maxim 750x big bore --- fzr1000 motor

Doing some research it looks like the fzr1000 cylinder block, pistons, rods and crank may work to make a shaft driven 1000 maxim x.

 

I'd like to see that. Will the fzr motor fit in a Maxim frame?

 

If you do that job, post LOTS of pics?

 

He said nothing about moving the transmission or crankcase over, so holes lining up wouldn't be an issue.

I agree, this would be interesting to see, but a few questions come to mind. Can the existing carbs feed the larger volume? What about the heads? Is the bore the same size, or are they larger?

 

I have done a little research on this also and it's next years project.
From my understanding the centerlines match up.
An XJ900 crank will fit the cases (to give you the stroke)
The fazer cylinders/pistons are a go per Len.
What connecting rods? dont know that one

The head became the question mark. I would THINK if the jugs went on, the head could come with for the ride (and what a ride it would be)

Tuning....now there's the delimna! I didn't get that far yet.

Probably should think about keeping it cool?
You could just go nuts and put a turbo on it and EFI unit!!
And then buy tires by the dozen.

I believe the Fazer motor is tilted forward about 30 degrees more so very doubtful it would fit the frame.

 

Hence the problem, and my question. You know as well as I why the X uses the carbs that it does, and not the set that came with the FZ/FZR.

A quick google and a side trip over to the Maxim-X site tells me that the heads won't match up -- a 1987 FZR1000 has a 75mm bore, vs 68 for the X.

 

I would imagine that the cylinder package will bolt on.
Is there a fazer 1000?

The problem with the head is that the ports themselves are angled along with the angeled intake boots. so you wouldnt be able to use the head.

I was thinking you would keep the stock head, but the bore is going to be allot bigger. Which means the 1000 head bore is probably alot bigger also.

So maybe this will not work after all.
Never thought of using a xj900 crank, maybe the fzr 1000 crank will work?? or be adapted to work.

My ideal thoughts would be maxim head, fzr 1000 crank, rods, and pistons.

And yes i would like to go efi and turbo on this thing also!

 

hope someone figures it out i would like to build my x is there anything that will work rod piston wise by switching to the 900 crank if so what size would it be

 

looks like the only thing that would work is the fzr 1000 head, but using custom carb boots to get the carbs back in line.

bummer.

 

i enjoy threads like this. where is the "keep it stock comunists"? i figured there would be a "you can't do it" post by now.....

on a single cylinder race machine we tig'd a short aluminum pipe over the intake port and angled it to our liking so we could accomodate a different carb. we smoothed it out with porting tools and it was better than the factory boot. just a thought.

 

So if the Maxim head fits the FZR block, then all you need to do is relieve the head to get an acceptable compression ratio.

IF the Maxim head fits on the FZR block that is.....

 

Isn't that a nautical term?

 

I took a look at a spare head I have, and it would be a CLOSE call whether there is enough sealing surface to accomodate the larger bore.

7mm in diameter is not really very much. (a touch over 1/4")
SO, we can assume (That's dangerous)..that if the jugs match the bolt pattern, the head has to bolt up.
Question remains if the bolts are long enough. AND would the head designed for 750cc of air flow restrict a 1000 cc engine flow significantly. The 5 valve genesis head is very streamlined compared to others, but would be hard to test.
Bolts are somewhat easy to change though.

Now, WHO bought the cylinder/pistons off Ebay on me??

 

I would assume the 750 head would have smaller valves than the 1000 - all the better for making low-mid range torque as opposed to top end power :wink:

 

the smaller carbs/head would run the big bore stroker with no issues, the power curve just might fall off in the higher rpms. if you are doing all this custom work.....maybe try to get a nice set of FCR's for it? or just one holly 4bbl

 

i like the idea of using the fzr head, cyl, and pistons.

i also think machining the fzr head ports to be straight and then welding on a aluminum tube is also the way to go.

will the fzr crank fit in the maxim block though? seca 900 cranks are pretty rare im guessing.
then you could use the whole setup. rods, pistons, crank, cyl and head.