Kwikasfaki GSX-R400 Kawasaki H2 750 Custom

Kwikasfaki GSX-R400 Kawasaki H2 750 custom

Kwikasfaki GSX-R400 Kawasaki H2 750 custom

A couple of comments on the Kawazuki post pointed out another Suzuki frame with a 2 stroke transplant, and after a quick look at the photos, this one, "Kwikasfaki," is simply a lesson in how to do it right. The entire build is documented in a very long (60 page) thread on the Custom Fighters forum with lots of in progress pictures.

Kwikasfaki GSX-R400 Kawasaki H2 750 custom

Kwikasfaki GSX-R400 Kawasaki H2 750 custom

The major pieces are a GSX-R400 gk76a frame, GSX-R upside down forks, an R6 swing arm and a Kawasaki ex-drag bike H2 750 triple engine. The wheels are brand new Dymags that he found on eBay with the tires. Very nice.

Kwikasfaki GSX-R400 Kawasaki H2 750 custom

Kwikasfaki GSX-R400 Kawasaki H2 750 custom

If you want all of the details I suggest you start going through the build thread, but the bottom line is this is a really superb project. Excellent work!

Thanks to Justin and Talon for the pointer to this bike.

Link: Custom Fighters Kwikasfaki build thread

Kwikasfaki GSX-R400 Kawasaki H2 750 custom

Kwikasfaki GSX-R400 Kawasaki H2 750 custom


    • Nicolas says

      you can ride soooo much more agressively with flat bars. Unless you’re a moto GP racer, or a poser.

      • says

        No Nicolas, wide bars make hooliganing aggressively easier. Clip-ons are much much better for body position and finesse. You should try them some time.

        • Nicolas says

          Dear Seth, I tried and tried and still ride both ๐Ÿ˜‰ On a racetrack you want to have clip ons to improve your aerodynamism in the straights and be able to slide your knee in the curves, but in a real life wide bars are a way better to flick the bike in the twisties (or to avoid traffic ๐Ÿ˜‰ )

          • says

            Ahh, your second response is much more intelligent sounding. This is an occasion of “to each his own”. Each physique is different, and we can train ourselves to appreciate handle bar positions of many proportions. I do like the “in my lap” controls on my DT50 and my kitted Stella, but definitely prefer the fairings and low bars of my gray CBR400R for sport riding and long rides. At 30 my wrists are strong enough to give my back relief.

  1. Carlos says

    I like it! But where am I supposed to sit. (In the interest of full disclosure I am female) But it looks like fun!

      • Carlos says

        I could just see me trying to reach over that gas tank, seems like I would have to contort myself. I am not that tall it would be a stretch, might affect my ability to control it. But hey I’d try it.

  2. B50 Jim says

    I went through the entire build thread (slow day in the office) — and it’s an incredible, meticulous, well-engineered build. Also hideously expensive, but this level of craftsmanship costs tons. I’d love to hear it run!

    It’s the direct opposite of the earlier Kawi – Suzy transplant — every part custom fabricated, CNC machined, painstakingly assembled. Two different approaches to the same project. Which one is better? Both! One was done using stuff laying around on a tight budget, the other with money as no object. Either bike would be a hoot to ride, although this one’s performance has to be breathtaking.

  3. akaaccount says

    Cool oil tank in the tail, but do people really run high performance 2 strokes like this without premixing? Yeeesh. Yeah, the pumps are supposed to work fine but after having lost one RD engine to a lube failure I can’t see going back.

    • Pat McSwain says

      IIRC, the H series Kaws had oil feed to the crank bearings. If you remove the injection pump, the main bearings fail. Loctite or safety wire EVERYthing on an H1 or H2, especially the injection pump.

  4. Steve says

    Looks to me like those bars are angled up a la dirtbike., as in on the pegs, front wheel skyward…?

  5. B*A*M*F says

    What an awesome bike. Did we get the GSX-R 400 in the US? Stock it’s apparently a 59hp bike weighing around 335lb. This looks stripped much lighter and I can’t see a drag prepped version of the Kawa 750 being somehow less potent than that. I’m sure it’s a looney machine.

    The white frame looks so sharp and clean.

    • todd says

      from what I can remember we got the Bandit 400 instead. We were fortunate enough to get the FZR-400 and the CB1 (400) though. All well sought after bikes now.


