swapping the fzr 600 engine for a 750 0r 1000.

[truegift67]

Can it be done and how difficult is it? Would it be worth it to do?

[mike94fzr600]

hi and welcome. anything can be done with time. why are you looking to swap and not just sell the 600 for the 1000?

[ghettomedic505]

what up true you got your answer from kid and sweekster hope it helped

[Fartblood]

This never occured to me, but is something that's caught my imagination.

Fitting a different engine would cost less than selling the 6 and adding the cash required to make up to a thou, and would give a smaller and potentially more agile machine. If anyone knows what's involved in this I'd be keen to hear from them.

[mossy1200]

I would have thought a 660 kit in your 600 would give you same performance as 750 with lighter pistons and crank and warm cams and fcrs.
you want to check this before doing 750 anyways as the 750 engine is not that grunty.
If you were going to do conversion the 1000 motor would give you the horses your looking for.
750 would just not be worth the hassle.
You would need to do frame mods and pods would be come necessary.
I would say the 1000 carbs would not fit in frame so the frame would need the inside removed and then braced.
Anything is possible but its not going to be the bolt in project.

[cad600]

For the most part, this has been tried before. With bad results. The 750 is just a de-stroked 1k engine. So physically they are the same size. They are both too wide to fit in between the frame rails of a 600. You would have to cut away a lot of frame and weld in supports to add strength back to the frame and support the engine as the mounts are in different spots. Someone had done this about 2-3 years ago with a 1k engine. The frame cracked in half first trip down the road.

There is another problem with this swap. The FZR600 uses a steel frame that was designed to take the engine. Much past 110hp and the frame will doesn't act nicely.

But, if you are a mack daddy welder, anything can be done.

[Fartblood]

I'm a decent welder, just don't have the kit, though I'd hire or borrow some if I ever went ahead. Done properly I can't see any reason why the steel frame won't cope as the material has a greater ductility than alloy, especially as alloy ages badly in this regard compared to steel - there is the quesion as to how the geometry of the bike will be affected with the extra 9kg of engine, but seeing as I already weight nearly 30kg over that of a typical rider that's not a major issue for me either. No, the frame material itself is neither here nor there.

Indeed, dimensionally the geometry isn't a major issue either, certainly not in terms of stabilty. The Fizzer has a 55 inch wheelbase, compared to the lighter and much more powerful R1 at (typically, dependant on year) 55.7 inches, so there is no reason why it's not sensible in terms of set up and geometry either. Some powerful tat from the 70's and early 80's was perfectly rideable with steel cradle frames and twin shocks, and big bikes of the day sufficed with some truly godawful steel cradles, perimitero or spines (FJ11/1200, GPZ900R etc). No, the material and geemetric dimensions are not an issue - the big considertion is whether the conversion requires so much material removed that the integrity of the frame is badly compromised.

It's a long way ahead for me if I even went for it, but the only question is the standard of design and workmanship that I or another builder can bring to the party. There are several nice 1000/400 conversions out there on even tighter geometry than the 600 (even shorter wheelbase, etc) and they are fine. I've even seen one with my own peepers and the owner recokoned it was quite docile. Aluminium is a bugger to weld compared to steel, so if a dimensionally near identical frame with a harder to manipulate material of the 400 can accommodate it, then the 600 would be perfectly feasible. TBH, it's something I'd be more comfortable tackling than building a 660 engine.