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Discussion ZXR250A Vs ZXR250C

Discussion in 'Kawasaki 250cc In-line 4's' started by Frankster, Feb 6, 2014.

  1. risky

    risky risky

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    rear wheel powered rollers to save clutch start.MATE, IF YOUR WORRIED ABOUT BLOWING A MOTOR FORGET DRAG RACING.drag racing is about pushing to the limit.many a time in the 60,s i broke crankshafts and you can rebuild quickly after the same thing happens. grey holden motors were never built for 7000 rpm but the cranks always broke behind number 6 conrod.drag racing is the get to the end the quickest even if your motor is going to blow as you cross the line.withers out of melbourne in a AA fueler raced with a cracked block against his pit crew,s advice and the competitors would not run along side him.the pit crew wanted to salvage but being competitive he ran and the motor blew.by the way the newcastle boys took out middle eliminator at the 70,s nationals at surfers.6 cylinder holden rail against the v8,s.
     
  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Funny spinning thing .....

    Bike starter.jpg

    Or better still ... the twin model

    jumpstart.jpg
     
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  3. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Thanks Kerz.

    No, I meant the thing under the rear wheel as used mostly in circuit racing.
     

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  4. risky

    risky risky

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    grey, which is your preferred model?
     
  5. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Risky, motors blow in all forms of motor sport. I just don't see the point in deliberately increasing the chances of blowing an engine for no gain in performance. I'm not racing for sheep stations I'm racing for fun. If I recall, the Wilson brothers used to run high nines with their fuel injected 6-cylinder holden-powered altered. Don't remember them ever blowing it up too often, but I do remember them winning lots. Since you've been around drag racing for many years, you'd know most blowups are from poor tuning or parts failure. What Graham Withers did is on him and good luck to him. I've seen plenty of 4-wheel guys keep the foot in when things are going to poop behind (or in front of) them...but motorbike riders button off as soon as there's an issue.

    What did you run?
     
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  6. Kerz

    Kerz Beginner level grinder :)

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    AH, nice. That remote starter would save ya some weight. As for the twin model, it appears as though it's got what it takes to start my engine ;)
     
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  7. risky

    risky risky

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    kerz, i reckon that is the model most of us would choose.lol. hanging, an fj holden.was on the pit crew of wee beastie...149 taken out to 227 that jim read had previously run for parramatta spares. lots more work had been done on it.where is it now?who knows.a friend did a sidevalve ford rail and when it was sold the motor went in a speed boat and the rail was gas axed.
     
  8. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Jees, 149 to 227ci and in a humpy. The good old days...6-cylinder FED. Jim Read, Warren Armour and all the boys. Be great to find the FJ and run Nostalgia. 227ci...there wouldn't have been much meat between those bores.

    Cheers
     
  9. risky

    risky risky

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    nah the humpy had 1/8 overbore. the red motor was in the rail. warren was a nice bloke, ash was good, keith williams threw wild parties.ready was called shanks and he called me greenbottle.the fj is in the shed where i parked it in 71.was wild on the street and often did a nite run from parkes to taree at some insane speeds. blew the motor on way to surfers once and reedy gave me a lift to taree to get a trailer in an ex london to sydney monaro. was still fitted with the police sirens for going through the countries on the way. could tell you some stories from then but discretion reigns.at the time i had a yank ladyfriend from west virginia.bet she has sagged by now.lol.

    to get a 227 you use falcon 3.6 pistons and rods and a welded and machined crank. the original 149/179 cranks came from canada and were high grade steel not cast iron. that came with the 186 series motors.the head was so hogged out that bog was used to fill the watewr jackets where the grinder went through.
     
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  10. risky

    risky risky

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    forgot to add...still have a HP motor which was the original 179 and grey holden motor pieces liuke 1/4 inch over pitons on balanced rods. wish i could pick up a repco head and dizzie.loved the humpy.could pull 100 plus 20 in top gear on a straight road. no brakes, no handling and when young ..no brains.
     
  11. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Great story Risky. I was wondering how you got it to 227ci. I grew up in Stanthorpe (QLD country) and a few of the boys raced humpys (and EH Holdens) at the local track (Carnell Raceway). Usual spec, 186, 60thou over, triple stroms or webbers, Yella Terra (or 161) head and straight through exhaust. Fun days.

    Let me know if you ever decide to wheel the old girl out of the shed. Not too far from Newcastle to WSID.

    What CB750 do you have? Are you a members of the CB750 Owners Club?
     
