Is this all i need to get 140hp

I emailed the guys over at kzzone and he replied back pretty quick. But all he said was I need a big valve cylinder head to even come close to that kind of power. So what would be expected from that 1075 kit as far as hp. Is the big valve head aftermarket or is that my head getting re done.

The head would be a factory head like yours that has been modified to accept larger valves.

It depends on what you mean by 1075 kit. The pistons alone might be worth a few horsepower. It really depends on what you have for cams, carbs, porting and exhaust system. Those components need to be carefully chosen to work together. I think about the best you could do in a street motor would be somewhere near 130.

I'd suggest you call Larry Cavanaugh. I think what your talking about wouldn't be that large of a gain in HP ( 140 ? ), but certainly "much, much" better than what you have now.

If you want some serious HP consider a turbo. Take a look at the link below. Notice those folks are pumping out well in excess of 200 Hp on their KZ750 Turbo bikes, so getting 140 HP out of your engine should not be too much to expect.

www.750turbo.com/forum/viewtopic.php?f=9...da3ddb238ae25439bc89

My local bike shop is just finishing up my motor. It had to be done due to second gear missing and no cam chain adjustment was left. I found a race cut trans for $300. I could of had it re-ringed and honed, but decide to bore it and go for the 1075 wiseco piston. My kz1000 has not been ridden in 3 years so carbs needed cleaning and rebuilt. New carb boots $80. Having them do all the work and parts for all new cam chain, rollers etc, gaskets and other misc stuff is suppose to cost me about $2400. I have not seen the bill yet. When I first talk to them about this bike I asked how much to make it a ten second street bike, I explained the issues it had and I was told about $3600-3700. 140 hp is going to cost a lot more than that. Larry C. is the guy I would go to. You will need some head work for sure and a rack of bigger carbs.

We have all been trying to give you sound advise. But you need to share with us a lot more information .
Why 140 HP ? Whats magic about this number ?
Do you want a fun daily driver to do some blasting around town or is it 90 percent race and 10 percent driving to the race ?
Horsepower creates heat . Are you prepared to lose street-ability ?
Most guys are more than pleased with a 4 into 1 header , Good tuneup and stiffer drive gearing . Adding teeth to the rear sprocket or dropping teeth on the front counter shaft sprocket will make the bike super quick out of the hole for drag racing .
Im more than happy to tell you who does good work and where and what to buy to go fast .
But what are you trying to achieve ??? Fun ? Bragging rights ? Dyno shootout numbers
Just want to help you , but need these points cleared up
Dave
Here is what 200 + HP looks like

I have the exact same bike as streetfighter, but at half the horsepower. It will still smoke a lot of harleys!

It's definitely gonna be a street bike only no time on the drag strip. I figured with a 140hp I wouldn't be the last guy in my pack. But I don't want to break the bank either. So I figured about 3k max. I don't really want to deal with turbo's at all. The engine kit that I was talking about was the SSR1075
$1129.93
1075cc piston kit, K410 cams, 
valve spring kit
I seen a lot of guys on the forum running these so I thought it was popular for a reason. It seems like I'm reaching past my expectations and budget

obie83 wrote: It's definitely gonna be a street bike only no time on the drag strip. I figured with a 140hp I wouldn't be the last guy in my pack. But I don't want to break the bank either. So I figured about 3k max. I don't really want to deal with turbo's at all. The engine kit that I was talking about was the SSR1075
$1129.93
1075cc piston kit, K410 cams, 
valve spring kit
I seen a lot of guys on the forum running these so I thought it was popular for a reason. It seems like I'm reaching past my expectations and budget

Ok Now we have a good starting point .
If that is the kit you want , go for it. Plus a valve job while the head is off and apart. .
What carbs do you have ?
What exhaust do you have ?
Are you doing your own labor other than machine work ?
That kit comes with wiseco pistons which are fine , but I prefer MTC Personal choice from experience with both..
10,5 to 1 compression is good for a street bike.
OR
Just do Piston kit and valve springs for now , add header and tune current carbs for now and do this in phases,
I have been tweaking my bike for almost 40 years , so dont be in a rush unless budget is no object
What kind of bikes are you riding with that you are concerned with not being last in the pack ?
Dave ,

It just depends a couple of guys have V Rods, a few Suzuki m90's and some crotch rockets from 600 to 1k. I have never even ridden the kz1000 yet I brought it in pieces and figured I would just build it up instead of putting it together then tearing it back down. I also have a wrecked zx10 that I would be using for wheels forks and what ever else I could use on the kz

I also Would-be doing all the labor myself except for the machining and the carbs are stock.

obie83 wrote: It just depends a couple of guys have V Rods, a few Suzuki m90's and some crotch rockets from 600 to 1k. I have never even ridden the kz1000 yet I brought it in pieces and figured I would just build it up instead of putting it together then tearing it back down. I also have a wrecked zx10 that I would be using for wheels forks and what ever else I could use on the kz

Gimme a break! In that case you can just tune the bike up to stock specs and save $3,000! If you are concerned about keeping up with a Suzuki M90 you can have a beer and relax. The M90 turns the 1/4 mile in 13.1 seconds (if the guy can ride it well) and has a top speed of 118 mph. The STOCK 1980 KZ1000 will run the 1/4 mile in 12.1 seconds with the same rider and has a top speed of 130 mph.

The only thing I would recommend is for you to buy a strong tow rope so you can tow the Sukuzi M90's behind you since that's the only way they will keep up with the KZ1000! Ed