Webb AB1474 throttle/governor linkage help
Hi All. Very happy to finally become a member of this fine club. I have been collecting mowers since I was 13 (first was a Ransomes Ajax) and since have acquired a Suffolk Punch Dual drive Mk7, ATCO 12" DeLuxe and finally a Webb AB1474 mower. The final addition is causing me issues which is preventing me from enjoying the mower. I experience a fluctuating throttle response whilst mowing, causing the engine revs to increase and decrease. I have dismantled and cleaned the carburettor and therefore I don't consider this is the issue. As you will be able to tell I do not have experience with the Briggs and Stratton + associated carburettor of the WEBB - my comfort zone is the Suffolk engines and Zenith carbs!!
I am therefore seeking help. I think the governor spring is incorrect (suggestions please on how I can obtain a replacement) but I am also convinced that the set-up is incorrect with where the spring is attached. The final issue is the contact does not engage and stop the engine when pushed forward on the throttle lever - it requires manual intervention by the carburettor!
I would be grateful for advice and perhaps a picture of a correct set-up so I can compare and work to achieving a solution!
Huge thanks in advance - and I would very much like taking the opportunity on showing you all my mowers in due course!
Oh and I couldn't resist showing you my sweet 12" ATCO!
Best Regards
Jonathan
Forums
Thanks Wristpin. I was…
Thanks Wristpin. I was thinking the fluctuation in engine revs might be down to excessive play in the vane by the flywheel affecting the throttle linkage, but I will search up for a replacement spring also. If anyone has a correctly set-up WEBB AB series with this engine and carb please do post a pic, as there are holes in the vane that aren't used also, so I'm worried the spring isn't actually in the correct location!
Thanks again!
Cheers
Jonathan
Unfortunately BS made rather…
Unfortunately BS made rather a lot of variations but these may be of use
Assuming that you’ve done a…
Assuming that you’ve done a good job of cleaning the carburettor and that there are no air leaks around the various gaskets , it looks like the governor spring has seen better days but before you replace it just try richening the mixture a bit by turning the adjusting screw in your image a bit at a time anti clockwise and see if it improves matters. Even putting a bit more tension on the existing spring by gently bending its anchor on the bell crank may help.
To identify a new spring, use the Model, Type and Code numbers to identify the part number- 692205, I think , but check it for yourself. Any decent mower shop will be able to assist you and supply the correct spring but otherwise use an on-line supplier such as Brigsbits