School me on a YSR
- Thread starter Josh_SLR
- Start date
Wrong Way
Well-known member
I am pretty sure you will need to replace the motor with one of these
https://www.youtube.com/watch?v=j2zz_-gsy8U
https://www.youtube.com/watch?v=j2zz_-gsy8U
Josh_SLR
Insurance Broker
Hahahaha
Manimal
Mini-Moto Racing
:facepalm :laughing
this is off the top of my head .....
- Check inside of gas tank and validate it is clean; free of any corrosion, or anything that would affect fuel delivery. If corroded, you will need to clean it and treat it (re-seal).
- check the pet-cock to see if it is functioning correctly (fuel flow). replace if necessary.
- What history do you have on the motor (inquire from previous owner); Does it need a rebuild or has there been a rebuild, and how long ago. If a rebuild is needed, get a rebuild kit from Team Calimari Racing
- New Gas w/ premix (typically 32:1 ratio), if not oil injected.
- If oil injected, fill with fresh 2-stroke oil (labelled "injection only")
- drain and replace motor oil.
- clean the carb. A tear down may be needed; to ensure all the internal jets are clean for proper fuel delivery
- Inspect air filter. Replace if necessary
- Need a new battery? replace it (6v)
- inspect the spark plug, and check for spark. Replace if needed.
- Inspect tires, and replace them if necessary. inflate to proper psi (18 - 20psi)
- Go through the bike and check for any loose fasteners (bolts and screws).
- inspect clutch and throttle cables. Adjust if necessary, or replace if needed.
- After all have been checked and or replaced, using the choke, and several kicks later, it should fire right up. Or bump start (in 2nd gear), if need be.
- If started and running, inspect all the lighting (low - hi beam, and blinkers) and horn are functioning
report back to us if / when you get it started.
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Josh_SLR
Insurance Broker
I will do a full tear down and a once over on the bike for sure. I am looking more for what needs to be fixed from the stock bike. Does it need braces made or new wiring done. What are the failure point on these bikes. I am getting it from a friend for $500 and it is super clean. The bike hasn't run in 10 years so I am for sure going through it with a fine tooth comb.
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Manimal
Mini-Moto Racing
The YSR's are pretty solid bikes, as long as you don't seize the motor (if that's what you mean by failure point) 
Speaking of, if ridable and motor running at it's best, when near or at full throttle, VARY your rpm's. In other words, don't hold it pinned for a long period of time. Let off for a bit, then back on. Rinse, and repeat as needed. Keep in mind, the motor runs it's hottest and leanest near or at full throttle.
There's a good chance the previous owner did not mess with the jetting. But, it does not hurt to inquire with Team Calimari racing what the factory jet is for a stock YSR (non-modified), and validate your current Main jet.
It looks to be a complete stock, street YSR. In other words, has not been stripped down to be a dedicated race and or track bike. Which means, there's a good chance the harness is intact, not butchered.
Once you get the fairings and tank off, start looking around. That is when maybe the obvious will appear. download a YSR shop manual when you get a chance.
Not sure what you mean by braces. No braces are needed. Sure, there are some things to improve; i.e. suspension and other "race / track" bits, and or performance goodies. But, in stock form, and as long as the motor purrs, you should need nothing. Just throttle and go with the biggest smile on your face. Although, keep in mind, it is a 50cc air cooled 2-smoker, so it's not going to be super fast. But, has a fun factor to it. More especially on the track :teeth :ride :teeth
Speaking of, if ridable and motor running at it's best, when near or at full throttle, VARY your rpm's. In other words, don't hold it pinned for a long period of time. Let off for a bit, then back on. Rinse, and repeat as needed. Keep in mind, the motor runs it's hottest and leanest near or at full throttle.
There's a good chance the previous owner did not mess with the jetting. But, it does not hurt to inquire with Team Calimari racing what the factory jet is for a stock YSR (non-modified), and validate your current Main jet.
It looks to be a complete stock, street YSR. In other words, has not been stripped down to be a dedicated race and or track bike. Which means, there's a good chance the harness is intact, not butchered.
Once you get the fairings and tank off, start looking around. That is when maybe the obvious will appear. download a YSR shop manual when you get a chance.
