Engine swapping

[zeRax]

ho hum, is engine swapping relatively straight forward? i understand that depending on existing bike and engine u want to dump in it u may need to look at carbs, exhust, tune it all right etc, what would dumping a zxr 400 engine into my zxr250 involve ?_?

im curious on anything engine swappign related~

[zeRax]

sorry, should have been in sub forum :o

[crash harry]

...what would dumping a zxr 400 engine into my zxr250 involve ?_?

I think that one's been looked at many times by 250 riders wanting to go faster and look legal... It don't fit in the frame unfortunately, neither does the CBR400/250.

One that has been done a million times is FZR600 into FZR400 - cos the frames are the same dimensions, just the 600 is steel and the 400 is alloy. Another popular one I know of is early ZX9R engine into ZX7R frame. I think it works for 'B' model 9R engines and most '90s model 7R frames.

The best one I've heard of though is CBR900RR Fireblade engine into ZXR400 frame! :banana:
Linky -> http://www.zxrworld.co.uk/zxr400/eds.html

[DEATH_INC.]

Not familiar with ZXR's,but engine swaps can vary from bolt-in changes (like the old gixxer 7-11's) to farkin near impossible,like trying to fit a ZX12 engine to a ZZR 250.
You need to do a shitload of measuring on the engine,sprocket offset,sprocket height,rear lower engine mount is fairly important as it's one of the hardest to accomodate,basics like length,width (head especially) and height,and don't forget to see if the carbs will fit under the tank(preferably with an airbox) and that the radiator will still fit between the exhausts and front wheel.
Then be prepared to do a heap of cutting and welding,and making lots of mounts and brackets.It will be twice as much work as it looks.Then there's the headaches of making the suspension work with the heavier engine and of course certifying.....
But it can usually be done,I've seen piccys of a cbr400 with a 900 blade engine in it,a gsxr 400 with an 1100 engine,an old srad gixx like mine with a newer thou engine,a ZX7 with the ZX9 engine,and one of the bike mags did a blade with a blackbird engine.I had a VFR400 (nc30) here with a vfr750 engine squashed into it.
If you're keen you can do it.

[Coyote]

Not familiar with ZXR's,but engine swaps can vary from bolt-in changes (like the old gixxer 7-11's) to farkin near impossible,like trying to fit a ZX12 engine to a ZZR 250.

What about a KX500 engine into a AX100 frame?

[Sniper]

Kyle, the answer is NO, don't even think about it.

[T.W.R]

small dimension frames a hard to repower coz of fine tolerances.
ZX9 into ZX7R frames are simple swap ( got pics)
GSX-R 11 into GSX-R 750 simple ( got pics )
RG 500 into RGV250 simple ( pics)
GPZ1000RX into GPZ900 easy ( almost brought 1) nudemetalz mate brought the same bike years after
XR600 into KR-1s simple ( pics )
FZR1000 into YZF750 simple ( pics)

got plenty more engine swaps on file, some hard to get done but worth the effort, others straight forward but why people did it god knows ? example is a Ducati SD900 motor in a 85 mod GSX-R 750 frame mmm odd! and years ago in CHCH there was a Vespa scooter with a CB900 honda engine slung in it !!!! imagine that !

[zeRax]

go away stu!, thx for input guys, so can be simple in some cases but some takes some wicked enthusiasm, cool, wow @ vespa with cb900 engine heh

cheers for link crashharry, em about to check it out, cheers guys, thats the info i was after

[Sniper]

Im sure you will end up with some probs mate. Just be careful.

[T.W.R]

Im sure you will end up with some probs mate. Just be careful.

guaranteed ! the biggest thing you've got ask yourself is it worth it? weigh up the pros & cons & your bound to realise that the expense will out weigh the benefits! the reality of doing such things doesn't just stop at swapping the engine, everything has to be taken into account.
unless you've the finance to create a toy, your better off living with what you've got until you find the bike your really after!

see the attached pics of modded bikes, they haven't been done cheaply & their owners have designed bikes that have purpose, barring the walter mitty GSX-R/ducati which looks just like a dare that went full term!

save your coin till you find the right bike dude!

[N4CR]

I heard certain zxr400 models (john knows this one..) just needed new mounts to drop in to 250's. Reading the manuals for them both the stroke on the two engines is almost the same, just obviously the bore is different. Quite a few things are very similar or the same in specs etc across the board apart from speeds...

I heard it has been done before from multiple people.

[Brian d marge]

Similar or like Engine May drop straight in ,,Such as the 400 to 250 swap ...but UNlike engine the crankshaft balance factor may ( most probably ) will have to be taken into concideration ...Not so much with small engine ito big frame ,,,BSA Bantam D7 with big bore kit ,,,into A Hardly Ableson :bash: as the ableson frame will just absorb any vibrations ,,,,,,But the other way a Rc211 into a FS1E frame will A twist the frame ,,and B Vibrate like a basket ...You get the point ,,,
The Best one I remember was the old NZ motor corp in CHCH ,,the young lads there put a big Donk in an Austin A40 ,,,,,,,,ok around town ,,,planted boot along bealey Ave ......Shankes Pony Home ,,,Twisted Firewall ....

Me I want A CR500 water cooled in an Apprila RS 50 chassis .....:doobey:

With fully adustable 50mm forks


Stephen

[Motu]

In the good old days of the British motorcycle a manufacturer used the same frame across several models,the engine and gearbox being bolted in with plates - so it was easy to fit a completely different engine,even from a different manufacturer....that's where such names as Triton,Tribsa,Norvil etc came from,and the frame makers Rickman called their first bikes Metisse,which means mongrel in French,as they used genes from many breeds.

[ZorsT]

Metisse,which means mongrel in French,as they used genes from many breeds.

Are you sure it wasn't because they ran like dogs?

[Motu]

Maybe your's did,perhaps something to do with your mechanical skills - but mine ran perfectly and handled like dream,still haven't ridden a bike so connected to my brain.

[ZorsT]

just winding you up :blink:

[HenryDorsetCase]

I have a magazine article somewhere on a XT?XL 500 motor into a CB250RS rolling frame. easy enough apparently.

I wonder if an XR650 motor is the same height? that has potential... pity CB250RS are so expensive.

[Motu]

just winding you up :blink:

Sorry,but that's not possible,sadly my spring is broken....but to conpensate I keep everyone else fully wound....

[kro]

Wait until I do the gix up zeRax, and buy that off me instead. Don't pull the ZXR apart, its a good bike as it is.

[NordieBoy]

years ago in CHCH there was a Vespa scooter with a CB900 honda engine slung in it !!!! imagine that !
Another one here...

[NordieBoy]

I have a magazine article somewhere on a XT?XL 500 motor into a CB250RS rolling frame. easy enough apparently.

I wonder if an XR650 motor is the same height? that has potential... pity CB250RS are so expensive.
Early (pre RFVC) XR/XL 500's had basically the same engine mounts as the 250 so not really a problem apart from the extra height of the 500's head.

[DEATH_INC.]

What about a KX500 engine into a AX100 frame?
I'm keen,bring 'em over!