power increases?

hey all im just working on my KZ750H2 and i was just doing a rebuild over the winter and was wondering if anyone knew the approximate power increase you would get with some parts.

this year iv put on
- V&H exhaust
- Dyno-jet stage 3
- pod-filters (generic not-k&n)
- dyna coils 2.2ohm (grey)
- 530 chain/sprockets

so i guessing with all those parts i was maybe looking at about 95-110 hp? or like 30% increase? or am i way off, i havent riden the bike yet this year so ill know how it "feels" when i hit the road,

i know its pretty much impossible to tell my personal increase because i know it all depends on tune/compression/chain ratios/ etc.

thanks for all your help

also if anyone has done much boring on these 750's how far would you go/can you go? 20 over?

thanks again
-john

Way off. I doubt you have increased the hp much at all; you may have actually reduced it depending on the luck you had with the jetting. Your best bet is to put it on a dyno and measure it. Stock was 74hp. Here's some info (see link below) you may find interesting regarding pods on CV carbs on stock engines. I suspect current jetting kits make jetting easier, but that doesn't mean they do much for adding hp unless changes were made to the cylinder head, bore, cams, etc. Ed

kzrider.com/forum/3-carburetor/585949-po...-a-free-lunch#585949

WOW, where did you get the horsepower number? 95 to 110 HP is way out off the mark. I'm with 650ed on this you probably will not gain any or loose depending on how good you are jetting. You might get 75 or 77 HP at the upper end of the RPM range and that would be assuming your engine is in really tight condition, but you will sacrifice bottom end torque with the 4 into 1 pipe.

I think even the newer ZR750 air cooled models only have about 75 hp.
There is a Wiseco 810 kit available for the KZ750 -- retail is about $595 + boring n stuff.

With de 810 Wiseco big bire kit... how many HP increase can someone expect?

The mathematical ratio is about 10% greater (810/738), so probably not much more than that.... maybe an increase of 10 hp? To get more you have to do other stuff... camshafts, porting, carburetors. I don't know much about it - it's just stuff I've read. KZR - wiseco 810cc kit?

Comparing the 750 & 650 --- ccs & hp: 738/652 = 1.13 & 74/62 = 1.19

I recall compression rises up to 10.25 with the 810... so may be a little extra ponnies there.

martin_csr wrote: I think even the newer ZR750 air cooled models only have about 75 hp.
There is a Wiseco 810 kit available for the KZ750 -- retail is about $595 + boring n stuff.

What martin_csr says!!
"No replacement for displacement"....Learned that over 40 years ago when I was Drag Racing and for the most part....is a standard thought.Just means for the $$$ spent....You'll get more "HP" , its much easier and wiser to increase displacement Plus as 650ed says, tune may actually be worse with the set up you have. :whistle:
Please dont shoot the messenger..,(s)...just saying...810 kit sounds very smart to me! :woohoo:
Regards
TennesseeZ.

ya no kidding i just figured the new pipes would give better flow. but yeah i was hoping to be able to bore it this next winter, i wish i had the stock parts, the old exhaust was not worth salvaging and the carbs already had pods when i got it, plus the wiring was shot so iv had to do it all overagain, (looks like prev owner tried to tackle it and failed).


OH HEY has anyone installed the carb kits? i just poped the carbs apart yesterday and noticed that my needles dont have clips? this is new to me lol should i just go get a clip and some washers and install the new needles or is this the wrong kit??? the needle thats in it kinda looks like a nail hahhhaha (thin tapered with a head)

thanks again eh
-john

Does your bike have the stock carbs?

In that topic I linked, you might want to focus on the reply by Larry C. (larrycavan). I think he's from Cavanaugh Racing .

What you have done will increase the performance somewhat over pure stock but it's not going to be to the tune of 30HP. Maybe a hand full in the upper RPM range if it's jetted spot on. The pipe is lighter than the stock system so that helps acceleration.

Some bolt in 83 GPz cams would be a nice addition. The thing you have to watch with 750's and cams is that Kawasaki played with base circle sizes on the 750 models. I can't tell you the exact sizes off the top of my head but probably one of the more avid 750 guys would perhaps have those specs.

In a nutshell, what that means is valve work might be required when cams are swapped from one 750 model to the next.

Next step is the 810cc piston kit. In combination with the other bolt on / drop in mods, the bike's performance is boosted pretty well over stock. For a really noticable difference, it take the full combination to make a remarkable mid size bike....

Horsepower isn't a simple thing on these bikes. What worked on the old Chevy's doesn't necessarily work on these, because on those old cars they had ports like plumbing elbows, compression designed for knock-o-special gas, and cams favoring low end torque.
to extract real power from your bike, lumpier cams, plus the 810 kit with compression increase is your best power-adder, but expect to move to the premium pump. Also modifying the backer plate behind the magnetic pickup coil to get a few more degrees of timing is helpful. I remember a period build, when the magazines took a stock KZ550, put on the pipe, pods, and jetting, and promptly lost 2 hp on the dyno, but helped the 1/4 mile ET because of weight reduction. When they put in the Champion Moriwaki cams and 610cc pistons, they got a massive increase - 63 hp on the dyno fron 44hp.

Here's a copy of the original dyno-test on this bike, kind of shows you the powerband -