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Thread: First time on the dragstrip!

  1. #1
    Join Date
    Dec 2019
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    Portland, Oregon
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    Default First time on the dragstrip!

    I took my first passes last night at Portland International Raceway on the GS drag bike. Good stuff!

    Biggest problem was that I couldn't get the air shifter to work. It's probably something simple, am going to do some troubleshooting and/or bench testing this week. So I had to swing my foot up ~2' from the rearset to the shifter every time I wanted to shift.

    Made good progress jetting the new "cone" carbs. Started off with 150 mains, bike ran so-so. Tried 160s, it ran worse, then 145s, and it ran much better. I'm guessing mains in the ~140 range will do the trick. Ordering them tonight.

    Had a good crew come out to help with setup, tuning, etc. Looking forward to the next time out!

    timeslips_small.jpg

  2. #2
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    Brass hunt ... Mikuni cone carbs had Keihin hex mains when I got them. Most of my mains are Mikunis, I need to get a new jet box for Keihins!

    brass_small.jpg

  3. #3
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    Replacing the main jet drain plugs on the carbs by touch. That's pure concentration!

    fiddling_small.jpg

  4. #4
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    Way to go, Patrino.
    Great having a couple friends at the track to bounce ideas or offer encouragement.

    Changing jets blind is indeed "fiddling".
    2@ \'78 GS1000

  5. #5
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    Nice. Glad it went relatively well.

    When consulting the magic 8 ball for advice, one must first ask it "will your answers be accurate?"

    Glen
    -85 1150 es - Plus size supermodel.
    -Rusty old scooter.
    Other things I like to photograph.....instagram.com/gs_junkie
    https://www.flickr.com/photos/152267...7713345317771/

  6. #6
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    Also, found the timeslips ... best one was 11.695 @ 120.48 mph.

    Plenty of room for improvement!

  7. #7
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    Default

    Quote Originally Posted by patrino View Post
    Also, found the timeslips ... best one was 11.695 @ 120.48 mph.

    Plenty of room for improvement!
    Cool...

    Reaction time? 60ft time? 1/8 mile time? Or perhaps just a scan of the timeslip?
    Bob T.

    "That which you manifest is before you." -- Enzo
    "I always prefer to believe the best of everybody, it saves so much trouble." -- Rudyard Kipling
    "...for our existence to hold any value, it must end. To live meaningful lives, we must die and not return." -- Number Six

    '83 GS1100E ~ '01 TRIUMPH TT600 ~ '99 TRIUMPH TROPHY 900 ~ '67 HONDA CUB



  8. #8
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    Dec 2019
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    Best run:

    R/T: 0.739
    60': 2.002
    1/8: 7.672 @ 96.17
    1/4: 11.695 @ 120.48

    second best:

    R/T: 0.222
    60': 2.208
    1/8: 7.725 @ 97.97
    1/4: 11.76 @119.31

  9. #9
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    I'm confused, but it's been a long time since I's on a drag strip. Your best run was when you left, right at, 3/4 sec. late? Dang, You'd have been down in the 10's if you left on time.
    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

  10. #10
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    Dec 2019
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    @rphillips, like I said, room for improvement!

    And on the bike side, the better jets are on order, and I'm diving into the air shifter this week.

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