1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Project ZXR250A - The Wasp.

Discussion in 'Your 250cc Projects' started by Murdo, Aug 14, 2018.

  1. Murdo

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

    Messages:
    5,103
    Likes Received:
    4,008
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    I went with Frankster to pick this and some other bits up from Newcastle. Frankster took the engine home with him to Melbourne to fix the head and check it over while I worked on the frame. After making sure the forks, bearings and frame were ok, I set about modifying it for a drag bike. This required making a solid rear shock/strut to lower the bike 60mm. I slipped the forks up 60mm to level the frame and keep the geometry right.
    Frank's drag bike mods 003.jpg
    Frank's drag bike mods 002.jpg
    With that sorted I bought some 16mm tube and made the 'wheelie' bars. Used 6mm alloy plates welded to bottom of swingarm and two more bolted to the original rear footpeg mounts for the top.
    Frank's drag bike mods 007.jpg
    Also made an alloy chain guard.
    Franks drag bike 041.jpg
     
    • Like Like x 4
    • Looks good! Looks good! x 1
  2. Murdo

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

    Messages:
    5,103
    Likes Received:
    4,008
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    The bars I made the same length as the wheelbase and width of the bike (to fit with the rules) and fitted two 65mm plastic wheels to the end. I mounted the front up on a 70mm block and sat the wheels on the ground while I welded the bracing in.
    Franks drag bike 043.jpg Franks drag bike 044.jpg Franks drag bike 047.jpg Franks drag bike 048.jpg
    Ready for paint.
    Franks drag bike 050.jpg
     
    • Like Like x 3
    • Nice Work Nice Work x 1
  3. Murdo

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

    Messages:
    5,103
    Likes Received:
    4,008
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    The fairings needed a lot of rewelding and filling after the bike had been layed down on both sides.
    sheep 007.jpg sheep 008.jpg
    I was able to save the black bits with the stickers on them and did some black touch-ups around the rest.
    sheep 010.jpg
    The pattern on the sides was too complicated to be bothered repainting so I just went with a two colour scheme with a 10mm wide silver pinstripe to match the wording. CJ started 001.jpg CJ started 003.jpg
     
    • Like Like x 2
    • Looks good! Looks good! x 2
    Last edited: Aug 14, 2018
  4. Murdo

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

    Messages:
    5,103
    Likes Received:
    4,008
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    I made a basic wiring harness for it to run with just tacho and temp gauges and did the resistor in the pink wire mod too (to bypass the speed limiter).
    Franks ZXR finished 003.jpg Franks ZXR finished 006.jpg
    A couple of chair leg caps from Bunnings to hide the ugly tank holes.
    Franks ZXR finished 004.jpg
    Filled the headlight holes with some aluminium sheet glued into place.
    Franks ZXR finished 005.jpg
    And why the Wasp? Well future plans are to get the bike running straight and true with stock engine and to then put a 'sting in it's tail'.
     
    • Like Like x 2
    • Winner Winner x 2
    • Looks good! Looks good! x 1
  5. Mike Fulcher

    Mike Fulcher Active Member Premium Member Contributing Member

    Messages:
    118
    Likes Received:
    35
    Trophy Points:
    53
    Joined:
    Feb 3, 2018
    Gender:
    Male
    Occupation:
    Owner of Mikes Chainsaws & Outdoor Power Ltd
    Location:
    New Plymouth New Zealand
    My Bike:
    85' Yamaha SRX 250, 87' Honda VT250, 86' Suzuki NZ 250, 87' Honda CBX 250, 74' Yamaha AGR100R Racer
    Just a question in interest, why have you made the drag bars so long? surely if they go back so far the leverage power would actually lift the rear wheel of the ground not the front wheel, you need to keep all the power on the rear wheel, if you shortened the length, the front wheel would come higher forcing the center of gravity back onto the rear wheel, have a look at all the successful drag cars, their (wheely bars) are very short for this very reason, the only reason for using these drag bars is so that you can use all of the engines power without flipping the machine over backwards.
     
  6. Mike Fulcher

    Mike Fulcher Active Member Premium Member Contributing Member

    Messages:
    118
    Likes Received:
    35
    Trophy Points:
    53
    Joined:
    Feb 3, 2018
    Gender:
    Male
    Occupation:
    Owner of Mikes Chainsaws & Outdoor Power Ltd
    Location:
    New Plymouth New Zealand
    My Bike:
    85' Yamaha SRX 250, 87' Honda VT250, 86' Suzuki NZ 250, 87' Honda CBX 250, 74' Yamaha AGR100R Racer
    Maybe Iv'e got it wrong murdo, in fact placing the point of contact further back would require more horse power to lift the machine from contact with the track surface, any way I may have started an interesting discussion, all the best with your project, I can't believe how many you manage to work on.
     
  7. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

    Messages:
    8,550
    Likes Received:
    5,047
    Trophy Points:
    1,168
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Troublemaker
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Suzuki GSX250 *Triumph Bonneville 750 T140V *Triumph Daytona 675
    Nice job as usual from the Doc ... I sat on the Wasp yesterday and the rigid rear sure felt 'weird' ( no movement! ) to begin with but u felt 'planted' and low so I would think a great position to go straight and fast

    nice work lads :thumb_ups:
     
  8. Mike Fulcher

    Mike Fulcher Active Member Premium Member Contributing Member

    Messages:
    118
    Likes Received:
    35
    Trophy Points:
    53
    Joined:
    Feb 3, 2018
    Gender:
    Male
    Occupation:
    Owner of Mikes Chainsaws & Outdoor Power Ltd
    Location:
    New Plymouth New Zealand
    My Bike:
    85' Yamaha SRX 250, 87' Honda VT250, 86' Suzuki NZ 250, 87' Honda CBX 250, 74' Yamaha AGR100R Racer
    Yeah & the bike without its sting on sure looks like a pretty little savage Wasp, I love those wasp colours.
    Very well done job.
     
  9. Andych

    Andych Well-Known Member Premium Member

    Messages:
    2,466
    Likes Received:
    1,450
    Trophy Points:
    798
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Sydney
    My Bike:
    1987 Yamaha SRX250, Honda 1975 CB400F, Honda 1974 CB250 G5 ?
    Loving it so far.. the ONLY mod I would consider having watched multitudes of episodes of STREET OUTLAWS on Foxtel is to have some adjustment built into the Wheelie Bars for height adjustment.. especially for when the Sting is inserted because with more power you may well want to alter the angles etc..
    @GreyImport you need to get to work on the Flyer... Wheelie Bars... Wheelie Bars, repeat after me.. Wheelie Bars :)
     
    • Like Like x 1
  10. Murdo

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

    Messages:
    5,103
    Likes Received:
    4,008
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    Thanks fellas.
    Mike, this is my first go at building the wheelie bars so some experimenting may be needed. ANDRA rules say the bars can be no longer than 3.2me overall length (bike and bars) but I choose to go with what I've seen most other bikes run, ie equal to wheelbase. If the bars were shorter like a heavy front engine car then from what I've seen over the years involved in drag racing that the bike would be very hard to control when 'on the bars'. Think of it like trying to reverse a trailer with a very short towbar (compared to a long towbar) in that a small movement of the steering wheels makes a big difference to the angle of the trailer, so by having the W/Bars longer gives the rider better control to keep it going straight.
    Yes, I have built adjustment into the top mounts. Should give between 1" to 3" above ground level, may need more or less when Frankster gets it on the track.
    Bike is now back in Melbourne, but Frankster left another frame and engine cases here for me to have a think about how to mount 'the sting'.
    Yes, Grey needs to get on with his bike as the March meeting will be here sooner than you think it will and we want to have ALL the 250's ready to run. :D
     
    • Like Like x 1
    • Agree Agree x 1
  11. Andych

    Andych Well-Known Member Premium Member

    Messages:
    2,466
    Likes Received:
    1,450
    Trophy Points:
    798
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Sydney
    My Bike:
    1987 Yamaha SRX250, Honda 1975 CB400F, Honda 1974 CB250 G5 ?
    All good @Murdo, I was working late and didn’t look closely at the pics.
    As I said my experience is limited to many many episodes of Street Outlaws

    Are you able play around with rear wheel size? Depending on what appropriate size drag slicks are available and the ability to get the rear hot enough to get to the right temp for diameter etc
    Once you start getting into these sorts of areas you will find different settings for different tracks, times of year etc.
    I will be watching eagerly as the set-up side I find fascinating.
    Good work so far


    Sent from my iPhone using Tapatalk Pro
     
    • Like Like x 1
  12. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

    Messages:
    8,107
    Likes Received:
    5,931
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Home Page:
    My Bike:
    90 CBR250RR ,Suzuki T500, 2005 GSF1200 Bandit and a 1972 t250j
    looks good Murdo, you are going to need a very long trailer to move that one.
     
