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Mark90

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Posts posted by Mark90

  1. Hi Sam, there's a few of us local to you (Nailsea) who race with AWDC, and I know of someone else in Clevedon building and 100" comp safari racer.

    If you are looking to buy a cage, or have one fitted, rather then build from scratch I would look at....

    http://www.whitbread-offroad.co.uk

    http://www.northoffroad.co.uk

    http://www.ppcages.com

    If you're looking at building then there is a lot of good info in the tech archive as white90 says.

  2. and finally, just for Mark ;)

    Thanks mate :)

    the lack of skin left on his shins!!

    That's what happened last time when I slipped off without them. Should be much less likely to slip off now.

    but they haven't been tested yet.

    Not yet but soon I'll give them a good work out for you ;):lol:

  3. perhaps in a well sealed metal container it does not go off

    That's the crux of the matter, the container must be well sealed. Petrol doesn't go 'off' in the same way milk goes off. But if the container isn't 100% sealed then the higher volatile fractions will evaporate, making what's left harder to ignite - that is basic 'science'. In the real world how many containers are 100% sealed to petrol vapours, or how many smell of petrol even when 'sealed'?

  4. One point he fails to mention is that when a significant amount of the highly volatile fractions have evaporated the petrol becomes harder to ignite, it has 'gone off'. This is not likely to become significant with large quantities stored in sealed cans over a reasonable length of time. But with smaller amounts stored relatively open, ie a carb, then the more volatile fractions will evaporate first, and quite quickly. What's left becomes harder to ingite with time as more and more of the higher fractions evaporate. The effect is most noticable on fussy starters. With my XT225 if I just switch the ignition it off, turn off the fuel tap and leave it for a couple of weeks it can be a bugger to start on the fuel that's been sat in the float chamber. If I turn off the fuel tap about 1/3 mile from home so I get back with an empty float chamber. Then when it comes to start it I open the tap and fill the float chamber with fuel from the tank and it starts fine, even if left for months. So yes the fuel does go off, but not as quick in the tank as it does in the carb.

    Regarding OF's lawnmover, we have similar experince with our petrol pressure washer which is just used during the race season, that needs fresh fuel after being left for usually about 4-6 months. It is a fussy starter and it has a small cheap plastic tank with screw cap that doesn't fully seal, if it's not upright you do get visable sepage, so it's no suprise that the volatiles do escape.

  5. Come on. Someone must have bought one of these thinking it with a great long soft spring and been Mildly miffed when it was not....

    I did, and sent it back as it wasn't 18.2". Sorry, but I don't have the measurements.

  6. True, although I have no idea who is running challenges outside the MSA this year.

    4x4 Adventures for one. Be interesting to see who else might choose to organise events outside of the MSA umbrella especially in the light of this farce over implmenting this license regulation change.

    Seems Challenge South West have decided to go their own way.

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