I've been using tescos finest e10, 50:1 with octane booster in an 1985 rotax with no issues. It does have a modern ignition and newish carb, and runs very well. What problems are you having with modern petrol ?
Compared to discs, drums are generally poor, but, usually more than adequate. They do take more maintenance to work at their best. Twin shocks are slightly heavier, but way more fun, IMO. Costa Brava twin shock trial is next weekend, with several hundred entries, worth considering what the appeal is 😎
@bikerpet in my opinion you need to take @lemurs and @lineaways comments with a pinch of salt. Their views on how trials are or should be, are afterall unique to them. Hearing @lineawaysay he taught his son how to ride expert and move up two grades in two hours... well... thats all i need to know. People pay hundreds of pounds for one to one sessions with world champions!!! and they are barely any better afterwards because of it.
Riding the sections before the trial was common practice for years! In the british championship of all places! You had an hour to ride every section once, you werent scored and you could ride just the one or all of them. Then there was a break, and then you started the trial for real. And no, it wasnt cheating. Just because something isnt done in america, dont mean it doesnt, nor hasnt been tried before. I think you describe something a little more casual, but it worked well in the british championship for years. My problem was, my best rides were always on the practice lap 😕
In the UK, 99% of trials are run on public and privately owned land. It has been sustainable for the history of trials in the UK. And some of the best trials do not have great challenging terrain. It always comes down the to ability of the coure markers and their vision to make a good section from what they have.
This... well i cant do anything but disagree. In our clubs the riders get to know the tough venues from the easier ones. The lower level riders just dont turn up to the tough venues. And the clubs suffer greatly, because across the 4 grades, 50% of the entry is the bottom grade. A tough championship trial you can get 50, and at some lower level trial around some farmers land, ie a few fields with a few rocky outcrops and really basic streams, ive seen an entry of over 180 once.
Sorry, that is an absolutely terrible attitude to have. You maybe dont realise it, but you are undenibaly driving people away from trials with an attitude like that.
IRC front is very good too. (whatever you put on, you will notice a massive impoverishment over old dunlops) As above, tube type IRC rear works well at 5.5 psi.
ATF is Automatic Transmission Fluid and perfect if your motorcycle had an auto transmission with a torque converter and everything is virtually fluid driven. Trials bikes have no auto transmission, no torque converters, what they do have is the same things inside as a farm tractor or heavy construction equipment like an excavator. Hydraulic fluids have a higher operating temperature range and maintain viscosity better than ATF in a broader temperature range.
Agreed, defiantly no gears or clutches in an automatic transmission 😂😂😂😂😂
I am looking for a Service Manual for a 1984 SWM Jumbo 350 TL (or something close).
I need to try to work out the cause of a "won't shift out of neutral" issue.
The link provided by Martin above no longer works.
I'm looking in the Wayback Machine but that URL does not work there either.
Any help would be greatly appreciated!
Thank you!
Scott A.
Indiana, USA
Does it shift easily with the engine off ? If so, probably just clutch drag. What oil are you using, atf improves the smaller rotax's, plus a bit of technique 😁
Defiantly join a local club, Cumberland County would be worth considering, lots of knowledgeable helpful people. Cycle trials skills seem to transfer pretty easily, so should give you a head start in your (evolutionary 😁) process.
Whilst some manual gearboxes do use transmission fluids in place of gear oil, the same cannot be said for putting gear oil into an automatic transmission. Gear oil is much too viscous for these systems and will cause clogging between components.
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Lots of YouTube vids on how to