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xr50 motor in a ysr?

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#4 ·
I wonder if the head would hit the front wheel under heavy braking???

I saw this article awhile ago and have been thinking about making one ever since. Any one interested if i make more than 1??

It seems like a better route than the xr100 for me because of cost and mods available. It seems hard and a little expensive(compared to buying a Lifian or GPX, ect.) to track down a decent xr100 motor. Mods for the xr100 seem more expensive than mods for the Lifian's and GPX's as well.
 
Discussion starter · #6 ·
chester3000 said:
I wonder if the head would hit the front wheel under heavy braking???

I saw this article awhile ago and have been thinking about making one ever since. Any one interested if i make more than 1??

It seems like a better route than the xr100 for me because of cost and mods available. It seems hard and a little expensive(compared to buying a Lifian or GPX, ect.) to track down a decent xr100 motor. Mods for the xr100 seem more expensive than mods for the Lifian's and GPX's as well.
Click to expand...


i feel the same way about findign a decent xr100 motor. dont get me wrong abotu the xr100 motor. but i am haveign a hard time findign a decent xr100 motor for under 400. then i would also have to pay for shipping and a carb and a a harness and then i would be into the motor alone for 600 or more. and if i wanted to bore it i would have to spend a few more hundred. im going home try it out.
 
#8 ·
I'll let you know. I have several XR80/100's and I'll have a new YX150 in a week or so.



The XR 100 is limited by the head, for sure. Depending on displacement class, it can be very competitive. I use the 80 bottom for the 1.5lb lighter crank, better gearing, and price;)
 
Discussion starter · #9 ·
all i really need is for the motor to be able to hit 80mph at max so that i can keep up with traffic going 60mph and still have a little more to go just incase i need it. so a souped up xr50 motor should be more then enough.
 
#12 ·
808stunna said:
cr80 motors are easier to find but are more expensive cause everyone wants those motors. plus i kinda want a 4 stroke as the power plant.
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saw one a couple of years ago a guy put an rz350 motor in. looked cool dont know how it would of been to ride. didn't someone put an xr200 engine in one?
 
Discussion starter · #14 ·
turn8a said:
saw one a couple of years ago a guy put an rz350 motor in. looked cool dont know how it would of been to ride. didn't someone put an xr200 engine in one?
Click to expand...


there have been a bunch or cool mods over the years. the biggest motor in a ysr is a yz400f bored out to a 426. i wanna do a motor swap without any cutting and welding of original mounts or brackets. i can fab up a braket for the xr50 motor no problem. so until i find a diffrent motor i guess im gonna do the xr50 motor.
 
#15 ·
I had talked to Joe Lanza about the xr50 YSR bike and the front tire hitting the head was an issue for racing but it sounds like it was a fun bike to play around with. An XR100 motor that is in good condition is going to be $500 on up, but its worth it when you consider the performance advantages. I put one in my NSR and I have been pretty happy with the power so far but have yet to take it to the track and see how it does.
 
#16 ·
I did a 118cc 80 with bored cases, sleeved jug, porting, Web cam, lightened crank and FW for well under $500. My Lifan headed 55.5x45 110 class XR80 motor is almost complete and should be a contender for cheap. If there's no limit or for a streetbike, a 200 or 230 would make good power though.





I'd love to put an RD125 twin in a YSR, for a little howler.
 
#17 ·
chester3000 said:
Any one interested if i make more than 1??

It seems like a better route than the xr100 for me because of cost and mods available.
Click to expand...
if you do let me know. i'd be up to try it out.



Bri6672 said:
I had talked to Joe Lanza about the xr50 YSR bike and the front tire hitting the head was an issue for racing but it sounds like it was a fun bike to play around with. An XR100 motor that is in good condition is going to be $500 on up, but its worth it when you consider the performance advantages. I put one in my NSR and I have been pretty happy with the power so far but have yet to take it to the track and see how it does.
Click to expand...
i'd love to check out that nsr of yours sometime and see how you did up the brackets for the 100 motor.
 
#18 ·
supernes550 said:
if you do let me know. i'd be up to try it out.





i'd love to check out that nsr of yours sometime and see how you did up the brackets for the 100 motor.
Click to expand...




Here are a few pics that show the brackets, they were pretty easy to make just took some time to get them lined up perfectly. I am pretty happy with the bike so far, I just need to get the jets dialed in and I should be good to go for some track days.
 

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