[andyfrost]

Wishing you all a healthy & happy Christmas and New Year.

Andy.

[andyfrost]

Jamie , gland seal bush goes in first , followed by the spring washer , then main bearing. I would strongly recommend fitting new gland seal bushes and springs , along with new main bearings if you wish the engine to run and perform well.
Above anything run the machine on a mixture of STRAIGHT 30 grade oil & 16 to 1 ratio.

Andy.

[andyfrost]

John , of the top of my head I can only recall two machines fitted with MK25s , with this type of govenor arrangement , one being your Atco mower , and the other a Wrigley (or Bonser ??) motor truck , hence why technical info is thin on the ground.
It seems an odd sort of system , but trust me once set correctly works very well indeed.

Andy.

[andyfrost]

John , externally it looks as it should , when not running the butterfly should be in the wide open position , when engine starts , it should then govern down. When you have it running , can you feel any manual resistance on the govenor rod , in other words feel it trying to shut down , if you can’t , it could be an internal problem with the govenor weights.
One other point , have you removed the linkage from the govenor shaft , and not refitted in the same position.

Andy.

[andyfrost]

Then all seems in order John , the cable merely operates on the carb slide , there is no cable for the govenor linkage. The MK15 engine on the Howard Bantams works on exactly the same principle , amongst a few others.

Andy.

[andyfrost]

John , it’s a slide type carb , and would certainly have had a throttle cable.

Andy.

[andyfrost]

Darren , they are still available on that well known auction site , by the way your parts went in yesterdays post.

Andy.

[andyfrost]

Darren , obviously the Carb and magneto parts are Villiers , as this engine is unique to Atco , I suspect that they had this produced by Villiers at their design/request.
I’m almost certain I have one of those floats , and more than likely a good bowl , that you are most welcome to FOC. I’ll have a gander in the morning.

Andy.

[andyfrost]

Darren , it’s an Atco/Villiers , only ever used on Atco products.

Andy.

[andyfrost]

John , the needle and seat assembly is common to all those variations of Villiers carbs.

Andy.

[andyfrost]

Angus , very well put , it’s amazing the ammount of “perfect paint jobs” you see around being spoilt by oil leaks , often caused by not enough attention to relatively minor points like a correctly working breather.

Andy.

[andyfrost]

Regarding the oil leak , check and thoroughly clean the breather , I would suspect from your description of the engine internals that it’s not working.

Andy.

[andyfrost]

Didn’t Mechanised Gardening take over Geo Monroe ?? , I seem to recall their last location as Great Gransden in Bedfordshire.

Andy.

[andyfrost]

Well done John , that is in remarkable condition , I was the other mug bidding for it……should have gone a tad more. The seller seems a really nice chap , I had a conversation with him on the phone during the week.

Best Andy.

[andyfrost]

John , are you sure it’s a MK40 , these usually had MK20 or MK25 fitted.

Andy.

[Author]

Posts