Honda Motorcycles - FireBlades.org banner

1 - 20 of 37 Posts

·
Registered
Joined
·
154 Posts
Discussion Starter #1 (Edited)
Riding back to work I had a spark plug pop out of the head. I immediately pulled over and shut the bike off and pushed it a mile back to my house. I tilted the tank up and removed the air bod to find the #1 cylinder plug had come out.

Is this repairable without splitting the bike in half? I have already replaced the bike as my primary and am looking to sell it soon. Obviously I need to fix this but as I'm selling it to my boss I don't want to totally half ass the repair.

Looks like the time-sert kit is 250 new. Maybe I can get one used? or maybe do the heli coil kit?
 

·
Premium Member
Joined
·
2,404 Posts
It's very difficult to do it properly in situ.

Ideally you want the head off and get a specialist engineering company to drill it out and do the insert. They'll use a proper bench drill so it's perfectly lined up.

It is an absolute bummer, I do really feel for you.
 

·
Registered
Joined
·
154 Posts
Discussion Starter #3
I've done a time-sert on my car no problem so I am familiar with the process. the taps are usually self centering so I'm not really worried about messing it up just getting in there and the overall cost on a bike I am trying to get rid of.
 

·
Registered
Joined
·
3,553 Posts
I saw another person pulled the frame and front suspension off the bike to get access
you can effectively split the bike in two pieces. id be concerned about getting shaving falling thru into the cylinder with the head on the bike. im not sure a helicoil would be the best bet for this particular instance. id think if you got the head off the bike a good metal shop would likely have the stuff to do a time-sert and itd likely not cost any more than buying a kit. honestly pulling the head off the engine isnt all that much more work after splitting the bike. : ) ive never done either job tho so take my comments for what they are worth.
 

·
Registered
Joined
·
752 Posts
Did you inspect the threads on the plug and head? Maybe it was loose and just finally came out? Just looking at the simplest resolution first. I found a loose pug on my ZX6 years ago after three years and I was the original owner and the bike had never been worked on before. Good luck!
 

·
Registered
Joined
·
684 Posts
Threads are so shallow on the 929, it's a common problem, mine did it :( You will need the head off, to do it properly, and i haven't changed the plugs since, for fear of pulling the helicoil out, though the valves are getting done soon, so plugs will be done then.
 

·
Registered
Joined
·
202 Posts

·
Registered
Joined
·
154 Posts
Discussion Starter #11
nothing on Ebay at the moment. waiting for tax return to come them I'll get the kit. I may or may not take the head off. its a small thread area and the one I did on my car left very few filings when the bits where greased properly.

The extra step of pulling the head adds extra possibility for leakage afterward and I feel adds an extra point of failure that I would probably like to avoid. Splitting the bike apart for the repair will allow me a strait shot at the plug holes so I'm not worried about alignment.
 

·
Registered
Joined
·
154 Posts
Discussion Starter #12
Well I can get a whole cylinder head for 180 shipped it looks like. that might be a cheaper solution than repairing the one I have considering the cost of the time sert kit.
 

·
Premium Member
Joined
·
2,404 Posts
Well I can get a whole cylinder head for 180 shipped it looks like. that might be a cheaper solution than repairing the one I have considering the cost of the time sert kit.
That would be my preferred option as well, you don't have the anxiety every time you change a plug that you'll strip out the insert. Plus the head needs to come off anyway.
 

·
Registered
Joined
·
752 Posts
nothing on Ebay at the moment. waiting for tax return to come them I'll get the kit. I may or may not take the head off. its a small thread area and the one I did on my car left very few filings when the bits where greased properly.

The extra step of pulling the head adds extra possibility for leakage afterward and I feel adds an extra point of failure that I would probably like to avoid. Splitting the bike apart for the repair will allow me a strait shot at the plug holes so I'm not worried about alignment.
Check the classifieds on here, I think I saw one up for grabs last night.
 

·
Registered
Joined
·
3,226 Posts
I called Adams Metallizing in Lancaster, they did some machine work for me years ago. They will install a time-sert for $45 if you bring them the head. They're a quality machine shop so it will be properly aligned on a mill so you will have confidence it is done right.
 

·
Registered
Joined
·
154 Posts
Discussion Starter #17
I called Adams Metallizing in Lancaster, they did some machine work for me years ago. They will install a time-sert for $45 if you bring them the head. They're a quality machine shop so it will be properly aligned on a mill so you will have confidence it is done right.
Cool. thanks man!

I'll look into that as soon as I have the time to pull it
 

·
Premium Member
Joined
·
454 Posts
That would be my preferred option as well, you don't have the anxiety every time you change a plug that you'll strip out the insert. Plus the head needs to come off anyway.
If the heads are known for stripping the plug threads then I'd rather have one that's been properly modified with Timeserts. Unlike Heli-coils, Timeserts have a built in locking feature to help prevent them coming out when you undo the plug, and you still get a thread which is stronger than the original so there's less chance of any future damage.
 

·
Registered
Joined
·
3,226 Posts
If the heads are known for stripping the plug threads then I'd rather have one that's been properly modified with Timeserts. Unlike Heli-coils, Timeserts have a built in locking feature to help prevent them coming out when you undo the plug, and you still get a thread which is stronger than the original so there's less chance of any future damage.
:plus1: On our air race engines we would install inserts in all our heads, even if the threads were perfect. Time-serts are threaded bushings, not coils like heli-coils. A properly installed insert is can withstand more cylinder pressure than aluminum and has a reduced chance of thread galling being steel on steel. We were running 140" hg manifold pressure as well as nitrous in some cases. The shop I recommend charges around $10 for the time-sert, and since the already have it set up on the mill to do one, I would pay the extra $ and have all 4 done. But that's just me.
 

·
Registered
Joined
·
154 Posts
Discussion Starter #20
going to take the bike apart tomorrow. any tips or procedures to follow that might make it easier? looks like I need to detach the from and front forks from the engine and rear suspension. Sounds like a real pain.
 
1 - 20 of 37 Posts
Top