel lines hook up if someone wants to help with that to lol) also for good measure put a new air filter so then I pressing the button Everytime I replace something and nothing so then I think what if it's the stator so I have no idea what a good or bad stator looks like but me being to rough I broke the wires on the thing but still no changes the fly wheel spins gets compression (I think) getting spark from spark plug idk other tidbits that might be useful I don't have a clutch line so idk if that has something to do with it I do have the break zip tied in to bypass the safety feature also the throttle cable is in fact broken and I'm working on buying a new petcock for my gas tank because my current one is broke I have very limited money this is supposed to be a project before I go to school for welding and automotive tech so I don't have any money to get a mechanic lol but I'm pretty confident in my ability to do anything u suggest any suggestions are welcome I'll edit and submit pics

Frank Angerano Grand Master

Frank Angerano

Posted
Posted

Welcome to Quadcrazy @Elijah Stone  Thats some write up.

Once you replaced the ignition coil and you had spark the stator should be left alone since the spark is there.

The fuel lines are not difficult to put on, there should only be one fuel line on the left side of the carburetor and the others would be a vent hose that may run up behind the gas tank and another hose would be connected to the bottom of the bowl on the carburetor and do noting but hang down under the frame. It’s called an overflow hose  that allows fuel to spill out of in the event the carburetor had a failure of some sort or the bike is flipped over.  Both hoses would be generally smaller then the fuel hose. 

So what I would do is for now turn the gas off. Pull the spark plug out and test for spark.  Take the spark plug and plug it back into the ignition coil wire and rest the metal part of the spark plug on he engine head. Make sure your kill switch is on and crank the motor. You should see a spark at the plug right at the gap. Make sure it’s plugged in good and touching the metal part of the engine. 

 

If you have spark that’s great, put the spark plug back in and then make sure your fuel lines are properly connected and discussed. If your not sure then post some pics and we will help you along. If you figured it out then turn on the fuel and crank the engine. The bike should fire up just make sure your choke is working properly. 

Unfortunately these things cost money to fix so your going to have to spend a little money if you want to get it back to good.  

Let us know how it goes.  

Good luck  at welding and automotive tech  school. Your going to enjoy it, stay focused and learn as much as you can! 

This will be a fun little project to work on for you as well as learning a lot about the atv world just be careful. 

👍🏻

 

 

 

 

  • 1 month later...
Elijah Stone Newbie

Elijah Stone

Posted
  • Author
Posted

@Frank AngeranoThank you so much for the reply I do in fact have spark I'm not home rn but when I do get home I will post pics of the fuel lines I just replaced my petcock valve on the gas tank because it was corroded and green and had none of the little things that go into the gas tank I forgot to mention though that my headlight and neutral light will not come on the headlight used to work but now it doesn't so I did replace my Glass fuse holder coming off the postive terminal on the battery with a new one stupid me though didn't check the voltage to make sure the fuses where the same so I'm thinking that might be why my neutral and headlight arnt working but my starter does kick on so idk? Anyway when I get home I will post pics of the fuel lines

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.

×
 Share
Go to topic listing

  • Similar Forum Topics

    • rjsummer
      Suzuki LT185 electric start question
      By rjsummer
      Just picked up an 84 LT185 ATV, I understand there was an accessory add  on that gave it electric start, anyone have any info about that kit? 
    • hengstserepair
      2000 Yamaha Breeze 125 slips in Forwards, runs fine in reverse
      By hengstserepair
      Howdy ya'll. I am working ona 2000 Yamaha Breeze 125. It was in rought shape when I received it and I am working through issues as they pop up. The quad had been sitting for years. I was able to get her running again, but I need your help with the following issue:
      I don't trust the transmission yet and I don't want to make problems any worse. So, I haven't pushed things hard at all. Low rpms, less than 5mph in reverse.

      Nuetral: Runs as expected
      Reverse: She seems to be driving fine at slow speeds. Going into reverse at idle is fine, coming out of reverse back into neutral won't work (the shifter is just stuck). As soon as I turn off the quad, I am able to shift around without any issue.
      Forward: It slips. It seems to only transfer power to the wheels on a smooth surface and going slightly downhill. When shifting into forward at idle, there is a clacking sounds during the transition. Shifting back to nuetral works just fine.

      Other Notable Symptoms: There was old oil in the vbelt and when I was tuning the carb, it starting blowing out of the CVT cooling vent at the front of the quad. Made quite a mess. There is positive crankcase pressure due to piston blowby, that I have not decided whether or not I am going to fix (customer budget dependant).  Since the oil was old, much darker than the new oil that is in the crankcase, I am thinking it seeped past a bad seal while it was sitting for years. The oil that was in it when I first got it had gas in it.

      Thoughts: I am thinking maybe there is an issue with the clutch. I worry about the old oil intermingling with the dry centrifugal clutch. I was thinking my next step would be to take the cover off of the clutch and inspect it.

      Let me know what you all think. Any advice and ideas is greatly appreciated. This is only the 3rd quad I have worked on and I have a lot to learn.

      Lorne
    • Rockbottom
      2008 Yamaha Big Bear 400 will not start
      By Rockbottom
      2008 400 big bear was running now will not start
      have power to relay, in neutral, press start have power to starter but nothing happens starter does not turn
      i have good ground at battery to frame and added ground from wire harness to frame beside batter/ frame ground
      blue white wire to cdi has power with key on
      I believe the neutral lock out is working since is was before i shut it down
      if i put  it in gear and hit the start button with key on the relay does not click or send power the starter
      The 3 wires at the relay have power with key on
      What should i test next?
      thanks ahead
    • Mister907
      2000 Yamaha big bear 400 won’t start
      By Mister907
      Hi guys, I have a 2004 big bear 400. Last winter while plowing the driveway, I heard a loud pop from the left side of the engine. It continued to run as I looked for leaky fluid, but then died shortly after backing it up and won’t start now. The oil light comes on when I try to start it, no noise or anything else. 
      No blown fuses that I can find.
    • jeffinotown
      2007 Yamaha Big Bear IRS Short
      By jeffinotown
      Hey guys and gals. I've been working on my friends 2007 big bear IRS. Unfortunately after 3 different people got their hands on it and only made things worse every time.  After months of finding just crazy problems everywhere. I'm finally at the point we're its almost 100% !!! But I'm getting a short somewhere between the 4xW switch I believe. I managed to by searching the internet like a  fiend, got my hands on an official Yamaha wire harness for the year and make. But I don't have the numbered component list and to be honest. After hours of going through and making everything so it's  easy to reference. If anyone has a picture of the referenced components. I would be forever in your debt. I've spent hours marking up the blown up diagram so it will be easy, for any possible future repairs. Please and thank you. Here's a picture of what i have so far.  Unsealed it in plastic so oil and crap won't spill or get smudged. This damn things worth it's weight in gold.              Thanks Jeff                2007 Yamaha big bear 400 IRS.       YFM40FBW

COMMUNITY SECTIONS

ATV FORUMS

QUADCRAZY MEMBERSHIP

Be a part of best online community of ATV riders and join thousands of people who love ATVs! Share your ATV photos, videos, ATV rides, get help with your ATV and more. Not a member?

SIGN UP TODAY

ADVERTISE WITH US

FOLLOW US ON

  • Automotive Webmaster
×
×
  • Create New...