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Guru porting oppinions (pics)

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I purchased a 2010 250r full mod. I was doing a rebuild on the head, and noticed the porting around ihtake valves was grinded to a straight flow to valve dish. I know on previous year crf's have quite a bit of material around guide (not sure about 2010). To me quite a bit of metal and guide were removed. Is this something I should be concerned about. It was a full mod Loretta Lynns bike that placed in top 25. It rips for sure.

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i prefer to keep as much guide as i can theres no flow gain to speak of in grinding it away but i have seen a lot of heads done that way .

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i prefer to keep as much guide as i can theres no flow gain to speak of in grinding it away but i have seen a lot of heads done that way .

Thanks for your reply. When I replace the guides should I grind them flush again or would it be safe to leave them without the cylinder area support not being there?

Edited by iMOTO189

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Thanks for your reply. When I replace the guides should I grind them flush again or would it be safe to leave them without the cylinder area support not being there?

Don't grind flush it's a waste of effort.

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