|Subject:||RE: Overheating||Date:||Fri Oct 23 14:20:36 2020|
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I have a 1928 Deluxe. It has been rebuilt using new Ross
pistons, new valve guides, new valves, a hot rebuilt
Simms mag and a Zenith carb with the new idle mixture
adjuster. The timing is correct,valve adjustments are
right on. Idle mix is set according to Zenith
instructions. I pressure tested each cylinder as I
installed the valve plugs, with no leaks. The bike starts
easily, idles smoothly and runs well going down the road.
My problem is that it runs hot. After a quick 5 mile
ride, the temp measured at the center bolt hole varies
from 360 F to 411 F taken with an infrared thermometer.
I welcome your advice.
For this I have EXTENSIVE experience. I have many 4s and
have ridden 3 times in the motorcycle cannonball on 4s
and worked on several other 4s with this exact problem.
These were ALL recently rebuilt motors from 4 different
builders in both Indians & Hendersons.
The symptoms are:
2 low power
3 very easy starting
4 fire out the pipe and engine "sounds dumb" slow reving
I have found in ALL of these the timing has been retarded
one and even in one case 2 teeth on the mag.
For whatever reason, I recommend what I call "dynamic"
timing. By that I mean ride it,feel it, hear it & smell
it. Don't pay attention to timing marks on the flywheel
except for set up.
Just trust yourself!