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Discussion Starter #1
Hi All,

Just stumbled across this board. Great site. Here are some pics of my kz. Bought it in a box in 90 or 91. This is the second time around with this bike. The first time i altered the plastic and put wider wheels/tires on it.
The current mods consist of adapting 89 gsxr parts onto the kz frame. Basically threw away everything but the frame/motor/gauges/. Fitted rear swingarm/monoshock/rear subframe/rear plastic/seat/rearsets/brakes/forks clipons from the gixxer. Motor is 1075cc with yoshi cams/mikunis/hand made header/can/.

I have about two years of work into it (weekends mostly). I started the teardown in 96 and it was ridable again in 98. Handles pretty well, stops great. Typical two valve motor, lots of torque fun to ride, although it is uncomfortable to ride for more then 200 miles. My buddy has another like it. He used a zx9 as the donor bike. His has a larger motor (1275) bigger wheels,brakes etc.

Funny that cafe racers/diy streetfighters are getting so popular here in the states now. Me and my buddy have been the redheaded step children of many rides. Nice to see people building what they waqnt instead of going to the dealer or paying someone else to do it.


Be good,

--Tim








 

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Discussion Starter #3
Glad you like it

I was shooting for a cross between the cop bike in mad max and the joker
truck in maximum overdrive :) Inspiration comes from the strangest places.....

Tis loud, mean and green.
 

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wilky good looking bike ,and your right about inspiration and when it comes it just hits you "War Horse" Im building is inspired from the Plains American Indian Warriors Horse A midnite Black appolloosa with whitish spots on its flanks,Warrior bare back (hence stripped down cafe racer look) stretched out full speed!Wierd I know ...lol but I like it alot ..Hey its better then lighting firecrackers like in absurd!
 

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it's cool to see people doing the cafe racer/streetfighter hybrid. That kz/gsxr (crazy gixxer - hey that might be a good name for it) is a badass bike.

I have somethein similar I built, it is a kawasaki h1 500cc 2 stroke with fzr600 and 400 suspension, wheels and brakes. I kept it dual shock because I wanted the bike to look like a factory production piece and not too modern. I also helped a friend put a duc 916 front end on a 75 kz900 once. I kinda feel out of the project when I moved but last i saw he had a 250 marchenesi wheel going on the back.

What few people realize is that modern sport bikes are superlight while still being water cooled, and that a good way to lighten up an old aircooled bike and improve it's handeling is to stuff the mill into a newer chassis (or at least use suspension pieces). 2 strokes are the best for this kind of swap because:

1) they are antisocial,

2) they are lighter than comparable 4 strokes because they lack valves and water cooling,

3) there are tons of speed parts for them because almost all of them have cult followings

4) GP bikes were two strokes until 2002 and nothing is more badass than a street GP bike replica

5) did i mention no valves

6) you can get modern hp numbers out of them reliably with porting and pipe tricks. (120 for a pump gas h2 is the top number right now, 80-100 for a pump gas h1, 60-70 for rd's and t500s)

7) power stroke on ever stroke, need I say more?

The best modern light bikes for swapping in these two stroker beasts are:

- Ninja 250

- Fzr400 (also the fz600 and fzr600 but you may want to swap out the steel swingarm)

- Ex500

- Zxr400 (you may have to go to canada for that one, I don't think they sold any here in the US)

- CBR400 (definatly going to have to go to japan for that one)

- basically anything that came with a 150 tire or less stock.
 

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Discussion Starter #6
Geeto67,

Sounds killer! Could you send me a link to some pics of the H1 bike? I have a couple of questions if you don't mind.

What is the H1 bike like on the highway?

Is the power delivery real pipey or can you do flywheel weight and such

Reliability - Are there upgrades that make the kawi doubles and triples run better (plug fouling,surging,jetting,etc)

What kinda of money does it take to get into a fresh motor,carbs,ignition,expansion chambers ?

I have been toying around with a h2 upgrade for this bike for a few years. The main obstacle being lack of information. The current 1075 motor is maybe making 80 hp at the rear wheel. Although by today's standards that is a trivial number it does also make about 65-75 ftlbs under 5k which makes it lots of fun to ride. Lets just say this bike has vulcanized a back tire or two :O

It would sweet to hear (and smell) three cyclinders of two stoke fury on the road though.


--Tim
 

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quote:
Geeto67,

Sounds killer! Could you send me a link to some pics of the H1 bike? I have a couple of questions if you don't mind.

What is the H1 bike like on the highway?

Is the power delivery real pipey or can you do flywheel weight and such

Reliability - Are there upgrades that make the kawi doubles and triples run better (plug fouling,surging,jetting,etc)

What kinda of money does it take to get into a fresh motor,carbs,ignition,expansion chambers ?

