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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › What do I need to do too put the crank sensor on my YS 91SR 3DS?
06-08-2012 06:11 AM  9 years ago
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BladeStrikes

rrElite Veteran

Shelby TWP,Mi

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What do I need to do too put the crank sensor on my YS 91SR 3DS?
I just got a brand new Spectrum AR7100R so I can run a stright 6.6V LiFe pack and use the back plate sensor,kinda clean the wiring up also.I can't remember but I think someone said they changed the back plate to the standard YS 91SR back plate,is that correct?
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06-08-2012 04:39 PM  9 years ago
ahensley323

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Savannah, GA

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You are correct, replace the backplate:

IMPORTANT
The new YS91SR-3DS has a steel lining on the back plate to minimize drag to increase performance and horsepower. Back plate mounting RPM sensors will not work, because the steel lining will block the pick-up. A magnet mounted on the clutch bell or fan unit is recommended. Another option is to replace the steel lined back plate with an all aluminum back plate (YS5865, same as YS91SR), if you choose to use your back plate mounted RPM sensor.
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