whats us with Briggs? speed adjustment?

[edwardh1]

I have a 2 year old 7.25 Briggs walk behind mower. the on line manual has no information about how to adjust the operating speed. they say take it to a dealer ( 1 month wait and $100 probably).
my mower has a handle mounted engine speed control (engine speed , it also has a drive speed )
I took the cover off the mower top and the push wire on the handle that comes down to the mower top is opening the throttle as much as it can (it has slow and fast stops)).
there is a spring attached to it that pulls on the engine inside (I can't see in) when I pull at all with my finger even 1/8 inch on the spring the engine runs great. Where is the adjustment for this spring, there does not seem to be any????????
I looked all over utube but most diy stuff was for mowers that did NOT have a throttle adjustment on the push handle

help

 

[The_Jeff]

If you take the starter rope cover off (easy, 3 bolts) you'll see a "paddle" that gets caught up in the flywheel fan air. This is the main governor, and the handle control just adds a bias to that. But the CPSC won't let the thing run over 3100 RPM so as to keep blade speed within a lame, safe parameter.

I've bent springs to make them go faster but this usually indicts carb problems if it won't run right at governed RPM. Also, bending springs is a black art I have not yet mastered. Do it slightly wrong and you get surging.

 

[old1]

Generally there is no "adjustment" for the rpm, but all you have to do is bend the tab that the spring hooks to on the end that moves with the remote control. Rule of thumb is stretch the spring to make it speed up.

 

[edwardh1]

I l try some carb cleaner first, before messing with the spring.
as I posted pulling on the spring the smallest amount makes it run great. I use pure gas which is readily available in south carolina but I bought it from a neighbor, don't know what he used, maybe a piece of junk loose in the carb.
It just started the lower running speed a week ago

 

[mk378]

This is a governor system like a tractor has. It is not like a car where the driver directly moves the throttle plate with the gas pedal.

The engine speed control lever / cable, if equipped, moves the end of the spring to pull harder on it. If there is no engine speed control lever, the end of the spring is in a fixed position, but you can usually bend something to move it and adjust the speed.

The spring, even in the more slack low speed positions, should move the carburetor throttle plate to wide open with the engine stopped. As the engine rpm increases, the air vane or mechanical governor (inside the crankcase, with a lever on the outside) pulls against the spring and moves the throttle closed. If the engine slows down in tall grass, the force from the air vane lessens and the spring will pull the throttle plate open farther.

Bottom line, the farther out the stationary end of the spring is, applying more initial tension, the faster it will run.

 

[bubbatime]

Originally Posted By: old1
Generally there is no "adjustment" for the rpm, but all you have to do is bend the tab that the spring hooks to on the end that moves with the remote control. Rule of thumb is stretch the spring to make it speed up.


This. There is a spring that goes to a bendable tab. You bend the tab on Briggs engines to increase/decrease RPM.

Here is the procedure for the flathead, but almost all small Briggs engines will be similar.
https://www.youtube.com/watch?v=EVIZtyw3rm4

 

[edwardh1]

wish I could find the exaCT PROCEDURE FOR THE 7.25 190 ENGINE. MY TAB DOES NOT LOOK BENDABLE

 

[old1]

Need a picture

 

[edwardh1]

I will try today

 

[JTK]

The Briggs 190cc "Professional Series" on my ~5yr/old Snapper Commercial 21" mulcher has an actual throttle lever as well, but like yours, it basically just adjusts from high RPM to ludicrous RPM, even though the linkage does seem to stroke a good inch or so. No idle what so ever. Exaggerating a bit on ludicrous speed, but it seems so high on this mower that I don't keep it there often.

 

[edwardh1]

i looked at mine again. the engine is a 7.25 ex
and I have seen the videos on older briggs where you bend the metal tab that the governor spring is hooked onto. the metal tab on mine is not a metal tab and does not look at all bendable.
odd there are no tube videos on thus, maybe it not adjusted much.
my engine had wrong plug in it (!@#$%^) , I will get correct one tomorrow and I opened the gap to 28 , seemed to run smoother

 

[Merkava_4]

I don't need a picture; I got pictures on my hard drive. All I need is the numbers off the engine.