Stale fuel can definitely cause issues like this, especially if it's been sitting in the can since last season. Always good to start with fresh fuel. 

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The carb Id, you could perhaps attach a photo or two of the offending item.    If you manually apply a bit of choke while it's running does the surging even out?

Quote from: Mick on May 02, 2026, 06:40:52 PMThat's definitely a carb / fuel issue, unless it has an air leak. 

What carb is on that machine?

Thanks for the response.
I didn't get a notification of your response.
Not sure why.
Anyway. No air leaks. Checked the vacuum pipe and added jubilee clip to the carb connection just in case.
I was thinking last night about stale fuel.
I have no idea how old it is.
Do you think that might cause the hunting?
I have no idea what the carb is.
My guess id original equipment.

That's definitely a carb / fuel issue, unless it has an air leak. 

What carb is on that machine?

Hello forum.

Back again.

I'm trying to get this machine up and running for an elderly neighbour who is currently pushing a lawn mower around his large gardens.

He had this machine given to him for nothing.

It has been standing idle outside under a tarp for decades.

Story so far.

This machine was dead. No crank.

New starter solenoid (old one cracked at the battery terminal).
New starter fuse holder and 15A fuse. (old one had a broken terminal connector)
New seat switch. (old one had broken spring)
New bin switch. (might as well)
New ignition switch. (no continuity through old one)

Engine would now crank but no start.

Checked for spark. No spark.

Replaced plug. No spark.

Checked ignition coil resistance. Should be 2.5 to 5 kOhms

Reads 43 kOhms. Knackered

New ignition coil.

At this point engine now starts and runs but rough.

New air filter and fuel filter.

And here's what it sounds like today. (See link below)

I don't think it's a carb issue.

Maybe timing?

All and any thoughts would be appreciated.

Thanks in advance.

http://86.153.209.5:163/HuntingMower2.mp4

The answer is yes, you can buy them and they are about 8 euros (Portugese Honda site) via https://honda.gardening-parts.com/honda-gardening/assignment_spare_parts/21289V18640

Part number is obviously 21289V18640

Hi, and welcome to TGMForum.

The control cable would normally go in the small hole next to the one it's in now. 

The governor spring is fitted in the right place but isn't the right spring. it should have a loop on one end where it goes on the control, and a hook on the other end going onto the carb.

Also looks like Amazon or similar after market carb. I would check that the throttle rod isn't too tight a fit in the throttle shaft, it looks pretty snug to me.

Hello. First time here and bringing problems not solutions...Above would not run and diagnosed carb issue and replaced Unfortunately I suspect I didn't put linkagea back together again properly. Can any adult here please confirm/deny my suspicion? Regards etc

I opened the control box again, and I removed both switches. I then operated the switches manually and the mower worked normally.

I have included photos of the open control box and the trigger switches. I hope it may help someone else should they come across the same problem.

The larger switch in the foreground controls the drive and sits diagonally. The smaller switch turns the blade motor on and off. The trigger units sit on the springs and then you have to sandwich them in when closing the lid. It truly is a cheap and nasty design.

I had to bend out the metal lever on the small switch to ensure a firm closure. The mower is working well, but I hope I don't see another one!

Hi, hope all is well with you. Does anyone have a gear case gasket or know where to buy them. I have tried all the normal suppliers.

Thanks

Quote from: Mick on April 08, 2026, 04:33:24 PM

Quote from: Brido on April 08, 2026, 04:06:28 PMIt looks to be the actual axle itself mate

You mean one side isn't turning? From what I can see it's a one piece shaft that runs through the gearbox, and on each end is a pinion with one way ratchet or clutch.  Do you by chance have a link to a parts list for this machine?
 

Getting back to this thing mate I am completely stumped, 2 separate shafts, large metalic disc with holes for the parking brake. There is nothing physically  able to engage or join the 2 shafts together, 1 side is just bare shaft other side like a micromech type with cogs? Completely stumped lol