Here are the allowed engines for CSC Junior 1:
This class is for drivers 8-11 years of age running 4-cycle engines. Stock Briggs flathead (methanol), WKA section 701 – exception-billet rod allowed-must be stock length. 240 lbs., Stock B&S Animal (Gas) WKA section 708 exceptions – must run “broached stock factory camshaft” NO grinding of cams allowed. 240 lbs. 80cc Comer engines (Gas) WKA section 611-exception-can run pipe, 220 lbs. Open clutch. Allowed tire compounds are Bridgestone YHC, Dunlop SL-4, Vega Red, Burris M30, MG Red, Maxxis HG3, and Maxxis HT3.
and…
Races will not be run in the rain except at the finale event in Steamboat Springs. Shifter classes will use SKUSA tech rules, TaG classes by TAGUSA / SKUSA tech rules, and the rest (4 cycle, Junior 1, Junior 2, and Kid Karts) will use WKA tech rules. Any exceptions to these rules are stated below.
CSC looks to WKA for Junior 1.
Some question came up this last weekend about Rotax Mini max in Junior 1. While GJMS allows these to run in Junior 1 (there were 3 of them), my understanding is that they won’t count toward points in the CSC series.