I have a new old stock Horstman Manufacturing torque converter clutch that I plan to mount on my Speedway. It's very similar in outside appearance to the Comet drivers. The main difference is the Comet has 2 rows of small springs around the center hub and the Horstman has only one row which is actually 2 large yellow springs hooked together. Here's the problem... After mounting the clutch and starting the bike, I couldn't get the clutch to engage. The springs are so heavy that you have to be almost full throttle before the clutch starts to engage. My guess is that these springs were for karts or bikes with a 2 stroke, not a 4hp Tecumseh. Does anyone have any experience with one of these clutches or know where I can get lighter springs? Bill