@SPOOKSTR - Just because it's a 2 stroke doesn't mean it has to so highly tuned the rider ends up feeling it's like trying to ride an electric light switch where it's either on or off. After all many excellent trials bikes are strokers. Generally the larger the capacity the softer state of tune you can have to make it more drivable. Smaller capacity 2 stroke engines used on the road tend to be more highly tuned but then they make less horse power. So it tends to be "horses for courses". I had a Beckett tuned Yam 350LC with his pipes & because every one else wanted a "wheelie machine" the choice was take it or leave it! I didn't mind it "coming on the pipe" strongly as I knew that was @ 7.5K. The problem was even in a low 1st gear it stalled @ 3K as if the ignition had been switched off ! Fortunately a couple of minor upgrades solved that - 1) I changed from stainless steel reed petals to fibre glass 1s to give better long term protection for the engine - & @ that time the word was glass fibre petals worked better on tuned engines. 2) Fitted a "boost bottle"/ Helmholtz Resonator which changes the fuel-air mix from a too rich-too lean sine wave to a straight line gives cleaner carburation & about 10% better fuel economy! Put together that stalling @ 3K was gone & out of curiosity in top gear & applying the brakes I could force it down to 1.8K revs! Forward progress @ that point was fairly meaningless & to get reasonable throttle response I had to drop 4 gears! The power hit @ 7.5K had disappeared & was replaced by the pipes starting to "cackle" @ 5.6K revs, as the gases in the pipe started to resonate. - I hate to be a boring sod but this set up without the high drama & being more user friendly was actually faster as the response @ the rear wheel from the throttle input was linear ! :)

+Alan Eccles I agree, did you notice the chair wheel had a steering link?

+rob the log I saw the side wheel linkage. I've only ever seen one other like it built by Ian Kirk Engineering in Aberdeen in the early 80s - also with TZ750 power. Driven by a very brave Peter Greig and even braver passenger Rudi Elmquist - it was the original "worm"

+Alan Eccles Yeah, I'm still scratchin' me 'ead over that front end though, I imagine you'd get a lot of torque and bump steer, is that the case?

+rob the log Terrible bumpsteer - I just couldn't dial it out. My chassis was designed by a Formula 3 car engineer who thought he could just "take a wheel out". It was also a short wheelbase so it squirmed everywhere. I sold it, mainly for the Denis Trollope TZ700 motor but the buyer decided to long wheelbase it and turn the front round 90 degrees but tragically he was killed in a big off in the mid 80s

+Alan Eccles Yeah I sorta thought it'd handle like a dog on a tiled floor, I just can't workout how this is a good set up. that's very sad about the bloke that got killed, but that's the very nature of chair racing. Cheers to ya bloke, Rob in Oz.

John Warner I had to go back & see because at first I thought, WTF? But it sure looks like it steers! I've never heard of any side hack w/ that feature, I've even got seat time on a road race sidecar Kaw 1000 & still never heard of this kind of set-up. Never the less, they're beautiful though & a couple hot laps on one would be great!

+John “Doc” Warner these are older if they had two wheel steer this was banned along with two wheel drive they also dropped from 700/750 cc to 500cc Krauser engines making about 180hp

Oakley Gascan ;) !

Finally someone who isn't a complete moron!!

Actually it is a TZ 750 engine :-)

yep

R188S , loved the smell of em at the track!

I also thought they where 500 cc,why dit they put 750 cc in there.or is this just a project. 750 cc two stroke is of limits???

the TZ engines 750 engines , can be fitted with 2 pairs of 350/250 cylinders and piston , making a 700/500 engine . the 700 has more torque and 500 can use powerjet carbs ( this was back in the early eighties when i was spannering for a sidecar team )

@@BigBadLoneWolf But only the TZ700/750 cylinders use reed valves

I think these are yamaha yzr500