Now available for Sherco 250/290 in cool Blue colour... Various inserts available for different results. If you want fairly flat power for beginners or for really slippery conditions then you would set the bike up with a "low" compression insert. If you want to keep the bike standard, order the "standard" insert. If you wanted a more aggresive power setup, or you are going high in altitude then you could experiment with a "high" compression insert .... The inserts can be purchased here http://www.trialendurodirect.com/products
/S3__STARS__Cylinder_head_inserts___770.html