Not sure what you mean by braces. No braces are needed. Sure, there are some things to improve; i.e. suspension and other "race / track" bits, and or performance goodies. But, in stock form, and as long as the motor purrs, you should need nothing. Just throttle and go with the biggest smile on your face. Although, keep in mind, it is a 50cc air cooled 2-smoker, so it's not going to be super fast. But, has a fun factor to it. More especially on the track :teeth :ride :teeth
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thePUNISHER
RAMPAAAAAAGE!
:rant Where the hell is my friend with a sweet $500 YSR?!?!? :laughing Of all the bikes I've had I miss my YSR the most. Like Manimal said, they aren't the fastest but man the fun factor is thru the roof! I've been on the look out for a basket case YSR that I can take my time putting back on the road with a DT125/175 motor.
SpeedyCorky
rides minibikes;U should2
damn thats a solid deal on a nice YSR
u scored!
u scored!
Josh_SLR
Insurance Broker
I know and I'm super excited for it. It's going to be the wife's bike
SpeedyCorky
rides minibikes;U should2
:laughing
thats what they all say.. wait 'till u ride it !!!!!!!
:loco :ride :teeth
thats what they all say.. wait 'till u ride it !!!!!!!
:loco :ride :teeth
Maddevill
KNGKAW
+1 I bought one when they first came out and my friends and I had mega parking lot races. Then to Prarie City. Then I put a YZ80 motor in it. (Very easy install) and I had a mini GP bike!! Whoo hoo! GEt ready for some fun times my friend.:thumbup
Maddevill
KNGKAW
Well none are a direct bolt in. I used a 1993 and had to make a rear hanger for the rear mount. The front mount was basically a straight fit. Of course you have to mount the radiator too. I used the stock YZ pipe so I had to trim the fairing a bit. I also boxed in the steering head and swingarm pivots to give the frame more strength. Anyone with basic fab skills can handle it.
horsepower
WaterRider/Landsurfer
I bought Maddevils bike.
My friend blew up the motor the second ride out, he was an A&P airplane mechanic so you'd think he'd have a clue without pre run lessons, but noooooo
so here's some important basic but pertinent tips if your wife is going to run it.Explain to her that these are two stroke dirt motors; warm it up brapp braaap braap. Can't be held wfo forever like a Fi.
Get a carb kit and keep it handy.
Once modified the chassis as mine was, a Yz80 from 1995 to 2006 bolted right in. Any bigger and your wife will not like it. It's rippy enough as an 80.:ride
Tires last forever on these things and are available on ebay or through Dunlop for next to nothing.
I have a shit ton of spare YSR stuff I was going to post on ebay and SpeedyCorky has a few of my cylinders I think too so let me know if uou are in need of anything.
SpeedyCorky
rides minibikes;U should2
um, i dont have any YSR cylinders (?)
I still got that Suomy helmet of yours tho.
oh, and u missed an epic fun day at Thill this past weekend with NCRC.... like E P I C....
+1 on dont put anything bigger in there than an 80cc 2 stroke; especially if the wifey is gonna ride it.... unless u got some good life insurance on her and want that naggin' bitch outta yer hair!!! :laughing :later
j/k of course!
I still got that Suomy helmet of yours tho.
oh, and u missed an epic fun day at Thill this past weekend with NCRC.... like E P I C....
+1 on dont put anything bigger in there than an 80cc 2 stroke; especially if the wifey is gonna ride it.... unless u got some good life insurance on her and want that naggin' bitch outta yer hair!!! :laughing :later
j/k of course!
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Manimal
Mini-Moto Racing
IIR, the older air-cooled YZ80 motors are a direct fit; 75-79, again, IIR.
Just bolt in a YSR stator assembly, and you have lights. I had never fitted or owned one, but there is a lot of info about those that have done it. See YSR50.com website.
If you plan to have your wife ride it, I do not recommend any of the water-cooled 80 / 85 motors. They make monster power, and she'll have trouble keeping the front end down. Trust me (I had a KX80 in one of my YSR's back in the day). Unless, perhaps, she is an experienced rider.
OTOH, the DT motor swaps are common as well, and make decent power, throttle is very mild and manageable.
If you can get your hands on a Derbi 50 motor, that is one of the best upgrades, IMO. Not sure what parts availability are these days. It is a water-cooled motor. Just fit any of the after-market YSR exhausts w/ a NSR radiator, you're good to go. This motor makes good power, very durable and ride almost forever. I had one, and was the best motor swaps I had ever done.
Otherwise, if you're into 4-strokers (lots of torque), the sky is the limit .... XR100 w/BBR120 kit is a good start.
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