Triumph Rat Motorcycle Forums banner
1 - 4 of 4 Posts

· Registered
Joined
·
83 Posts
Discussion Starter · #1 ·
I had a plug come loose and broke off it's electrode and in the process ding a valve. I repaired the bike and she came back stronger than ever. The valve job made such a big difference to the bikes pull.
3000 miles later I'm riding along and all of a sudden pop....popopopoppopoo. I can hear the compression cycle. I shut it down and towed it home. When I pulled off the air box the center coil was half way blown off. When I removed the remaining screw holding it on it broke in two. The plug was completely backed out of the threads and electrode gone.

I share the wrenching on the bike with a mechanic that comes to my place. When this first happened I blamed him for not seating and compressing the crush ring on the plug. The crush ring on this plug is not crushed. I can't believe he would make the same mistake twice. He's is a good mechanic and was vigulant after the first glitch. I'm thinking that the threads in the head are somehow not letting the plug go all the way into the head thereby not crushing the ring. I'll see when the head comes off.
Has anyone else had a plug back out?
 

· Registered
Joined
·
83 Posts
Discussion Starter · #3 ·
Now that makes sense. I'm sure he used his own tool to tighten the plugs. Oh, It did brake off the electrode the second time :hammer: Thanks for taking the time to post your response.
 

· Registered
Joined
·
83 Posts
Discussion Starter · #4 ·
Well the bike is back together now after having the plug threads "chased" and the valves reset.
I ran a test while I had the head off. We put plugs in and tightened them up. Once we thought they were tight enough we backed the plugs out to look at the crush rings. Two of the three were not crushed. ***???
After the "chase" it seemed to work fine. I guess junk was getting into the threads and gunking up the last couple of them. So they felt tight but never were.

I did a ring job while I in the engine that deep.
I got a great tip on how to pull out the cylinder sleeves.
Clean the sides of the cylinders to remove all of the oil. Put duct tape around the cylinder when the piston is all the way at the bottom of it's stroke. Crank the cam and the sleeve will come right up with the piston. Saves you from buying the "special" tool for doing this and works better anyway.
The bike is running great so far. I can't get on it yet as I'm still breaking it in.
Has anyone else been through this other than me?
 

· Registered
Joined
·
83 Posts
Discussion Starter · #6 ·
Doing the valves was about 400
Rings were 240
Gaskets were 350
Labor was about 300
I did most of the prep work and rebuild. The head was done at a shop where they reseat the valves and replace guides. I work with a mechanic that comes to my place, that makes it much cheaper.
 
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top