One of my favorite childhood memories was working on dirt bikes. In the last year I have gotten a kx60,yz80,yz85,and a bombardier ds650x. The best part is the kx60 is the only bike I paid for. I have rebuilt all 4 motors so far and all I'm missing is the 85 and 60 cylinders that are off getting replated. My kids can't wait til their done.
Right on man! I love free bikes! I forget if I said it in the video or not, but I got this one for free because it was about to go to the dump. It's really a shame how much that happens. The world needs more people like us to save clapped-out bikes 😂!
My cousin and I owned a 1980 Yamaha YZ-80 in the classic yellow and black 'bumblebee" color from new until around 1989 when we foolishly sold it. That was my favorite bike out of all my bikes, scooters and a ATV. It was very fast for a 80cc 2-stroke and would easily keep up with and often beat larger displacement 100cc and 125cc 4-stroke enduros. To this day I still feel that a dirt bike should be 2-stroke and a street bike should be a 4-stroke. The power band and the way you use the low to mid range power offroad and on dirt is better suited with a 2-stroke. I wish I still had my old bike today as the vintage ones like mine are worth some money and people collect them. Back then it was a $200 - $250 bike used.
Great work man ! I love restoring and working on bikes! It’s a passion. I’m working on retro fitting a yz85 engine into a kx65 ! I think the yz80 rad would be perfect for my build but I don’t know the dimensions. Could you measure the radiator on your bike for me ? I would really appreciate it !! Great Job on the build man it looks great !!
i just picked up a 2000 yz80 for my little brother and it's in similar condition as yours was when you first bought it and the kid before me just replaced the top end and there's no compression like you said yours had how much did it cost to for the parts to fix it
That’s awesome that you bought your brother a bike! Sounds like the kid before didn’t rebuild it right. My total cost was a little over 1000 but I spent some extra money for things that I wanted rather than really needed. Like the after market exhaust, folding levers, and brand new plastics (could’ve bought some used ones). eBay I great for finding new and used parts for these bikes for decent prices. Let me know if I can help in any way as you fix it up. Email would work best though because sometimes I don’t get notifications from comments.
Go for it! It’s a great little ripper. It’s a similar size to a crf150. It would pop wheelies when I I had it. If you have some riding skill already, you could also look at getting a 125
Good work. I bought a Yamaha yz 80 and my engine spark plugs are still being destroyed. How do you set up the carburetor? Every time I drive at maximum speed, it slows down slightly. I don't know how to set the needle in the carburetor. Thx😀
Thanks! It sounds like you are running way too rich, sometimes this can be solved simply by setting your mixture screw to your temperature and elevation. I believe mine is either 1 1/4 or 1 1/2 turns out at sea level. If that doesn't fix it, make sure that your jets are both the right size for the mods that you have done (you can find charts online if you have an exhaust system). The charts usually have a needle spec too. This site should help: www.procircuit.com/jettingspecs4.htm
Hey PDB great answer. It’s not a problem I’m having or anything but good to know if I ever run into this & it’s not exactly a jetting issue; especially pointing out the Procircuit site. Thanks for that. Good work on the YZ- that’s nice! I love this stuff. Hope to see more. Damn good to know nice plastics can still be had on ebay lol.
