Hi AVB, I know about these model numbers but they are usually too hard to read. It hasn't done a lot of work these little 16 inch mowers never seem to do that much going but external appearances. It is a vane type and everything appears to be functioning as it should. I usually find that this problem is in the carby and with a few revs and hand over the carby they usually clear and settle down. This one didn't so I fitted another tank and carby but that made no difference
