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100 hp KZ650
- mtkawboy
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78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- rstnick
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Rob
CANADA
Need a key for your Kawasaki? PM me
1978 KZ650 C2, 130K kms, Delkevic ex, EI, CVK32, PMC easy clutch, ATK fork brace, steering damper, braced swingarm, 18" Z1R front wheel.
2000 ZRX1100
2011 Ninja 250R
2005 z750s
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- steell
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When you say your getting x amount of HP out of a 650 thats an 810 or 880 it is no longer a 650 so whats the point, like saying my 900 motor thats an 1105 now makes X amount of power
A couple of reasons:
(1) I'm not racing so I don't have to worry about fitting into a class.
(2) Increasing the displacement only increases power by X amount, it's all the other stuff that increases it by X + Y.
(3) It's all about ultimate power out of the smaller 650/750 package for the street.
What's the point of increasing the hp in any KZ motor, no matter what you do it's still an old KZ and will never keep up with the modern stuff.
In my case, it's a hobby, it helps keep me reasonably sane, it's a challenge, and it keeps my mental processes working.
If someone else happens to share my interest in the 650/750 motors, then that's fine, if they don't well that's fine too. Each to his/her own
KD9JUR
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- mtkawboy
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78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- jordan
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KZ810 streetfighter kz/gpz/gsxr
1983 gs1100e
1979 KZ 1000 1428 dragbike project
1974 kawasaki H1 500 sold
1972 Kawasaki s2 350-parted on ebay
1973 Kawasaki s2 350-parted on ebay
1982 kz750(sold)
1978 kz650 hardtail(sold)
1975 honda xl250-sold
1971 yamaha R5-sold
1982 yamaha xs400
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- steell
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I have a jetted & piped 82 GPZ750, so I do share your interest. I have no doubt a built 650 can make 100hp if its an 810.
Yeah, but it's going to take more than an 810 kit to do it
An 810 kit is 807cc (I think), and that's a 69cc increase in displacement. Now, 69cc being just a hair less than 738cc (stock 750 displacement), that's a little less than a 10% increase in displacement, but I'll be generous and call it 10%. A 10% increase in displacement should lead to a 10% increase in torque, and a 10% increase in hp, so that means a 74 hp KZ750E (or a 650 with 750 head/block/cams/carbs) will increase to 81.4 hp, a long way from 100 hp.
Starting with a 83-85 GPz at 85 hp, by adding 10% more you get to 93.5 hp, closer but still not there.
Compression increase will add another 2-3 hp, according to the calculators available on the net, which boosts the KZ750 to (I'll just round off here) 83 hp, and the GPz750 to 95 hp. Getting closer, but still not 100 hp.
Id have to see the numbers on a dyno not a computer to believe a 100hp real 650.
You and me both, but I'll settle for a pic of the dyno printout
Ive had Kawasakis since 73, I know how to fix them and new bikes dont fit old people, If I wanted one Id buy one, but I like the old ones with no water or radiators even if its better.
My first Kawsaki was a 69 A7 Avenger, probably the fastest 350 ever made
I'm not a die hard Kawasaki fan, I've had lots of other bikes, and I like a lot of the new bikes (but I can't see spending the $$$ for new), but through sheer circumstance, most of the bikes I have owned since I returned from the UK in 1975 have been Kawasaki's. There seems to be some kind of mutual attraction force at work.
Im still learning stuff on this forum. My statement did not indicate a dislike for 650s, if it came off that way, I apologize
I don't know about anyone else, but I took it as a "why are you wasting your time and money doing that" thing, so I simply explained my reasons for doing so. I don't expect anyone to think the way I do, and I'm surprised when anyone does
I didn't include the most important (to me) reason, as I doubt it applies to many here.
I'm a nerd/gearhead/dreamer guy that reads "extensively", and I even read things like research papers, Doctoral Thesis, etc, and I have picked up a wealth of ideas on airflow and combustion management techniques over the years. Being your average poor broke individual without access to the big buck projects, I have to try this stuff on my own, and the 650/750 motors are cheap, plentiful, and easy to work on.
I "think" I can get 100 rear wheel hp out of a KZ650/750 motor, using some of the ideas I've picked up over the years, and I'm going to try.
I just have to find out if I'm right, or if I'm full of crap
KD9JUR
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- mtkawboy
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78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- steell
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That's easy, create a new head casting with vertical intake ports and 4 valves per cylinder (titanium valves), custom made cams, all titanium valve gear (buckets/retainers/etc) custom rods that will hand 15k+ rpm, custom lightened pistons, fuel injection with big throttle bodies, and about ten years of development work. Basically recreate a 2008 ZX6/R6/GSX600R motor but in air cooled form, and turn it to 15,000 or so rpm
I think that if you squeezed every dime, you could probably do it for no more than $100,000.00
I'm not going to use carbs, I already have all the EFI stuff, more power and better drivability.
KD9JUR
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- mtkawboy
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78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- steell
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Why didnt I think of that ?????????? :laugh: . Jack up gas cap, drive new 636 or 600 Kaw under, lower gas cap & tighten
Yep!
But the original post that started this thread specified a 650 with 750 cylinder block bored to 810
And 100 hp at the crank is fairly easy with the specified engine combo.
KD9JUR
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- Paling1
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There is also a pic of the 1983 superbike that supposedly made 125 hp (This should definately be a 750, superbike rules wouldn't allow bigger bikes!)
He also has a pic of a 'Tsukigi Zephyr' which made 120 hp, and looks killer!!!
KZ700-A1 (1984)
525 chain conversion; Dyna 2,2 ohm coils; Taylor plugwires; Stainless steel ZR-7 exhaust ; Remus muffler.
Plans: GPZ cams, ported head, 17 inch wheels, EFI....
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- steell
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He says something about 2nd gear wheelies, wish my German was better.
Google translation
Looks like the 83-85 GPz750 head combustion chamber as I posted earlier, and it has not been cut for more compression.
A 55% increase in power is nothing to sneeze at!
KD9JUR
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