kz750-4 camshaft for low-end torque

I want to change the camshafts in my kz750-4 for some that gives more low end torque. I find that I drive 95% of the time in low rpm and the current camshafts are clearly tuned towards high-end peak power. Are there any camshafts from other "standard" models that might fit or where can I perhaps find aftermarket ones that suits my needs?

I see absolutely no reason to change cams for "more torque" on the 750. What exactly is the intake setup on this bike ?  Carbs, air filter, jetting ? I suspect a decent tune would solve your problems.
 

Peak torque on a 750 four cylinder happens around 5-6K, these motors were not really designed to be lugged. All the aftermarket cams for these motors are ground for less torque and more for high RPM HP.
 

810cc kit would add torque.  

wrote:

I want to change the camshafts in my kz750-4 for some that gives more low end torque. I find that I drive 95% of the time in low rpm and the current camshafts are clearly tuned towards high-end peak power. Are there any camshafts from other "standard" models that might fit or where can I perhaps find aftermarket ones that suits my needs?
 

Define "low rpm."  How low?  ED

All stock cams for these are more or less the same spec with the Gpz and aftermarket cams aimed at higher rpm power.
You can tailor the power to some degree on the stock cams by using slotted cam sprockets and moving the LC timing but for what you require it will probably be more practical to simply alter the final drive gearing with a larger back sprocket.
This will give more bottom end pull at the expense of some top end speed.

I miss a "multi-quote" option to answer all of you lovely people answering. So I will just try to reply with your names instead:

750 R1: It has standard airbox and CV34 carbs. It runs smooth as hell, so there is nothing to be found in jetting. But I have however considered fitting smaller carbs and to be honest the only thing that really makes me hesitate is how well-jetted I have it currently. That being said 30mm carbs or something around that size could perhaps be the solution to more low end grunt.

Injected: No my suspicion would also be that all aftermarket cams would be tuned for the opposite scenario. So it should have been if the bigger 1000cc bikes had milder cams perhaps to make up for the added volume.

Nessim: Very valid point! I have my eyes set on a 810cc kit once I decide to rebuild the engine or it decides for me But of course you are right, that would help low end torque.

650ed: I do not have a tachometer, so I have no real way of saying exactly. But my guess is that it is somewhere from 2500-3000 and up that I want some more grunt. Which is perhaps asking for something another type of engine entirely would be better at. But just asking for suggestions for making what is already a bike I love more suited to my driving style.

zed1015: Adjusting the cams could be a solution, yes. I might have to consult my 4-stroke performance tuning book and look a bit more into that. With regards to the gearing I have actually raised the gearing which makes it a lot more pleasant to ride on highways. So I think I am more in the smaller carb or cam-adjustment camp at the moment.

due the 810 cc bore kit and be done.

If you want more low end torque I would suggest considering your final drive ratio.  For a few dollars you could get a new set of sprockets that would give your more torque around town.

the ZX750 Turbo came stock w 650 camshafts, so maybe you could go that route. not sure if there'd be any benefit.  or get a 750 Twin ha ha.
ps:  the manuals have the specs.  there's a 750 pdf & 81 650 pdf available for comparing the numbers.

I don't think smaller carbs is the right way to go, either use the gearbox as intended, Don't lug around in higher gears at low revs, put on a larger rear sprocket to lower the gearing  for more off the line performance, or just buy a bigger bike. I've owned over 20 different 750cc bikes over 40 years, a lot of old Honda 4's with less power than the Kawasaki, as well as 900's 1100's 1000's and everything in between and never had a problem with low end torque....

wrote:

the ZX750 Turbo came stock w 650 camshafts, so maybe you could go that route. not sure if there'd be any benefit.  or get a 750 Twin ha ha.
ps:  the manuals have the specs.  there's a 750 pdf & 81 650 pdf available for comparing the numbers.

My 82 GPZ had around 18 more HP than a 650, stock...