Thanks for the reply. I received my engine today and I'm still not sure what I really have. From what I gather, the sticker on the side of it say it's made by JiangYan City YuangDong Gas Eng Factory. Another rivited on plate says it was made Jan 14, 2009 and is distributed by Gasbikes.net It does have the big Grubee label on the right hand side of the engine. But, is it really a Grubee ? I bought it off eBay form Noationwide Access. The description on their eBay auction definitely does not match the engineI received. It came with a 44 tooth sprocket rather htan a 50 tooth, which is what I wanted. Crappy non bearing type chain tensioner. I wouldn't consider the least bit at using that thing. It also has 90 degree plug insteadd of 45 degree. I think a lot of the eBay people don't know squat about these engines. They're just selling them for profit. You look around and you'll notice that many sellers all have the same photos. Now how do you supposed that happened ? Anyway, I don't know to much about these things yet. That's exactly why I joined this forum after discovering it, and why I'm asking so many questions.
Thanks again !
..... PC .....