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Old 12-11-2011, 02:03 PM   #26
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Joined: Sep 2009
Location: SE Denver-ish
Oddometer: 7,261
Why engine sounds 'wrong' when rotated backwards a few degrees

mx_rob posted this on TT about the motor sounding 'wrong' when rotated backwards a few degrees to get right on TDC.

"Why you think you are screwed when that happens is the starter sprague clutch (bearing) is engaged as soon as you try to rotate the engine backwards. It takes a bit of effort to roll it backwards since you are having to spin the starter motor through all of the gearing reduction... and since you are turning the crank the reduction is backwards so the starter motor has to spin a lot of turns for a small amount of crank movement."
2004 DR650: 62,605 miles
2013 WR250R

Originally Posted by Threewheelbonnie View Post
"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -

ER70S-2 screwed with this post 03-24-2012 at 08:18 PM
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