Hey everyone. Everyone talks about which motor kit is superior. Imo theyre all pretty much the same, and the performance and longevity of your motor will be based on how you initially build it, and how you treat it afterwards. This is a flying horse motor from bike berry, and let me say they are not worth the extra money. Their customer service has been appalling, and the motor they sent me is pretty crappy. Im not at all impressed. It was clearly spray painted in china with all ports and spark plug holes open (Ive had to clean up the piston and cylinder wall with laquer paint thinner) and then wrapped in brown paper right afterwards as I have brown paper infused into the paintjob -_-.
Anyways, more to the point. Here is what I did. Not wanting to take the clutch and crankshaft fully apart to open up the crankcase. I decided I would just clean it out with fluid. What is in that cream cheese pot you may ask? Is it oil? No. Its wd-40 which is supposed to be clear. I filled the crankcase full of WD-40 as its a cheap lubricating cleaner i have around the house. I span the crankshaft around over and over to make sure the WD soaked and cleaned everywhere. When I poured it out back into my container, it looked like this. Although you can see it in the pic, there was a large amount of metal dust and fragments in there. I would strongly recommend you do something like this to try and flush out your crankcase when you first get your motor. After the first crankcase full of WD40 I filled it again with another WD bath, and this WD came out mostly clean. I then used some 5w20 4 stroke engine oil and filled the crankcase with this, moving the crankshaft around to make sure it cleaned everywhere. Then i dumped that back in to my container. Leaving my crankcase much cleaner and with a good film of oil over everything for when I first start it. Also, when I took the cylinder jug of my engine, I did not leave it open. I covered the open studs and piston with plastic sandwhich wrap and an elastic band. So im reasonably sure that the metal dust and dirt inside there was not from me, but infact from the factory.
Anyways, more to the point. Here is what I did. Not wanting to take the clutch and crankshaft fully apart to open up the crankcase. I decided I would just clean it out with fluid. What is in that cream cheese pot you may ask? Is it oil? No. Its wd-40 which is supposed to be clear. I filled the crankcase full of WD-40 as its a cheap lubricating cleaner i have around the house. I span the crankshaft around over and over to make sure the WD soaked and cleaned everywhere. When I poured it out back into my container, it looked like this. Although you can see it in the pic, there was a large amount of metal dust and fragments in there. I would strongly recommend you do something like this to try and flush out your crankcase when you first get your motor. After the first crankcase full of WD40 I filled it again with another WD bath, and this WD came out mostly clean. I then used some 5w20 4 stroke engine oil and filled the crankcase with this, moving the crankshaft around to make sure it cleaned everywhere. Then i dumped that back in to my container. Leaving my crankcase much cleaner and with a good film of oil over everything for when I first start it. Also, when I took the cylinder jug of my engine, I did not leave it open. I covered the open studs and piston with plastic sandwhich wrap and an elastic band. So im reasonably sure that the metal dust and dirt inside there was not from me, but infact from the factory.
Dw guys it worked out fine, didnt take of to much material just drilled the holes a few mm deeper and widened the out. Keep in mind I dont have a shop. My garage is filled to the ying yangs with old stuff from 18 years of my family living here, and my back porch had a nice uninviting layer of snow on it. Soo I busted out the power tools and the vaccum cleaner and worked on installing all of the new hardware and my noise deadening material things for inside the 3 covers, while my buddy worked on getting the sprocket aligned and then the back wheel back in to alignment with the bike. It was a productive day 
