CTD-Fab

Just thought you guys would like a sneak peak @ one of my new projects.

1989 ysr-50 that was bought pretty messed up. Picked up a downed 1995 ninja 250 with 5,000 miles on it for $200. Out with the little single and in with the monster 250cc twin with 14,500 redline

I'm about a quarter of the way done. Still have a few engine mounts left and I'm going to stretch the swingarm about 5 inches for a little stability.

What do you guys think?

According to some bike calculators it should run a 12 second quarter. The 250 engine only added about 45 lbs and it may be a little hairy riding it since its only about two feet tall, haha.

Fenrir51

Cool project

Two thumbs up if you complete it.

MY_EL_1

Nice good luck, ever think of putting in a 250 two stoke motor out of a motocross bike? It might fit a bit better. My dad has 2 YSR 80's and 1 YSR 50.

javierb14

looks like it fits well! wheelies???

legendboy

I will try and find pictures of a ysr swap i did. I put in a 250cc chinese motor

legendboy

only one i could find

bad-monkey

I think it'll need a lot of suspension work--the stock forks/shocks on those YSR are pitiful.

But it should also be fun as hell, haha. doing 100 mph on a minibike would scare the crap out of me.

I dunno if you're looking at it as a drag bike only, you'll def need to stretch the swingarm and strap down the front.

scartail

There was a guy who shoved a 250 2-stroke into a Hysung/UM fullfairing street bike. You can find a clip of it youtube. It looked and sound awesome. Must be wicked fun on the streets. I would like to do one of those.

Are YSR 50's street legal?

Quiks66

YSR50's are street legal if they were registered a while ago but it's nearly impossible to get one plated nowadays.

Keep it up on that project, would love to see how it all comes together. Keep in mind that the EX250 motor you have will rev out to 14-14.5k rpm, but it makes peak power just after 12k rpm, so after that you are just spinning out to nowhere. Cool deal

CTD-Fab

Thanks for the replies guy

I decided on the ex250 engine becuase i couldn't pass up the price and I have a bone stock ninja 250 that I ride and its a blast, well up to about 90 mph anyways

It actually fits better then I had originally planned and there should be plenty of room for everything. I have already contacted the local DMV and I was told by the inspector that I shouldn't have a problem getting a "new construction" title with the frame being so modified. It will be street legal and I plan to ride this thing as much as possible.

I also have plans for the engine after everything is up and running. After being the head designer for Full Race for 3 years I now have a love/need to turbo pretty much everything I can. The only problem with the 250 engine is that they tend to have oil delivery problems when you bump up the power. I was thinking about doing a little home porting and adding an oil accumulator. I don't know what turbo I will end up with, just got to see what comes to me on the cheap. Probably a small Saab LPT...


Sweet swap man! How was that thing to ride after? Even with the tired original 50cc mine was a blast.

CTD-Fab

this would be so perfect!!!

super tiny twinscroll

m R g S r

I hAve a gt17 I'll sell ya if u want some boost :D

JDMCRX

iTrader: (2)

turb on that thing would be retarded . Mega squirt or something lol.

CTD-Fab

A gt17 is a little big for this app but how much and what kinda shape is it in? I put a gt17 on a friend's 79 rabbit but modded it to have a 3" outlet right off the turbine, sounds amazing.

Rednas

Wow!!!! any updates on this?

RickyLee53

I've got a similar project with a mobility scooter* and a 200cc 2stroke twin.

*Not sure what you call them in the US. 1 of these

http://electricwheelchair-electricsc...ty-scooter.gif

lou-tdi

^^ thats guna be a lot of fun!

rez650crx

First thought - This guy is CRAZY

Second thought - He is going to turbo it WTF

Third thought- DAMM you got ***** and crazy

Rednas

and it was never finished.

legendboy

mine was

CTD-Fab

lol, its still on the back burner. Sitting in the corner patiently waiting

Here are a couple other big boy bikes ive done/in progress since then.

Ninja 250 Fighter


Honda CB-1 fighter project



One day, one day