Engine Bogging

[oldgold70c10]

Some other things you might want to check- PVC valve and crank case breather, if they are leaky, they will cause vacuum leaks. Check the little diaphram (vacuum break) that connects to the choke lever (manual choke carb may or may not have this) and the hose attached to it, if it is leaky, you'll have vacuum problems. Sounds like you may also have insufficent feul delivery, since it runs fine either in idle or with the choke. Did you check the float level? It might be too low, clogged or wrong feul filter or bad pump. If you disconnect the feul line from the carb and crank the engine over 1 or 2 turns (be careful doing this and don't let it start) you should be able to see gas squirt out the line. If it does your pump is OK, check the filter and the float level. I doubt its the power valve unless it look damaged or pitted, or something else obvious. Do check the spring loaded plunger in the top half of the carb that pushes on the power valve, it is easily damaged.