I haven't spent a lot of time with this so I'm not certain what the issue is. I thought I'd toss this into the ring to see what happens.
I run, now and again a hybrid ( frankentank? ) KV-1. Mato upper, Asiatam lower with Asiatam road wheels. Mato tracks I believe if I remember correctly I
used Mato's tracks and Mato's sprocket and idler. I used the sprocket as it fit the gearbox shaft; I don't believe I'm using some other sprocket.
The issue is that even in a straight forward run the right hand track will jump the sprocket; not if just when. Even on a hard smooth surface. In reverse
it runs true and
never jumps the sprocket even in loose dirt with the track jammed full of dirt- it's clearly not a happy tank but the tracks stay put and
the model toughs it out impressively which is what I was shooting for. I have Mato ( brass) gearboxes with speed reduction to give me power. And that works exactly
as I hoped. Slow crunching power- as long as I don't go out of reverse. In forward after a few feet out it comes.
I think I bench ran this thing with the gearbox running from an external power supply directly and while the sprocket might lose the track momentarily it pops back in;
I think that momentary situation turns permanent while actually running.
The sprockets both appear to run true, I believe the center line of the sprockets are where they should be. I've never modified ( sharpened? ) the sprocket teeth
to see it that has a positive effect.
Just curious if this is a artifact of the KV1's semi dead track ( my Tamiya Pershing rarely does this neither did the first T-34 I ran ) which I keep on the loose side; is there an issue with Mato KV tracks or is it that I need to research this more? Other than this bug the KV-1 is slow, powerful and deliberate just as I intended.
Jerry