Suup guys, just wanna give you a heads up on the toomey spark arrestor v.3. I installed these and ran them fine for a two day trip. The thing is that I recommend u service them after every trip. I went ridding sat may 29 and hadn't serviced them. 30 minutes into the ride I began to feel a loss of power in the top end. I ran for maybe 5 more minutes and the power loss became more noticeable so I decided to head back to camp. Maybe 2 minutes on the way back the bike felt totally trashed. It wouldn't rev into the power band, not even fast enough to ride in second gear, I barely made it up the trails and had to be pushed on one. Those 30 minutes out turned into over an hr trip to get back to camp. I cleaned out my carbs, changed my plugs, syncd the carbs again, my next guess were the arrestors but unfortunately I didn't have the tools to pull them out so I had to call it a day. I thought I had blown the engine but when I got home I took the sparkys out and replaced them with the stock silencer caps and shee was runnin like a champ again. All the carbon buildup in the screens ruined my day out so word to the wise, clean your spark arrestors.