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Whats the accelleration/ handeling like at 492cc?
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I wish I could tell you. When I first owned it, my 3 cylinder (492cc) broke the differential mount before I could drive it enough to find out. I now own it again but it needs restoration before I can drive it. That's in progress now. It's the same car as the 2 cylinder 328cc, so the handling & brakes should be similar. Cornering ability is very good on smooth roads. The steering is good, but the Burman box isn't as responsive as the rack & pinion common on small cars then. The brakes are not like any car I've driven. The car just stops instantly. Heavy braking is exciting, since the rear end with driver aboard probably weighs about 325 lbs. You don't worry about pull to the left or right, you worry about swapping ends.
On bumpy roads - 12 inch wheels and a 700 lbs car. You can imagine...
Acceleration in the 3 cyl is of course better than the 2 cylinder, but it won't worry most modern cars. I suppose a 3 cyl will do 0-60 in 18 seconds or so. The 2 cyl takes longer but they're so small that it feels much quicker.
The Royal Enfield powered cars were much faster accelerating, with 0-60 in about 13 seconds. A lot depends on driver weight!
Earlier today I looked at a Royal Enfield powered car on one of the "racecar for sale" sites listed at $38,000. Maybe Berk values are rising!