Most disappointing bike I've ever ridden was a Gen1 Ducati Diavel. Only Ducati I've ever ridden that needed significant counter steering effort to get it round bends. Glad it was only a short test ride & pleased (= relieved!) to hand it back to the dealer.

Can't really answer the most horrible bike i acquired was a Victoria Swing two stroke and a press button gearbox that was a long time ago the most liked the Honda Pan European comfortable quiet good brakes and good at low speed filtering easy to put on centre stand
The Hinkley Triumphs were good as well

“worse than a worn out, old, pre-unit Triumph Thunderbird“

That bad eh,
T

"fell off when I tried to steer."

So you failed the audition for Easy Rider then 😁

A65bill ,this one(the z900) tried to kill me last year but one

the carbs were well out , 4 dofferent "specialists" had charged my mate almost a £1k to sort out
I bought 4 rebuild kits from nrb in manchester , a specialist recharged for douing them , they were still bad , in the bag of returned old carb bits were the needkle guides , 4 of them brand new , not fitted coz "they dont wear out",they were that bad , you culd slide your dick up the side ,, not sure of name , brass pushed into alloy and the needle slides up

bastard of a job as it a bar at top for sync , used the 6mm drill trick , tightened then lovered tickover
also sorted ign , the had cut ends off ht leads that were carbon string

I came up the hill passing haughton towers , sort of flat in I think 4th,(it was fast) and it decided to tell me who was boss

when i did get back , i removed the tank and seat and spent ages looking for the hindge
even if one came up now at right pric and I was fit to ride , the answer would be no , the dammed thing took 20 yrs off my life

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Not mutch wrong when you've owned it for over 40 years and been around the clock twice worth thing was me starting it up reduced the value only three in existence 😉