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Post by 90GTVert on Mar 10, 2017 6:48:20 GMT -5
I'm not sure why they are that way, but some engines just are. The cases can be enlarged with a rotary tool and sanding drums or burrs. The main issue is not getting aluminum bits into the engine cases where they can get into bearings. Some always disassemble the engine so they can thoroughly clean it before reassembly. Others stuff the cases with rags and may even hang or otherwise position the engine so that debris tends to fall away from the cases rather than into them; flushing the cases multiple times after this.
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phatmanxxl
Scoot Enthusiast
Posts: 484
Location: Missoura
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Post by phatmanxxl on Mar 11, 2017 18:56:56 GMT -5
So I was installing a 100cc bore kit on my friends e-ton sport 50. I've done a couple of them so i figure no problem. Ran into a big problem. The hole on the engine is way way two small for the cylinder to fit in. Haven't measured but on a regular 50, the cylinder went in no problem with room to spare. Why is the cylinder hole on engine so small on this one? Can I open it up without a bore tool? Looks like plenty of room to grind. I have the same scooter, I had to machine down the 80cc BBK down to 49mm OD to make it fit the hole. I took a risk making the sleeve thinner but it seems to hold up well. Yea boring the crankcase is basically your only option with a 100cc. The bore hole stock is 50mm wide. Eton uses Sym engines and they like to be different than your typical 139qmb. |
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Post by joshua864 on Mar 11, 2017 19:06:46 GMT -5
Taiwanese 50cc need to be bored where as the China stuff doesn't.
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Post by ThomasTPFL on Mar 12, 2017 1:39:39 GMT -5
Ain't got no experience with this but hotrodder trick for opening up intakes is to fill the tract with shaving cream and vacuum it all out when done with the grinder
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