" Joe,
I once had a 1955 Ev
" Joe,
I once had a 1955 Evinrude 15hp with which I learned that there needed to be synchronization between a mark on the timing plate meeting the roller connected to carburetor linkage just as the carburetor began to open. My understanding was that this insures the proper amount of spark advance for the amount of opening of the butterfly.
In an attempt to achieve this I found that there seemed to be very little, if any, adjustment at the timing plate. There may have been a 1/6?Š1/8?at the most at the extreme end of that plate, which probably offered an adjustment that would be measured in the 1/1000??at the mark where it meets that roller. I had to actually bend the carburetor linkage in order to achieve this timing between the spark advance and the butterfly beginning to open. Doing so did seem to improve not only my idle but also performance all the way through the range of acceleration to WOT.
I am currently working on an RD18, 1956 30hp, and am finding the same thing. Am I correct in believing that this mark needs to meet the roller just as the carburetor begins to open?
If so, in the absence of any part being sufficiently adjustable, I am wondering if there is supposed to be a spacer between the carburetor and the intake that would set the carburetor just a little further from the intake? How thick should that spacer be if there is supposed to be one? And, finally, if there should be no spacer, and I am not operating on misinformation, is there something other than bending the carburetor linkage that I should do to synchronize the timing with the carburetor?
It just seems odd to me that an adjustment this important can only be achieved by bending something. "
I once had a 1955 Ev
" Joe,
I once had a 1955 Evinrude 15hp with which I learned that there needed to be synchronization between a mark on the timing plate meeting the roller connected to carburetor linkage just as the carburetor began to open. My understanding was that this insures the proper amount of spark advance for the amount of opening of the butterfly.
In an attempt to achieve this I found that there seemed to be very little, if any, adjustment at the timing plate. There may have been a 1/6?Š1/8?at the most at the extreme end of that plate, which probably offered an adjustment that would be measured in the 1/1000??at the mark where it meets that roller. I had to actually bend the carburetor linkage in order to achieve this timing between the spark advance and the butterfly beginning to open. Doing so did seem to improve not only my idle but also performance all the way through the range of acceleration to WOT.
I am currently working on an RD18, 1956 30hp, and am finding the same thing. Am I correct in believing that this mark needs to meet the roller just as the carburetor begins to open?
If so, in the absence of any part being sufficiently adjustable, I am wondering if there is supposed to be a spacer between the carburetor and the intake that would set the carburetor just a little further from the intake? How thick should that spacer be if there is supposed to be one? And, finally, if there should be no spacer, and I am not operating on misinformation, is there something other than bending the carburetor linkage that I should do to synchronize the timing with the carburetor?
It just seems odd to me that an adjustment this important can only be achieved by bending something. "
