Re: Retarded engine swap idea...Ninja 250 motor in Rebel 250? Possible?On Mar 18, 4:41 pm, Rick Cortese <ricor...@earthlink,net > wrote:
> Forkbeard wrote:
> > On Mar 17, 7:15 pm, "LJ" <laremoDel...@yahoo,com > wrote:
>
> >><squidstheb...@gmail,com > wrote in message
>
> >>news:f2929677-3a08-4817-88ce-ae18094a7b6d@8g2000hsu.googlegroups,com ...
>
> >>>I haven't actually measured the engines to see if it would even be
> >>>possible to fit an EX250 motor in a rebel 250, but it seems like the
> >>>radiator and related stuff could be mounted on the rebel frame with a
> >>>minimum of hassle, and getting the front and rear sprockets to line up
> >>>should theoretically be doable, and I'm already thinking about how to
> >>>adapt the controls...Has anyone already researched and shot down this
> >>>idea? Or, conversely, know if it would be possible and have any
> >>>suggestions? I like the idea of the tiny little cruiser that can
> >>>actually go fast, . Plus, I'm over 6'1, so I'd look like a clown on a
> >>>tricycle on it, which would be pretty awesome. Thanks!
>
> >>Yeah, it'll bolt right up. I know a guy that made the swap in a weekend.
> >>The only problem he had was the hose clamps fubarred on him when he took
> >>them off the old bike so make sure you have a few spare clamps around. Have
> >>Fun!
>
> > Awesome. Anyway, the ninja motor could potentially get me far more HP
> > than the rebel just because it's actually possible to find performance
> > parts for the ninja. Also, I don't need a ninja 500...I already have a
> > v45 Sabre and a kz650, I've got "cheap sport bike" pretty well
> > covered. This was inspired by me recently seeing a rebel with a blown
> > motor for $400 and a beat-up ninja 250 stuntbike with no title for
> > $300. I know that those kinds of deals don't come around that often,
> > but $700 plus some work for a zippy little goofball cruiser that's
> > very unique seems like not a half-bad deal. If I can find deals like
> > that again, I may just go for it.
>
> Far be it from me to rain on anyones freedom of mechanical expression
> but I would rest easier if I get the impression this is a practice run
> before you get real serious about it. IOW: It is your first practice run
> at mechanical artistry.
>
> The reason is there are actually good reasons for doing swaps. Super
> Motard with a combination of [MX, road bike], hill climb with a
> combination of GP MX or in line 4 cylinders, V-twins, et cetera, land
> speed record bikes cobbled together from road race frames and faring
> with whatever engine class you think you can beat the clock with.
>
> *BUT* you see the pattern here? Typically you combine two or more
> separate genre such that you end up with a bike that is suitable for a
> third. For instance, had you picked a chassis that is world renown for
> its great handling but underpowered, it would make huge sense.
>
> Because it is there is a good enough reason for me but it just makes for
> more interesting topic if it actually solves at least one problem
> without creating two more. You are solving the low horsepower problem
> and maybe possibly getting a [braking stabilitiy, high speed wobble,
> traction, gearing, cornering problem] because of your chassis choice.
> Understand if you come back and say "I had to lenghten the swingarm two
> inches to eliminate tank slappers" it helps, but you have to be
> committed to learning stuff like that or risk finding out why they make
> sandpaper out of tiny little rocks.
>
> Rick
I understand, but they way I see it is this...they are both the same
size engine in the same format, with similar dimensions, so center of
gravity will change less than it would with, say, a fat guy riding it.
The top speed of a rebel 250 is around 80. Well, the ninja 250 I rode
topped out at about 92, so I don't think there's a huge chance of
increased wobble. The exhaust will be something to figure out,
because I don't want a sportbike exhaust on it, so I'd probably have
to re-jet if I can actually wrangle the rebel exhaust onto it, or
figure something else out. I know the rebel brakes aren't impressive,
but the idea isn't to have a canyon-carver, so it shouldn't be a huge
issue. Anyway, I figured that my first engine swap project SHOULD be
something like this, where everything is low-powered enough that if
something goes wrong, the bike isn't going to tear itself apart and
make me hamburger. It's all theoretical at this point anyway. The
earliest I could consider getting into something like this is 3 or 4
months down the road. I do appreciate the input.