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View Full Version : CRF450 in Z-Frame?



Nahum
10-31-2006, 07:51 AM
Ok, I know that a TRX250-Frame is the best one for this job. I also find here a lot of 400ex conversions.

I just want to know if the CRF engine fits into the LTZ frame?

Will there be enough space for the kick start unit to push it down?

Will all fit where the swingarm, the frame and the enginge come together and things like that?

bansheemorphine
10-31-2006, 08:26 AM
i would think the Z conversion would be easier then the ex because the Z already has a liquid cooled motor but not really sure

figair
10-31-2006, 09:30 AM
I dont know nothing about the z frame,only that they crack like a son of a gun,You will definately have to gusset the hell out of it....

KingpinsEx
10-31-2006, 12:07 PM
Don't see why it wouldnt work, the Z motor is bigger then the 400ex and its already setup for a radiatior. The geometry is very similar to the ex, so you would have to do some customizing but the motor SHOULD fit....

Nahum
10-31-2006, 02:28 PM
Do you know if there is something different between a CRF450 engine years 04 or 05?

Is the 05 better than the 04?

yellowzo3
10-31-2006, 03:07 PM
people were complaining about the valves on one of the years. im not sure though...but with proper maintenence and care you should be fine with any year. the reason people dont do rmz motors in the Z frame is because the kickstart wont clear. so imagine youd run into the same problem with any 450. but with proper <--, yes PROPER modifications (not hacking but a clean job with good welds and doing your neccesary hw) you should be ok.

Nahum
11-01-2006, 01:30 AM
@yellowzo3

What do you mean with "the kickstart wonīt clear"?

Is the rail of the frame right in front of the kickstart? Thatīs the worst case :(

http://rzsunhome.rrze.uni-erlangen.de/~swashabe/rail.jpg

Or can the problem be solved by using a kickstart extension like this guy did? (next picture)

http://rzsunhome.rrze.uni-erlangen.de/~swashabe/bild14.jpg

Maybe I have to remove the heelguard and cut the rear fender a little bit?

yellowzo3
11-01-2006, 08:40 AM
yes i think the frame is in the way...i dont think a kickstart extension would work because the frame is in the way of where the kickstart would have to come through...but im not positive so i could be wrong. hopefully i am wrong because i would also like to put a 450 motor in a Z frame. :p

Nahum
11-01-2006, 08:57 AM
Bad news, if this is really true. You could be right, cause the marked rail of the Z-frame in the picture above is not in that vertical position than that of the 400ex chassis.
I have to know it 100% before I buy a complete CRF dirtbike. Unfortunately I donīt know anyone who can lend me a CRF engine in order to try if the kickstart will fit.

So please, if someone knows it - write me!!!

Nahum
11-02-2006, 06:45 AM
Ok, I canīt accept that the rail of the frame ist just in front of the kickstart and that putting a CRF engine into a Z-frame ist unpossible.

Iīm not a good painter, but could the problem be solved like this ... (picture). What do you think?

I try to cut out a small piece of the rail and weld in a small piece of a pipe so that the kickstart lever would fit through this pipe?

http://rzsunhome.rrze.uni-erlangen.de/~swashabe/kicker.jpg

yellowzo3
11-02-2006, 10:37 AM
hmm...im not sure of the structural integrety of that but im sure theres a way to make it work. but remember, im not even sure if that frame rail is in the way. i heard it was so i figured id point it out. theres quite a bit of room in there for a 450 motor...im sure it can be done. your just going to be on your own since no one has done this yet. i too would love to do it and have researched the same subject, but theres not alot of information on it. it seems as soon as people hear about a piece of the frame being in the way they give up.

Nahum
11-02-2006, 11:05 AM
I have a buddy who put a FZR600 engine in his Banshee. It took almost a year since he had solved all the problems ...

KingpinsEx
11-02-2006, 02:50 PM
Go for it guy's, there always has to be sometime to try it first. Just remeber nothings impossible! or if it dont work out you could always sell the motor to me :p But i wouldnt recommend cutting the frame that way, doesnt look like it would hold up that well espically with a 450 powering it....

