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Wheels with 4 inch pcd wheel stud spacings, as per mini's are readily available new, it's not worth looking around breakers yards any more, unless you are very lucky it will be just as cheap to buy the correct wheel and tyre new.
With a 4 ply tyre fitted, you will get 10in wheels for close to
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I should think and inddor trial is fairly safe. There are just 10 of so machines basically going one at a time in a very large area. Imagine an indoor supercross meeting with a dozen bikes going for lap after lap all evening. Now that's a different scenario.
I wonder if the ACU/FIM have done any research on this subject? Catalytic converters are starting to appear on road bikes recently.
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Malibudon, I'm not sure about the Cornish Hurling part of your reply but thanks for taking the time to find the link.
Here is a snippet taken from your link:
The removal of alkyl lead compounds certainly reduces the toxicity of
exhaust gas emissions when used on engines with modern engine management
systems and 3-way exhaust catalysts. If unleaded gasolines are not
accompanied by the introduction of catalysts, some other toxic emissions
may increase. Engines without catalysts will produce increased levels of
toxic carbonyls such as formaldehyde and acrolein when using oxygenated
fuels, and increased levels of toxic benzene when using highly aromatic
fuels.
There is little doubt that gasoline is full of toxic chemicals, and should
therefore be treated with respect. However the biggest danger remains the
flammability, and the relative hazards should always be kept in perspective.
The major toxic risk from gasolines comes from breathing the tailpipe,
evaporative, and refuelling emissions, rather than occasional skin contact
from spills. Breathing vapours and skin contact should always be minimised.
Whether you are sceptical or not this subject should make you think.
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I've found an interesting link on the unleaded fuel subject. I've started a new topic in Mechanical talk, as we've gone of the question of this original post.
Sorry if this all seems a little boring, but it's a real eye opener to anyone who washes their filter in petrol. Or those who sit in a queue with their engine running.
Cheers
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The discussion on another thread got around to possible dangers of unleaded fuel when used for cleaning air filters etc.
The topic went on to consider the further danger of breathing in exhaust fumes from a machine not fitted with a catalytic converter (the device used to clean up fumes in all new(er) cars.) ie all trials bikes.
Here is a link to an article about this very subject. Whilst it doesn't mention motorcycles, effectively a trials bike is a simple single cylinder engine, as is a lawn mower or strimmer etc
Take a look and draw your own conclusions, or better still do some research on the chemicals used in unleaded fuel which are used to replace the lead..... And think of this the next time you sit in a queue for a section or are tempted to wash that chain in petrol.
Click here.
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Sitting in queues at sections
Yep. Worrying when you think about it isn't it?
I read a report on emissions a few years ago concerning the chemicals which are not filtered out of exhaust gas until a cat reaches running temperature. The writer of the report came to the conclusion that you should avoid coming into contact with exhaust emissions at all costs until your cat warms up.
Imagine what he would have said if he'd been asked to consider a dozen trials bikes running unleaded fuel mixed with oil all sat in a queue waiting their turn with engines running.
He also researched the effect of breathing unleaded petrol fumes, these fumes are also very bad for you.
Forgive me if I am wrong but don't American petrol pumps make an air tight seal over the filler because of this?
I'll try to find the report and see if there's a link I can post, it makes interesting reading for any petrol head.
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Yes, Unleaded petrol contains very nasty chemicals which are used to replace the lead once used in fuel.
This would actually make a very good topic for discussion on its own.
The chemicals in unleaded can cause cancer if they come into contact with the skin or are inhaled. Modern uleaded fuel is portrayed as being a green fuel. This is only true when it has passed through a catalytic converter after being used in the engine.
Vehicles which have not warmed up, have a faulty cat or worse no cat at all allow some very nasty gasses to be expelled from the exhaust.
Never inhale the fumes from unleaded petrol, avoid all contact with the skin and make sure you avoid breathing in the fumes from a vehicle warming up on the drive or without a cat fitted.
As catalytic converters have been fitted to all petrol cars in the UK since 1991 (I believe) you will encounter relatively few cars on a regular basis which don't have a cat fitted.
So that is fortunate, luckily I can't think of a scenario where you might find yourself in regular exposure to exhaust gasses wich haven't been passed through a good warmed up catalytic converter.......... can you?
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This is another way of putting over what I was trying to describe.
I said we used to make sure there was a little sag on the rear preload at circuits such as the TT,(Which are fast bumpy tracks) This is done by winding off the preload on the rear sping. It makes the bike feel 'longer' and more stable.
But the down side of this is it requires more effort to turn, which on a short tight track is not so desirable.
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Isn't that the other way around?
In the old road racing days, when we needed to make a bike more stable at high speed, for example at the Isle of Man TT, we used to increase the front ride height and make sure there was a little sag on the rear preload, thus increasing the trail and making the bike more stable.
At low speed circuits where fast turn in was required, such as Mallory Park or Cadwell, we would drop the front ride height and remove all the rear sag completely.
I know no better, but isn't that true for a trials bike too?
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I agree with the oil but is 50:1 a bit rich?
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Correct answer I guess I'm just a bit lazy. I just wish we saw a bit more dust aroud here... all we ever get is mud.
In the summer (if there's a trial that day ) I do tend rub a little into the palm of my hand (wearing a plastic glove) and rub it into the filter but certainly not enough to make it wet. Just enough to catch fine dust.
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I must say I run mine dry, however I don't often ride in dusty conditions here in the wet old Mildands UK.
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I've been keeping an eye out for one on Ebay recently. There's a tidy looking one listed at the moment.
Search for Scorpa and you'll find it.
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The main reason for raising the subject is that we may well start the UJ from the Village Hall at Blackwell this year. We used it for the OK Supreme LDT and it is perfect apart from the fact that it is another 5 miles from Dovedale and back again from what we are used to.
The UJ would work really well using a route similar to the LDT apart from mileage.
Hence my question. What is the ideal length for a Classic trial?
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Good pictures, thanks very much.
Just take a look at that root climb on the last couple of album pages
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For the Stratford Clubs Union Jack round we would welcome any machine in the Non Championship trail bike class. Either the Hard or the Easy routes. It's non championship so it doesn't matter if you are stretching the concept of trail bike a little
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I'm fairly sure Alexz and Ross were indeed on 125's as per the programme, Lee was on a 250.
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Do you think riders of the smaller classic machines would enjoy a longer lap?
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You mean one rule for all?
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Looking at the results makes me realise what a brilliant ride Dan Thorpe had.
To loose eight was amazing but when you see that included a 'five' at section 20, to have 34 cleans in such a wet muddy event was outstanding.
Well done to him and indeed to everyone who finished. You all deserve a round of applause!
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What an amazing photo. Is that Raga?
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Yes. The success of the Novogar championship depends on what the lesser lights loose, not the 'stars'. Hopefully the genuine Clubmen riders didn't find it too tough.
From what I saw, I am fairly confident that Stratford-Upon-Avon Clubs Colmore Cup in March will be a 'tad' easier than the Vic Britain was today.
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What a poor state of affairs this is turning into. It's getting to the point where we just don't care.
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I lost count of the number of crashes I had....... and I was on foot!
It really was wet, thank goodness the Clerk of the Course came around before the first rider and eased the three sections where we were (14, 15 & 16) amd they were still hard in the conditions!
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Ahh ha.. I wondered who this star in black was. Again, sorry the pictures are dodgy but the rain was persistent.
I can't tell you how awful the roots were on this section, the riders crossed the stream and turned back to face a vertical bank maybe 20ft high of undercut wet muddy roots. More like riding up a step ladder. Yuk!
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