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#1
09-23-2013, 12:03 PM
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BB-36 Crankshaft drive pulley size
Installing a BB36 on an original and need to know the diameter of the crankshaft end drive pulley. Engine is currently equipped with the 3.5" pulley that powers the deck. This is the same dia as the 90 deg gearbox pulley on the thrower.
So, the real question is this: Should the crank pulley be larger or smaller diameter than the gearbox puuley or are they the same? The part #'s are different due to the difference in shaft size. 
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#2
09-27-2013, 09:18 AM
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I must be the only one in the world installing one of these on an original, huh!!
Sokmething is not right as the idler pulley hits the ctank pulley when engaging the belt. The A25 belt in the parts lookup is too short and the next size belt is too long leading me to think the C/S pulley should be smaller. Sure could use some help on this one Guys
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#3
09-27-2013, 11:34 AM
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You will need a smaller pulley.The part # is 475 640 R1
I do not know what size it is though.
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#5
09-27-2013, 12:42 PM
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The smaller one will make it run at the correct speed.
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Up to 533 and counting... I give up updating my profile!
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