[charlie]

Inspection of the piston revealed one piston ring was rotating in groove due to broken lock pin. This will need repairing before reassembly. Luckily piston ring had not suffered serious damage. The engine is a two stroke and ring could have caught in one of the ports. There was excessive movement of piston on connecting rod, so gudgeon pin was removed, this showed wear in pin and bush; this will need attention before reassembly.

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[charlie]

The engine has an aluminium cylinder head and the previous owner had told me when he had previously removed cylinder he did not risk removing head due to head bolts corroded into cylinder head. I followed the same course of action and removed barrel and head together to reveal piston etc.

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[charlie]

The major issue with this machine is an unknown engine problem that caused it to stop/seize up, the previous owner suspected a bearing in the engine.
So I set about stripping the engine.
First task was to remove cowling, exhaust and inlet etc.

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[charlie]

Castrol XL is still available details here Other simialr oils are also available eg Morris Oils An SAE50 oil would be thicker than SAE30.

[charlie]

A quick google search for Zeus tables reveals that an app is now available for mobile phones.

[charlie]

I have found if a magneto is suspect it is far easier to change coil, condenser and points all at the same time. A more expensive way to solve problem but it does mean everything is new and should give years of trouble free running. Also only requires setting timing once.

[charlie]

Benjamin the links I gave include other threads if you go to the home page. As others have said Zeus tables are a must have along with thread gauges. I have a book which details many other threads including German and Swiss variants of metric, it can be a minefield.

[charlie]

It could be one of several possibilities, see following links for details.
BSF
BA
BSC
Is the replacement UNF?

[charlie]

Try contacting Museum of English Rural Life (MERL) at Redaing, they hold the factory records for Allen Scythes along with the engineering drawings.

[charlie]

wristpin topic closed and edited.

[charlie]

Alternatively the throttle cable needs adjusting at top of carb, if too long it allows slide to drop to far and engine will stop. Adjusting length has same effect as opening throttle with lever ie it lifts the slide and needle.

[charlie]

Throttle stop not set correctly allowing revs to drop to far?

[charlie]

mayfield, if you are having problems renewing your membership follow the help link ‘Problems? see the help page here’ on the homepage this will give guidance and alternative links.
Charlie

[charlie]

Dave renewal received on 15th Dec and card posted within a few days of receipt. All renewals received so far have been processed and posted.

[charlie]

Jim, thanks for the kind words, glad you like the souvenir.

[Author]

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