RE: LOSI MUGGY
Yes, I have a muggy and the stock aluminum clutch shoes suck!!! Right after break in, I pulled the motor and checked the clutch. The shoes were all mushroomed. Switched to mugen carbon shoes and though it might have lost a little punch, I don't want to be changing clutch shoes every couple tanks.
Like many of you said, a big problem with the muggy are the large tires and the gearing. 45T ring gear and a 11T pinion gear this gives internal ratio of about 4.1. And then with the clutch and spur 46T and 13T you get a ratio of about 3.54. This gives an overall drive of (4.1)*(3.54)=~14.5:1 this is too tall a gearing for a truck with such large tires.
I switched over to normal truggy sized tires and the acceleration and clutch wear are much better now!!
Take into account most race truggies have a ratio of 15.2-15.8:1. You can see how much harder the clutch has to work on the muggy.