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post #1 of 18 (permalink) Old 05-25-2010 Thread Starter
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Question 250cc

I found a cheap 250cc motor around town and I was seriously considering doing a swap on my x19.

YES I DO KNOW IT REQUIRES QUITE A BIT OF FABRICATION

I was just wondering if it has been done before. I've measured, and It will fit with some new mounts, and some clearancing. I'm just thinking that this could be one hellish machine with a 250 on it.

I have a welder and really all the tools to do it, i just want to know if it has been done.
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post #2 of 18 (permalink) Old 05-25-2010
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Re: 250cc

That big I don't think so?

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post #3 of 18 (permalink) Old 05-25-2010
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Re: 250cc

It's been done before in an x18 with very little mods.You'll be the first that i know of to put one in an x15.Heck if the price is right and you got the tools.I say go for it!........Just something with that stock swingarm.It will bend or break when you least expect it.

I'm a young man trapped in a old man's body.But i guess some people would call that immature.
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post #4 of 18 (permalink) Old 05-26-2010
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Re: 250cc

Is it a 250 2 stroke or 4 stroke? I know someone with a YSR 50 that he swapped in a KX250 motor into, shortly after he swapped in the KX250 swingarm as it is still nearly impossible to keep the front tire on the ground.
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post #5 of 18 (permalink) Old 05-26-2010 Thread Starter
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Re: 250cc

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Is it a 250 2 stroke or 4 stroke? I know someone with a YSR 50 that he swapped in a KX250 motor into, shortly after he swapped in the KX250 swingarm as it is still nearly impossible to keep the front tire on the ground.
4 stroke. It was on a go kart and they only want 300 for it and it is clean as a whistle. I plan on reinforcing and extending the swingarm to keep it safe and on the ground. I'm just thinking about how quick it will be once it's up and running. I figure it will be a couple weekend project.

I ride my x19 legally right now around town. I got insurance and all that junk on it now. I would just like to have more power for uphills and streets that aren't that busy. I've checked via GPS and I can get up to 55 on a flat road easily right now, but being able to do 80+ would be really nice.

I know there is a guy that got the 160cc bore kit and can hit 89 ish, but hitting over 100+ would be nuts. I just couldn't imagine driving on the interstate and being passed by a pocket bike doing 80 lol.

I would never ride on the interstate, but it would be hilarious.

I'm not going for building a big racer bike, but having this pocket bike that can beat cars off the line would be great.
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post #6 of 18 (permalink) Old 05-26-2010
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Re: 250cc

is it a bike engine? It is possible as swheels said you would need to strengthen the swingarm. If its a bike or quad engine it has gears which would be great.

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post #7 of 18 (permalink) Old 05-26-2010
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Re: 250cc

If it's the honda clone 250cc 4 stroke,in stock form. I'm pretty sure it's not making enough power to put you that far over the 80mph mark. Plus that bike that did you said did 89's.On the video he posted it did 85mph going down a hill.Plus the kid had his 160cc motor built by someone.So it wasn't a stock 160ccc motor.
You still would have some fun though.Even if it's just a cruiser,it wouldn't hurt to have better tires and brakes.Especially with the extra weight of that motor.Oh plus some suspension.
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I'm a young man trapped in a old man's body.But i guess some people would call that immature.
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post #8 of 18 (permalink) Old 05-26-2010
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Re: 250cc

with that 350 you probably could hit 100mph. i know a guy that put a lifan vert 200cc engine in a ysr, and with 15/37 gearing, he did 107 on a GPS. that engine has like 17 or 18 hp.
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post #9 of 18 (permalink) Old 05-27-2010
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Re: 250cc

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with that 350 you probably could hit 100mph. i know a guy that put a lifan vert 200cc engine in a ysr, and with 15/37 gearing, he did 107 on a GPS. that engine has like 17 or 18 hp.
That guy must have done something else to the motor.1. those are stock gearing for the midbikes even with the 5spd tranny 107 will not be obtainable. Infact i watched a video awhile back of a guy from Cali.Who had a 200cc lifan in his ysr.It only did 65mph according to the owner.Those motor stock form don't pull enough rpms for the gearing to break the 100mph mark.

I'm a young man trapped in a old man's body.But i guess some people would call that immature.
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Re: 250cc

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That guy must have done something else to the motor.1. those are stock gearing for the midbikes even with the 5spd tranny 107 will not be obtainable. Infact i watched a video awhile back of a guy from Cali.Who had a 200cc lifan in his ysr.It only did 65mph according to the owner.Those motor stock form don't pull enough rpms for the gearing to break the 100mph mark.
I think that he added a different carb but there really isn't much that you can do that lifan. You probably won't believe this, but there is a guy that I know that put a horizontal lifan 150 in a ysr & he said that the bike would do 90. His username is nooblet.
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Re: 250cc

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I think that he added a different carb but there really isn't much that you can do that lifan. You probably won't believe this, but there is a guy that I know that put a horizontal lifan 150 in a ysr & he said that the bike would do 90. His username is nooblet.
Yeap i've spoken to noob. Naw i'll disagree with that,unless he had some serious motor work done. There is some much that goes along with just throwing a big motor in a bike and thinking it's gonna break 90mph to 100mph.
This is my idea of fast.That custom dragbike that XMR did up. I think it did 70mph in an 1/8th of a mile.They couldn't even get the rear tire to hook up.LOL I was impressed with that!
You can build those clone motors up.Ya just gotta know you want and how to do it.
For the record though,you i really don't care much for a straight line bike.Even if it could hit a buck20 going against the wind.LOL If it ain't carvin some turns throwing down fast laptimes. For me it's not worth riding.

I'm a young man trapped in a old man's body.But i guess some people would call that immature.

Last edited by swheels; 05-27-2010 at 04:00 PM.
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post #12 of 18 (permalink) Old 05-27-2010 Thread Starter
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Re: 250cc

yeah, i'm still doing some research as to what will be needed. If i can get this motor, change my gearing, and get everything running okay, then we'll see what it can do. If it hit's 80, I'll be happy. I just want it to be more realistic as a bike to take around town. hitting 50/55 around town isn't that spectacular, and i'm lucky to hit 45 up a hill, i couldn't imagine how it would be like that in heavy traffic.
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Re: 250cc

ive rode in traffic plenty of times on my x18
bike prolly topped out in the 70s and that was a stock 150
i hit 73mph in my 125 also
i agree that you need 90mph speed capabilities on the highway, but i did ok
around town you dont want a irk, it could die at a light, or you have to keep the idle high
the ork seems to be ok, i havent stalled it yet

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Re: 250cc

So any updates?
I was thinking about getting this bike and wanting to do somethign similar.
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Re: 250cc

personally i wouldnt go with the 250cc motor
the 160 block with upgrades should hit 100 easy

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YX 184cc, V2 head, decomp, Yoshi RS9 exhaust, 14/28 gearing, vee rubber race tires, S-Tech forks, dual caliper brakes, flipped swingarm with fastace shock, see my bike at http://www.youtube.com/profile?user=blitzminc
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Re: 250cc

Would a 160 still maintain 55-65 uphills ? i live on the coast and need it to get me up some steep hills and not get run over,lol.
Im not to concerned about doing 100 flat out , just need power for hills.
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Re: 250cc

oh yea it will

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Re: 250cc

It won't work. It would tear the frame apart. I have seem regular modified motor crack frames. So a 250 would just rip it apart. You would need to make a custom one off frame just to handle the TQ of that motor.
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