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Old 02-22-2013, 10:48 AM   #74011
toastmuncher
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Quote:
Originally Posted by Rusty Rocket View Post
cam chain tensioner.
Thank you Sire.
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Old 02-22-2013, 10:56 AM   #74012
Adv Grifter
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Quote:
Originally Posted by planemanx15 View Post
I recently Big bored my bike. I went for a ride today, and while on the highway it started to make a very loud metal sound and died when I pulled over. I restarted the bike, and rode slowly home. Initially I thought the valves came undone, but after checking it, the sound remains. Any suggestions?

Sounds serious. Take it apart, start over. Something has broken or is out of spec. Probably an assembly error. Hope not too much is ruined internally.
Good luck.
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Old 02-22-2013, 11:03 AM   #74013
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Quote:
Originally Posted by Adv Grifter View Post

Sounds serious.
I don't think it's inside the cylinder or it would've quit during that demo.

Cam chain maybe. auto decompressor or balancer??? don't run it anymore.
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Old 02-22-2013, 11:03 AM   #74014
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If you have the nerve to run it anymore you may be able to isolate the source by: holding a piece of heater hose to your ear and the other end close to diff areas of the bike. OR with handle of a large screwdriver stuck in your ear and touch the tip to diff spots on engine.
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Old 02-22-2013, 11:26 AM   #74015
Rob.G
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Quote:
Originally Posted by planemanx15 View Post
I recently Big bored my bike. I went for a ride today, and while on the highway it started to make a very loud metal sound and died when I pulled over. I restarted the bike, and rode slowly home. Initially I thought the valves came undone, but after checking it, the sound remains. Any suggestions?
That's not good at all. Frankly it sounded louder on the left side to me...

If it were my bike, I would pull the head. See if the piston might be hitting the valves.

If that looks good, I would be tempted pull the clutch and see if there's anything going on down there, since you did the clutch before the big bore.

Next step, I'd pull the cylinder and inspect it, the piston, the rod, etc, etc, etc.

And I think somebody else suggested draining the oil too -- look for metal shavings in there. If there are, then we have a big problem.

Rob
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Old 02-22-2013, 11:49 AM   #74016
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I agree with Rob . Its a lot of money invested in the engine , Better be safe then sorry. I know its crappy to think about the work but it may save you replaceing the entire thing.
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Old 02-22-2013, 11:53 AM   #74017
Rob.G
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Originally Posted by PPCLI-Jim View Post
I agree with Rob . Its a lot of money invested in the engine , Better be safe then sorry. I know its crappy to think about the work but it may save you replaceing the entire thing.
As much as it sucks to have to tear into it again, it'll go much easier, since you've already done it once. Same with reassembly. And you'll be that much better at it, and know your bike that much better.

I still wonder if it isn't the cam chain tensioner. I've been thinking about this a lot. The bike ran fine for a while, until you really went and rode it. So something has gotten out of whack since then. It's not like it started off sounding like this. So... what could it be?

Years ago, I bought a used Polaris RMK800 snowmobile. Turns out the top-end was fried. I ordered a new jug and a pair of pistons and R&R'd it. Went for a ride. It ran pretty good. The only odd thing was when I shut the motor off, it stopped. Instantly. Like, it didn't turn over one or two more times, it just STOPPED. I found that odd.

Long story short, one of the circlips holding a piston on came out. You can only imagine the mess it made. I'm amazed the thing ran at all. But it ate the head, both pistons, one jug, and dinged up one of the rods. What a mess. I ended up replacing the entire top end with a (used) ported top end, and had a new rod put on the crank. Rode it twice more and sold it. Lost my ass on it of course. :)

Rob
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Old 02-22-2013, 12:50 PM   #74018
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Kinda sounds like piston slap...
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Old 02-22-2013, 02:25 PM   #74019
Carl Childers
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Originally Posted by sandwash View Post
Or you can buy a momentary mini switch from Radio Shack,fits inside the housing.

Any online source for this switch? My stock starter switch took a hit and probably won't last much longer. I live many miles from the nearest Radio Shack.
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Old 02-22-2013, 02:37 PM   #74020
Carl Childers
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[QUOTE=planemanx15;20785269]I recently Big bored my bike. I went for a ride today, and while on the highway it started to make a very loud metal sound and died when I pulled over. I restarted the bike, and rode slowly home. Initially I thought the valves came undone, but after checking it, the sound remains. Any suggestions?

I'll weigh in with the other reply's to this.......

Don't even start it again, tear it down and have a good look before any more possible damage can occur.

Like Rob I've been there and done that!
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Old 02-22-2013, 02:45 PM   #74021
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[QUOTE=planemanx15;20785269]I recently Big bored my bike. I went for a ride today, and while on the highway it started to make a very loud metal sound and died when I pulled over. I restarted the bike, and rode slowly home. Initially I thought the valves came undone, but after checking it, the sound remains. Any suggestions?

Here is a video of the sound:

When my car made that sound I tore the engine apart and found that the crank bearings were chewed up pretty bad...
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Old 02-22-2013, 04:33 PM   #74022
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Just took apart the top end to see if its the CCT. I reset it and the sound got lower, but still there. Then I adjusted the valves again, its still there but again lower. Could this be as simple as bad gas? I just filled it using a container of gas from months ago, and then put a bunch of lucas fuel stabilizer in there. I also changed the oil, it was pretty nasty, I will check for metal when it settles.

EDIT: Update: Tomorrow I'm going change the fuel. The gas I put in is old and I just realized the lucus stuff I used was opened and last used 3 years ago. Maybe its causing part of an issue. After that, I'm going to take the whole thing apart and see if the piston top has any marks from the valve on it. If it does, what needs to be done to correct that?
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planemanx15 screwed with this post 02-22-2013 at 05:40 PM
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Old 02-22-2013, 05:13 PM   #74023
3DChief
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Start/kill switches

http://www.advrider.com/forums/showt...=634120&page=3

See post #40 about new starter/kill switches. Don't mess with makeshift switches or repairs, do it right once and be done with it forever!

Tim
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Old 02-22-2013, 05:55 PM   #74024
Carl Childers
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Quote:
Originally Posted by 3DChief View Post
http://www.advrider.com/forums/showt...=634120&page=3

See post #40 about new starter/kill switches. Don't mess with makeshift switches or repairs, do it right once and be done with it forever!

Tim

WOW, that's great, thanks 3D!
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Old 02-22-2013, 07:40 PM   #74025
jessepitt
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Quote:
Originally Posted by planemanx15 View Post
I recently Big bored my bike. I went for a ride today, and while on the highway it started to make a very loud metal sound and died when I pulled over. I restarted the bike, and rode slowly home. Initially I thought the valves came undone, but after checking it, the sound remains. Any suggestions?

Here is a video of the sound:

I hate to be a pessimist but to me that sounds like a bent valve (Contacted the piston during high rpm freeway ride), it sounds like its not seating and hammering itself a new shape. Sounds like its running very poorly as well? Doesnt seem to want to rev? Dont run it more or you risk trashing an expensive head. This is a bummer man and I feel for you, but be thankfull that it seems to be top end not trans related so you probably wont end up splitting the cases. I may be totally wrong but theres a chance that I'm right so I would just tear it down.
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