When a JTG track on older carpet starts to get hot > 70 deg and has a lot of compound worked into it, it starts to get gummy and clogs up the higher rubber content foam tires like CRC Mag and Pinks.

This issue won't be as bad on new carpet which is why at most big races it's not an issue. If anyone has gone to IIC i believe this is why Scotty keeps the room cool.

Switch over to CRC Gray or Black front's and yellow or gray rears, you should be good. Gray\yellow do wear fast but that's the price we pay to be fast.

Cleaning the track will definitely help the problem for awhile. If the carpet gets run on a lot with foam tire cars it will start to happen again in about 4-5 weeks. Our local track cleans the carpet every 8 weeks, which is a blessing that they take the time to do this as during the summer it makes for a much better racing surface.