Hello Jerry I have a type 4, 2300. and my prior engine, 1910cc. Both engines had trouble running over 3000 RPM. Joe at revmaster told me that a lot of the larger engines have this problem. The solution is to add more fuel. That may mean to add a fuel pump, or increase the mixture, to get it to increase RPM. Now I don't have any problems going up to 2600 RPM. Orma Southfield, MI N110LR celebrating 20 years Flying, flying and more flying http://www.kr-2.aviation-mechanics.com/
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