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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 10-25-2013, 05:37 PM   #1 (permalink)
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T100 Spark plug removal and reinstall

I'm a novice with maintenance and about to put my 2012 Bonneville T100 in storage for about 4 months or so. The owner's manual says to remove the spark plugs and pour some oil into the cylinders, but it doesn't tell you how to remove them or how to reinstall them. I'll be honest - I'm not even sure I've located the spark plug location correctly. So, if anyone out there could give me some guidance on this process, it'd be much appreciated. Thanks!
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Old 10-25-2013, 05:50 PM   #2 (permalink)
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Originally Posted by df1524 View Post
I'm a novice with maintenance and about to put my 2012 Bonneville T100 in storage for about 4 months or so. The owner's manual says to remove the spark plugs and pour some oil into the cylinders, but it doesn't tell you how to remove them or how to reinstall them. I'll be honest - I'm not even sure I've located the spark plug location correctly. So, if anyone out there could give me some guidance on this process, it'd be much appreciated. Thanks!
If your really want to do it, the plugs are behind the SAI pipes.....you need a thin socket or you have to lift the tank.
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Old 10-25-2013, 07:11 PM   #3 (permalink)
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Since your AI is still intact, might be easier to remove the tank. Craftsmen sells a thin walled 18mm deep socket.

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Old 10-26-2013, 01:05 AM   #4 (permalink)
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Tank removal on EFI models like yours is rather more involed that on carbed ones. This link takes you to a post with details, including a video:

http://www.triumphrat.net/twins-tech...ml#post2579926

Easier to remove the plugs, Clean out the space around the plug as dirt tends to collect in there and could fall inside the cylinder. Compressed air is best, but a paint brush and small vacuum cleaner nozzle helps.

Obtain an 18 mm thin wall (very important) tube or box wrench. This will seem too long but there's room under the tank just above the plugs to insert the wrench upwards and then lower it above the plug.

Use a bar or screwdriver as a tommy bar to undo plug.

To replace, although the plug manufacturer (NGK) gives a torque setting they realise that in a lot of vehicles you can't get a torque wrench in there.

They advise that in the case of our 12mm-thread plugs, that you bottom them by hand and then turn the wrench a further 1/12th of a turn (about 30 degrees of rotation).

That's in the case of used plugs. For new ones with uncrushed sealing washer they advise rotation by 1/2 turn (180 degrees).

Obtain a suitable wrench like this:



Or this:


Last edited by Forchetto; 10-26-2013 at 01:08 AM.
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Old 10-26-2013, 09:21 AM   #5 (permalink)
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If you're only going to store it for four months, oil in the cylinders is overkill. I would do it if I was going to store it for a year, though.
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Old 10-26-2013, 09:35 AM   #6 (permalink)
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If you appreciate a high quality tool (and who doesn't ) then the Motion Pro plug wrench for the Honda XR400 works very well with Hinckley twins. Here is one source: http://www.ebay.com/itm/Motion-Pro-1...-/270922210736
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Old 10-26-2013, 10:38 AM   #7 (permalink)
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I wouldn't bother doing it for just the winter, especially if the AI is in the way.

A Craftsman 18mm spark plug socket will fit.
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Old 10-27-2013, 05:51 PM   #8 (permalink)
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Great! Thanks so much, everyone.
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