Generator motor surging?

Old 01-26-07, 05:00 PM
Thread Starter
Join Date: Jan 2007
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Generator motor surging?

I am trying to help my friend. He has 2 generators both Techmsy motors. 1 8hp and 1 10hp they will both run but surge all the time. I have a good ability working on 2 cycle motors but limited practice on 4 cycle. I think it may have something to do with the governor but I really do not know how they work.

Thanks for taking the time to read this letter.
Old 01-26-07, 08:02 PM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 10,235
Received 65 Likes on 60 Posts
JesseMichigan, Welcome to our forums!

Not a small engine pro but I have a Coleman generator with a 10 hp Tecumseh.
I find that nearly each time I use it I have to fine tune the mixture control on the carb to get it to run smoothly.
Old 01-26-07, 08:20 PM
michaeljp86's Avatar
Join Date: May 2005
Location: USA
Posts: 478
Likes: 0
Received 0 Likes on 0 Posts
Ive heard the same as gregh, I never had one of these engines but I had heard about problem with needing to adjust the carb alot.
Old 01-26-07, 11:47 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 17,996
Received 106 Likes on 96 Posts
I suggest taking the bowl screw off and clean out all 4 holes in it.
Old 01-27-07, 05:47 AM
Join Date: Jan 2007
Location: MA
Posts: 521
Likes: 0
Received 0 Likes on 0 Posts
Surging is usually a sign the engine is starving for gas. Yes, it could be simple adjustments but not likely. Start at the fuel tank and work your way to the carb. Start with fresh gas from the pump, not the gas can. Be sure there is flow from the tank. I would suggest rebuild kits for the carbs but at the least a good cleaning and new inlet needle & seat. Adjust float properly- should be set at 11/64 between float and body when holding carb upside down. To clean properly you need cleaner and compressed air. As Cheese said main jet has very small holes that need to be cleaned well.
Old 01-27-07, 10:31 AM
Visiting Guest
Posts: n/a
Is this "surging" noted while the generator is under load...? (electrical appliance plugged in) Both gens act the same?
Old 02-05-07, 10:17 AM
Thread Starter
Join Date: Jan 2007
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Sorry for the delay
But the motor surges with or with out a load.
I will pull the carb and rebuild it agean using a complete kit.
Thanks for the float setting. 11/64th.

Thanks for all your help.
Old 02-05-07, 10:34 AM
Join Date: Jan 2007
Location: Central Indiana
Posts: 389
Likes: 0
Received 1 Like on 1 Post
(My) Standard procedure on my Tecumseh generator is each time its started and brought up to power & under load to fine-tune the main mixture (needle on bottom of carb bowel) to just towards the rich side to smooth it out.
Old 02-07-07, 06:51 PM
puey61's Avatar
Join Date: Apr 2004
Location: Upstate New York
Posts: 3,234
Likes: 0
Received 2 Likes on 2 Posts
Is each carburetor fixed jetting or adjustable jetting? If you are unsure then post back with each engines' ID numbers. The key in carburetor servicing is to use a quality bath type cleaner to soak the carb in prior to using a spray carb/choke cleaner and then compressed air to blow out all the passageways and then rebuilding with the correct kit. Newer, emission compliant, fixed jet, Tecumseh carburetors are finicky and must be absolutely clean and free of any varnish or other blockage.

Thread Tools
Search this Thread
Ask a Question
Question Title: