I have great memories of watching Bosis's flamboyant style in the '80s & '90s.
The fact that he rode like this on those early aprilia's made him even more of a legend in my eyes!
He was my favourite rider, i took the opportunity to accost him for an autograph through the open window of his caravan at the 89 world round, he laughed & signed my programme even though he was only wearing a pair of Y-front underpants at the time!
Hi Rock Hopper, in the tl125 the bolt has a left hand thread, so to unscrew you must turn it anticlokwise, similar to the nut that holds the centrifugal oil filter. I
Got electronic ignition on the 320TL, the advance curve makes a hell of a difference to the power, if Woody is on here he can tell you his view as he tested mine before & after.
If i remember correctly, we disconnected the scavenge valve & blanked it off. I didn't like the idea of fuel (or more likely, oil that gathers in the bottom) being fed back to the carb.
The best mod though was to raise the barrel 2 or 3mm, on the 240 engine this allowed the exhaust port to be fully uncovered, the bike revved much better after this.
You asked what year the bike is, all 3 replies tell you it's a 1991. It can't be newer as they were a different shape, it can't be older as the previous 2 years didn't have the stainless front pipe yours has. Also yours is the original '91 green with white mudguard.
In my experience, problems arise when a course is set out too tight to ride without having to move front/rear wheels sideways to make the turn.
Quite often (as said above) an observer will allow a momentary stop but this favours the better riders as they are more capable of giving the perception that they are keeping the bike moving (by using a more fluid technique of hopping if you get my drift)
At first, i was in favour of no-stop, but recently i'm not so sure as stopping seems to be allowed most of the time and sections are still laid out too tight to be ridden conventionally.
Bikes of this era usually ran on 50:1 mineral or semi-synth, i have no personal experience of this particular model, but i have run air cooled SWM engines at 65:1 fully synthetic for over 15 years with good results, low smoke and low wear rate. I consider this ratio to be on the safe side, i'm sure 75:1 would be fine also.
This question comes up time & time again, the general consensus seems to be that most folk run between 70 - 80:1 using a fully synthetic oil.
"dadof2" doesn't take into account that trials bikes simply don't generate the engine speeds or heat to burn off the very excessive oil ratios which he is quoting. You will be unpopular at your local club if you run so much oil that you are smoking people out in the queue for the sections not to mention you will have to clean out and re-pack your exhaust constantly.
When Sections Were Proper Sections?
in World Championship Chat
Posted
Great vid, love the style of Bosis, such a shame at a young age.