Just wanted to see if other yzf 450 guys have had sand issues. Specifically I wonder if sand can get sucked up the engine breather hose. I road sand this year for 3 days. Changed air filter 2-3 times a day with a good grease beed around the rim plus outer wear prefilter over all that. Never saw a grain of sand in the airway leading to the carb or in the carb itself. Took bike in this week to have valve clearance checked and they tell me I need a whole new engine because it's full of sand and everythings been blasted. Then they start lecturing me about air filters etc. I maintain my bike great, oil changes out the ying yang and air filter is never dirty and carb is clean. Is it possible to suck up a gulp of sand through the breather hose? That's the only thing I can think of. If so nice design flaw Yamaha. My bikes probably got 30 hours on it and Yamaha doesn't even sell complete motors. Over 3000 for a rebuild.