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New video racing my 750 Commando in Superbike class at Mosport 2018

Discussion in 'Norton Commando Motorcycles (Classic)' started by Doug MacRae, Jan 6, 2019.

  1. jbruney

    jbruney

    Joined:
    Jan 5, 2019
    I've got to watch this almost every day. Good run there, and pleasing to see the Honda get dusted at the end. Sharp driving and nice Snortin' Nort'.
     
    Doug MacRae likes this.
  2. Fast Eddie

    Fast Eddie VIP MEMBER

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    Oct 4, 2013
    Phil Pick is dead? It’s the first I’ve heard of that Al! Are you sure and what’s your source?
     
  3. Doug MacRae

    Doug MacRae

    Joined:
    Jan 28, 2010
    Thanks!!
     
  4. 84ok

    84ok

    Joined:
    Aug 10, 2014
    vid is awesome!!!

     
  5. Chris

    Chris VIP MEMBER

    Joined:
    Jan 21, 2008
    Acotrel

    Please check your facts.
    Phil Pick is alive & well. Although he no longer seems to be online & has not run his spares business for a number of years.
    Miss his input on triples.
    Chris
     
  6. Fast Eddie

    Fast Eddie VIP MEMBER

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    Oct 4, 2013
    Thanks for confirming that Chris. Good to know, Phil is one of ‘the good guys’ !
     
  7. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    You mention ft end pogo and chatter. What kind of fork are you using?
     
  8. 84ok

    84ok

    Joined:
    Aug 10, 2014
  9. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    I thought I read somewhere that Phil Pick had passed away. Those two pairs of gears for the Triumph 5 speed box are an excellent idea. If 2nd and 3rd are closer and higher, the step between 1st and 2nd is bigger, but that only matters as you approach the first corner on most race circuits. The first corner is not usually very far from the start line. Top gear would effectively be an overdrive. But the middle three gears of the 5-speed box would become extremely effective. When the needle of the tach does not drop much when you change gears, you don't have to wait while the motor spins up again. It would still lag a bit when you change into top, but when you race, you don't usually get into top that often that it would matter.
     
  10. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    If you read the latest Motorcycle Classics magazine, there is an article about the RD400 Yamaha. It mentions the beneficial effect of the revised gearbox. The RD350 box had wider ratios and a lower first gear. The RD400 has the same ratios as the TZ350. When you road race any road bike, you always have two problems which hold you back - the gearbox and the steering geometry. They are intended to promote safe commuting. A Commando with the standard box is as slow as a wet week.
     
    Last edited: Jan 12, 2019
  11. sportsroof

    sportsroof

    Joined:
    Mar 4, 2014
    As always, engrossing and excellent!
    Martin
     
  12. Doug MacRae

    Doug MacRae

    Joined:
    Jan 28, 2010
    Using 35mm Suzuki Water Buffalo forks with emulators. They work very well but to do low 39's at Mosport on a bike that is not a high hp machine you are pushing hard through the corners and I was prob getting close the limit of what they could do. Corners 2, 4 and 8 are 100-110 mph. The Honda CR750 in the video has done 1:38 laps but has between 90-95 hp.

    Thanks a lot Martin!
     
  13. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    You should be able to push your bike hard enough to drift without having suspension problems. I had to tune in my suspension to get it to work right and then I could push it all the way to where the tires began to break loose. There was a little chittering when this happened at 130+mph? (turn 8 at Willow Springs) but it was minimal and I think it went along with the tires losing traction or high spots on the track.

    You also have to be sure the rear isn't chattering and transferring that motion to the front. This happened on one of Ron Woods Rotax singles that I tested for him. The rear shock had teething problems and chattered so badly that the front end went along with it. Its not easy to turn around and look at the rear wheel when you're pushing it to the edge.
     
    Last edited: Jan 13, 2019
  14. chris plant

    chris plant

    Joined:
    Nov 6, 2008
    well done doug,great race,i can see why you was going steady,all that Armco and no run off areas to speak of chris
     
    Doug MacRae likes this.
  15. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    I had that problem with my Triton. It felt as though the front was jumping, but a friend of mine was watching and saw it was the rear end. We upped the damping on the rear shocks and the problem disappeared. But one of the main problems with bikes in corners is when you are forced to back off halfway through - the bike then tends to wallow and you go slower. If your steering is set up in a certain way so that the bike tightens it's line substantially if you gas it when cranked over, you find you don't ever need to back-off in corners and the bike tends to lean less anyway. The worst thing is if you get into a high speed bend too quickly and are going to crash either way - brake or accelerate. If the bike is right, when you turn it on again, it will go around
     
  16. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    The friend who spotted the rear end of my bike jumping was an excellent A-grade road racer on Manx Nortons. One day he came to Winton with Mick Hone and Robbie Phillis and got onto Robbie Phillis's Katana. He got into the sweeper too fast and found himself in that situation - whatever he did, he was going to crash. So he turned it on a bit harder and got around - more arse than class. If the bike had not been right, he was gone. Road bike steering is not always the best. Back when I raced regularly, I simply adjusted to the bike and crashed a lot. Later I made the bike do what I wanted it to do - so these days when I ride, I ride without thinking.
     
    Last edited: Jan 13, 2019
  17. jbruney

    jbruney

    Joined:
    Jan 5, 2019
    Again for the thrill of it.
     
    Doug MacRae likes this.

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