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Old 01-29-2015, 01:25 AM   #1
rat110 OP
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250cc for a road bike / race bike

Guys, I am thinking of a little project bike.
I'm thinking of getting a Skyteam Ace 125 ( http://www.motorcyclesupermarket.com...F2_Special.jpg )

and wedging an RGV250 engine in it. Putting some drag bars on the back and drag race it, and see if I can get it on the local race tracks (rules are quite strict here).

I found an RGV250 engine in running order, but they want $1600aud for it.

I was wondering if there are any 250cc 2 strokers from dirt bikes that would make similar power, and can be geared for racing? In place of the RGV and the RS250 engines. They command stupid money down here.

I'd love to get it road registered with the RGV donk, however I would have to jump through so many engineering loopholes it wouldn't be worth my time. And the registration and insurance fees would be too much on top of it all again.

I have a company that will modify the frame and make engine mounts to suit whatever engine I bring in.


Thanks for the help guys.
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Old 02-01-2015, 11:39 AM   #2
Kennon
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I would steer clear from MX 2 strokers will make good power but will need rebuilding a lot more, what about a NSR 250 engine? TZR, RD plenty of two smoke engines to choose from.
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Old 02-01-2015, 01:18 PM   #3
hugemoth
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The RGV250 engine will over stress the bike. Stock engine has about 10 hp and the RGV has close to 50.
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Old 02-03-2015, 02:06 AM   #4
rat110 OP
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Originally Posted by Kennon View Post
I would steer clear from MX 2 strokers will make good power but will need rebuilding a lot more, what about a NSR 250 engine? TZR, RD plenty of two smoke engines to choose from.
Thanks for the other 2 smoke suggestions. I'll have a look on ebay and gumtree (aussie craigslist) and the wrecking yards for those options.

Having never really been around motorcycling types, and having never owned a 2 stroke, I really don't know whats out there and whats suitable.
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Old 02-03-2015, 02:19 AM   #5
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Originally Posted by hugemoth View Post
The RGV250 engine will over stress the bike. Stock engine has about 10 hp and the RGV has close to 50.
I had thought about that Not overly much mind you.
The guys at the bike shop (Deus ex Machina in Camperdown NSW) mentioned that as well when I was telling them about the project. They can brace the frame and beef it up without much problem.

If I buy a wrecked bike I can take the brakes off it to make it a little safer too. I wonder if I can make the rims fit? Or rims off a 125 sports bike?

I think this will be a "I have a small bike and a big engine. Lets make it work!" type of project.

It will be a barrel of monkeys to ride at roughly 500hp per tonne
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Old 02-03-2015, 07:59 AM   #6
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forget the mx250/rgv250 by the time it's braced enough to not kill you in a straight line (never mind an actual corner) the only stock part will be the tank and seat.
since you're near NZ (well that hemisphere at least) have a look for some thing like a rgv150, plenty fast enough for a giggle. I'm a bit too squeamish to watch some body ride a rgv250 powered skyteam 125..
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Old 02-04-2015, 06:39 PM   #7
JonW
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Quote:
Originally Posted by rat110 View Post
I had thought about that Not overly much mind you.
The guys at the bike shop (Deus ex Machina in Camperdown NSW) mentioned that as well when I was telling them about the project. They can brace the frame and beef it up without much problem.
LOL course they can, with an open chequebook anything is possible. And, really I agree with the rest of the guys, whacking 50bhp into an Ace is asking for trouble, by the time you done it with wheels and brakes from and RGV youve lost most of the Ace anyway.

Maybe try a larger honda based single, it will fit the frame cleaner and not need so much work. If you bear in mind that an SR500 is about 35bhp on a good day, an older honda 250 or 350 in the Ace frame would work well and possibly look standard enough to pass some rego i would think.

I started putting an RZ motor in a KTM EXC frame for motard work a few years back, it was not easy and in the end i put it on the back burner, one day i might have another go, that frame was at least rated for 50bhp in 380 form etc. but still converting an older style single into a modern twin is not something for a first project, there is a lot of engineering to overcome. Fun tho...
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Old 02-04-2015, 08:54 PM   #8
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Just buy an RS250 and be done with it.
Learn how to set up carbs and you have something that'll take litre sports bikes provided there are enough bends to keep the top speeds down.

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