Yamaha F20BMH revving moving very slow

[Jackeethor]

Hi There

We have the Yamaha F20BMH on our tender, we were in it the other day as normal, then whilst travelling it just slowed down, and started revving high, but not moving like it should. It seems the clutch is engaging because when you engage forward it moves forward, but very slow and when you give it some throttle it rev's like hell but doesn't go anywhere. Same as when trying to go in reverse, it just doesn't seem to have the power but it will move in reverse just slow. Like i say the engine is revving but not moving fast, any ideas what could be the problem? Is the clutch not engaging properly?

Help would be very much appreciated.

[pstephens46]

Examine the hub of prop. You probably have what is called a "spun hub" There is a rubber sleave as part of the prop hub. It can be damaged or stripped allowing the prop shaft to spin while the prop itself barely moves. Especially at higher rpms.... Google it for images....

[Jackeethor]

Examine the hub of prop. You probably have what is called a "spun hub" There is a rubber sleave as part of the prop hub. It can be damaged or stripped allowing the prop shaft to spin while the prop itself barely moves. Especially at higher rpms.... Google it for images....

Thank you mate, does seem to be the problem, replacing the prop as we speak

[99yam40]

prop shop can repair the old to keep as a spare