chrisspartan
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| posted on 29/9/08 at 12:03 PM |
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R1 Throttle Body (Inj) Plastic Sliders - Required??
Hi, my R1 (and I believe many other bike throttle bodies) have plastic sliders within them which are operated by inlet manifold or airbox pressure.
When a vacuum is applied the slides open.
Does anyone know what function these perform and whether I should get them working? I plan just to blank off and ignore.
My only guess is they might smooth the airflow???
Thanks Chris
[Edited on 30/9/08 by chrisspartan]
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smart51
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| posted on 29/9/08 at 12:14 PM |
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Carbs or throttle bodies?
on R1 carbs, the slides hold the needle, which meters the fuel under part throttle condition. You need them.
Throttle bodies for EFI, I don't know what they do but I bet the Japanese wouldn't fit them if they weren't needed.
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Paul TigerB6
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| posted on 29/9/08 at 12:15 PM |
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Similar post just below on the front page. That should give you the answer.
This one here
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David Jenkins
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| posted on 29/9/08 at 12:39 PM |
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As said above - essential for the carb's operation.
Maybe this link this link will help to explain how one of these carbs operates.
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nstrug
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| posted on 29/9/08 at 01:58 PM |
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quote:
Originally posted by smart51
Carbs or throttle bodies?
on R1 carbs, the slides hold the needle, which meters the fuel under part throttle condition. You need them.
Throttle bodies for EFI, I don't know what they do but I bet the Japanese wouldn't fit them if they weren't needed.
On the first generation injected R1 (5PW) the throttle bodies had CV slides, very similar to carbs. Racers block them open and just run on the primary
butterfly. On a roadbike/car, this will result in horrible jerky throttle response. On a racebike, it gets them a little more power at WOT.
On the later EFI engines they were replaced with secondary butterflies.
On carbed engines they are essential for correct operation of the carb.
Nick
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chrisspartan
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| posted on 29/9/08 at 04:55 PM |
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Sorry forgot to say mine are injection throttle bodies so no needle in the plastic slider, but the sliders are still there and go up and down like
described.
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sickbag
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| posted on 29/9/08 at 07:20 PM |
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They're there to help keep the air-flow fast and smooth at all engine speeds. You will loose driveability if you try to remove them.
They're also set to open 'a little slow' to help stop the bike going arse-over-tit if the rider opened the throttle too quickly.
Never really worked like that in practise though. 
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David Jenkins
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| posted on 29/9/08 at 09:04 PM |
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quote:
Originally posted by chrisspartan
Sorry forgot to say mine are injection throttle bodies...
Best change the thread title then!
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