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2strokegirl
29th November 2007, 09:05
has anyone looked into switching the twin for a 4?? i noticed that there is alot of wasted space under the fairings and with a few modifications would it be possible to put a bandit or cbr engine in??
PirateJafa
29th November 2007, 10:04
You want a Bandit in a sheep's skin- err, fairings?

Sneaky. :P
Unforgiven
1st December 2007, 19:24
Its not impossible, nothing is.

Ive helped out with some pretty crazy conversions in cars, but never bikes.

Main thing would be making engine mounts and getting the driveline/gearshift all in the right places.

It may mean cutting out a lot of frame if the front sprocket and gearshift is in a bad spot on the gearbox.

Anyone who can post some pics up of the 2 motors in and out of (original) frame if possible???
necrolyte
1st December 2007, 19:31
I had me one of them '88 two fiddys... would be nice to think it would accomodate a bigger engine... good luck
MidnightMike
1st December 2007, 19:33
What would be the reason for doing this?

Seems like a lot of money and fuss...
delusionz
2nd December 2007, 10:47
don't worry about it aye... for too many reasons to list...

why don't you like the Kwaka twin? The motor and the bike go hand in hand, in other words really you don't like the bike?

Btw what's happened since you've debaffled the cans? and how did you manage to put them back together? do you have to saw off the lid and re-weld it?

I notice (or don't notice) my exhaust it's so quiet
deanohit
2nd December 2007, 10:58
Why not something like a GPZ550 or something. Stil a twin in similer fairings just with a bigger engine.
2strokegirl
3rd December 2007, 07:45
to debaffel it all i had to do is drill out the pot rivit thingys and the baffel just came out. and thats how i left it. they have to go back in to get a warrent aparently. the guys in the shop said its to loud to get a warrent.

also since having the baffels out its a killer on the top speed but it seems to give alot more grunt in the lower revs... does way better wheelys now.

i like the twin but just wondering what the bike would be like with a 4.
FilthyLuka
3rd December 2007, 13:45
put a 660 single in it
delusionz
4th December 2007, 23:13
Thats interesting to know.. so when you drill out the pop rivets out does the lid come off and does it go back on?? do you need to thread it and pop bolts in place of the old pop rivets? I'd love to try it but don't want it ending up looking like a little black tube inside the middle of a big gaping hole.
jeremysprite
4th December 2007, 23:14
an ex500 will drop straight in apparently
put some decent suspension/tyres on it, and you'll love the thing to bits.
deanohit
4th December 2007, 23:20
Had a ride on my mums old EN500, same motor as the EX500, it had some go to it.
delusionz
4th December 2007, 23:56
I ran into this a while ago

http://faq.ninja250.org/wiki/I_want_to_put_a_bigger_engine_in_my_Ninja

I think any advice along these lines should be sought from this page.

Blunt but true... Sorry!!!!! Besides this is your bike, don't turn it into a project that gets on the road once a year. It says GPX with flames, that means it's a very recent model... In the garage in bits is no place for a new bike lol...

Just ride it, love it, get your full, get a new bike
2strokegirl
6th December 2007, 14:41
the black cap is attached to the baffel all you need to do is drill out the rivits and pull the baffel out. i was going to make a plate to go where the baffel is rivited onto the can so it looks like its standard but i dont realy see the point.

and no i dont want to hack up my bike lol i was just wondering if anyone had looked into it.
2strokegirl
6th December 2007, 14:49
and just adding to the bigger engine suggestions... i wasent refering to a bigger cc rating i was thinking along the lines of a cbr250 or something thats paralell to the bars.
delusionz
15th December 2007, 00:16
Nah there are too many factors that would make it impractical if at all possible. Not to mention the different spread of weight and the increased pressure on the already small frame from the extra power and vibrations of 7000 more rpm.

The kawasaki 250cc dohc twin is the only motor suitable for a gpx250 frame i'm afraid.

I think your buzz is like mine, I want a 2007 250cc sports bike too.... but in 2009 I'll have a full license and I won't want a 2007 250cc sports bike then


I've learned to appreciate the GPX for what it is, I wish it looked cooler but hey... shes my baby and now the cars gone shes my only mode of transport so I appreciate her even more :D
delusionz
1st February 2008, 02:37
*excuse for notification*

sup 2smokegurl, could you do me a favour????? :D have a look on your rear sprocket and tell me what number it reads, I noticed the other day that mine said 43, as far as I was aware the standard rear sprocket for a gpx250 is 45 teeth.

(This 2 teeth reduction adds 8kph to the top speed)

Just interested to see if 43T was fitted by my dealer or if thats the norm for NZ new models?
skidMark
1st February 2008, 02:53
sup 2smokegurl, could you do me a favour????? :D have a look on your rear sprocket and tell me what number it reads, I noticed the other day that mine said 43, as far as I was aware the standard rear sprocket for a gpx250 is 45 teeth.

(This 2 teeth reduction adds 8kph to the top speed)

Just interested to see if 43T was fitted by my dealer or if thats the norm for NZ new models?


Doesn't each Ninja sticker add 8 HP? :banana: