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#699598 - 06/25/17 11:12 pm What's that noise?  
Joined: Nov 2008
Posts: 2,669
desco Online content
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desco  Online Content
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Joined: Nov 2008
Posts: 2,669
Bishop, Calif.
I hate threads that start like that. Did my spring maintenance on the 68. Change fluids, lube,adjust valves and primary chain. About a mile into the maiden voyage something went SCHREEEEECH for maybe a second. Bike still runs and idles, but between about 2,000 and 3,000 rpm there is a terrible metal on metal rattle. Sounded like something in the headlight or a coil banging on the gas tank. No such luck. Checked all the work I had just done. Not my fault it seems. I have 100/105 lbs cold compression, kind of afraid to run it till it's hot to check again. Too hot to be in the garage in the PM. 100/106 and work starts in the AM again tomorrow. Need to get a few ideas on what to look for so I know what I'll be doing next weekend. Thanks.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
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#699603 - 06/25/17 11:50 pm Re: What's that noise? [Re: desco]  
Joined: Jun 2007
Posts: 5,450
HawaiianTiger Online content
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HawaiianTiger  Online Content

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Joined: Jun 2007
Posts: 5,450
Maui Hawaii
Yep, my money is on a partial seizure. You'll be doing at least a top end job unless molten metal has found it's way into the crankcase. Then my recommendation is a total strip and clean out.
I tried doing it the easy way once. Lasted about 100 miles before the bottom end went.

Don't run it now.

Sorry bout that, but sh*t happens....to us all eventually.

Cheers,
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
#699606 - 06/26/17 12:08 am Re: What's that noise? [Re: desco]  
Joined: Aug 2010
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Bola Offline
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Bola  Offline
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Posts: 588
Toronto, Canada
Did you actually open the primary cover or simply adjust the chain. I'd start there. If the bike was running fine before maintenance a seizure sounds a bit harsh.

#699614 - 06/26/17 1:06 am Re: What's that noise? [Re: desco]  
Joined: Aug 2001
Posts: 6,664
Jon W. Whitley Online content
Jon W. Whitley  Online Content



Joined: Aug 2001
Posts: 6,664
Vermont
Possible blown head gasket ?


Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
1955 Tiger 100 - Project
1970 BSA A65F 650 - Project

#699624 - 06/26/17 3:43 am Re: What's that noise? [Re: desco]  
Joined: Jun 2007
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HawaiianTiger Online content
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HawaiianTiger  Online Content

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Maui Hawaii
Many seizures happen right as the bike warms up. The pistons are expanded before the cylinder catches up. It's the most critical time. I think more seizures happen in colder weather as the cylinder stays cooler longer.
I can't think of anything else that would explain the screeching sound that didn't last long.
If the head gasket blew, wouldn't the sound not go away?
But keep us informed what you find. I love a good mystery.
Cheers,
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
#699643 - 06/26/17 10:29 am Re: What's that noise? [Re: Bola]  
Joined: Nov 2008
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desco Online content
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desco  Online Content
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Bishop, Calif.
Bola, Pulled the primary to clean the goo out of everything. Took the clutch apart too. One of the first things I re- looked at was the chain tension. All is well.

HT, I've had several seizures. Most went away by letting the motor cool then rocking the bike back and forth in gear to free the piston. This time the motor never stopped. What's got me concerned is the loud clatter. If it was full time it would be a tear down, but it's only part time and the bike runs well. I too like a good mystery but not in MY garage and not at 105 degrees.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
#699671 - 06/26/17 4:30 pm Re: What's that noise? [Re: desco]  
Joined: Oct 2009
Posts: 264
Buckshot1 Online content
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Buckshot1  Online Content
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Posts: 264
Old Hangtown, Kalifornia
Exhaust spigots tight?


Michael

currently owned by a 72 T120R
maker of plunger conversion jig
#699677 - 06/26/17 5:00 pm Re: What's that noise? [Re: desco]  
Joined: Aug 2010
Posts: 588
Bola Offline
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Bola  Offline
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Toronto, Canada
Broken valve spring. I once had the smaller inside spring break. Still ran but noisy only some of the time.

#699696 - 06/26/17 7:20 pm Re: What's that noise? [Re: Bola]  
Joined: Nov 2008
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desco Online content
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desco  Online Content
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Joined: Nov 2008
Posts: 2,669
Bishop, Calif.
I've checked all the easy to get to stuff. I can pull the top end in a couple of hours on a Sat. morning. At least I can quit wondering what's wrong. Putting it back together might have to wait till late fall. Old faithful is still a rider.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
#699874 - 06/28/17 1:02 am Re: What's that noise? [Re: desco]  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
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RF Whatley  Online Content
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Joined: Oct 2003
Posts: 11,108
North Georgia, USA
Originally Posted by desco
I have 100/105 lbs cold compression.....


Way low, or you didn't do it correctly.

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#700480 - 07/02/17 5:23 pm Re: What's that noise? [Re: desco]  
Joined: Nov 2008
Posts: 2,669
desco Online content
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desco  Online Content
BritBike Forum member

Joined: Nov 2008
Posts: 2,669
Bishop, Calif.
Well, it's apart. Nothing obvious on the clatter but it could use some rings. Head gasket is oily as is the combustion chamber. Filled the chambers with acetone. No leaks at the seats. Lunch time.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
#700517 - 07/02/17 11:06 pm Re: What's that noise? [Re: desco]  
Joined: Nov 2008
Posts: 2,669
desco Online content
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desco  Online Content
BritBike Forum member

Joined: Nov 2008
Posts: 2,669
Bishop, Calif.
Last time I pulled the head off the 72 one of the top rings was in 5 pieces. God only knows how long it was like that but it ran great. I've got a top ring from the 68. It's got an almost microscopic, jagged raised edge on the top and bottom of the cylinder side. Cylinders look like mirrors. I'll try and see if F and G is open tomorrow. Still curious about the intermittent rattle. Any ideas on things I can push or pull on to check?


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.

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