    • Agree Agree x 1
  13. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

    Messages:
    2,233
    Likes Received:
    1,201
    Trophy Points:
    823
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    Spada & VT250F
    The Wasp is back in Melbourne now, so I will post an update as the engine gremlins get looked at and we start track testing. Unfortunately, I'm interstate for the next couple of weeks, so don't hold your breathe.

    Congrats to Murdo for his hard work and the bike he has built. A quick spurt up and down the street checked out okay and the bike felt "right".

    Unfortunately, the Chief popped over after we'd given it a run, but he did try it on for size. Hopefully, the flyer will be the next Tamworth-based drag bike to debut.

    The Chief on The Wasp.jpg
     
    • Like Like x 2
    • Thanks! Thanks! x 1
    • Funny Funny x 1
  14. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

    Messages:
    2,233
    Likes Received:
    1,201
    Trophy Points:
    823
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    Spada & VT250F
    The Wasp - background

    As Murdo has gone over most of the fabrication of the bike, I thought I'd put a bit of background up for anyone who's interested.

    The idea behind the bike was to build a 2fiftycc drag bike that we could really push on the line. This meant wheelie bars, and wheelie bars are best on solid rear ends, so both those features needed to be built in to the frame. Lowering the bike was also discussed. The original mock up was lower...

    The Wasp 1.jpg

    But, we went with 60mm drop front and back to start with and Murdo has built some adjustment into both the rear height and the wheelie bar angle. @Mike Fulcher - the wheelie bars aren't as long as they might look. I'll try to get a pic with them on and post it. My first time with wheelie bars, so learning curve for me too.

    I've never ridden a solid rear bike before and the initial run up the street wasn't fabulous. After a few adjustments, the second lap was much better and bike launches straight and seems to get the power down as hoped. We won't be running the wheelie bars until the engine is fully sorted. Thanks again @Murdo for a great job.
     
    • Like Like x 2
    • Thanks! Thanks! x 1
  15. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

    Messages:
    8,107
    Likes Received:
    5,931
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Home Page:
    My Bike:
    90 CBR250RR ,Suzuki T500, 2005 GSF1200 Bandit and a 1972 t250j
    Grey.jpg
     
    • Funny Funny x 3
    • Like Like x 1
  16. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

    Messages:
    8,107
    Likes Received:
    5,931
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Home Page:
    My Bike:
    90 CBR250RR ,Suzuki T500, 2005 GSF1200 Bandit and a 1972 t250j
    Yamaha.jpg
     
    • Funny Funny x 3
    • Like Like x 1
  17. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

    Messages:
    8,550
    Likes Received:
    5,047
    Trophy Points:
    1,168
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Troublemaker
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Suzuki GSX250 *Triumph Bonneville 750 T140V *Triumph Daytona 675
    :lolsign:

    This is what needs to go on it .... :D



    wasp.jpg
     
    • Agree Agree x 2
  18. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

    Messages:
    8,107
    Likes Received:
    5,931
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Home Page:
    My Bike:
    90 CBR250RR ,Suzuki T500, 2005 GSF1200 Bandit and a 1972 t250j
    wasps.jpg
     
    • Funny Funny x 3
    • Like Like x 1
  19. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

    Messages:
    2,233
    Likes Received:
    1,201
    Trophy Points:
    823
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    Spada & VT250F
    That's too funny Chris.
     
  20. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

    Messages:
    2,233
    Likes Received:
    1,201
    Trophy Points:
    823
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    Spada & VT250F
    @GreyImport I was thinking that on the drive home. Are those wasp stickers?
     

Share This Page