Hey I know it’s been 3 years since you posted this video so I’m not likely to get an answer but I figured I’d try and ask anyway, I got a ‘99 YZ80 from a friend, had several owners and a few problems here and there. One thing that concerns me though, is there’s a lot oil and possible unburnt fuel coming through the exhaust, I’m wondering what oil to fuel ratio you’re running and if you have any suggestions because I’m at a bit of a loss right now. The top end was replaced a little over a year ago and I’m getting a new spark plug for it tomorrow, it seemingly rides fine but won’t stay idling for long and seems a bit underpowered. And it starts running a lot better when it’s almost out of fuel for some reason
Hey man, I sold my 80 a while back, but I always ran 32/1 in it. It kinda sounds like you are running rich. I’d recommend going though and rejetting your carb. If you have an aftermarket expansion chamber, FMF has a good jetting chart somewhere on their website that I always reference when jetting a carb. Just search up yz80 fmf jetting chart. It should say the stock specs then the specs with a pipe. I’d also get an oil that suits your riding style. I mostly ride slow trails and back roads with my yz250, so I use a lighter synthetic oil that burns cleaner at low rpm. It doesn’t have any unburnt oil coming out of the pipe. There are oil types for all kinds of riding, so I’d recommend looking into that for your riding style. You could also have a blown right side crank seal and it is getting extra oil from the transmission. To test it real quick, pull the oil fill cap and put a small piece of paper over the hole. Then kick it over and if air is coming out of the oil fill hole, the crank seal is bad. It would be easier to do this test with it running if you can get it to stay running for a bit. Im not sure if I said it in my video, but I had to replace the right crank seal on mine and that is how I diagnosed it. Also make sure your air filter is clean. Even though it’s probably not the main cause of your issues, a dirty filter will reduce power and cause a rich condition from the reduced air flow. Hopefully this helps a little. Keep me posted on how it’s going and feel free to ask any more questions about it! Good luck👍
@@projectdirtbikes Thank you so much, I recently got it idling sort of steady and it seems like oil has stopped coming out. I'm still a little cautious with it but I think it's mostly ok. There was an air leak above the reed valves that I fixed with some gasket maker. That should be most of the issue, but my gear oil got milky somehow. I think there might be still some seal issue between the cooling system and the transmission, so i'll keep an eye on it for now and do some test runs in the meantime. Again, thanks for the advice
Nice bike bro i just got one aswell but im actually having trouble with mine so my clutch cable wasn’t working anymore and i bought a new one but now im seeing that my actuator is not working either do u know why is that happening?
@@Leroy.g10 sounds like something is wrong with your pressure plate. Or something that directly affects it. When you pull the clutch lever, does the pressure plate move?
WD40 and scotch brite, then aluminum polish with a microfiber towel. I have a video on my channel going over the procedure. czcams.com/video/ZgvkyGffkSY/video.html
Hey sorry I just now saw your comment. CZcams does that sometimes. I got it for free since it was on its way to the dump. But I ended up selling it for $1700. Let me know if I can help with anything!
Hi, thanks for watching! Yes, I would say that would be worth it as long as the wear parts are also good. Like brakes, bearings, fork seals, tires, and chain n' sprockets. If one or more of those parts are worn, I would try to get the price down. The more you know about the seller's bike, the more you can use it against them.
Fact about "power" in 1998 AMA allowed 450cc 4-strokes to compete against 250cc 2-strokes as they proved to be reasonably fair and equally matched. Something doesn't add up in the math there and it is clear a 2-stroke motocross dirt bike is a lot faster and more powerful. That little YZ-80 you have there would give much larger displacement 4-stroke bikes serious problems. You can tell when you squeeze the juice on.........
One of my favorite childhood memories was working on dirt bikes. In the last year I have gotten a kx60,yz80,yz85,and a bombardier ds650x. The best part is the kx60 is the only bike I paid for. I have rebuilt all 4 motors so far and all I'm missing is the 85 and 60 cylinders that are off getting replated. My kids can't wait til their done.
Right on man! I love free bikes! I forget if I said it in the video or not, but I got this one for free because it was about to go to the dump. It's really a shame how much that happens. The world needs more people like us to save clapped-out bikes 😂!
My cousin and I owned a 1980 Yamaha YZ-80 in the classic yellow and black 'bumblebee" color from new until around 1989 when we foolishly sold it. That was my favorite bike out of all my bikes, scooters and a ATV. It was very fast for a 80cc 2-stroke and would easily keep up with and often beat larger displacement 100cc and 125cc 4-stroke enduros. To this day I still feel that a dirt bike should be 2-stroke and a street bike should be a 4-stroke. The power band and the way you use the low to mid range power offroad and on dirt is better suited with a 2-stroke. I wish I still had my old bike today as the vintage ones like mine are worth some money and people collect them. Back then it was a $200 - $250 bike used.
