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.

moderateatvrider

1993 Suzuki Quadrunner - Idle/Throttle Prob

Recommended Posts

:aargh: hello everyone, got some problems with my bike that i need some help figuring out. when i start the bike itll run fine for 2-3 minutes, then it starts to rev really high(almost at max rpms) and doesnt respond right to throttle(sometimes throttle will bog it out doesnt do anything). The only way it can kind of control it (and it seems to work pretty well) is by plugging the breather hole/vent out of the bowl of the carb. When i plug that hole it stops reving really high(almost instantly) but the throttle now seems to stick(I hit the throttle and itll respond nicely but slowly idles down). Now ive cleaned out the carb around 4 times and blew it all out with an air compressor, so it should be well cleaned by now, it also now has a new diaphram installed as well.

I do know that there is a bad valve(I think its the intake valve) because its got around 155-160 psi when engine is cold but once it warms up its a little under 120psi. Also think there is a electrical issue because the head light only gets bright on the last stroke as the bike dies out(No battery installed). Not sure if either of these problems could cause this but hoping someones been there done that and knows the root of the throttle problem.

Also every time i check the spark plug its black and fluffy

Thanks in advance for ur help.:wink:

Share this post


Link to post
Share on other sites


if the plug is black, then its burning rich. i dont think the other problems are affecting the rev issue. is there fuel running out the bowl overflow where you plug it to settle it down? the throttle cable moves nice and the slide works well and isnt sticking? how are the vacuum lines on the carb? is the needle and seat working properly and is the float whole and not taking on fuel? how is the spark plug? proper heat range? hopefully a suzuki guy will jump in to give some suggestions too ...

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 Dan Tressler
      I have a 2018 Sportsman 570 SP Hunters Edition. I bought the quad new in August of 2018 and put around 20 miles on it with no issues. In early January of this year the quad was acting as if it had a bad battery even though it had been plugged into a tender. I checked the battery and it tested well so I took it to the dealership for warranty service. They had it for almost a month. They determined the quad had a bad EPS unit and swapped it out. Then they told me that the wire for the EPS needed to be updated as they could not program the new unit with the old wire. After the wire came in dealership told me they were still having troubles programming. After another week and a half they told me that they had consulted several times with engineers from Polaris and found a workaround and that the quad was ready for pickup. I contacted Polaris to inquire about the warranty being extended as it was in the shop for a month. They extended the 6 month factory warranty for an additional 3 months. I picked the quad up and the dealership said that the 2018 SP editions were known to have issue a with the EPS units but believed that they had fixed mine. I had it back for around a month and took it out a couple times for short rides and everything seemed fine. I parked it again for a few days and when I went to start it same issues (acting like the battery is no good and won’t start, when I jump start no power steering). Took it back to dealership and waiting to hear what the diagnosis is this time as well as their plan to fix this permanently. Just wondering if anyone else has had issues similar to mine or can give me some advice. Thanks in advance!
    • By Steven Urban
      First time using this forum.  Owned a Kawasaki dirt bike once, had no issues.  But I picked up this 4 wheeler at an auction.  They stated it ran, but only needed a battery.  Well I do not believe that was all true.

      Some pictures are attached.  Not sure why, but the whole air filter stuff was removed.  They had some small thing inserted as a make shift air filter.

      I purchased a battery to try this all out.  Waiting to return it and get the proper size, as it was too big for the battery box.  But here is my issue I had while the battery was connected.

      1 - The lights on the steering column did not come on.  Not sure if they work or not.

      2 - The starter solenoid seems to be bad.  I have a new one on order. 

      3 - In the pick, there is another rusted part.  Not sure what that part is or what it is used for.

      4 - What is the 12v rectifier?  square bodied part.

      So when I hooked the battery up.  Pushing the start button did nothing.  Pulling the cord to try and pull start, it turned, but would never fire.  I have put in a new spark plug as well, it looked worn out.  With electric start, I crossed over the posts on the start solenoid, it turned over, but would never fire and start.

      I have read a few other threads and it stated something about needed the neutral light on.  SOmething about a kill switch.

      Any help would be appreciated.



    • By JacobSlabach
      i know this isnt an atv but same type of thing.  I have a riding mower im fixing and selling for my aunt and it has a dead battery.  i jumped it off my atv and when i turn the key nothing at all happens.  i tried jumping the relay still nothing.  this is with the seat down.  you wouldnt think this mower would have issues as its a top-of-the-line brand and almost brand new (aunt found it for a good price, still got tits on tires, just sat for a couple months in a mechanic shop
    • By Twilight228
      Good Morning All!,
      After a significant amount of reading and tinkering, I'm stumped.  We have a pair of Arctic Cat DVX 90s (4-stroke), and one of them runs very rich at wide open throttle.  I've cleaned the carb (which was installed new  last year), verified the main jet (80) to be per the original spec, installed a new air filter, tried a hotter spark plug (CR6HSA), and adjusted the valves (tightened a modest 0.0005" but improved starting).  The hotter spark plug may have help just a bit, but not appreciably.
      Just for fun, I swapped the CDI between machines, and that didn't help either.
      Fouling plugs very quickly, but not to the point the machine will not run or start.  [black instantly]
      Logically, I assume I'm revving out, but the other machine doesn't "stumble/blubber" anything like this one.
      Should I try a smaller main jet?
      Any ideas you guys may have would be much appreciated.
      Thanks in advance everyone.
  • Similar Tagged Content

    • By Jers
      I need to know what I have and what tire really go on it, Mine has 24x11x10 on the back and 22x8x10 on the front and I need new tire but I don't think are the right size. Also I can't find the model number listed but it looks like a 250 quadrunner 2wd and I think it is a 1987 maybe, can anyone help me, also I it has a rich running sound and I put a carb diap in it and cleaned the carb. is there a jet needing replaced?
    • By kingjosk12
      A week ago I could not even get close to starting it. But now I adjusted the valves (exhaust valve was not closed). i got it running but would not run without choke. i adjusted the float because it was to low tried starting it up again and it would not even start. So i went back and looked at the valves and the valve was now open again so i adjusted it and it started right up and ran perfect without choke. So i put it all back together thinking it was ready to go. Started it up and let it run for a little bit. i turned it off and tried starting it again there was NOTHING. took it apart and there was 0 compression and the exhaust valve was open again. I am completely lost need help PLEASE!!!:aargh:
    • By ut1w7b
      I have a 94 sportsman 400. It sat for several years before i got it. I have cleaned the carb it will start and run for about 5 min then it will flood. I have torn it down and cant see anything wrong. has anyone else ran into this problem any hel would be great.
    • By dblbassdrumer
      [ame]
      [/ame] only when u pull back in the clutch does it make this noise and wanna take off
    • By Percherongal
      Turn on key, put it in Neutral, lights on steering column light up. NO head lights and the electric start switch will not work. Let is sit for a few hours, started right up. Sat over night and same issue. Checked fuses and they were good. Battery is giving 12 volts. Opened up the ignition assembly and it isnt getting any power it comes up as a .01 on the volt meter. Pulled the spark plug to check for spark and NO spark. Will not pull start either. Unhooked the battery checked the spark while trying to pull start it and got a weak spark.
      Pushed it into the garage and it sat for 2 days. Turned the key and pushed the start button and it cranked but the spark plug wire was off so plugged the spark plug back in and pushed the start button and nothing. If you jump the solenoid it will crank over but not start. Soo confused , anyone have any ideas?
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...