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Increasing engine rpm on B&S 420
The Ariens Pro model 926065 with the 420 cc B&S is spec'd by Ariens for 3,600 rpm +/- 100 rpm. Has anyone increased the engine rpm to 3,700 rpm using the governor control? Is it an easy change, and how did you do it?
Thanks for any input.
Thanks for any input.
2015 Ariens Platinum 30 SHO - model 921040
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WHY?????????????? Would you want to do that????
Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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MAHALO!!!!!!!!!
Senior Member
Yeh. Why?
Joe
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That was the first thing that popped in to my head. Why?
Senior Member
Many engines from the factory run slower than their spec'd engine speed. In my experience setting the engine to the top of the spec'd rpm range gives better engine performance and therefore more throughput of snow.
The LCT 414 cc engine in AX form is spec'd for 3,700 rpm but mine was running 3,450 and did not perform as well as I expected/wanted. By changing the governor setting the engine ran at 3,700 rpm and performed very much better. I kept that setting for almost 5 seasons. The LCT/AX engine manufacturer spec'd the 414 cc engine with rpm at 3,900. Near the end of season 5 I upped the governor to 3,925 rpm and it ran better, sounded even better and performed better with snow throughput.
A friend has the B&S 420 cc in an Ariens Pro and has not used it in the winter yet, but has some demanding conditions. The thought is that the engine may be short on rpm and so perform below par. I cannot get access to his engine's governor system since he lives far away. The internet has nothing that I can find so far on the B&S 420 governor system. Now in the fall is a better time to check on stuff, rather than wait until winter snow and cold.
My thought is that some of the experienced people on this forum would know the system and be prepared to share their knowledge.
The LCT 414 cc engine in AX form is spec'd for 3,700 rpm but mine was running 3,450 and did not perform as well as I expected/wanted. By changing the governor setting the engine ran at 3,700 rpm and performed very much better. I kept that setting for almost 5 seasons. The LCT/AX engine manufacturer spec'd the 414 cc engine with rpm at 3,900. Near the end of season 5 I upped the governor to 3,925 rpm and it ran better, sounded even better and performed better with snow throughput.
A friend has the B&S 420 cc in an Ariens Pro and has not used it in the winter yet, but has some demanding conditions. The thought is that the engine may be short on rpm and so perform below par. I cannot get access to his engine's governor system since he lives far away. The internet has nothing that I can find so far on the B&S 420 governor system. Now in the fall is a better time to check on stuff, rather than wait until winter snow and cold.
My thought is that some of the experienced people on this forum would know the system and be prepared to share their knowledge.
2015 Ariens Platinum 30 SHO - model 921040
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Until someone posts and exact answer about the 420cc, Taryl covers it generally in a video only he can do:
2016 Ariens Professional 28
2017 Toro Power Clear 721R
2018 Simplicity Select 1024
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Quote:
Originally Posted by Kielbasa
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That was the first thing that popped in to my head. Why?

2016 Ariens Professional 28
2017 Toro Power Clear 721R
2018 Simplicity Select 1024
Senior Member
Quote:
Originally Posted by Zavie
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Until someone posts and exact answer about the 420cc, Taryl covers it generally in a video only he can do
So the question is whether that B&S engine uses the same spring adjustment process as the Ariens B&S 420 in the Pro.
Thanks for posting.
2015 Ariens Platinum 30 SHO - model 921040
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I'd be very surprised if it didn't have the exact same system.
2016 Ariens Professional 28
2017 Toro Power Clear 721R
2018 Simplicity Select 1024
Quote:
Originally Posted by Zavie
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Until someone posts and exact answer about the 420cc, Taryl covers it generally in a video only he can do:https://www.youtube.com/watch?v=XbFyGRixoGA&t=409s

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