Hello All - Newbie question....Can anyone confirm why (1) there are two plus in the swingarm and (2) there are two spark plugs in the engine? 

I am thinking (1) chain lube but I think there might be a nozzle in the bottom missing. Still can’t figure out why there are two plugs. (2) spare plug? 

Best wishes

Moray

The second plug hole is for a decompressor, I'm not sure what the second filler cap in the swing arm is for.

Thank you. Anymore information please? Not sure I understand. I’ve had enduro bikes in the past with decompression levers that lift the exhaust valve. How does the second plug work? 

The decompressor is a valve that that goes in the second plug hole operated by a cable and a small lever on the bars.  They are used to aid starting and and can be used as a brake on slippy descents as tend not to break traction 

You can still get them from twin shock trials shops

HTH

 

 

 

I seem to remember the second "bung" was actually the tap and regulated the flow onto the chain?

On the similar M/X engined montesa we used to start it on the 'spare' plug which was a soft one, warm the engine up before swopping to the centre position and heading out to the track.

Front plug in swinging arm is filler for chain oiler, plug by rear sprocket regulates flow, there is a short metal tube below rear plug with short flexi pipe attached so oil flow is close to chain. thats how it was on the 247 I had many years ago.

 

hi i see you are using the centre plug  for ht lead, is that correct as mine is set up with ht lead on the side plug ?? tia