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Not British, similar tho #758391 12/06/18 11:54 pm
Joined: Jun 2007
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DPO Offline OP
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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!"
2016 Triumph Bonneville America LT
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Re: Not British, similar tho [Re: DPO] #758396 12/07/18 1:11 am
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Lannis Offline
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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


Play stupid games ... Win stupid prizes!
Re: Not British, similar tho [Re: DPO] #758406 12/07/18 3:09 am
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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!"
2016 Triumph Bonneville America LT
Re: Not British, similar tho [Re: DPO] #758417 12/07/18 6:12 am
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Semper Gumby Online Content
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So DPO you've got a shaft eh?


"Don't trust your eyes if your imagination is out of focus." - Mark Twain
Re: Not British, similar tho [Re: DPO] #758433 12/07/18 2:14 pm
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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!"
2016 Triumph Bonneville America LT
Re: Not British, similar tho [Re: DPO] #758437 12/07/18 2:43 pm
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MikeG Offline
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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
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bodine031 Online Content
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YUP

Re: Not British, similar tho [Re: DPO] #758487 12/07/18 7:05 pm
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DPO Offline OP
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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!"
2016 Triumph Bonneville America LT
Re: Not British, similar tho [Re: DPO] #758670 12/09/18 2:45 pm
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RF Whatley Offline
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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
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MikeG Offline
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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
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Richrd Online Content
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yes she is, but it's an ugly bike she's sitting on.


Rich (last remaining 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
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Re: Not British, similar tho [Re: Richrd] #758922 12/11/18 4:52 pm
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MikeG Offline
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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
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r.bartlett Offline
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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
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TR6Ray Offline
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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)

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