woody

You can buy perforated tubes, no need to make them

In that case you'd need MSA approval to get from home to an event and from an event back home as in every instance you are only using the road to get to an event that is held off road. In a road trial the road doesn't form part of the competition, unlike speed trials for cars which is what is was intended for. Travel on the road is purely to travel to and from locations where the event is held, so how does that differ from getting to and from a closed circuit event - especially if you ride your bike to the event instead of transporting it (yes, this is still done sometimes) As I mentioned before, it would be interesting to see what the two clubs holding the Normandale rounds next week have done to comply, also the Vic Brittain organisers in our centre which would also have been approved

Pete, are you sure you're not over doing this? There is nothing in a motorcycle trial that is licenceable which is what I understand a temporary authorisation is required for - licenceable events for which the organisers don't hold a required licence If you need one for a road trial you'd need one for any closed circuit trial too, the type of trial would be irrelevant, surely. If you had a beer tent organised I can understand you having to apply as selling alcohol requires a licence There are two road based Normandale events next weekend which obviously have permits issued, why not give a call to the secretaries to see how they achieved it. Unfortunately these days, just because you have an answer from the police on something, it doesn't mean it is correct and they may have misunderstood what the event actually is. Ask five different officers what a bike needs to pass an MOT and you'll get five different answers...

Falcon on the back, Magical springs have worked well in my Bultaco forks. WES springs used to be ok but the last ones I bought were useless, way too soft and nothing like those in my mate's 240 Fantic which were bought years ago. We tried them in several bikes with the same result. Too soft. WES no longer exist in the UK and have been bought by someone in Spain.

Re: the ACU letter, they're are looking at ways of exempting trials from the act The act has to be open to interpretation, so let's hope they find a loophole. This legislation is utterly uneccessary for road trials where the competition itself takes place away from public roads. It could be argued that using your bike to get from group to group on a road trial isn't any different from riding your bike from home to a closed circuit event and then home again. You're only on the road to travel to the event, not to compete. Not the same thing at all as speed events conducted on public roads such as car rallies I'd wager the trials reference in the title of the act relates to vehicle speed trials that take place on public roads. Surely this act is being wrongly applied - hopefully..!!??

Again, if it was me, I'd go out on the bike and try it as it is, then remove the airbox, fit one of those foam filters with the integral hose that are used on a lot of Pre65 bikes and try the bike again That way I would have a direct back to back comparison between performance with a standard airbox against the unrestricted flow of no airbox. That way I'd see first hand if there is any difference rather than relying on subjective opinions that are going to vary considerably. Having ridden Normandale rounds for the last 20-odd years, as well as riding standard Ossas and Bultacos on the B or 50/50 route in modern trials, I can assure you that there is nothing in those events that a standard 240 Fantic in good working order won't do with its eyes shut.

The following types of events receive automatic authorisation, it need not be applied for Type B - An event on which no merit is attached to completing the event with the lowest mileage, and in which as respects such part of the event is held on the Public Highway, there are no performance tests and no route, and competitors are not timed or required to visit the same places, except that they may be required to finish at the same place by a specified time. Type C - An event in which, as respects such part of the event as is held on the Public Highway, merit attaches to a competitor’s performance only in relation to good road behavior and compliance with the Highway Code. I'm no legal expert but couldn't a trial be categorised as either of these. Type B is a single lap road trial. The 'route' is advisory only, competitors can use their own route to get from point to point if they wish, there are no checkpoints, the route isn't timed Type C is so wide open that you could say that if a competitor isn't reported for non-compliance with the highway code, they are merited with a finisher's award in the event. There has to be some scope in using either of these two for automatic approval?

The bike has tubeless rims as standard fitment. The rim should look like this http://www.ebay.co.uk/itm/sherco-trials-bike-rear-wheel-sprocket-and-disc-/271141855754?pt=UK_Motorcycle_Parts&hash=item3f2150620a

I hit the send button too quick on the last post... I use silicon sealer in place of the rubber seal which are an utter pain in the a*** to fit (a type that is suitable to bond to metal / aluminium) It's impossible for the air to leak through the spokes with that but still some tyres go down after a few days whilst others hold the air indefinitely. My only thought is that it must seep past the bead on some rims. If you use silicon, make sure you only put enough in to cover the spokes, don't completely fill the well in the rim where the spokes sit, otherwise you will dig into it with tyre levers if it sits too high. Also, keep it off the suface area either side of the well, because if you get it on there, the tyre bead will not slide as it should which may not be so bad fitting it, but wait until you try and get it off... Make sure it is completely cured as well before fitting the tyre. I usually give it a week on a radiator or airing cupboard.

