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I think what you are saying is that the throttle doesn't stay in the open position when you pull it back. This was happening on my 335. I got one of those plastic friction pieces from Welters. 417-498-6496. On mine it turned out the roll pin in the plastic had sheared, allowing it to turn on the shaft. It was pretty well worn too, so it was time for the new one anyway. To get at it you will have to remove the top and right side of the hood. I was able to fix mine without removing the tank, but the clearances are tight and the arm at the bottom of the throttle shaft is cast and could break, so it might be best to remove the tank. The tension spring has a washer and a cotter pin through the shaft below it. You will have to remove that cotter pin too.(I think-it may be another roll pin.) You will have to remove the arm pinned to the lower end throttle shaft. It has a roll pin through it that you will have to drive out and in my case it was rusted pretty tight to the shaft so it took some working to get it to slide off the bottom of the shaft. I am thinking that if you turn the steering wheel to the right place, the throttle arm will slide up and out between the spokes. Then of course, you reverse the procedure to reassemble it. One thing I did to mine was to add a 7/16 shaft collar to the top of the shaft above and against the friction piece. That way the roll pin in the friction piece doesn't have to take all the linear force of the spring as well as the twisting forces that are applied to it.
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