Re: HD 25 Carb percolting Home › Forum › Ask A Member › HD 25 Carb percolting › Re: HD 25 Carb percolting stanleyUS Member - 2 YearsReplies: 613Topics: 114 August 30, 2018 at 10:51 pm #82027 No real thought,just reducing variables.If it runs hot in the barrel with no prop,then you know the pump is not sucking air do to excess turbulence or that the pump is inefficient under load.