I have been toying around with a h2 upgrade for this bike for a few years. The main obstacle being lack of information. The current 1075 motor is maybe making 80 hp at the rear wheel. Although by today's standards that is a trivial number it does also make about 65-75 ftlbs under 5k which makes it lots of fun to ride. Lets just say this bike has vulcanized a back tire or two :O

It would sweet to hear (and smell) three cyclinders of two stoke fury on the road though.


--Tim
Hey Tim,

I'll send you some pics when I get home from work. I haven't ridden the bike since I put the fzr400 rear swingarm and wheel, because I need to weld some rearsets on and decided to swap in an h2 motor. I also needed to fab custom chambers to work with the swingarm (in the process of doing right now).

The h1 was a running bike when I started and it was very docile on the highway because it is a 1974 (one of the detuned h1s). I don't think kawasaki got the sprockets right on the later h1s so I might go to a smaller rear, bigger front as in town crusing I found myself bouncing back and forth between 2nd and 3rd.

The later h1's are only midly pipey, they are not the smooth pull like the t500, but right around 3K-3500 they come on and blast off. When I switch to chambers the powerband will get more pronounced. The early H1's are really "pipey" and less refined. Same goes for the h2, the 72-73 is a monster, the 74-75 is a little more livable.

I did however ride the bike with the fzr600 front end on it for a while and it makes a world of difference from the stock setup. The bike handled better turn in was quicker, and the whole front was lighter but more stable (and yes I did hook up the stock steering dampner). The ideal setup for a triple frame is 18" wheels anyway, not the 19 inchers it came with. I had the rear set up similar to what I am doing now but with a one inch lift in the rear.

As far as reliability, h-series triples are farily reliable. The early ones had real problems with their electronics to the point where kawasaki switched back to points for one year. The 1973 h1 is the best h1 electrics because it uses the h2 system. Teh h2 electrics are rock solid. The only reason these bikes foul plugs is if they are not kept in tune and are allowed to run rich (or someone tries to run them premix). The oil pump does a great job of injecting the oil where you need, just keep the carbs tuned and you are good to go. Lectrons seem to be the big upgrade for carb reliabilty. The surging issues are usually caused by the bike's vibration rattling something loose like the carbs or the manifolds. The h2's shake a lot so something is always coming lose. There is a rubbermount mod out there but it requires later cases and some machining. A triple will never be honda reliable but it will be fast and fun. Considering that h2s are the fastest 750cc drag bikes there is a host of speed parts that make the bike super bullet proof and super quick, it just depends on what you want to spend...which brings us to the next answer.

As far as cost to get into an h2 motor, it all depends. The cheapest way to to find a local who doesn't have a computer and offer him $1 per cc for it. Ebay has made h2 stuff rediculous but there are some reasonable people out there. I just paid $500 for a 1974 h2 motor that is ready to go in the bike carbs to wiring. It is not a fresh motor, but so long as the crank seals are good I am good to go. Expect to pay in the neighborhood of $300-500 for a core engine. If you need a crank rebuild Damon Kirkland in Alabama is the crank god but it will cost you about $350 for a full rebuild, but if you go that route you wll pay extra for labrynth seals (last 10 times longer). You can get reed conversions for the cylinders from Darren Abrams in upstate NY that make stupid power, but pe prepared to spend. Darren also does porting as does Maddog down in texas. You can find all these guys on the kawasaki triples board - www.kawasakitriplesworldwide.com . Tomcat the site admin makes a killer set of chambers but at $700 a set it's a major investment (they are the best chambers available). Ebay dencos run about $200 and pro-flo was recently wholesaling their pipes for $250 or something like that. H1's are decidedly cheaper than the 750s but you won't make the power the 750 does. The main advantage of the 500 and 750 over you existing mill is you will match you existing hp with a lot less weight. Torque may be a little lacking though.

the kawasaki triple message board at www.kawasakitriplesworldwide.com will hook you up with all the info you need. Some of the old factory kawi drag racers are actually on the board and chime in from time to time (like Tony Nicosia).

Considering your kz is using the stock frame I would advise against swapping into the existing chassis you have because it is a lot of work (h2s are not a bolt in to the kz frame desptie the fact that the bikes share suspension pieces), your stock kz frame is heavy, and there are better frames, like the 1989-1996 fzr600s or the 1988-1990 fzr400s. If you are close to NY you are welcome to stop by and check out what I have. I should have my stretfighter and my drag h1 back and roadworthy by christmas.

my e-mail is [email protected] drop me an e-mail and i'll send you some pics.
 

