I've recently done exactly the same thing.
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I thought an engine gasket was leaking but it's not,
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it's the sump plug weeping, oil running round onto the engine join/gasket.
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So I'm happy that the engine gasket is fine
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but unhappy that in my hamfisted way I've managed to strip the threads.
![Sad :(](./images/smilies/icon_e_sad.gif)
Anyway I've no specific knowledge or expertise but here goes following advice from a friendly mechanic. These are my thoughts/plan. Helli coil is one way to go but as the sump plugs are in and out fairly regularly I could end up damaging that/stripping it out again etc. There's not a lot of metal around the sump plug. I looked at self tapping oversized sump plugs which seem a simple quick and cheap repair.
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There is also loads of advice on the web/You Tube on how to do it etc.
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But again I was concerned on how long this may last, thin Ali metal etc. Anyway what I am about to try is a piggyback self tapping sump plug. God bless the Americans an answer for everything.
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I couldn't find anyone in the UK who sells them.
![Sad :(](./images/smilies/icon_e_sad.gif)
Basically it is a self tapping oversized sump which you put in the normal way. But in the centre of it there is another threaded drain hole with a smaller screwed plug. My thoughts being I can loctite the main plug in and when I change the oil I can hold that still with a spanner and make sure I just unscrew the centre plug and not disturb the main one.
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So avoiding another stripped thread or wearing out the new threads.
http://www.cgenterprises.com/drain_plug ... repair.htm I have ordered the 1047 currently waiting for it to arrive. I emailed them, a very quick reply to a couple of questions. Posted within 24 hours, currently waiting for the Canadian Postal service to do their stuff. I know this is about cars but I think it principles are the same. Might be of use to you. Best of luck I will let you know when the plug arrives and how things go.
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Best of luck.
Never enough time and so much to see and experience.
Previously a VStrom 650, and a KTM SMR 950, currently XT600E with many mods. And now a F800GS Trophy since the KTM has gone.