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Found 14 results

  1. so i have a 1990 yz80 and it wont kick start when it is cold so i have to bump start it but when it is warm it kick starts first or second kick. It will bump start the first push but no kick starting. CAN YOU HELP ME!
  2. So I have a 1998 Yamaha Yz80, and I need a new top end. I found a 2002-2017 Yz85 piston kit, for a very reasonable price, and I was wondering if it would be able to fit my 98 Yz80? Would the piston, wrist pin, bearings, rings, Etc be able to fit? And will it work?
  3. Please help! I recently bought a Yz250f and have not been able to start it, it Has spark, but there are many issues with the carby which I wanna rule out before I leap into a rebuild, ( I want to avoid a rebuild if possible as I’m low on cash). The carby at the moment is a complete mess so the usual steps to fixing it might not work. So here’s the deal with the carb: - It’s leaking fuel from overflow ( really fast! ) and when I mean really fast, I mean it emptied my fuel tank in 2 mins. - It has a slow leak coming from somewhere under the float bowl - the air fuel screw is not adjusted correctly - I don’t know if the electrics work on it either - I don’t even know if it’s shooting fuel into the cylinder or not, as after kicking it a couple times and it’s not starting I remove the spark plug and it’s still dry. ( I tried putting fuel directly into cylinder from the spark plug hole but the bike still wouldn’t start) okay so I know it’s a lot but I’m not expecting anyone to answer every single question themselves. If each person could tackle whatever problem they know it would help heaps. Also just want to know what Order to fix things in as I can’t do air fuel until the bike is running and it won’t run unless I stop the leaking and get it to spray fuel into the cylinder. And buying a new carby is not an option ( I’ve got $40 to my name atm). Please help guys thanks.
  4. So, I have a 1998 Yamaha yz80, and it's had a lot of hours on the top end, so it's time for a rebuild. I have a neighbor who is going to help me with it, so i havent taken it apart yet. I'm trying to figure if my bike needs a whole new piston kit, or a gasket kit, or does it need new reeds? So its lost compression. Way less then what it used to be before. The bike is really hard to start, and it fouls my plugs like none other. It doesen't have too much of a power loss, although, the powerband has become weaker. I just want my bike to be running like how it used to be, and I don't want to spend a lot of money on it. It will start sometimes, but most of the time, it will only bumpstart. I appreciate you viewing this, now, so let me know of what I need.
  5. I have an '87 yz80 that has been sitting for over a year. Recently pulled the carb and cleaned it and brought her back to life, but now I noticed that there might be what sounds like a knock. Also, lots of smoke coming from the tailpipe, probably more smoke than what would probably be considered normal. I uploaded a video so you can see what I'm talking about. https://www.youtube.com/watch?v=dPO0GKyKLJc It's smoking way too much and I'm thinking it's gotta be the top end or something. Smells like burnt oil and towards the end you can see the oil oozing in the tailpipe. I can't tell for sure so I need a second opinion.
  6. I am looking for a complete engine for my 1987 yz80 and would like to put a yz80 back into it. What years will mount up without modifications? Where can i find one? I would love to get it running for my little brother so anything helps! Thanks
  7. so i have a 1990 yz80 and it wont kick start when it is cold so i have to bump start it but when it is warm it kick starts first or second kick. It will bump start the first push but no kick starting. CAN YOU HELP ME!
  8. Ok, so ive got a 98 yz80, it runs amazing. Ill fire it up and it starts first kick. Idles great. Ill ride it, and its pretty good in the low end. But sometimes, if i open the throttle it will bog, it slows me down, could it be a rich bog, or a air bog? then ill just hold clutch in, rev it back up and itll be fine. Its not too big of an issue, but it sure is annoying. Im running 50:1, do i need to be running more oil, or could it do with something else?
  9. So I just did a rebuild on my 98 Yz80, and it wont start. At first, we put the gaskets on wrong, so coolant was leaking everywhere. After we fixed that, and put everything back into place again, piston went up and down smoothly, and it has great compression. The problem is, it does not want to start. Im not really sure what to do, because before, my compression was very low, so I did a rebuild, but now it still does not start. So I need help.
  10. I bought a YZ250F yesterday and the previous owner said apparently it runs but they weren’t strong enough to kick it. I couldn’t kick while there so I took their word for it and bought it. I’ve been trying to get it to fire all day today, there are 2 chokes and I’m unsure if the air mixture is correct, so would be nice to know what I should do, it’s hard to adjust the air screw when the bike won’t even run. I noticed the spark is kinda low, I don’t know if it’s normally supposed to be like that or not. I can see a blue spark but it is very small and crappy, I’ve had thumpstars that generated stronger spark, I changed the plug it’s still the same, so maybe could be an electrical problem, the only ground connection I could find was for the ignition lead which I filed down to bare metal so I’m pretty sure that connection is good. Anything else I’m missing? It’s very hard to kick and I can feel the compression out of the exhaust so I don’t think compression is the issue.Just wanna know what I should do, haven’t owned a yz before so I could be not using the choke right or something. Thanks
  11. I noticed a persistent knocking sound thats gotten louder over the past couple months on my YZ80. I have a video here so you can hear it: https://www.youtube.com/watch?v=i2R8Hfj1Klw I replaced the ring back in march, that was the last time I tore down the top end. While it was a part I checked the rod for play and there wasn't anything I noticed that was out of spec. Is this a warrant to tear down the bottom end?
  12. I just ordered a piston kit for my 1998 yz80, and it does not fit into my cylinder. I can't really remember if its a 47.5 mm or 47, i'm pretty sure it's a 47.5 but it just does not fit into my cylinder. My cylinder does have a big groove in it, so do I need a new cylinder for it to fit, or a new piston? Please respond ASAP!
  13. Hello, Fellow 2 Stroke Enthusiasts, I have a 1974 Yamaha Gtmx 80cc that I have been working on. So far I have installed new piston and replaced crank seals on both sides in order to fix idle and smoke issues. I bought all new gaskets for the bike and tried to be meticulous about labeling and making sure everything goes back the same way it came off. I got the bike all patched up and was amazed it started right up with a new spark plug. However, the bike doesn't move an inch when putting into any gear. I am curious if anyone knows whether there is a specific formation the clutch plates should go on, whether I may have tightened something too much or any other thing I may have forgotten to do that lead me to this mishap. Very eager to hear what my 2 stroke audience has to say or their personal experience. Cheers, Nelson
  14. hi, i got some yz 80 2001 suspensions for about $ 60 for my ttr 125. i need to do fork maintenance. Can someone explain the difference between these suspensions with a newer model? These suspensions do not have regulation, only a screw to remove air. I once serviced my 2016 yz 125 suspensions, how different are the 2001 yz 80 suspensions? Any contribution would be very helpful 🙏🏼🙏🏼
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