Mcculloch Hedge trimmer, Virgina MH542P carburettor

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jimbeekeeper

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Mcculloch Hedge trimmer, Virgina MH542P carburettor
« on: August 07, 2011, 18:41 »
Hi

I Have a Mcculloch Hedge trimmer, Virgina MH542P, which I can not loger get to start.

I was using at the weekend to cut my hedge, got one side done, but on turning it off, it will now not start.

I was have a bit of trouble with it before, but  now it is dead.

Been through all the basics, fuel, spark, filter.

I think it might need a new diaphragm, it is not visabley split.

The car just says "ZAMA" on it with a 32, but dont think that is a model type.

Can anyone help?

PS it is a B&Q ex one.

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jimbeekeeper

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #1 on: August 07, 2011, 19:49 »
I have now found on it the following

C1U

There is also a 44 and then 41 on the carb butterfly.

and on the other side, M32B 34A

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jimbeekeeper

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #2 on: August 07, 2011, 20:01 »
Found it now!

http://www.zamacarb.com/pdfs/QuickKit_CR2010.pdf

It lists the kit as either the GND18 for just the diaphragm or the RB28 for full rebuild.


I just need the gaskets and diaphragm for £9 delivered off fleebay.


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arugula

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #3 on: August 07, 2011, 20:08 »
Well done! That's useful to all of us. :)
"They say a snow year's a good year" -- Rutherford.

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jimbeekeeper

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #4 on: August 09, 2011, 19:25 »
Well the carb kit came today, and still it will not fire!

I have changed the fuel, checked the piston rings, still has good compression.

Checked the adjustment screws to std settings.

On taking spark plug out just is very wet with fuel?


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smud6ie

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #5 on: August 09, 2011, 21:20 »
Have you checked the spark under compression,some models of yellow perils had the ignition coil above the blade gearbox and were a real pain .  I tried to attach a file which is very useful technical manual for understandind Zama carbs but too large at 2.5 mb to upload.
Pm your email if you want it sending?
smud6ie

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jimbeekeeper

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #6 on: August 09, 2011, 21:32 »
I have only checked the spark with the plug out and touching the cylinder head...so I guess not under load. How do I do it under load?

Yes the ignition coil is about the gearbox.

PM sent

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smud6ie

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #7 on: August 09, 2011, 21:57 »
I have only checked the spark with the plug out and touching the cylinder head...so I guess not under load. How do I do it under load?

Yes the ignition coil is about the gearbox.

PM sent


See if you can get a timing light like the in in the link,it will test under compresion and shows up a weak system if it does not flash...just connect in series between the plug and plug lead.
smud6ie
http://www.ebay.co.uk/itm/Draper-Neon-Timing-Light-/300586469009?pt=UK_Diagnostic_Tools_Equipment&hash=item45fc598691




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jimbeekeeper

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #8 on: August 09, 2011, 22:09 »
Thanks, and that would indicate..... ignition coil? or plug?

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smud6ie

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Re: Mcculloch Hedge trimmer, Virgina MH542P carburettor
« Reply #9 on: August 10, 2011, 06:03 »
Thanks, and that would indicate..... ignition coil? or plug?
Either,but the plug is easy to eliminate.
There is a little more on the uses of a timing light in an earlier thread,post #8 .I have  in an older one like yours waiting for for repair that will fire up but looses the spark after a few seconds so will most likely need a new coil.

http://chat.allotment-garden.org/index.php?topic=49262.0
smud6ie
« Last Edit: August 10, 2011, 07:09 by smud6ie »



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