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Hayter Harrier 56 BBC governor springs on carb linkage

Started by Renardiere, February 22, 2021, 02:31:49 PM

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Renardiere

Hi all,

 Have a Hayter Harrier 56 BBC in at the moment. I don't normally deal with mowers so this is a bit new for me. With the engine running the governor linkage is constantly pulsing. It's clear that the springs that act on this linkage have been messed with however I can't figure out what the arrangement should be and I can't find any illustrations on line anywhere. The parts diagrams are only in exploded form and don't show a complete assembly.
 Can anyone give me a clue please or ideally a picture of what the arrangement should be. Would be very grateful. Thanks. Alan

Mick

Hi Renardiere.

The pulsing I assume is what we call hunting where the engine rpm constantly surges up and down.  This is a common issue especially noticeable on machines fitted with BBC fitted as blade isn't acting as a flywheel.

The hunting is normally cause by fuel issues, either bad fuel (old not fresh fuel), or a slight blockage in the carburettor.  I'm betting it would be more likely the carb needs cleaning to resolve this one.  Depending on what carb you have it coulld also be related to float level, take a look here for that info, Check Your Float Level

Renardiere

OK,  I wondered about the lack of flywheel effect initially until I saw how much the governor linkage was moving and the fact that one of the two springs does not seem to be connected at both ends.
 The big problem is I can't engage the blades as the machine is in to have the lever that activates the blades replaced as the original is broken.
 I think I might just sit on it until I resolve that issue and see how we go from there. Thanks for the advice.
 Should also add that if I manually restrain the governor linkage the engine will run smoothly.

Mick

The flywheel effect from the blade helps to disguise the problem is what I was getting at.  ;)  The engine shouldn't hunt if fuel system is set up working properly, regardless of the blade engaged or not. 

Maybe a couple of photos of carb and throttle linkage would help to determine exactly what series engine we're talking about. 

Renardiere

OK Problem sorted now thanks. Gave the carb a good clean, not particularly dirty but there were globules of water in the fuel bowl. Also having the carburettor in bits made it easier to figure out what the springs should be doing and where they attach to. All running well now.

Many thanks.

Mick

The water droplets issue is very common nowadays with ethanol in the fuel it grabs moisture out of the air and it ends up in the bowl.

Glad you got it sorted.  :tup: