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990 Adventure VS 990 Supermoto engine

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So I recently destroyed my 2010 KTM 990 adventure engine (at least a cylinder and head) and it was easier to buy a new very low milage 2010 990 Supermoto engine to replace it with. I did a bunch of homework and verified the gearing is the same, the fit is correct, etc.

Couple of differences I came across and I am wondering if anyone knows why.
1. The spark plugs are different size/model. Yes I even googled it, the SMT does takes a different plug. Why?

2. The front valve cover on the adventure has 2 oil lines connected to it, the SMT has 1. Again, why? I'm pretty sure I will take the adventure valve cover and put it on the SMT so I don't have to drill holes to customize it.

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