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Old 05-29-2013, 06:33 AM   #12661
tslaw
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Quote:
Originally Posted by babarnette View Post
Plug had been in for one year. I change it every Summer, it probably had 5,000 or 6,000 miles on that plug with most of those being in Alaska.


Bike has 12,000 total miles on it.
May have had a problem with your torque wrench on the last spark plug change, or the antiseize reduced the friction so that you overtightened at the correct torque, or carbon build-up fuzed the end of the plug to the threads. I don't have a clue.

Hope whatever created this mess doesn't happen again. Glad you got it fixed. Good job, Switch team.
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Old 05-29-2013, 06:56 AM   #12662
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I wouldn't think it would be elevation that caused it. Bikes actually run richer from less oxygen at altitude.
They are lean from the factory, then the manifold issue can play havoc on one.
Was the plug hole so far gone that it wouldn't take a thread repair insert? That repair has a lot less money involved than a head swap, and can successfully be done without pulling the head back off. Win-win.

Just curious to what brand plug that was in your bike.
When switch posted this: "umm.. normally that much sticks through to the inside of the cylinder, i would bet you will have to pull the head to fix that,, but you might get lucky", I was thinking he had a lapse or something. With the proper reach plug installed, virtually no threads are exposed to combustion.
This was fused to the head from extreme heat. FWIW, if the plug isn't torqued properly, more heat builds up in the tip from less heat transfer into the head.

switch, I remember all the mess on the Ford engines with plugs breaking off in the heads. Can't buy decent parts any more
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Old 05-29-2013, 07:50 AM   #12663
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MSR, it was an NGK plug, replaced it with an Autolite. About 25% of the threads closest to the combustion chamber are just gone like someone took a large drill bit and just wallowed them out. I think the head would have to be pulled again to attempt any repair of those threads. The new spark plug sticks out the same amount as the old one but now about 25% of its threads are exposed. It would make me feel better just to replace the head when I have the chance. Plus, if I sell it, I don't want to sell something that has had issues with the motor.

Edit: On a side note it's time for a new rear tire and I'm tired of changing it every 2,000 miles. Anyone have any suggestions for a good high mileage tire? I was thinking about a TKC 80 because Thunderhart has had good luck with his.

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Old 05-29-2013, 08:08 AM   #12664
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Hey Barbarnette, As for tires, I run the Shinko 705 on my Big Mexican Woman and have had great life out of them. I got 12,000 miles out of the last set. Now I dont know if those will fit your bike or not, but doesn't hurt to look.

Stephen
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Old 05-29-2013, 08:11 AM   #12665
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Hey Knightwork, I would love to come out and meet you guys next Saturday. I am just wondering what PBTB is? I am thinking it has something to do with Pelahatchie Bay something or other. Let me know and I will be there my man.
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Old 05-29-2013, 08:20 AM   #12666
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Hey Knightwork, I would love to come out and meet you guys next Saturday. I am just wondering what PBTB is? I am thinking it has something to do with Pelahatchie Bay something or other. Let me know and I will be there my man.
Pelahatchie Bay Trading Post
2363 Mississippi 471
Brandon, MS 39047

Quote:
Originally Posted by optikalilluzion4 View Post
Hey Barbarnette, As for tires, I run the Shinko 705 on my Big Mexican Woman and have had great life out of them. I got 12,000 miles out of the last set. Now I dont know if those will fit your bike or not, but doesn't hurt to look.

Stephen
Well the price is certainly right. I don't know if they'll fit though, I run a 4.60-18 on it now. 120/90-18 would work but all they have is 120/80-18.
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Old 05-29-2013, 08:36 AM   #12667
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Hey Knightwork, I would love to come out and meet you guys next Saturday. I am just wondering what PBTB is? I am thinking it has something to do with Pelahatchie Bay something or other. Let me know and I will be there my man.
A few of us Saturday Morning ADV Breakfast regulars will be out of town this coming Saturday, so maybe some others will commit to being there to meet you. I hate for the new guy to show up the first time and no one be there!!
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Old 05-29-2013, 08:50 AM   #12668
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Hey BackwoodsKLR, I am out of town this weekend as well. I am shooting for next Saturday 6-8-2013. I have my ride down to Orlando that has me leaving at 6a.m. this Friday morning.
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Old 05-29-2013, 09:31 AM   #12669
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MSR, it was an NGK plug, replaced it with an Autolite. About 25% of the threads closest to the combustion chamber are just gone like someone took a large drill bit and just wallowed them out. I think the head would have to be pulled again to attempt any repair of those threads. The new spark plug sticks out the same amount as the old one but now about 25% of its threads are exposed. It would make me feel better just to replace the head when I have the chance. Plus, if I sell it, I don't want to sell something that has had issues with the motor.

