Subject:RE: RE: Overheating Date:Fri Oct 23 16:32:21 2020
Response to:7406

Thanks for your reply. I checked the flywheel timing marks before assembly. They're right on. I also pressure tested the intake manifold, AOK. This bike has Ricardo heads if that makes a differencs. I checked the timing with a strob. Fires at 15 BTDC retarded to 40 BTDC advanced.

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:
1 Overheating
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!

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