Good looking bike,I just picked up 95 yz80 it's going to need some love about the way yours looked at beginning I hope I can bring her back to life
Awesome! Good luck with the build!
Rad bike builds bro keep it up
Thanks man! I appreciate that
Good work dude
Thanks!
Great work man ! I love restoring and working on bikes! It’s a passion. I’m working on retro fitting a yz85 engine into a kx65 ! I think the yz80 rad would be perfect for my build but I don’t know the dimensions. Could you measure the radiator on your bike for me ? I would really appreciate it !! Great Job on the build man it looks great !!
Thanks man! Sounds like a fun project! The dimensions are:
14in tall. 5in across. 2in thick.
Keep me posted!
Nice 👍🏻
👍 Nice work
Thanks!
🤘🤘🤘
My very first mx bike
It was a blast to ride! Kinda sad I sold it but I was way too big for it😂
i just picked up a 2000 yz80 for my little brother and it's in similar condition as yours was when you first bought it and the kid before me just replaced the top end and there's no compression like you said yours had how much did it cost to for the parts to fix it
That’s awesome that you bought your brother a bike! Sounds like the kid before didn’t rebuild it right. My total cost was a little over 1000 but I spent some extra money for things that I wanted rather than really needed. Like the after market exhaust, folding levers, and brand new plastics (could’ve bought some used ones). eBay I great for finding new and used parts for these bikes for decent prices. Let me know if I can help in any way as you fix it up. Email would work best though because sometimes I don’t get notifications from comments.
Around how much did you put in total in the bike money wise ?
I just bought it
Nice! Did you upgrade to rear wheel big wheel 16 inches? Any modifications?
Thanks! I went with the stock wheel size.
Thinking about getting a 1999 yz80 I’m 14 and I’m pretty tall do you think that I could pull wheelies on it or should I look for something else
Go for it! It’s a great little ripper. It’s a similar size to a crf150. It would pop wheelies when I I had it. If you have some riding skill already, you could also look at getting a 125
Good work. I bought a Yamaha yz 80 and my engine spark plugs are still being destroyed. How do you set up the carburetor? Every time I drive at maximum speed, it slows down slightly. I don't know how to set the needle in the carburetor. Thx😀
Thanks! It sounds like you are running way too rich, sometimes this can be solved simply by setting your mixture screw to your temperature and elevation. I believe mine is either 1 1/4 or 1 1/2 turns out at sea level. If that doesn't fix it, make sure that your jets are both the right size for the mods that you have done (you can find charts online if you have an exhaust system). The charts usually have a needle spec too.
This site should help:
www.procircuit.com/jettingspecs4.htm
Hey PDB great answer. It’s not a problem I’m having or anything but good to know if I ever run into this & it’s not exactly a jetting issue; especially pointing out the Procircuit site. Thanks for that. Good work on the YZ- that’s nice! I love this stuff. Hope to see more. Damn good to know nice plastics can still be had on ebay lol.
@@pauldouglas9048 Thanks! Well if you ever do run into any problems, just let me know!
How much did it cost for everything
Great videos
Thanks!
Were you get the plastic side panals
eBay
Hey I know it’s been 3 years since you posted this video so I’m not likely to get an answer but I figured I’d try and ask anyway, I got a ‘99 YZ80 from a friend, had several owners and a few problems here and there. One thing that concerns me though, is there’s a lot oil and possible unburnt fuel coming through the exhaust, I’m wondering what oil to fuel ratio you’re running and if you have any suggestions because I’m at a bit of a loss right now. The top end was replaced a little over a year ago and I’m getting a new spark plug for it tomorrow, it seemingly rides fine but won’t stay idling for long and seems a bit underpowered. And it starts running a lot better when it’s almost out of fuel for some reason
Hey man, I sold my 80 a while back, but I always ran 32/1 in it. It kinda sounds like you are running rich. I’d recommend going though and rejetting your carb.
