Quantcast
Jump to content

  • Do you own an ATV, UTV or SxS? Join our Community Forum!

    QUADCRAZY ATV Community and Forum are FREE to join! We keep our ATV, UTV, and SxS forums clean and user friendly. All first time posters in our forums will have to wait to have their content reviewed and approved. Once your first ten posts are approved, you will no longer need to go through a forum post approval process. To bypass the approval process with immediate access and a NO ADS experience in our ATV, SxS, and UTV forums, consider subsribing to a Premium Membership

1991 YFM 250- Carb Trouble?


Viking

Recommended Posts

Guess I spoke to soon. Bragged on another thread about how well this bike ran. And it DID. But then I noticed gas leaking from the overflow tube on the carb. Bike still ran great though. Anyway figuring the floats were stuck I removed the carb checked the floats and put back together. Then it wouldn't start. Turn over but no go. But it didn't leak. When I finally got to start it ran like crap. So took carb back off, re checked floats and porting as best as I could.

Re-installed carb and now not only does it run like crap but its leaking fuel from over flow tube even worse.

I've ordered a new carb kit for it.

I'm not real well versed in carberation so I'm trying to proceed carefully.

Any tips tricks or general input is welcome.

Thanks, Mike

Link to comment
Share on other sites

the small twist ties for garbage bags stripped work great getting into the smaller passages. if you have an air compressor, that is a big bonus to get everything blown out. you'll be fine with a new carb kit, you'll find where everything goes. look at the specs for you float height when you get ready to install. if you run into any problems, cheriah is THE carb queen of QC !! pm her and she will help you out and talk you thru it. here's a good read in the meantime ... http://www.quadcrazy.com/atvforum/general-atv-discussion/11153-carb-crash-course.html

Link to comment
Share on other sites

Got it all back together with no spare parts :laugh:.

Runs good but not real happy with the idle. Seems like the rpm is up and down. Not constantly but like its about to stall and then doesn't. Or sometimes does.

Big mistake I made was not keeping accurate track of where needles were sitting before taking them out.

I've been playing with the pilot screw to no avail.

I'm thinking the pilot jet, which is located in the float bowl should be tightened all the way. I think I bottomed it out then loosened it a couple of turns.

Also I'm getting white smoke from the exhaust. At least I think its smoke. Could be condensation? Cold and damp here.

Any ideas?

Thanks again for helping out, Mike

Link to comment
Share on other sites

Forgot to update. The plug was fouled. I assume from running with a fouled carb. Cleaned plug and a little more tweaking and it purrs like a kitten again.

Thanks for the help. Always been afraid to play with carbs because of a lack of understanding. I'm far from an expert but I learned alot.

Now I've pulled the carbs apart on my 2 outboards. One is 40 years old and never touched. Gummed up bad. The other had water in the gas a couple years ago and has rust.

Great site.

Mike

Link to comment
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 Forum Topics

    • By jashadams
      Hey all back again with my 1989 moto 4 250.
      After putting a new carb on it it's really sputtery, it has new gas and I'm wondering what to tune on the carb to make it idle better. I've attached a video to describe the issue more. The bike is still work in progress but I think the video gets the point across. Thanks!
      Snapchat-1142015191.mp4
    • By p5200
      Hello folks, my machine wound up with I think water in the tank etc. It runs but speeds up and slows back down randomly. When not running I don't see gas dripping  from the drain nipple on bottom of float bowl and drain screw is closed tight. With normal idle speed I see no leaking. When the idle speed increases quite a bit on it's own, gas appears to start slowly dripping from float bowl drain nipple? I'm wondering if the carb is flooding and the gas is actually coming from higher up and just appears, to be coming out of nipple but, is actually running down the sides of the nipple? I put a kit in the factory Mikuni carb last year after sitting for a while and I think the gas in the jug I used had drawn moisture. I plan to pull the carb tomorrow and clean everything out. I was just curious if anyone else thinks it's probably something in the carb and is, acutally a flooding problem? Thanks Folks! 🙂
    • By Ajmboy
      Starting a new topic for the 2024 Presidential Elections. Please be respectable with open discussion 🙂.
      Wikipedia (See who has entered the race):
      2024 United States presidential election
      2024 Presidential Polls: 
      RealClearPoltics
      FiveThirtyEight
      270toWin Interactive Map

       
      Previous topics (now closed):
      2020 Presidential Election Discussion Thread
      2016 Presidential Election Discussion Thread
       
    • By Gwbarm
      My Yamaha Big Bear shifts through all the gears good, goes into reverse smoothly, but when i go to get out of reverse it takes a lot of effort to get it back to first gear, and even then it does not go very smoothly, have to pull up on the pedal really hard, anyone else ever had this problem. Any ideas would be greatly appreciated.    
    • By Mikey69
      Heres my story. Kinda long. I guess I was a late bloomer when it comes to quads. I had never ridden a quad in my life. Rode Dirt Bikes as a kid growing up. Back in Oct of '06 I found a Mustang on craigslist. Took it for a test drive one morning before work. Fast car. 351 Cleveland. I had planned on meeting the guy again after work. For some strange reason thats still to this day beyond me, I stopped in Hillsboro MotoSports on the way home from work. I had 6 Grand on me. There was a left over '05 sitting by the front door. It was on sale for $4999. It was $5499 OTD. I didnt even look at anything else. I knew nothing about quads accept I thought it really looked coool and I had the money in my pocket to buy it. I was sitting on it when the salesman walked up and asked... "Can I help you?" Without hestitation I pulled 60 Ben Franklins outta my front pocket and said "I want this Quad. Load it up in my truck." It was just about dark by the time I drove away from the shop. BTW, I didnt bother to ask my ol lady if I could buy it. LOL. Anyway, I took it by the house and showed her. She was kinda stunned but not mad. We drove over to a friend of mines house and unloaded it. I took it to the field across the street from his house. HOLY CHIT!!!!! I was surprised by the power. I had it for about 2 weeks and took it to Sand Lake. I was there a few hours and rolled it on a banked turn at the top of the bowl right before you get to the one-ways. When it rolled, I flew off and landed on my belly. The quad came bouncing and landed on my back. For a month I couldnt even walk. I was scared of it. I considered trading it for a 250EX. Went back to the shop. The salesman said..."Dude!!! You dont want a 250EX!!! Trust me. Just get used to it" I still wasnt convinced. I put it on craigslist for $4000. Calls were coming in. I had a guy that wanted to come look at it that evening. I decided to take it for one last ride at Browns Camp before I sold it. I was still afraid of it. After about 5 minutes I started feeling comfortable on it again. I decided right then, I loved my Honda 450 and would learn how to ride it instead of selling it. That was late Nov of '06. Work was slow for a Painter in Oregon. My new job everyday? Going to Browns Camp and ridding my Quad. I bought my Girl Friend an '02 Blaster. I rode my 450 for 4-6 hours almost every single day for 3 months. And yes, I know my way around Browns Camp pretty well. LOL. In March I bought her an '06 TRX250EX (Thank God I didnt trade my 450 for one of those) LOL Since then, I have become totally addicted to quads. I love them. Couldnt imagine not owning at least one quad. Luckily I have two. My "07 was $6500 OTD in July of '07. Bought it for my Girlfriend. Traded in her 250 EX. A month later we broke up. So, I wound up with two Honda 450's.
       
  • Similar Tagged Forum Content

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...