Your just plain out of luck trying to get a Grubee 4G kit right now. They were supposed to be back in stock at the end of April (that deadline came and went) Then it was late May and (that deadline has come and gone) now the rumor is maybe late July? Over at bicycle-engines.com (sole US Importer of said Kit) they are not even stating a date for receiving a shipment? They have a link to a News Story about how there is a major shortage of workers to build/make things thru out Chinese Industry. I have a feeling that it might be awhile longer before these kits get to our shores. So if you need /want a Quality 4-stroke kit to mount in the frame of a bike, You need to look at the EZM Kits. They are more expensive than the Grubee kits but they are currently available and most folks that buy them seem to be very happy with them.
ocscully