Wheaters wrote: ↑Mon Mar 16, 2020 1:29 pm
Which trial was it? Well done on having a go.
My attempt at the MCC Edinburgh Trial was a disaster. The bike attracted a lot of interest among other competitors and one rider asked me what my bike weighed. He told me his new Beta weighed only about 60% of what mine does! The big advantage there is that a lighter bike is far better on hills; less likely to suffer wheel spin.
Not forgetting he was probably a far better off-road rider anyway!
It was the Durham Dales Long Distance Trial with the Middle-England Classic Vehicle Club. Yes, most of the competitors were on much more trials-specific machinery, although there was a C90 and an SS90 with a pitbike engine. One brave soul took a standard RXS100 on road tyres but his clutch bombed on one of the later sections. Quite a bit of classic brit iron too, a matchless and a couple of ex WD BSAs.
I'd be interested on hearing from someone who's done this and one of the MCC trials to get an idea of how the sections compare. Some of the ones on this were more akin to what I've seen on "proper" trials.
I did refuse two sections which started with a long, very steep straight-drop down into a quarry. I decided it went well beyond pushing my limits and into the realms of pushing my luck. It would not have been a controlled descent, it would have been a slightly slowed-down crash while hoping the bike got to the bottom before I did. Happily, other competitors agreed this was a good decision.
Yes, wheelspin was my main issue, a combination of too much weight and not enough tyre.
Gearing too. it really does need lower gearing. One section was a straight climb and I ran out of puff less than half way up but I don't want to go the gearbox route becauase I'd like to use the bike for road trips too. I've got a spare sprocket/drum so I've just ordered some blank sprockets. I'll get my local light engineering guy to turn the teeth off it and make me some bolt-on gear rings.
Presto wrote:The Concentric Mk 1 carburettor was designed to operate up to 30 degree off the vertical, (though some suggest 40° and others 20°. I guess that the Mikcarb would be similar. Maybe your angle of precipitation exceeded that.
I just rotated a picture of a bullet 30 degrees and yes, almost certainly was a fair bit more than 30 degrees momentarily, especially since I have over-standard shocks to start with. The bash-plate certainly came into play on one of them.
I'll check out the electrics and I'll check the float height but the solution may simply be lower gearing/more revs to carry me through any momentary dead-spot.
I'm toying with the idea of making up an alloy manifold with a slight angle on it so the carb slopes down slightly. Similar idea to the one our hosts make for attaching a big amal to the 500 headss but with a slope on the carb side.