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fitting crash bungs

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fitting crash bungs Empty fitting crash bungs

Post by chilli Wed 23 Jan 2008, 15:22

got a set of crash bungs that im gonna fit at the weekend, thing is i want to know about drilling the fairing, i have a 25mm tank cutter for cutting the final hole, but is it best to tape the fairing where im going to drill and cut out?
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Post by Firebladeradmin Wed 23 Jan 2008, 15:58

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Post by Tazfiend Wed 23 Jan 2008, 17:41

If you run the drill fast and press gently it will cut clean without tape, cut from the painted side through to the inside!

I did a how-to on this on my home forum, but the basics are align very carefully, drill a tiny hole and refit the panel to check alignment before cutting.

If you cut 35mm rather than 25mm it gives you a bit more room for error and for the bung to bend without cracking your panel.
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Post by Tazfiend Wed 23 Jan 2008, 17:50

Hope this is some use....


Please note: When I say "refit the panel" I do not mean just hold it in place. You need to refasten at least a few of the fasteners, if not all of them, to ensure the panel is sitting exactly where it normally sits.



You start with nice, fresh, unsullied panels.

fitting crash bungs Rgfit01

First remove the panel in question and slacken off the engine bolt you're going to be replacing. Get some Blutack nice and warm and squeeze it onto the inside of the panel, refit the panel and draw the bolt out into the Blutack to make an impression.

fitting crash bungs Rgfit02

Try to do this as accurately as possible. (The R&G instructions say to paint the end of the bolt, but basically that's crap!).

fitting crash bungs Rgfit03

Remove the panel and use the mark to carefully centre the finest drill bit you've got. Seriously - the narrowest bit you have. Drill throught the Blutack (ignoring the fact it's gonna grab your drill, you can peel it off easily afterwards).

fitting crash bungs Rgfit04

Refit the panel and push the drill bit through the hole you've made to double check that it centres accurately on the bolt head. Look from a couple of angles, not just one.

fitting crash bungs Rgfit05

Now open up the hole with a larger bit (check that it is still smaller than the bit that is used on the hole saw), preferably with the panel in place. If necessary you can "travel" the drill slightly, but try to avoid it.

fitting crash bungs Rgfit06

Remove the panel and using the pilot hole to guide you drill in from the outside with a 25mm hole saw. (If you want to leave a little slack around the crash bung you can use a 30mm saw, but where the bung isn't flush to the panel you'll see the larger hole). Run the drill at full speed and use very little pressure. Let the saw wear the plastic away gently, rather than trying to cut through it quickly.

fitting crash bungs Rgfit07

Use a fine file to gently smooth off the edge legt by the hole saw. You can also use some clear nail polish or varnish to seal the edge of the paint if you want to.

fitting crash bungs Rgfit08

Now refit the panel and the R&G. Double check the instructions - usually the protectors are sided, with different length spacers. If the bolt is running into the alloy head make sure you use a torque spanner. If it's an old steel framer where you're running the bolt into a nut supplied by R&G just horse it up good and tight!

fitting crash bungs Rgfit09


The finished article:

fitting crash bungs Rgfit10
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Post by chilli Wed 23 Jan 2008, 19:26

Thanks very much for your detailed "how to" it contained all the information i wanted to know,, would you suggest that i suport the pannel with wood when drilling the final hole?
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Post by BladeBum-Russ Wed 23 Jan 2008, 19:56

that is a cracking guide, may i suggest making it a sticky in idiots guides
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Post by Tazfiend Wed 23 Jan 2008, 23:29

chilli wrote:Thanks very much for your detailed "how to" it contained all the information i wanted to know,, would you suggest that i suport the pannel with wood when drilling the final hole?
Up to you mate, I didn't support on anything but grass. Just be sure that whatever you lay it on you're not going to damage the edges. You shouldn't be using enough pressure to deform the panel at all, let the cutter take itself through.
BladeBum-Russ wrote:that is a cracking guide, may i suggest making it a sticky in idiots guides
Awww shucks. fitting crash bungs Shy
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Post by Guest Fri 01 Feb 2008, 18:40

How did you get on with the crash bungs mate? It's a lot easier with a Fighter!
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Post by chilli Sat 02 Feb 2008, 08:24

megawatt wrote:How did you get on with the crash bungs mate? It's a lot easier with a Fighter!

Havent got round to fitting them yet mate, ive been busy putting in a path from the bikeshed to the drive..... i'll get round to it in a day or 2 ...maybe...hopefully...
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