Crank plug cap stuck

Irezumi · Nitrous Nuisance Joined: 07 Dec 2019 Karma :

Attempting to do the valve clearances and trying to remove the cap that would allow me to turn the crank. Its stuck. Allen head (10mm) required tp remove but this is begining to dig in and will round off if I go any further.

Tried penetrating fluid, gave it a whack in to seat it/disrupt thread, tried a quick turn of wratchet, tried increasing leverage, applied a bit of heat. Still stuck.

Next step is cut a slot into it and sacrifice it then get another one if nothing else canbe worked. Any suggestions?

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Put the bike in gear and turn the wheel to turn the crank.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

yen_powell · World Chat Champion Joined: 22 Jun 2008 Karma :

Order a new plug.

Get a hammer and a punch.

Angle the punch and make a groove close to the end of the circular plug.

Now use the punch and a hammer to tap the plug anti-clockwise until you can spin it with your fingers.

Done a lot of these for other people. I try and only use the long arm of an allen key when I do mine up, there's no need to go mad when tightening them.
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Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

Irezumi · Nitrous Nuisance Joined: 07 Dec 2019 Karma :

yen_powell · World Chat Champion Joined: 22 Jun 2008 Karma :

bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

Get a new cover plug, and an aerosol can off "freeze your nuts off" or the spray for freezing water pipes in the plumbing game....

With a warm engine, spray the freezer onto the plug and apply steady torque.

The o ring on the plug tends to have a good hold on these plugs, so steady torque...

If that fails, then think about butchery...

Post a picture of the little blighter and what bike is it, else set engine via rear wheel method...

Enjoy...
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nuts about bikes

to v or not to v · World Chat Champion Joined: 24 Nov 2020 Karma :

have you tried an impact driver?

jeffyjeff · World Chat Champion Joined: 02 May 2020 Karma :

Depending on the bike, that plug could be made of plastic. Confused

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History shows again and again how nature points out the folly of men - BOC

Irezumi · Nitrous Nuisance Joined: 07 Dec 2019 Karma :

Bike is a suzuki sv.

Aluminium cap plug, was very stuck so required cutting a slot then chisel to turn, had tried an impact but this just chewed in as well. Fairly sure the valves have not been checked for a long time. Only 1 just out of spec but most on the edge of being tight so will do all.

Thanks for all the advice though.