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500 series won't rev #89750
13/01/18 04:04 PM
13/01/18 04:04 PM
K
kenny_t  Offline OP
Novice
Joined: Dec 2017
Posts: 17
QLD
I recently acquired a 2010 Makita with a B&S 500 Series motor...Machine is in great condition, only problem is that I cannot get it to increase its speed.
The motor has no problems of revving when you manually move the butterfly
I assume that the more tension applied to the governor spring (via the throttle control on the handle) the more the throttle opens...All linkages and cables appear to be doing what they should, but regardless of how much tension I apply to the spring, the throttle only opens about 1/3 way..

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GEDC0945.JPG (44 downloads)

ken edwards
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Re: 500 series won't rev [Re: kenny_t] #89752
13/01/18 04:56 PM
13/01/18 04:56 PM
N
NormK  Offline
SENIOR TECHNICIAN
Joined: Jan 2016
Posts: 2,421
Melbourne
The governor arm should do the rest, the spring is a balancing act to allow the motor to come back to idle but then allow the governor to increase the revs as needed when cutting

Re: 500 series won't rev [Re: kenny_t] #89756
14/01/18 03:07 AM
14/01/18 03:07 AM
AVB  Online Content
SENIOR TECHNICIAN
Joined: Jan 2015
Posts: 595
Tennessee, USA
Kenny what is the model and type numbers? The governor spring looks to be the wrong one but need look the ipl to verify.

Re: 500 series won't rev [Re: kenny_t] #89761
14/01/18 12:05 PM
14/01/18 12:05 PM
K
kenny_t  Offline OP
Novice
Joined: Dec 2017
Posts: 17
QLD
Hi.. numbers are...10T602 0140 B1
Ken


ken edwards
Re: 500 series won't rev [Re: kenny_t] #89765
14/01/18 06:37 PM
14/01/18 06:37 PM
AVB  Online Content
SENIOR TECHNICIAN
Joined: Jan 2015
Posts: 595
Tennessee, USA
Appears that Briggs did use a different than I used to seeing.

Okay the governor spring is PN 698726. If you can make out the color it is painted it should be Pink.
[Linked Image]

The designed top No-load Rpm is 2850 +/- 100 rpm.

To increase the rpm if needed bend the tab toward the throttle linkage while checking the speed with tach.
[Linked Image]


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