Air from oil fill hole when engine running

I never removed the oil fill plug while the bike was running before but I just did after putting on a heavier flywheel weight. Is it normal for their to be air "puffing" out of the hole, almost seems like blowby. This could have been happening for a long time but I wouldn't know because like I said above I never took it off. Thanks for any replies, and corrective actions if it shouldn't be doing that. Thanks.

Leave it on and it will not blow.

Leave it on and it will not blow.

I have no problem doing that as long as nothing is wrong that could lead to a problem down the road. :thumbsup: Thanks.

Entirely normal. The piston displaces 450cc underneath itself as well as on the top. That's one reason you need a breather tube.

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