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Geetoo,

Thanks for all the info. I will check it out

I sent you my email address. Looking forward to seeing the pics. i live in CT so let me know when you get the stable back together. I would love to come see your bikes. Maybe me and my bud could even ride the kz's over in the spring.

took a few pics outside today:





 

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I just love the way that bike looks, very well built. Z1s an KZs are one of my favorite bikes that I have never owned. I have ridden a z1r and kz900 for extended periods of time and they both impressed me with their powerband (and nice flat torque curve) but seemed like heavy bikes when plowing through a corner, with those mods the bike must handle like a dream. 80 rwhp is a lot for any aircooled 4 stroke from the 70's, are you using a shaftie crank in there (old drag racers told me about that trick)?

What are your physical dimensions? Seems like a weird question I know, but here me out. If you are thinking of going the triple route the h bikes are big heavy bikes. The s3 400 on the other hand is the best handleing triple with a power to weight ratio somewhere between the h1 and h2 depending on the rider. I have seen a stock s3 smoke cb750s, kz900s, and h1s. The problem with an s3 if you are like me, 6'5", is that it is a smaller bike. The ultimate setup for the s3 is to stuff an h1 or h2 motor in the frame. For some reason the s3 is tons lighter than the h-series bikes and can really rip along with h-series power. My friend Jeff in Penn has an h1 in a s3 and that bike flat out rips along like nobody's biz. the best part is that an s3 is usually 1/2 the price of an h-series, the down side is if you need pistons they are rare as hens teeth (all the more reason for an h-bike conversion).

here is a link for what it takes to put an h-engine in an s-frame:

http://kawtriple.com/mraxl/khconv/400to500.htm


by the way this is an awsome resource site:

http://kawtriple.com/mraxl/
 

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Discussion Starter #10
Nothing too fancy with the engine. I'm guessing with the butt dyno on the actual hp. My bud did get his bike on the dyno and he did 98 rwhp with about 90 ftlbs with bigger everything

I'm about 5 11 and weigh about 205. I don't know how different the s3 is
ergo wise. Sounds cool.

If i did start a new bike i would have to come up with a new look. I really like some of the repla-racers with the old bubble fairings. It would have to be something different. I really like the under seat exhaust exits on the 80's gp bikes. hmmmm...

Need to digest all the info you've given me. Thank you very much
 

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wilky Im also a huge fan of the bubble fairing and old school cafe racer full fairings .And Im looking forward to putting them on something I have ...its just but Im having so much fun trying to make them stripped down looking to the max.I havent got to the full fairing yet .But on the street I think it has that "Sin City" look to it ..ahh Man !! I do have to get a vintage full fairing for one of the bikes Im building....I want that "Sin City " look!
 

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Lil Bull,

dude, i dug around and found your site with the bikes you built. Excellant crafsmanship. I dig those tanks you made especially.

I really need to give most of the credit for my bike to my friend adrien. He was the one that suggested we build streetfighters. He also provided the tools and garage. He taught me how to weld and pushed me to build the best bike that i could. Would have never stuck with it for two years without him kicking me in the ass. He is going to email me some pictures of his bike which i will post to the board. His bike is pure evil. You'll love it

Maybe you, me, adrien, geetoo and whoever else lives in the east coast need to have a little get together this spring. Could only imagine the look on people's face as a bunch of these monsters came rolling down the road

--Tim
 

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hey JD put this site up for that reason caferacers to get together share ideas, resources and good times. Most of the guys that dont say much here are racers or race builders, me Ive raced vintage sports cars. As for bikes I like the street caferacer ,no build rules, is the best part, and I can get on it when I want, the other good part.

Ill still watch them run up at the tracks,sometimes from the seat of my bike when I can get a good view!!And ride home after a nice afternoon watching them thru the "S" and out down the straights.

George
 

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speaking of triples by the way. They are kinda rare in our area. This came up for sale recenly. I am friends with the seller and I know he is in dire straights. take a look see if it is something you wanna do, I'd normally be all over this but I can;t come up with the dos necessary to buy him out. Aritech sells a full repliracer green meanie kit for these bikes (tank, old school green meanie bubble fairing, and hansen seat). I have always wanted to build a street going replica of a 1970's gp bike (you can't do an accurate h1r replica because the frames are different but then again, how many people will notice).

http://kawasakitriplesworldwide.com/phpBB2/viewtopic.php?t=18329

http://www.airtech-streamlining.com/kawiz/kh2r.htm

http://kawasakitriplesworldwide.com/phpBB2/viewtopic.php?t=6998&highlight=racing+pictures
 
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