If you have an aftermarket expansion chamber, FMF has a good jetting chart somewhere on their website that I always reference when jetting a carb. Just search up yz80 fmf jetting chart. It should say the stock specs then the specs with a pipe.
I’d also get an oil that suits your riding style. I mostly ride slow trails and back roads with my yz250, so I use a lighter synthetic oil that burns cleaner at low rpm. It doesn’t have any unburnt oil coming out of the pipe. There are oil types for all kinds of riding, so I’d recommend looking into that for your riding style.
You could also have a blown right side crank seal and it is getting extra oil from the transmission. To test it real quick, pull the oil fill cap and put a small piece of paper over the hole. Then kick it over and if air is coming out of the oil fill hole, the crank seal is bad. It would be easier to do this test with it running if you can get it to stay running for a bit. Im not sure if I said it in my video, but I had to replace the right crank seal on mine and that is how I diagnosed it.
Also make sure your air filter is clean. Even though it’s probably not the main cause of your issues, a dirty filter will reduce power and cause a rich condition from the reduced air flow.
Hopefully this helps a little. Keep me posted on how it’s going and feel free to ask any more questions about it! Good luck👍
@@projectdirtbikes Thank you so much, I recently got it idling sort of steady and it seems like oil has stopped coming out. I'm still a little cautious with it but I think it's mostly ok. There was an air leak above the reed valves that I fixed with some gasket maker. That should be most of the issue, but my gear oil got milky somehow. I think there might be still some seal issue between the cooling system and the transmission, so i'll keep an eye on it for now and do some test runs in the meantime. Again, thanks for the advice
where did u get plastics
I got them off of eBay. there are lots of options there
Nice bike bro i just got one aswell but im actually having trouble with mine so my clutch cable wasn’t working anymore and i bought a new one but now im seeing that my actuator is not working either do u know why is that happening?
By actuator, do you mean the arm sticking out of the case that the cable connects to? And is the arm not moving?
Yes that’s what im talking about, so the arm moves but doesn’t go back into place it’s just loose theres no tension
I removed the clutch case and inspected it i checked the push rods and everything looked fine
If i push on the push rod it gives it tension but when i put everything back its still the same
@@Leroy.g10 sounds like something is wrong with your pressure plate. Or something that directly affects it. When you pull the clutch lever, does the pressure plate move?
What did you use to polish the yz80
WD40 and scotch brite, then aluminum polish with a microfiber towel. I have a video on my channel going over the procedure. czcams.com/video/ZgvkyGffkSY/video.html
Dang how much did you buy it for I’m looking at a bike and might need your help on seeing if it’s the right price
Hey sorry I just now saw your comment. CZcams does that sometimes. I got it for free since it was on its way to the dump. But I ended up selling it for $1700. Let me know if I can help with anything!
What size is that back rim
Stock size, whatever it is. I sold it a while ago
I'm old but I got a YZ 80
They're great bikes!
I want one. Do you think 1100 is worth it because it is in good rideable condition.
Hi, thanks for watching! Yes, I would say that would be worth it as long as the wear parts are also good. Like brakes, bearings, fork seals, tires, and chain n' sprockets. If one or more of those parts are worn, I would try to get the price down. The more you know about the seller's bike, the more you can use it against them.
I have your old 80
Hey, right on! Enjoy it! I had a lot of fun with that bike
@@projectdirtbikesya its really nice
Fact about "power" in 1998 AMA allowed 450cc 4-strokes to compete against 250cc 2-strokes as they proved to be reasonably fair and equally matched. Something doesn't add up in the math there and it is clear a 2-stroke motocross dirt bike is a lot faster and more powerful. That little YZ-80 you have there would give much larger displacement 4-stroke bikes serious problems. You can tell when you squeeze the juice on.........
l want this bike how much all give $200
😂
rev it out more you where not even in power band
7:45