the water pump impeller problem is caused by lack of spacers & shims in the Chinese impeller kit
i have made my own spacers so the impeller fist snug without any play with a spacer between the bearings & as MC said pack that cavity with grease
you can also order the genuine blata impeller shim (washer) spacer kit from OZMinimoto & fix it with genuine parts
i spoke with dazza about this a couple of weeks ago & the spacers & seal, bearings are not expensive to go genuine
there is a link to the genuine blata origami manual on the forum showing a exploded view of these parts here is the link
Origami B1 Service Manual