  12. risky

    risky risky

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    honda cb750 1992 is a f2n.retro model which was sold with rear drum brake but disc here as a nighthawk. [grey paint]. not member of any bike club but love the old honda for cruising.got the 89 fzr to do up and an 88 kwacka600.in the shed is a 62 ca honda 305cc machine i need to strip and paint. motivation is the key.with the 227 you need to grind the block where the big end rods can hit, grind off the excess conrod bolt and machine the cam lobes narrower to clear the crank rod swing.if you run a radical cam like 50/90 a 40/80 will give more torque and power at 6500 rpm and last longer.basically we dropped the sump after every meeting to check rod bearings and replaced them once a year. the machine pulled a 9.99 at calder but normally 10.3,s.at surfers we deliberately stalled on the run up and did a few swear words to psyche the opposition and had a good run.surfers was always fun.winning was better.
     
  13. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Ahh, the games that were played.
     
  14. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Beautiful. Sounds like Tommy Ivo pouring oil into a header to make Garlits think he had a dead piston in a final!

    I had a 1987 CBX750F (RC17). See below.

    You seem like an interesting fellow Risky. I marvel at the mechanical prowess that people like you have. Something for me to aspire to.

    Cheers

    Frank

    CBX750F Pic2.jpg
     
  15. risky

    risky risky

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    would love a straight 6 honda.
     
  16. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Yep, me too.
     
  17. ajverma

    ajverma Active Member Premium Member

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    Hi Frank,

    More than happy to help, just let me know how you go, I'm watching this thread :)

    You might not need the stator coil if you are happy to bump start the bike for drag runs, might be better off purchasing a trickle charger. A lithium battery will not take kindly to being depleted though so beware, if you drain it to empty, it's finished. The user manuals will usually have a minimum voltage from the battery, so this will be your guide. I wouldn't be able to tell you the consumption without all electrics, that's something you'd have to test.

    Getting rid of the starter motor will not cause any problems, just follow the usual process as with any bike of removing the starter motor, as far as I'm aware there are no trick circuits to the starter motor.

    Not stupid questions at all, I'm 100% sure I've asked dumber questions than that! Ask as many as you need, I just want to see what you can pull off with this 250! I'm an engineering student and really wanted to do drags but don't have the contingency funds necessary to drag a bike regularly, so giving my knowledge to you is helping me as well.

    If you want to shave weight, remove the fairings, cover them in glad wrap (on the outside) and go buy 5m of fibreglass, resin and black gelcoat. Lay the fibreglass over the fairings, saturate the 'glass in resin and come back and do another layer. Leave it overnight to cure.

    Doing this will save you 2-3kg, and cover up your aero drag holes (headlights, etc)

    Also, remove all the major brackets and remake simplified versions with sheet ally, easy and cheap. Also remove all major electronics, get rid of the under fender and all its contents, you can also move the rec/reg and get rid of the 700g plate it sits on under the tank. You should be able to see the minor things after this!

    Purchase a 20hp Nitrous kit from ebay for mega fun!

    Cheers,

    Aj
     
  18. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Hey AJ,

    I haven't had a chance to do squat since my last post. Bloody work!

    Thanks for the tip on the fairings. I am keen to get the engine running right and then address the weight issue. The best thing I could do for the bike is lose 20kg myself! I have done some weight saving already and I will post a few pics when I get the bike apart on the weekend.

    Nitrous is tricky (as you probably know). Has to be at the right temperature, purging etc. If I was going to get away from normally aspirated I would probably try supercharging. There are a couple of superchargers that would probably "fit", but as RISKY knows, when you start experimenting and trailblazing it can get very expensive (and frustrating). There's a small supercharger on this site that spins to 18,000, would probably fit on a 250cc.
    http://www.hi-flow.com/HP002dSuper.html

    This is a picture of Bob Shaw's AA/MB Kawasaki 1428cc running on nitrous. Bob runs 8.3 @ 155mph+ on this thing, so I guess I can contact him for advice if I ever want to go down that path. He has his bike well sorted.

    Talk soon AJ.

    Cheers Frank
     

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  19. ajverma

    ajverma Active Member Premium Member

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    Hi Frank,

    No worries at all, I can give you a thorough breakdown if you need, I've done it with carbon and kevlar as well.

    Thanks for the supercharger link! Saved in my bookmark for reasons!! It joins these bookmarks:

    http://www.ecotrons.com/products/small_engine_rhb31_vz21_turbocharger/
    http://www.chinese-parts-canada.com/turbocharger_fuel_injection.html

    haha!

    E85 would be a very interesting fuel to use, I wonder if we can get out bikes to run safely on E85, that should easily see 5-6kw atw on our bikes by just adjusting timing and a/f ratios. Lots of thinking involved...

    Awesome H3 triple, I love those bikes!

    Speak soon mate, don't work too hard!

    Aj
     
  20. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Hi guys, I haven't posted in a while due to some issues. But the are sorted. Now my question is. Is there any reason why a tyga fairing kit would not fit on a A model bike? As I have picked up a 91 model zxr 250 and it has the twin headlights. So I'm saying it's a earlier 91 model. image.jpg
     

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