Edit: On a side note it's time for a new rear tire and I'm tired of changing it every 2,000 miles. Anyone have any suggestions for a good high mileage tire? I was thinking about a TKC 80 because Thunderhart has had good luck with his.
10-4 on the plug. Is that a DPR8EA-9 (4929)?
I personally, wouldn't run that bike with exposed plug threads.
A good thread insert would be a permanent repair for that head.
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Old 05-29-2013, 09:48 AM   #12670
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Check sizes on the shinko 700 too. That's what I'm running on the KLR. Its a little more aggressive than the 705's but its wearing really well. Definitely will get more than 2k miles.
Edit: they do come in 4.60-18
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Old 05-29-2013, 09:50 AM   #12671
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actually they aren't exposed. at lest not like you think. We should have taken pics although i dought they would have done it justice.

Picture this if a plug has one inch of threads. starting from the tip moving up to the crush washer, the first 1/8th of a inch of threads are there, battered but there, the next 1/4 inch are gone, think what it would look like it you stuck a drill bit in at angle and rolled it around letting it chew the threads out, now the last 5/8s of threads are perfect. so {[]{{{{XXXXX= the { are good threads and the [] is the bad spot, Honestly i would use some anti-seize and run it. find a good used head, have it port and polished and let it sit until the big bore is done,
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Old 05-29-2013, 10:15 AM   #12672
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actually they aren't exposed. at lest not like you think. We should have taken pics although i dought they would have done it justice.

Picture this if a plug has one inch of threads. starting from the tip moving up to the crush washer, the first 1/8th of a inch of threads are there, battered but there, the next 1/4 inch are gone, think what it would look like it you stuck a drill bit in at angle and rolled it around letting it chew the threads out, now the last 5/8s of threads are perfect. so {[]{{{{XXXXX= the { are good threads and the [] is the bad spot, Honestly i would use some anti-seize and run it. find a good used head, have it port and polished and let it sit until the big bore is done,
I would expect no less from a man that could break an anvil (and probably fix it too).

You forgot the tuned exhaust. Next you would have him race Perry Mt.

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Old 05-29-2013, 11:01 AM   #12673
MSrider
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Originally Posted by Switchblade315 View Post
actually they aren't exposed. at lest not like you think. We should have taken pics although i dought they would have done it justice.

Picture this if a plug has one inch of threads. starting from the tip moving up to the crush washer, the first 1/8th of a inch of threads are there, battered but there, the next 1/4 inch are gone, think what it would look like it you stuck a drill bit in at angle and rolled it around letting it chew the threads out, now the last 5/8s of threads are perfect. so {[]{{{{XXXXX= the { are good threads and the [] is the bad spot, Honestly i would use some anti-seize and run it. find a good used head, have it port and polished and let it sit until the big bore is done,

Ok. good description. That tells me there is plenty material left for an insert to repair it without being exposed to combustion flame. Lots easier than pulling the head and buying a used one.

You and your race motors.....port, polish, big bore nothing has a chance around you does it?
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Old 05-29-2013, 11:23 AM   #12674
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Hey he already has a FMF pipe and jet kit in it. And he's the one talking about doing the big bore not me, I'm just saying if he's going to do that why not go ahead and have a head worked to complet the package.

Speaking of Perry Mt. I need to see when the next fun ride weekend is over there. And if y'all think I'm power hungery ya will lover this, my next mod to do to my little GMC S-15 is to get the throttle body from a late 80s chevy 4.3 V6, port the intake on my 2.8 V6 and put dual exhaust on it.
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Old 06-01-2013, 03:05 PM   #12675
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Pool pump is repaired and the pool is being drained as I type this. Should have it cleaned, refilled, and the chemicals right by next weekend. Who's up for some swimming and BBQ?
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