Tri-valleyracin
11-03-2006, 01:29 PM
just dont buy a 03 frame cuse there the ones with the problems. all the other ones are ok. pesonaly the 400 motor has alot of potential. i seen a z400 with a quadzilla motor in it and it was sick.

http://www.northcountrysport.com/davezilla.html


this guy made a sick 500

yellowzo3
11-03-2006, 01:35 PM
it doesnt matter if you buy an 03 frame or not because it needs to be modified anyway, and if you put a 450 in a Z frame, your going to have to gusset it no matter what year it is. Even gusseted Z frames break, so its not just the 03 frames. if your going to build a hybrid, you might as well gusset any frame while your doing all that work.

Tri-valleyracin
11-03-2006, 05:00 PM
^ true but the 03 frames are the weakest at the shock mounts and thats is not modded. a gusset kit is ideal for any frame thats stock.

Nahum
11-23-2006, 04:11 AM
I did some "Photoshopping" just for fun. Itīs a animated gif. The engine is changing ...

I used the engine of member "Rootar". If he feels offended I will remove the whole picture. I hope he will not.

http://rzsunhome.rrze.uni-erlangen.de/~swashabe/movin-crf.gif

troutman561
11-23-2006, 11:03 PM
Well if that is proportionally correct it would work...

TampaBoy813
11-27-2006, 04:19 AM
I think its a cool idea for the hybrid...why not just get a CR450x it has E Start....or a WR450F motor with Estart..no need to make room for the kicker.

PS:Nahum Nice .Gif Looks OEM in there

Rootar
11-27-2006, 08:14 AM
Originally posted by troutman561
Well if that is proportionally correct it would work...

i can tell ya right now the problem your going to have is the swingarm bolt lining up, and wiht it like that the kicker will defenitally hit the frame when you try to kick it over, unless you put it out farther then its gonna be hitting your leg......

Nahum
11-27-2006, 11:38 AM
As far as I know the CRF450X Engine has less power than the R engine. But maybe Iīm wrong.

Does someone know something about a power difference?

Quadracer428
11-27-2006, 04:28 PM
hey instead of dumping all that money into a bike that will never be as reliable. Why not just do some major work into that motor and get the HP easier.

Nahum
11-28-2006, 12:44 AM
This is a old picture of my Z.
Iīm riding some Elka suspension, Houser stuff and a Athena 440 Kit, Double Valve Springs, 39er Keihin, Yoshi CDI 11k ...

I just want to do something new ...

As far as I know the kicker of the TRX 450 R year 05 has to be kicked forward. Maybe you could fix the kicker of the CRF Engine the same way ...

Moreover I remember that guy with the quadzilla engine in the Z frame. Obviously he solved the kicker problem or is the quadzilla kicker a kicker that is kicked forward?

440bigborekit
12-02-2006, 07:26 PM
im prety sure zillas are kicked back

Tri-valleyracin
12-03-2006, 08:55 AM
http://www.northcountrysport.com/davezilla.html


this is the zilla

yamahaman300
12-03-2006, 09:31 PM
hey guys about the kickstarter isnt a CRf motor a foreward kick so wouldnt it work?

Tri-valleyracin
12-06-2006, 01:21 PM
the crf is back kick but the trx is foward

Nahum
12-14-2006, 12:55 PM
I visited a buddy of mine today. Heīs working on a new hybrid. I think this is a stupid idea putting a Kawaski GPZ 500 S engine into a Z frame. Nethertheless itīs worth to look at. Hope I can save more money in the near future to buy a CRF dirtbike so that I can start the CRF project finally.

http://rzsunhome.rrze.uni-erlangen.de/~swashabe/gpz1.jpg

http://rzsunhome.rrze.uni-erlangen.de/~swashabe/gpz2.jpg

http://rzsunhome.rrze.uni-erlangen.de/~swashabe/gpz3.jpg

Nahum
12-30-2006, 09:51 AM
GPZ-KFX nearly finished ... Itīs a street-legal atv - not for MX.

http://rzsunhome.rrze.uni-erlangen.de/~swashabe/kfx25.jpg