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Clutch was inspected and rebuilt when I put new spring in. New belt and deflection in spec. Went back to oem spring and will probably just have him get used to it. My understanding is the 340s are supposed to rev high because they are under powered.Looks like the Silver/Gold spring is a much lighter spring (77-240) than the Dark Blue/White (120-310). That big a change is going to make it under-rev a lot and would explain the bogging. Engagement should be just before 4000 on that, but I don't have any references handy. I'd say the Gold spring (100-275) might do what you're looking for, but it could be other issues too. Is the belt in good shape and correct? With the belt and clutch spring removed, does the moving sheave slide in and out freely by hand? Finally, are the weights correct and in good shape?