The tubliss system is designed for tubed type rims, I doubt it would work or even fit properly on a tubeless rim Hasn't your 175 got a tubeless rear wheel?

You are taking this subject much too seriously. There is absolutely no jealousy or intimidation on the part of anyone. Probably because English isn't your first language you have misunderstood the ironic humour in the comments. Irony is a big part of English humour (and I don't mean that as criticism as your English is very good) The works Hondas were developed for Honda in the UK, originally by Sammy Miller. Honda supported quite a few UK riders on the original 305 longstroke bikes and then the 305 and 360 shortstrokes, therefore there is a lot of knowledge here about these bikes from people who were involved with them and rode them. When Honda pulled out of trials in 1977 Honda UK took over and kept the UK team going with development support from Japan. It seems Honda got interested again and continued to develop the bike themselves which was now the 360 only. It was into the 80s before Japan completely ran the team again which was by now just two riders, Lejeune and Hattori Any number of 1970s bikes still survive and there were also replica frames made for the spare engines that had been provided, so there are a number of 'official' replicas with works engines too. In the 1980s and 90s, Honda's policy was to crush works bikes at the end of each season - hence comments on here about help from Honda - irony The shortstroke bikes date from '76. There were many variations on the bikes

If you search the Bultaco forum using the word 'packing' you'll find some previous topics on packing the exhaust with more useful info.

These are the jets on the PHBH 28BS that I have on my 340 and it runs very clean. Pilot 40 Main 98 Needle tube AV264 Needle X2 Slide 4.5 The early 250 and 325 bikes which used a 627 27mm Amal shared the same jetting, so although mine is a 28mm and on a 340, it won't be too far off for the 250 and a good starting point.

Pictures have now been deleted from the mx site

You need to understand the history of these bikes - I don't think Honda will be very helpful...

The frame is that used on the 250 models from 158 - 190. The 175 is essentially a sleeved down 238cc model 190 with the blue colour scheme. They were built primarily for the Spanish holiday resort hire market with big tank, dual seat etc. Some ended up over here in trials trim.

This is your model, although the frame is the wrong colour on this one it has the right mudguards fitted. There is only one blue and this is it http://www.ebay.co.uk/itm/RARE-BULTACO-175-SHERPA-TWIN-SHOCK-TRIAL-1495-ONO-PX-BETA-BSA-TRIUMPH-/200880595933?pt=UK_Motorcycles&hash=item2ec56aa3dd They are readily available on ebay although as someone has already mentioned Bultaco UK (also trade under In Motion) will have all you need. http://www.ebay.co.uk/itm/Trials-Plastic-Blue-Mudguards-Bultaco-Ossa-Montesa-Twinshock-Pre-65-/380547589499?pt=UK_Motorcycle_Parts&hash=item589a67657b

Modern filming style is wonderful isn't it. First pioneered by Top Gear years ago (before the current line-up of clowns) when they zoomed in and out, swapped camera angles, tilted the camera shots so many times that you never actually got a clear or complete view of the car they were "showing" you Sheffield must have been using one of their old camera crew. I found the minder cam so innovative and useful that I hit the off button after about 10 minutes - the bit where they switched from Fuji mid-section to show about 15 seconds of Dabill just sitting on his bike waiting his turn was particularly inspired direction too. Like watching paint dry.

I have a dellorto on my 340, when I next work on it I'll note the jetting and let you know. It should be close enough

At least you tried so the effort for doing that is appreciated Clashes by Nationals with club and centre events is and always has been inevitable and even more likely now with so many additional events on the calendar in comparison to 20 / 30 years ago. Can't be helped. The Greensmith Miller round usually clashes with the Lakes 2 day for example, so I don't get to ride the Greensmith too often. The Nostalgia usually clashed with another Miller round and my own club's 2 day club trial and we now have an excellent modern 2 day road based trial around the same period, so another potential clash. Just one of those things. But hopefully, next year, the national classic events can avoid each other to the benefit of all.

OK, well that's me out of ideas - if the rim hasn't given problems before, the rimlocks are the same as used by others, it can only leave the tyre

ok, just wondering as tubeless don't seat well on the DID.

I remember the diameter discussion but I've no idea how you would accurately measure the ID of a tyre. Is this the first tyre you've fitted to this bike - If the bike is relatively new to you are you sure it hasn't been fitted with a tubeless rim? I'm not implying that the tubed tyre can't slip, just trying to think of other possibilities.

With a tubed or tubeless tyre?

Oversize C15? A C15 is 67mm standard bore, but not sure about pin size, piston height etc. relative to the Cub Triumph 500 and 650 pistons will fit the C15, so maybe the C15 will fit the Cub?