Your opinions

Kinda ....asking how long is a piece of string here I know , but hey the answer is out there!
Drove my daughters Jimny today a 54 plate cabrio so G13 engine..
It starts ticks over absolutely no problems straight away even tick over , however it seems very slow on acceleration almost heavy! It speeds up getting to speed rather than SPEEDS up , if you get my drift....top speed seems to be 60 ish according to Tam ( the owner.) I wouldn't know the weather and lack of lack of Tarmac not acting like a flood plain hindered my testing of this.
The steering seems heavier than mine ....the brakes seem to work fine. Though she says it wobbles a bit braking from 50 mph.
Sounded heavy also.

Apparently the cam belt was changed recently , the airfilter is clean and is the oil filter, indicating fairly new.
My thoughts are possibly , brakes binding, fi system though not sure what, check diff oil levels just to elimate that . Could the timing be out slightly? Old air cooled motorcycles you have one tooth out and it'd run fine but lack power.
Thoughts please, before she visits her local mechanic chappie.

Yeah, I'd check for binding brakes 1st
Timing belt timing next.
Might want to check spark plug gap is correct if they have been changed.
Have a look/listen for air leaks from split vac pipes, flattened breather pipes etc.

Rear silencer/back box collapsed internally

Sounds gas- flow related. Sooty plugs intake side, clean plugs exhaust side.
Given that it runs clean but is sluggish it could well be the exhaust.
Chris

Thanks for the Imput, the info was passed on and we'll start with some catacleaner as it can't harm.
When we know so will you.!

Is the steering driven from the vacuum? If so, this might indicate an inlet problem. The steering might be a red herring, apparently how heavy it is varies a lot.

I would check the plugs, they will tell if it is rich or lean.

Timing, was it sluggish before the CAM belt was changed?

It could be a brake binding, that might make the steering feel heavy. If you get up to speed, roll the throttle off and push in the clutch does it slow down quickly, like it's been braked?

Only other thing I can think off, it isn't staying in 4x4 is it? I don't know enough about how the vac hubs work to know if this is possible, but that would certainly make it feel heavy.

Some good thoughts here, But for now we went for easy option as she( daughter) lives in the oolu.
Anyway put catacleaner in and tank of fresh petrol and it ran better , but it seems when the tank is full it runs better, but 1/2 tank area back to sluggish.....
If it was a vent problem it would misfire or stall.
Fuel filter? = pressure.

Is the tank breathing properly? Could be the EVAP cannister, if you can vent the tank with an old fashioned drilled fuel cap ( or some other unmentionable method) that might give you some indication.
Chris

Maybe you could try to open the fuel cap every 60 miles for checking if it is an underpressure in the tank.