  6. Rob says

    I remember seeing quite a few GSX transplants back in the days. Everything from a GSX400 engine in a 250 frame, 750 into 600 frame, through to the inevitable 1100 into a 750 frame (good for wheel stands it was explained to me). Good run on triples there Kneeslider. Any a big bore turbo Laverdas out there…

  7. D Man says

    This is a nice piece of engineering, style and retro. What the Crossbreed could have been. Well done!

  8. Des says


    My dream would be to be a talented bike builder with an eye for beauty and the ability to create it. I’m starting a build soon and all I can do is hope that some of this persons magic rubs off on me.

  9. B50 Jim says

    Shows you what an Englishman can do with lots of money and time on his hands. The more I look at this build, the more impressed I am. I agree that it would look better with clip-ons, but for all its sophistication, it’s meant to be a practical ride — note how much trouble he went to with the resilient engine mounts; so the high bars will provide leverage and a comfortable riding position. Mighty fine work!

    I want to hear it run!

  10. B50 Jim says

    Question regarding 2-strokes:

    I’ve never liked the way a bike’s visuals are messed up with all those chambers — is there any way to combine the exhaust in a 3-into-1 with internal chambers or a single tuned chamber? Just to get rid of the clutter. Or would that present too much of an engineering challenge?

    • Paulinator says

      Hmm? You see that on 2 cylinder snowmobiles. I don’t know if its the utmost efficient, but it fits under the hood. In fact, why can’t the chamber be shortened so that the reflected pressure-wave from one cylinder charges one of it’s running mates? In this case the wave has to hit another cylinder 120 degrees out onstead of 360 degress.

    • BigPeeWee says

      3-1 makes more torque usually if combined with proper porting. High-end porting, low-end pipes makes for no power anywhere. Recreational Sleds need lots of low end, so 3-1 pipes are ok. Racing sleds have 3 pipes under the hood. Imagine 3 sets of exhaust waves going different directions crashing into each other in the same chamber. That would be much counterproductive! If all 3 pistons went up and down together, it would work, chamber wise, but it would self destruct in short order.

      Well designed pipes look very good. This bike looks very good. If I would change anything, it would be to tuck the pipes under the bike more so they don’t get ground off on the road.

  11. Gary says

    I think the bars are up higher so you have time to react when that triple clamp leaps at your face ala Alien.

  12. Hooligan says

    As his forum name is “Cabbie” I would suggest he is a London taxi driver.
    But it is amazing what you can do with MDF to prototype things for machining.

  13. B50 Jim says

    It’s just my personal preference to like less exhaust clutter. I knew each cylinder needs its own chamber for max output — I just wondered if there were another way, but if there were, I suppose someone would be doing it.

    Regarding these pipes, are they fabbed from titanium? They look welded up from short segments; days of work. Whoever fabbed them sure has a good touch.

  14. joe says

    Nice creation mixing and matching different brands.Something thats getting hard to do with modern bikes because of all the complex electronics and cooling system plumbing.

  15. OMMAG says

    I think this is one of the cleanest builds I’ve ver seen …. the word meticulous certainly seems appropriate.

  16. hades says

    Funny how tastes vary – I was just ogling a an RD250 the other day and though to myself how cool the custom, multi-segment chambers looked. Ditto on this bike.

  17. AJ says

    to the dude who owns that bike:
    You’ve got a triple, that’s a two stroke, that’s 750cc, its air cooled and kick start. Its also a proper naked, sit up, wide bars, no gauge cluster, no kick stand. Machined upper and lower triples…color scheme flows, it screams. “I built it in my garage from scratch”. Its a man’s bike for MEN!
    Goes on my list as one of the the most sick, cool, rad, bad bike ever. haha..good job.

  18. mpkoontz says

    Well it’s a good start I guess-

    Needs an air cleaner and lights to be a road bike.

    And since when do we need a 40″ inseam to fit on bikes anymore? I guess I’m waiting for the styles to change again…..

  19. steve says

    absolutely stunning! obvious to say KH750 engines rare and expensive – any ideas what other engines would fit in the same frame/rolling chassis if I try and copy the concept?

  20. fernominal says

    Great ride!! love the name! (used to be a H2 owner, back in the day!) ( I think this cycle has started me on a midlife crisis! cause I’d like to ride it, own it, and do some wheelies/burnouts on it!)