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Old 02-29-2016, 08:20 PM
kristo.thaler@gmail.com kristo.thaler@gmail.com is offline
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XJ11 Spark plug thread repair

Hey everyone,
I got my bike last october and she died on me at work in early november. I replaced the spark plugs one night in an attempt to get her to start. Anyways, it was cold and dark and I crossed 2 of the threads. Didnt look too bad, vacuumed out the shavings and put them back in, but when I finally got her started again (wasn't the spark plugs) they werent holding pressure. It definitely showed in her performance as well.

The question is: What are my options?
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Old 02-29-2016, 09:02 PM
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bikerphil bikerphil is offline
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You should be able to use a 14MM spark plug Helicoil, available at auto parts stores.
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79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, 14MM M/C (158K miles)
79SF - every day rider, solo seat mod, Brembo 16MM M/C, Accel 3Ω's, Supertrapp (115K miles)

"If it ain't broke, modify it"

25+ year XS11 owner

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  #3  
Old 02-29-2016, 09:40 PM
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IanDMacDonald IanDMacDonald is offline
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+1 But, are you sure the spark plugs were threaded properly? This very thing happened to me. I heavily greased the threads, and used a chaser.
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1979 XS1100F
2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
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Old 03-01-2016, 08:14 AM
kristo.thaler@gmail.com kristo.thaler@gmail.com is offline
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Yes, I believe they were threaded properly. I also greased them and it still didn't hold pressure. If I am to use a Helicoil, which 14mm should I use? There seem to be several different types.
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Last edited by kristo.thaler@gmail.com; 03-01-2016 at 08:15 AM. Reason: Added Helicoil question
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  #5  
Old 03-01-2016, 02:05 PM
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bikerphil bikerphil is offline
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The HeliCoil kit that will work on our bikes is part # 5334-14.
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79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, 14MM M/C (158K miles)
79SF - every day rider, solo seat mod, Brembo 16MM M/C, Accel 3Ω's, Supertrapp (115K miles)

"If it ain't broke, modify it"

25+ year XS11 owner

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  #6  
Old 03-01-2016, 04:33 PM
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jetmechmarty jetmechmarty is offline
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Here is an alternative repair.

http://www.timesert.com/
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  #7  
Old 03-02-2016, 12:32 AM
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TomB TomB is offline
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I've used both Helicoil and Timesert, both good kits, but the Timesert is much better as there is no risk of the insert screwing its way into the cylinder when screwing in a spark plug.
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1982 5K7 Sport, restored to original from a wreck
1978 2H9 (E), my original XS11, mostly original
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Old 03-02-2016, 07:06 AM
kristo.thaler@gmail.com kristo.thaler@gmail.com is offline
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Thanks for the help guys! Bought Helicoils and thread lock to keep them from losing their place.
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