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1987 Yamaha Moto4 350 carb removal


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    • By wiwild
      Hello everyone !
      I'm currently rebuilding my carburetor on my Yamaha moto 4 350 1987, first time I rebuild a carb 😅 ! It was leaking fuel from the overflow and inside the intake ....
      When I took off needle (the platic top part was stuck like crazy) I had a spring and inside the kit there is a spring, an O-Ring and a washer. 
      Left is the needle that was in the carburetor and right is the new set (I already tried to mount it but it didn't felt right and I accidentally broke the o-ring)
      Anyway, I saw in some videos and diagram that there is no spring in here. So should I put the spring back ? And where ? On top of the needle or bottom ?

       
      This is an original Mikuni carb :

       
      Thank you ! Also if you have any additionnal tips please feel free to share I want to learn the proper way !
    • By Edgar5656
      Looking for a carb for 87 moto4 200. Just bought the machine and it’s got a Chinese one that’s not working right even after I cleaned it out. Looking for the original mikuni vm22sf. 
    • By Steve Bethany Poston
      I just got an old YFM200DX Moto 4 and upon checking the oil in the rear differential I took out I assume the fill plug and it fished out old nasty oil. I plan on flushing the oil and replacing but was wanting to make sure if you drain bottom plug and just fill up to the check plug. Only thing I can think of someone filled it up by the breather on top? Plan on unhooking the hose and blowing it out tomorrow. I also do not have a service manual yet. Also right now the diff vent hose just goes up under the tank to nothing. Does it plug into back hole in the air box? Thanks 
    • By amharrison24
      i have a 91 moto 4 100. has electric start only. for as long as i could remember we have always pushed start it. after riding for while you shut it off. you are able to hit the start button and it will start right up. anyone know where i should start with fixing this issue? im fixing it up for my niece. thank you in advance.
    • By Diesel Dave
      Hi there, I am a new member and have never used a forum before. I own a 250 moto 4, has smoked since I got it.
      Oil consumption has increased, I removed the crank case breather pipe and have a catch can under frame at front. Smoke has not changed. also after more than 20 hrs use during lock down there is a very small amount of oil come out the breather.
      Compression seems very high, engine turns not too bad if stopped for up to 20 mins but much more than that it is difficult to turn engine past tdc. (poss almost hydrolocked?) if left for a couple of hours or more it then turns over easier. Also if spark plug is removed. I would have expected oil to come out when turning engine with spark plug out. 
      I suspect oil is getting down valve guides? smoke is worst during warm up. The starter motor has not worked since before I owned it and I have modified pull start as the pressure on it was causing problems.  I am about to check valve clearances this morning before I get going.  I do not want to dismantle while lock down is on as I am using it daily.
      Any help would be greatly appreciated, Dave
  • Similar Topics

    • By wiwild
      Hello everyone !
      I'm currently rebuilding my carburetor on my Yamaha moto 4 350 1987, first time I rebuild a carb 😅 ! It was leaking fuel from the overflow and inside the intake ....
      When I took off needle (the platic top part was stuck like crazy) I had a spring and inside the kit there is a spring, an O-Ring and a washer. 
      Left is the needle that was in the carburetor and right is the new set (I already tried to mount it but it didn't felt right and I accidentally broke the o-ring)
      Anyway, I saw in some videos and diagram that there is no spring in here. So should I put the spring back ? And where ? On top of the needle or bottom ?

       
      This is an original Mikuni carb :

       
      Thank you ! Also if you have any additionnal tips please feel free to share I want to learn the proper way !
    • By Ypner1503
      Hello and good morning I have a 1987 250 quad racer big carb and engine built . Other day I was driving it it popped and it died on me so I towed it home cuz I didn't want to prevent any more damages try to start it when I got home she backfired and kicked back hard. Need some help if anybody can help me out thanks
       
    • By BillyBlast01
      My older brother gave me his old 1987 Suzuki LTF 230. It was running back in the summer however it does need some minor work. I have replaced a back rim and put a tube in that tire due to the bead not sealing. New brake shoes for the back needs to be put on and the front brakes don't work. But for some reason it has lost power from the battery. He has a car battery hooked up to it and it cranked over last week but then it stopped and the neutral light was out the headlight stopped working etc. Being disabled and on a fixed income I can't take it to a shop so now I need to troubleshoot. Any suggestions would be great. 
    • By William Edwards
      I need a carb for my 1986 LT230S.  Can't find reasonably priced OEM anywhere.  Does anyone know of an aftermarket carb that will work?
      Manual says OEM is Mikuni VM26SS
      Thanks!
    • By SirMaxwell
      Any luck with manuals?
       
      I need a carb in the owrst way and am have gone down a lot of rabbit holes (over 90 tabs and counting). Factory calls for a Mikuni BST34/1 (I think, but need to check manual). I don't care what or who makes the carb, just need a basic reliable carb. No Racing etc, just puttering. I currently only have the cable with the round slide attached.
      Don't care if its round if I know what other parts to get to  make it all function.
       
      Thanks for help, and listening, gonna go chase more rabbits I guess.
       
      Max
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