[andyfrost]

Grahame , there is no throttle linkage , the SA engine is ungoverned , just has a simple and reliable slide type carb.

Andy.

[andyfrost]

David , have tou tried Neil Jarret , if it’s the same float as in an MG2 , he may have one.Also looking again at your pics , I’m not overly convinced that it’s the correct needle

Andy.

• This reply was modified 9 months ago by andyfrost.

[andyfrost]

David…….Knights , that’s a blast from the past , they used to do some of our boring work , but we mainly used Plumsteads , who really were a class act. “Sniffly” Plumstead had absolutely draw fulls od mixed rings , all labelled in inch increments , even he didn’t know what they fitted , wish I had them now!!

[andyfrost]

Grahame , interesting post , out of all the countless engines that have been built over the years , rings from some engines will fit others , it would be interesting to pool all our knowleddge onto a permanent topic on this site , one example that I stumbled across a few years back , Anzani Super Single outboard are the same as Shay120cc. Another from years back , Hillman Imp big end Shells will fit the single Cylinder Scammell fire pump engines. I suspect we would all be very surprised what crossing of rings could be achieved if only we knew , obviously with pistons , it’s far more limited.

Andy.

[andyfrost]

Ransomes used Sturmey engines quite alot , the MG2 crawlers for example.Piston material…..well I think you’re trying to get too technical , remember many engines we play about with originally had cast iron pistons , but replacements such as hepolite etc. etc. went over to alloy , with no modification to any components. Just one of many examples is the Villiers 25C , originally cast iron , but replacements available in alloy with none of the issues you mention.

Andy.

[andyfrost]

Dents in your float will make significant issues on running , engine appears to be Sturmey Archer.

Andy.

[andyfrost]

Sorry David I can’t make alot of sense with that , there’s no way a 2A would rev to 4000 , it would simply blow up after VERY short time.Assuming you had both engines stripped out , did the ungoverned one have any sign of the internal govenor components.When correct they are one of the easiest starting engines , I’ve just finished one on a Howard Bulldog for a friend , starts first pull and runs like a clock.

Andy.

[andyfrost]

I’ve worked on quite a number of 2As , and have seen both types of camshaft , but have NEVER seen one without govenors , out of interest is the block machined to take the govenor shaft. I can’t envisage a 2A lasting very long at 4000RPM…… something doesn’t seem to add up here.

Andy.

[andyfrost]

Grahame , Cox and Turner should be able to help you with SV54 rings.

Andy.

[andyfrost]

It’s quite a common problem with the 21/Osprey models , having the Duralinium disc , they tended to “bend a small set” where the blades bolt on (see pic 2) , take the carrier off and simply hammer back into shape using a suitable anvil/block, in other words until perfectly flat , the blades should rotate freely through 369 degrees.When these blades were used on the smaller Hayterettes , it was not so much a problem as they used steel discs.

Andy.

[andyfrost]

Well done again Robert.

Andy.

[andyfrost]

That’s a good start , next thing is remove flywheel , THOROUGHLY clean and reset points , and you should have a spark.Clean out Carb and tank , and most importantly fit new diaphragm.

Andy.

[andyfrost]

Valves usually stick “open” , check again , as you say it appears to turn over OK , in which case the valve should at least be seen moving.

Andy.

[andyfrost]

George at villiersparts has a reasonable stock of Allen Scythe parts , he’s well worth a try.

Andy.

[andyfrost]

Dave , personally I would give it one more go at removing the boss give it as much heat as you reasonably can , and immediately pour cold water over it , if it doesn’t “sizzle” then apply more heat and repeat , then try your puller , tighten it up , and give the puller a brisk tap with your hammer.
There’s nothing to say your existing coil/condenser have gone , could still be OK, just remove them out of the way before applying the heat.

Andy.

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