To hijack this thread slightly. I got a couple of gravel hounds of Ebay a couple of weeks ago, both had rear tyres perished but other than that in working order. Tyres arrived yesterday and I had new bearings for both so set about getting them running today.
First car no problem but the second one I'm having trouble with. When I push forward or back I can hear the motor revving however the wheels hardly move, the car jolts forward and backward intermittently.
Took it slightly apart and exposed the motor, if I run the motor on it's own with no other cogs attached it runs freely as it should, however when all the gears are in situ, nothing really driving.
Didn't get much time to look any further into it as I had an anxious 10 year old waiting to have a go of the other car. Any ideas what to look at before I start pulling it apart again?