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HelicopterThunder TigerOther › Stock Pinion Size? R90
10-08-2005 06:52 PM  12 years agoPost 1
loewermx

rrVeteran

Alexandria, La

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What size is the stock pinion on a R90 STD? I am trying to get to a 8.45 gear ratio for a YS91. Also, what is the best pipe to use with that ratio and motor?

Scott

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10-08-2005 07:40 PM  12 years agoPost 2
hepsibar

rrApprentice

Perth WA

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You require the 11 tooth pinion and 93 tooth main gear.

93/11 =8.45

Just count the teeth of the pinion you have. It will probably be the 11 toothe one.

Empty Coffee Cup

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