Montesa Cota 247 plug confusion

[Moray Kidd]

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

[barnesy]

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

[Moray Kidd]

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? 

[barnesy]

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

 

 

 

[bultobill]

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

[teamferret]

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.

[dave_t]

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.

 

[baphomet]

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