Triangulate the measurements. For ease of writing
FL = Front Left FR = Front Right RL = Rear Left RR = Rear Right
You seem to have measured FL to RL and RF to RR
Now measure FL to RR and FR to RL
You will have to remove the seat to do so but... The combination of measurements should show you, accurately, the true situationwith the chassis.
A chassis could have been 'shortened' on one side by a heavy impact on the front stub axle. They may have replaced the stub but not 'jigged' the chassis. 3mm could indicate quite a change in Handling.
With the seat out:-
1) Put the chassis on a stand 2) Put a straight stiff bar on the chassis so it touches the same point on both stubs 3) Go to the front of the kart by at least (let's guess) 6ft. 4) Now lower your eye-line so that the 'straight bar' aligns with the top of the rear axle 5) If it doesn't sit at EXACTLY the same angle as the rear axle, the chassis is twisted as well as shortened...... so long as you have ensured the straight bar is sensibly place, of course.
Weigh up all the measurements and 'sightings' and then consider the cost.
Ian
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