V FORCE 4 REPLACEMENT GASKET YZ65 18-ON YZ85 02-ONV Force 4 Replacement Gasket Yamaha YZ65 18 On YZ85 02 On Each time you inspect your reeds for wear (which you should be doing twice a season) you should always replace the gaskets to make sure the seal has not and will not be compromised. Always replacing gaskets is cheap insurance against air leaks which can ultimately lead to severe motor problems such as sucking dirt or an extremely lean condition.