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My Optima Mid seems to build up speed slowly and struggle on grass although top speed is very quick. If I hold it still and accelerate gently the the motor and pinion are turning the gear but the belt is not moving. It feels like a slipping clutch on a car. Does anyone know what can cause this and how if at all it could be adjusted or if not what may have gone wrong?

So I always wanted a Optima Mid actually since back in the days. Even dough I can remember that I never understood the others how they could consider anything else than Tamiya. But this car is such an awsome buggy, it got the right look and some very nice decals. That said, my Optima Mid is no looker, but I hope I can turn it into an nice survivor car. I have disassembled the car, so that i can wash all the parts. I have already bought a new body (TBG) and decals (MCI Racing). I guess I could just have painted and applied decals to a new body and added some new tires, and this one would have looked stunning on the shelf, but I can’t just get myself to take such an short cut.

Optima Mid survived 30+ years. What are my options?

Just looking at what's going to be coming out again this year: BigWig Top Force Avante 2011 (Again) Schumacher CAT XLS and I wouldn't fall off my chair in amazement if we didn't see a variant of the Optima Mid being released either as the pro was released last year and the MIDs arch rival the CAT xls is making a comeback. It's going to be a year of tough decisions ............. If I had to pick one at the moment, taking into account cost, it would probably be the Top Force, or the Mid if it appears, what are other peoples thoughts ?

4 Kyosho wheels in very good condition. I do not know exactly for which model they are but google says they are for the Optima mid but do correct me if google was wrong. They have tires on the them but 2 pairs of different ones: 2 tires are kyosho Sand Super 320/30/20M bridgestone and 2 tires are unknown to me but bear an AE-logo and the inscription TO-20 "made in Japan" and have a block profile. All 4 tires have been used and have wear but still very good profile. PM me if you are interested.