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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 11-07-2012, 11:45 AM   #1 (permalink)
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Bonneville SE spark plugs

Can anyone tell me how to remove the plugs from the Bonneville SE and what sort of plug spanner is required?
The riders manual is no help!
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Old 11-07-2012, 11:51 AM   #2 (permalink)
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There's no voodoo involved, but you will need a thin wall socket and popping the tank off helps!

http://www.triumphrat.net/twins-tech...park-plug.html

Last edited by bobbo; 11-07-2012 at 11:54 AM.
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Old 11-07-2012, 01:04 PM   #3 (permalink)
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No need to remove the tank. 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.



On replacement apply a couple of drops of clean engine oil or even better, some anti-seize compound or copper grease to the threads to ease removal next time and prevent seizure.

Halfords do a 20g tube for 3.49: http://www.halfords.com/webapp/wcs/s...egoryId_165705

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).

Last edited by Forchetto; 11-07-2012 at 01:24 PM.
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Old 11-08-2012, 03:46 AM   #4 (permalink)
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True, you don't need to pull the tank, but let's face it, it only takes a couple of minutes and will make the job so much easier.
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Old 11-08-2012, 07:58 AM   #5 (permalink)
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If you remove the tank, you can use a torque wrench... But I can imagine that removing the tank on an EFI bike is a little more involved than for a carbed bike?
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Old 11-08-2012, 11:48 AM   #6 (permalink)
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Actually, after removing my EFI tank a couple of times, I'd say it's just as easy as a carb'd bike - un-clip fuel line (has a quick-connect fitting), pull off vent tube and un-plug fuel pump - easy! There are a couple of threads with pictures in the Sticky section.

And yes, I'd remove the fuel tank too for changing plugs as it's easier to see that the area around the plugs is clean and that nothing drops in.

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Originally Posted by PAAS View Post
If you remove the tank, you can use a torque wrench... But I can imagine that removing the tank on an EFI bike is a little more involved than for a carbed bike?
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