New-to-me Wd45 low rpm

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   Good morning gentlemen. 

I’ve had a friends WD45 sitting about the farm for a bit. I’d like to put it to work. Starts generally well. New carb, supposedly rebuilt engine. 

It fails to maintain rpm while running. Bogs under load from 4’ brush hog in medium grass.

I adjusted the carb/governor arm linkage by bending. It was 3/16” off. While tractor is off, linkage sits just into the gov arm hole with carb at max input. Gov arm on hand throttle/gov body side sits fully engaged at max rpm. After starting, gov arm reduces rpm at carb, hand throttle does not increase rpm. 

Can someone post pictures of the throttle side spring linkage, and the carb-side spring linkage? I believe they’re incorrectly installed. 

Hand throttle is fully engaged about 3/4 of the way down, but gov arm on gov side is fully engaged for max throttle. 

Do you gentleman know what may be the culprit here? Thank you 

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OldManLarry Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 04 Sep 2025 Location: Nebraska Points: 6	Post Options Post Reply Quote OldManLarry Report Post Thanks(0) Quote Reply Topic: New-to-me Wd45 low rpm Posted: 7 hours 18 minutes ago at 11:11am
	Good morning gentlemen. I’ve had a friends WD45 sitting about the farm for a bit. I’d like to put it to work. Starts generally well. New carb, supposedly rebuilt engine. It fails to maintain rpm while running. Bogs under load from 4’ brush hog in medium grass. I adjusted the carb/governor arm linkage by bending. It was 3/16” off. While tractor is off, linkage sits just into the gov arm hole with carb at max input. Gov arm on hand throttle/gov body side sits fully engaged at max rpm. After starting, gov arm reduces rpm at carb, hand throttle does not increase rpm. Can someone post pictures of the throttle side spring linkage, and the carb-side spring linkage? I believe they’re incorrectly installed. Hand throttle is fully engaged about 3/4 of the way down, but gov arm on gov side is fully engaged for max throttle. Do you gentleman know what may be the culprit here? Thank you

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OldManLarry Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 04 Sep 2025 Location: Nebraska Points: 6	Post Options Post Reply Quote OldManLarry Report Post Thanks(0) Quote Reply Posted: 7 hours 16 minutes ago at 11:13am
	After shutting down tractor, carb and gov arm return to max throttle position. There’s a large dent, watermelon could sit down in it, in the underside of the oil pan. I see oil lines running to the governor. Maybe there’s a correlation there? Thank you sirs, I really appreciate your time and knowledge Edited by OldManLarry - 6 hours 44 minutes ago at 11:45am

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 22004	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 2 hours 30 minutes ago at 3:59pm
	Start with this: There CANNOT be ANY SPRING (on the carb side) connected to the governor arm, governor link rod or the carburetors throttle shaft. There SHOULD BE a spring connected to the CHOKE lever that goes to the engine's block drain cock. That is correct. Any spring connected to the governor/carb control on a WD-45 is WRONG. Until this is verified and/or corrected, everything else you do won't be right.

OldManLarry Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 04 Sep 2025 Location: Nebraska Points: 6	Post Options Post Reply Quote OldManLarry Report Post Thanks(0) Quote Reply Posted: 2 hours 24 minutes ago at 4:05pm
	DrAllis, thank you. I’ll get that spring in the correct spot. It’s currently just dangling from the gov-carb linkage arm. I’ll check back in after

OldManLarry Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 04 Sep 2025 Location: Nebraska Points: 6	Post Options Post Reply Quote OldManLarry Report Post Thanks(0) Quote Reply Posted: 1 hour 60 minutes ago at 4:29pm
	Choke plate spring is now connected, holding the choke closed except when choke is pulled. Thank you DrAllis. The gov. Arm on the carb side still seems to me like it is restricting the rpm’s. Any other ideas? Thank you

OldManLarry Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 04 Sep 2025 Location: Nebraska Points: 6	Post Options Post Reply Quote OldManLarry Report Post Thanks(0) Quote Reply Posted: 1 hour 53 minutes ago at 4:36pm
	With the hand throttle at the highest rpm setting, should the govenor arm/linkage at the carb be fully engaged against the carb pin?