[vhgmcbuddy]

I’ve just removed part of the engine shroud to clear out the squirrels nest in the cooling fins and removed the crankcase breather. When i then turn the engine over by hand there is a lot of crankcase pressure, does this point to a head gasket or valve stem seals letting by? I will remove the head later and see if i can see any signs of letting by. Any idea where i can get a new head gasket from?

[vhgmcbuddy]

ted20, if you send me a pm with your email im sure i have a handbook/workshop manual

[vhgmcbuddy]

I’m a little confused by this MAG carb there are only 2 adjustment screws, one on the air filter side near the choke butterfly that I think is the air mixture adjustment, and the other by the throttle on the engine side that appears to be the throttle stop. If I wind the 1st one all the way in and out it makes no difference to the engine running, even if I remove it completely. The 2nd one just adjusts the tick over, too far one way and it stalls unless you blip the throttle. Any pictures or manuals for this carb would be really useful. I’m starting to think it has to be a carb issue. I’m going to stop by an old agricultural machinery agent John O’Connel I think its called in Codicote this afternoon and see if he has any spare carbs I can swap out to rule this out

[vhgmcbuddy]

If the engine takes a little while to slow down after being revved (and its not just the large / heavy flywheel effect) it points to a lean mixture caused by an air leak.Check cylinder head gasket(s) and carburettor inlet manifold gasket(s).Worth checking valve clearances and ignition timing while you are at it too.
Over fueling (rich mixtures) are evident by black exhaust smoke and sooty / black / fouled spark plugs.

[vhgmcbuddy]

Butterfly’s are all snug no excess ware. i will double check the jets are firmly seated tomorrow it’s getting late to start up with no exhaust. I’m starting to think it’s too much fuel as when i rev the engine it takes a minute or 2 to slow down again pointing to over fueling?

[vhgmcbuddy]

Hi joegrgraham, The place where i got the new clutch shoes gave me a pair of new springs which i have fitted. The only thought i had was are the petrol and deisel engine springs different i.e. does the clutch bit at different rpm? Only a thought.

[vhgmcbuddy]

Hi Stuart it’s a MAG 2055 SLRX 2 cylinder petrol if that helps. I’ve had the carb apart 3 times now removed all the parts and left it sitting in carb cleaner for a while blow an airline through the various jets and holes and used a tiny piece of wire to clean any pin holes out. I’ve never gone down the ultrasonic cleaning route before i’ve never needed to as the above normally does the trick.

[vhgmcbuddy]

Here’s a short vid of the engine adjusted as slow at it will go and slower and it just stall, could it be a fault in the carb over fueling the engine even if the throttle is fully closed?

Attachments:

1. IMG_0668_CLIPCHAMP_240p.mp4

[vhgmcbuddy]

I think you need to clean the carburettor more thoroughly,possibly even get it ultrasonically cleaned.What engine is fitted ??

[vhgmcbuddy]

Hello Charlie. It is definitely a Geest produced by Geest Industries of Spalding. Powered by a Villiers Mark 25 Engine with Albion Gearbox. The photo of the partially restored truck is of my Geest truck before I sold it on.

[vhgmcbuddy]

Hi Charlie,

I think you may have misunderstood what I was trying to explain, so have found another photo from the article and indicated what I believe is the fuel entry point. There is no sign of this on your photo number P1040986 in your first post, so it is probably bunged up with crud.

Sean

Attachments:

1. 

[vhgmcbuddy]

Is the machine the Motor Triple with the centrifugal clutch and expanding / contracting variable speed drive?
Just a couple of thoughts re your overheating but difficult to reconcile with it having worked ok with the previous owner – do you believe what you’ve been told?!
1/ is it possible that the cooling system is air locking?
2/ Is it the correct type thermostat? Some systems use a shielded thermostat that directs the water around the block for a quick warm up but then shuts of the short cut and directs it through the rad once working temp is reached .

[vhgmcbuddy]

Looking at the article you have provided a link to in post #1, in the 14th photo of the sequence it appears to show a small hole in one of the ribs on either side of the centre casting that the main jet is screwed into. My guess is that this hole is drilled into the rib, parallel with the main jet. There is then a cross drilled hole which runs through the rib and into the jet chamber. This cross drilled hole will have a plug in it. As you have the plug removed, see if you can insert a piece of wire and feel for the hole which should join into the cross drilled one behind the plug. I hope this makes sense Charlie. It’s very difficult to explain without being able to point!!

[vhgmcbuddy]

Hi Charlie tried with and without thermostat and new thermostat,previous owner used it as it is with no problems he Also converted it to the mini engine and used it with his job,how can I get info on working machine it is working OK between overheating but not sure what the levers on the left side do

[vhgmcbuddy]

Jan
I have sent you a link by email.
Peter

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