2stroke4stroke

We could have chatted about this tomorrow at Belford Baldilocks but as there is now a trial half an hour away from the house I won't be venturing south after all. Your experience shows that the Sherco wheel can be fitted to several bikes thus answering the OP's question and you suggested, quite reasonably, that it might also fit the Montesa. The only reason I said anything was to avoid any Montesa owners obtaining a Sherco wheel then finding it was not a straightforward fit, not to hijack a thread or start a disagreement. The guy with the Sherco wheel told me that the distance between sprocket and disc on the Sherco was 145mm; I can't confirm that distance. The same measurement on the 4RT is 140mm. The defining factor on wheel spacing is that the caliper, which is on the right hand side of the bike, has to be hard against the swingarm in order to locate on the anchor tab, which also determines where the disc has to be. If I fitted the Sherco wheel then the sprocket would be 5mm too far to the left, which can't be sorted with spacers. The only solution would be, assuming there was enough meat to do so (there definitely won't be on the sprocket side of the hub), to machine 5mm from the face the disc sits on which probably means it won't be a cheap wheel for anyone after all. Who knows why Montesa use a different width of hub from the others but it is a problem for owners who just want a reasonably priced spare wheel. I hope that explains things it not being feasible to put a sketch on here.

I know computer guys who have used fan motors from IT equipment on various vehicle cooling applications. Apparently the (entirely unnecessary in the UK) Mini oil cooler motor is very badly placed and gets a lot of dirt thrown at it.

The spacer wasn't the issue but the width of the hub (ie distance between mounting faces of disc and sprocket). The sprocket would have been 5mm out of line.

If you get the sizes then you want to be going to a bearing supplier, not a bike shop. Good quality bearings can be obtained at a reasonable price from suppliers through the net. Names have been mentioned on here in the past so a search might bring them up.

I e-mailed them when the trousers first came out and got a prompt reply and they indicated they might be looking for a UK importer. Trousers seemed good but too dear to be shuttling them across the Atlantic to establish the right size/fit.

I considered a Sherco wheel for the 4RT but the distance 'twixt disc and sprocket was 5mm too great.

Approximately once per revolution, in effect.

Personally, if I were doing this I would use the trials ratios as a means of being able to raise the overall gearing to give a more sensible top gear which seems to be what the 4 Ride lacks. I understand it is the same as the 4RT.

I have a pair of wheels less brake plates if he can use those Murray.

100:1 is actually richer not leaner "in jets" ie you are putting less petrol at 50:1 into the motor than designed but how it would equate to jet sizes as you are trying to compensate for I don't know.

As far as I was aware, Derek Elwell Products had no connection with Walker Exhaust Silencers.

I'm assuming you are in the UK. If the dealer won't comply with the rules (and I'm not sure of the detail about paying for sending back) then contact your credit card company if you used such.

Aye, and are you taking their advice to change the piston every year? I think there's room for intelligent judgement on oil changes - does the 4 Ride manual call for an oil and filter change every two days I wonder. Which could equate to the 4RT requirement.

I believe there's one the first week in May somewhere in Lochaber ☺

As above there's barely any oil in there but it seems to do the job. Whilst it looks clear as it comes out, if you collect it in a transparent container then it looks much dirtier. Part of that is because you leave a quarter of the total oil in there and it immediately starts contaminating your fresh oil.

The multilap thing came in with a vengeance when the ACU barred events using more than one piece of ground during the foot and mouth epidemic of 1967. The remaining road events were, if I recall correctly, pretty well killed off by the oil crisis of the early 70s when road use for motorsport was effectively barred by the government. Once they discovered that they didn't have to tax their bikes for these pocket handkerchief trials, as they were referred to, after the ACU relaxed the requirement to do so then trials riders were happy not to register them at all which destroyed entry levels for the few road trials left.

Well it always worked for Doug Domokos.

Michael's pictures are of the new model which is longer than the one in which two bikes will fit so should be no bother.

Interesting issue under UK consumer law if sold as suitable for use in WTC but evidently not fit for purpose ☺

A waste of time as far as salt goes - too much left exposed. I had a sail maker convert a bit of tarpaulin I had to cover the whole bike, with a separate one for the forks and front wheel. Full coverage worked well.

Yes. But I have seen somewhere a mod to the generator to allow a lower tickover to be used. I think it involves spacing the coils at a different relationship to the magnet. School physics lessons are too far back now for me to recall how/why this would work. But I have not heard of anyone using the mod. If it was that simple I would have expected Honda to have done it.

Friends have travelled extensively all over Europe and Scandinavia with three Pre '65 scramblers in a Landrover so a trials bike should be no problem.

If you look down from your high horse Canadaler you might spot that pschrauber is not a native English speaker and that you have placed an unjustified interpretation on most of what he said.

Interesting. Keep us informed.

I have spacers that someone had made up. These replace the standard wheel spacers but flare out to the diameter of the bearing with a very slight shoulder to give turning clearance. They should largely prevent water etc reaching the bearing, particularly for those washing a bike carelessly. Too early yet to tell if they actually increase bearing life. I would have thought that the rings you mention won't make a big difference under trials conditions. No matter how fancy the rings the dirt is still going to be "forced" against the sealing edge and ultimately beyond it.