Re: starts breaking up at 4500 rpm.
You might try putting some foam in the cell... I don't have a lot of experience with injection, but sure sounds like it is running out of fuel or getting air in it.
With higher pressure of injection and a lot of return at high pressure, if it is putting air in the cell, getting air in the line, it will cause headaches...
Keep working on it, you will find it.
Ken
Stock 412
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