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Not British, similar tho #758391
12/06/18 11:54 pm
12/06/18 11:54 pm
Joined: Jun 2007
Posts: 1,653
Douglasville (Atlanta) Georgia
DPO Offline OP
BritBike Forum member
DPO  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 1,653
Douglasville (Atlanta) Georgia
Ran out of luck finding anymore “barn finds” of the British type. I did however find a 1973 Yamaha TX 750 with 2,700 miles on it for $600. It’s in good condition but engine seized. Got it home, found that I couldn’t get the valve cover off unless I removed the engine from the frame (Excellent!). Tore it down to the case halves and the condition of the engine was indicative of the miles on the odometer...nothing wrong here. Removed left side cover to expose starter chain wrapped around crankshaft. Fixed that with a small modification, and went ahead and replaced rings since I was already there. Couldn’t find ANY reference on the new rings as far as orientation. Gap and cylinder bore just fine.
Started the bike with the new rings, and it began billowing tons of blue smoke from both exhaust (common manifold). Took the damn thing BACK out, found left piston scraper ring installed upside down (bevel down). No other issues found. Do you guys think that having that ring installed upside down would cause epic smoking condition? You can actually SEE a fine coating of oil in the left cylinder. (All new gaskets, new valve stem seals, valve seats and clearances checked, compression 160/160) Thanks for any insight!


If you love it, let it go. If it comes back, you've highsided!"
1973 Yamaha TX750
2005 Triumph "America"
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Re: Not British, similar tho [Re: DPO] #758396
12/07/18 1:11 am
12/07/18 1:11 am
Joined: Jul 2001
Posts: 13,193
Central Virginia
Lannis Online content

Well'ard Rocker
Lannis  Online Content

Well'ard Rocker

Joined: Jul 2001
Posts: 13,193
Central Virginia
I don't know about the TX750 specifically, but on other bikes with an oil sealing/scraping ring, turning it upside down makes the piston into an oil pump, pumping loads of oil from the crankcase into the cylinder. My guess would be yes, it COULD cause that kind of smoking.

Not many people can or will take apart a TX750 and get it running right, so you will soon be part of a very exclusive club .... !!

Lannis


You should have to pass a drug test to receive a welfare check... because I had to pass one to earn it for you.
Re: Not British, similar tho [Re: DPO] #758406
12/07/18 3:09 am
12/07/18 3:09 am
Joined: Jun 2007
Posts: 1,653
Douglasville (Atlanta) Georgia
DPO Offline OP
BritBike Forum member
DPO  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 1,653
Douglasville (Atlanta) Georgia
Yeah, it’s kind of grown on me. It’s fun to ride AND kills bugs!!!


If you love it, let it go. If it comes back, you've highsided!"
1973 Yamaha TX750
2005 Triumph "America"
Re: Not British, similar tho [Re: DPO] #758417
12/07/18 6:12 am
12/07/18 6:12 am
Joined: Feb 2007
Posts: 2,286
Atlanta, GA USA
S
Semper Gumby Offline
BritBike Forum member
Semper Gumby  Offline
BritBike Forum member
S

Joined: Feb 2007
Posts: 2,286
Atlanta, GA USA
So DPO you've got a shaft eh?


Secretly Mediocre....
Re: Not British, similar tho [Re: DPO] #758433
12/07/18 2:14 pm
12/07/18 2:14 pm
Joined: Jun 2007
Posts: 1,653
Douglasville (Atlanta) Georgia
DPO Offline OP
BritBike Forum member
DPO  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 1,653
Douglasville (Atlanta) Georgia
Not shaft drive, if that’s what you mean. I think it’s Yamaha’s answer to the Triumph line. Apparently the Japs found themselves WAY behind, and just kind of threw this thing together in an effort to compete in the 70’s. It has the “Omni phase balancer” running off the crankshaft that was meant to reduce vibration as opposed to the rubber mounting method. All it really does is add weight, and dramatically increase oil temps to the point of destruction. I got lucky on this one, as it has had a modified oil sump to counter that problem. Really powerful and fun to ride, still need tires and have a front brake issue.


If you love it, let it go. If it comes back, you've highsided!"
1973 Yamaha TX750
2005 Triumph "America"
Re: Not British, similar tho [Re: DPO] #758437
12/07/18 2:43 pm
12/07/18 2:43 pm
Joined: Aug 2001
Posts: 2,863
New Hampshier USA
MikeG Offline

BritBike Forum member
MikeG  Offline

BritBike Forum member

Joined: Aug 2001
Posts: 2,863
New Hampshier USA
If you look at some of the pictures from the 2009 or 2010 TSMR you might see one of our own with his very nice TX750. From what I understand they are a nice bike if you can get them properly sorted.

Last edited by MikeG; 12/07/18 2:44 pm.

