August 23rd, 2020, 09:06 PM | #1 |
ninjette.org member
Name: Arthur
Location: Sammamish , WA
Join Date: Jun 2020 Motorcycle(s): 2008 Ninja EX250J; 2005 CBR1000RR Posts: 108
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Boiled my rear brake fluids: practicing Gymkhana moves
I was pushing the rear brakes quite a bit practicing Moto Gymkhana figure-8 moves and I think I boiled the brake fluid. All of a sudden the rear brake pedal went down to the floor when I depressed it.
Stopped, investigated and I could not see anything wrong with it. So, I decided to head home with only the front brake in my 5 min journey. While I was heading back the rear brake slowly returned to normal. When I got back, I flushed the rear brakes totally. I'll resume practice tomorrow and see what happens.
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2 Wheelers: 2008 Ninja 250R; 2005 CBR1000RR 4 Wheelers: 2018 M3; 2015 M235xi |
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August 23rd, 2020, 11:17 PM | #2 |
old git
Name: Steve
Location: Geneve Switzerland
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You must have had air in the system for it to do that.
Steve
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August 24th, 2020, 07:27 AM | #3 | |
Rev Limiter
Name: Jay
Location: WI
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Quote:
If you are using the rear brake enough to overheat it, you may want to start working more with the front brake. It's the business-end when it comes to braking. I use the rear only for slow speed maneuvering and low traction conditions. With good tires in good conditions, and proper technique, the front brake should unload the rear enough that the tire's contact is minimal - and so is it's braking ability. |
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August 24th, 2020, 07:55 AM | #4 | |
ninjette.org member
Name: Arthur
Location: Sammamish , WA
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Quote:
I am not an advanced Gymkhana practitioner yet. So, I'm not at the stage where my skills are good enough to manage an ultra-compressed fork in a turn. Thus, my use of rear brakes for beginners, learning self-steering at speeds in tight corners. Anyway, the issue is moot, now that the brake fluids were refreshed. No issues this morning with fresh EBC fluids.
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August 24th, 2020, 08:17 AM | #5 |
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Good for you with practice! But be careful about developing bad habits that may be difficult to break later. Don't worry too much about speed on straights. Practice adjusting speed with throttle only and faster tip-in on corners. Similar to "the pace" on mountain rides, you want to set up a rhythm that doesn't upset chassis too much.
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August 24th, 2020, 08:23 AM | #6 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
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That's a cool video.
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August 24th, 2020, 08:32 AM | #7 |
ninjette.org member
Name: Arthur
Location: Sammamish , WA
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Good vid.
Yes, no pressure on the handle-bars. Just lean and the bike will steer itself. Let go brake half-way through turn and the bike will wake up from leaning automatically.
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August 24th, 2020, 10:27 AM | #8 |
Rev Limiter
Name: Jay
Location: WI
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I get Gymkhana, but dropping the front-end with front braking is going to help you get around a tight corner quicker.
This is a classic motorcycle Gymkhana video -
Link to original page on YouTube. |
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August 24th, 2020, 01:59 PM | #9 |
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What's that lifting of upper-body for when he's entering corners?
I noticed he's got more upright (and narrow) bars for more leverage and taking weight off hands. |
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August 24th, 2020, 05:10 PM | #10 |
ninjette.org member
Name: Arthur
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Shifting weight to rear wheels to boost contact patch and short burst acceleration.
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August 24th, 2020, 05:14 PM | #11 | |
ninjette.org member
Name: Arthur
Location: Sammamish , WA
Join Date: Jun 2020 Motorcycle(s): 2008 Ninja EX250J; 2005 CBR1000RR Posts: 108
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Quote:
It's easy to crash doing heaving pushing on front brakes into a corner; albeit, if you do it right, it's very effective. It's usually done in a smooth action: applying during pre-turn entry and letting go upon entry, followed by releasing rear brakes halfway in the turn. I'm not there yet ... I'm a newbie to Gymkhana.
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August 24th, 2020, 05:18 PM | #12 |
ninjette.org member
Name: Arthur
Location: Sammamish , WA
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Here's a more recent one using a liter bike and taller handle-bars.
https://www.youtube.com/watch?v=uaty...&index=13&t=0s
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August 24th, 2020, 05:21 PM | #13 |
ninjette.org member
Name: Arthur
Location: Sammamish , WA
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This is the crazy French guy that started the ball rolling for me ...
https://www.youtube.com/channel/UCJh...0lCehzALrzF46Q Kintaro has a whole series on becoming one with the bike rather than fighting the bike.
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August 24th, 2020, 09:24 PM | #14 |
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August 25th, 2020, 05:17 AM | #15 |
ninjette.org member
Name: Arthur
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That's what I've been saying... there's an acceleration before the curve entry point, followed by applying front + rear brakes, leaning, releasing front brakes just before entry point.
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August 25th, 2020, 07:54 AM | #16 |
ninjette.org certified postwhore
Name: AKA JacRyann
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I downloaded Jay's video and watched it in slow-mo. On acceleration sections, he's leaning forward and down to keep from wheelying. Then, he's definitely yanking up at end of straight after all acceleration has already been done. He's yanking up after braking and before diving in and turning. Maybe that's a forceful countersteering effort to make bike dive into turn.
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August 25th, 2020, 08:13 AM | #17 |
The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
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Respect to those who possess the predisposition to make bikes turn like that at slower speeds.
I can't get my bike to turn that sharp in the garage while pushing it. lol
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August 25th, 2020, 10:20 AM | #18 | |
ninjette.org member
Name: Arthur
Location: Sammamish , WA
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Quote:
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August 25th, 2020, 12:04 PM | #19 |
ninjette.org dude
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Huh? How do you believe the bike is flipping from one side to the other that quickly?
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August 25th, 2020, 06:52 PM | #20 |
Rev Limiter
Name: Jay
Location: WI
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Honestly, I'm surprised the fast guys are using such large cycles.
Since there's no significant amount of speed, and minimal acceleration area, a small light cycle seems like it would be an advantage. |
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