1960 BSA A10
2007 Suzuki Bandit
1957 A10
(Used to be a Triumph here)
71 Norton Commando
17 Triumph Bonneville

Re: Not British, similar tho [Re: DPO] #758450
12/07/18 3:41 pm
12/07/18 3:41 pm
Joined: Aug 2005
Posts: 1,601
melbourne florida
B
bodine031 Online content
BritBike Forum member
bodine031  Online Content
BritBike Forum member
B

Joined: Aug 2005
Posts: 1,601
melbourne florida
YUP

Re: Not British, similar tho [Re: DPO] #758487
12/07/18 7:05 pm
12/07/18 7:05 pm
Joined: Jun 2007
Posts: 1,653
Douglasville (Atlanta) Georgia
DPO Offline OP
BritBike Forum member
DPO  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 1,653
Douglasville (Atlanta) Georgia
Yep! Turned my eccentric to snug up the balancer chain. I’ve sent off a blueprint to a local machine shop to incorporate “method 2” of the oil filter modification I found on line. It’s simply a 2.5” diameter disc, but can’t find anyone to fabricate the darn thing. Atlana cycle works is working on a estimate...


If you love it, let it go. If it comes back, you've highsided!"
1973 Yamaha TX750
2005 Triumph "America"
Re: Not British, similar tho [Re: DPO] #758670
12/09/18 2:45 pm
12/09/18 2:45 pm
Joined: Oct 2003
Posts: 11,279
North Georgia, USA
RF Whatley Offline
BritBike Forum member
RF Whatley  Offline
BritBike Forum member

Joined: Oct 2003
Posts: 11,279
North Georgia, USA
Originally Posted by DPO
Yep! Turned my eccentric to snug up the balancer chain. I’ve sent off a blueprint to a local machine shop to incorporate “method 2” of the oil filter modification I found on line. It’s simply a 2.5” diameter disc, but can’t find anyone to fabricate the darn thing.


Send me a copy. I can possibly make it for you.


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

RF Whatley
Cornelia, GA
Re: Not British, similar tho [Re: DPO] #758732
12/10/18 12:53 am
12/10/18 12:53 am
Joined: Aug 2001
Posts: 2,863
New Hampshier USA
MikeG Offline

BritBike Forum member
MikeG  Offline

BritBike Forum member

Joined: Aug 2001
Posts: 2,863
New Hampshier USA

Last edited by MikeG; 12/11/18 12:28 am.

1960 BSA A10
2007 Suzuki Bandit
1957 A10
(Used to be a Triumph here)
71 Norton Commando
17 Triumph Bonneville

Re: Not British, similar tho [Re: DPO] #758782
12/10/18 2:00 pm
12/10/18 2:00 pm
Joined: Aug 2001
Posts: 2,710
Springfield Nebraska
Richrd Online content
BritBike Forum member
Richrd  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 2,710
Springfield Nebraska
yes she is, but it's an ugly bike she's sitting on.


Rich (member ThreeMustGetBeers)
"It's not always about going fast. Sometimes it's nice to slow down" (Wendy E.2016)

69 bonney
72 commando
75 commando interstate
06 Suzu..Suzu.. uh appliance
couple of beesas a ducati
and the Snake Bike
and a Honda?
Re: Not British, similar tho [Re: Richrd] #758922
12/11/18 4:52 pm
12/11/18 4:52 pm
Joined: Aug 2001
Posts: 2,863
New Hampshier USA
MikeG Offline

BritBike Forum member
MikeG  Offline

BritBike Forum member

Joined: Aug 2001
Posts: 2,863
New Hampshier USA
Originally Posted by Richrd
yes she is, but it's an ugly bike she's sitting on.


confused confused What she??....you feeling OK?


1960 BSA A10
2007 Suzuki Bandit
1957 A10
(Used to be a Triumph here)
71 Norton Commando
17 Triumph Bonneville

Re: Not British, similar tho [Re: MikeG] #759450
12/16/18 11:56 am
12/16/18 11:56 am
Joined: Sep 2014
Posts: 211
San Miguel Tenerife
R
r.bartlett Offline
BritBike Forum member
r.bartlett  Offline
BritBike Forum member
R

Joined: Sep 2014
Posts: 211
San Miguel Tenerife
Originally Posted by MikeG

don't remember these in the UK but I never really follows the Japanese market very closely

Re: Not British, similar tho [Re: DPO] #760425
12/25/18 2:05 am
12/25/18 2:05 am
Joined: May 2010
Posts: 2,602
Illinois, USA
TR6Ray Offline

BritBike Forum member
TR6Ray  Offline

BritBike Forum member

Joined: May 2010
Posts: 2,602
Illinois, USA
Originally Posted by DPO
Started the bike with the new rings, and it began billowing tons of blue smoke from both exhaust (common manifold). Took the damn thing BACK out, found left piston scraper ring installed upside down (bevel down). No other issues found. Do you guys think that having that ring installed upside down would cause epic smoking condition? You can actually SEE a fine coating of oil in the left cylinder. (All new gaskets, new valve stem seals, valve seats and clearances checked, compression 160/160) Thanks for any insight!

The ring you found with the bevel down is the one you installed CORRECTLY. It's the other one that is pumping oil up the walls and into the combustion chamber. At least, if you mean what I think you mean by "bevel down". The largest diameter of the taper faced ring needs to be down. If you have run the engine with the rings installed, look for the shiny wear area on the ring. If that is at the bottom of the ring, it is correct.

READ THIS


'64 TR6R Plus some Twins from other countries (U.S., Germany, Japan)

Moderated by  Alan_nc, Graham Ham 

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