Topic: why do early cb750s have........AN OIL TANK??!

[BeSeeingYou]

Anyone here have any experience with the Yamaha TX 750?
It was twin cyl. with an internal balancer. It didn't viberate like the XS650's do.
They were produced in 1973 and 1974. I owned a 1974 and that thing was fast.
Ran it against a 500 Kawaski triple and pulled him. Not by a ton, but still was ahead.
Also ran it against 1 CB750 and that was apretty even race.
I know rider iput has alot to do with it, but that TX was a nice bike.
Not sure why they discontinued it.

Hers a picture.

The 73 had some serious design flaws but with the 74 model the problems had been solved but it was too late to save the bike's reputation.  I see them for sale every so often.  Usually cheap as they have little collector value.  Last fall one was for sale locally for $500, it was mint with 1500 miles on it.  The big problem with the 73 was an oil circulation  issue and an inability to adjust the crank balancer.  Both have a very difficult to find oil filter.

[scrapvalue]

Anyone here have any experience with the Yamaha TX 750?
It was twin cyl. with an internal balancer. It didn't viberate like the XS650's do.
They were produced in 1973 and 1974. I owned a 1974 and that thing was fast.
Ran it against a 500 Kawasaki triple and pulled him. Not by a ton, but still was ahead.
Also ran it against 1 CB750 and that was apretty even race.
I know rider input has alot to do with it, but that TX was a nice bike.
Not sure why they discontinued it.

Hers a picture.

Yeah, I had an early one. Biggest POS bike I ever owned. The first models had no chain adjusters for the counter-balancer, which made it noisy as hell, leaked oil worse than either of my BSA's, and later made it to one of the bike magazine's "10 worst bikes ever made list". The Yamaha dealer in SLO told me he had been in a warehouse stacked floor to ceiling with recalled TX motors. They were a miserable failure. Even when my bike was running well, no way it could keep up with a Kawi or a Honda. (Note to self; breath deep, suppress the horrible memories again....) 

I bought mine with about 6000 miles on it in the spring of 1977.  Put almost 13,000 miles on it in just under a year and a half.
Considering the length of our summers here in N. Michigan, that is a lot.
Never had a problem of any kind with it.
Put 1 new front tire and 3 rears on it. Replaced the chain 3 or 4 times. Back then the chains were not very strong.
In Sept. of 1978 a car pulled in front of me and I totaled the bike.
Maybe it was a freak, but that thing would run.

[scottly]

[/quote]

The 73 had some design flaws but with the 74 model the problems had been solved but it was too late to save the bike's reputation.  I see them for sale every so often.  Usually cheap as they have little collector value.  Last fall one was for sale locally for $500, it was mint with 1500 miles on it.
[/quote]
Some "design flaws" is an understatement at the least. The shop manual was about half manual/half service bulletins, and most of the fixes incorporated into the 74 weren't backwards compatible to the 73s. I think I paid $350 for it in 78, plus about $200 for the gasket kit and manual. After reading the bulletins, I admitted defeat. That's when I found my heavily modded CB, and I try not to re-live that ugly experience with the TX. (breath deep, suppress.....)  

[sbparks]

Guys,

 I was pleased to read this topic because I have / had exactly the same question that the original poster had.

 I know why race cars have a dry sump engine, but wasn't sure why the design was desireable in a motorcycle.  I am always interested in the designs that were chosen and the decisions that were made by the engineers that did the work.

 So, Thanks for asking the question in the first place.  I, for one, learned from the experience.

 I am disappointed by the expression of attitude displayed during the course of the discussion. 

Scott

[754]

I got a question,  was the TX 750 Yamaha a dry sump??

[ChortlingSandcaster]

Guys,

 I was pleased to read this topic because I have / had exactly the same question that the original poster had.

 I know why race cars have a dry sump engine, but wasn't sure why the design was desireable in a motorcycle.  I am always interested in the designs that were chosen and the decisions that were made by the engineers that did the work.

 So, Thanks for asking the question in the first place.  I, for one, learned from the experience.

 I am disappointed by the expression of attitude displayed during the course of the discussion. 

Scott

Thanks for the affirmation Scott, I want to point out that it started getting choppy with the 2nd response to my question:

"You are totally unaware of CB750s. Period."


Followed up by:
Nope, just a loud proclamation of ignorance on your part.

It was kinda like right outta the blue 'you're a dummy' just because I didn't know about the oil tank, kinda surprising.
It was very confrontational as in "I'm not gonna explain the oil tank I'm gonna say you're ignorant."
It was not a cool thing to do because it was confrontational.  And it was wrong too.  I'm not ignorant about the cb750, just parts of it.  I was asking for help about something I didn't know about and in the 2nd response got called on something that is not true.   All bikes have a lot in common and this bike we all love has a lot in common with all the bikes I work on: kaw triples, cb400f, kz900, kz1000, gsxr, rd400/daytona, the list go on. 

Now, Scottly has very politely apologized for it, that was impressive and quite welcome.
And I'm super sorry if, in defending myself as we all expect each other will to when someone gets confrontational with us, if it was a distraction.   I belong to a lot of boards and when someone gets confrontational you gotta try to work it out immediately.   Sorry for my tone as I stood up for myself!  I did not come on the board here to be a ahole!!!!!

[Stev-o]

Guys,

 I was pleased to read this topic because I have / had exactly the same question that the original poster had.

 

 So, Thanks for asking the question in the first place.  I, for one, learned from the experience.

 I am disappointed by the expression of attitude displayed during the course of the discussion. 

Scott

+1.  I am relatively new to the vintage Honda scene and don't have a 750; the 550's don't have a oil tank and I just never researched why the 750 did.

[mystic_1]

I think part of the issue here, ChortlingSandcaster, is that you're obviously unfamiliar with this model and yet you seem to believe yourself an authority on their value.

That, and you recent posts come across as "SEE HOW WRONG THEY ARE AND HOW RIGHT I AM!!!!!!"

The CB750 has an oil tank because it is a dry sump design.  There are two sides to the oil pump, one pumps oil from the engine to the tank, the other pumps oil from the tank to the engine.  This information is clearly available in any CB750 manual.



mystic_1

[scrapvalue]

I got a question,  was the TX 750 Yamaha a dry sump??

Seems like I remember it being a remote oil tank. Been so long I can't remember for sure.
I know it had an external oil cooler. I'm pretty sure it tied into the return line to the oil tank.

Anyone have an external oil cooler on their CB750?

[ChortlingSandcaster]

I think part of the issue here, ChortlingSandcaster, is that you're obviously unfamiliar with this model and yet you seem to believe yourself an authority on their value.

That, and you recent posts come across as "SEE HOW WRONG THEY ARE AND HOW RIGHT I AM!!!!!!"

Show me where I said I know what cb750s are worth where I bragged about it.  show where I said 'this is the value' without backing it up with several ebay listings that are only a few days ago.  and show me where I discussed it in response to that feller's question whats it worth.  comeon moveon and stop pickin on me.  

[Doctor_D]

Not judging one bit, but I think he means your comments here:
http://forums.sohc4.net/index.php?topic=70200.msg778889#msg778889

[ChortlingSandcaster]

Not judging one bit, but I think he means your comments here:
http://forums.sohc4.net/index.php?topic=70200.msg778889#msg778889

I stand by that post.  I cited real ebay sales for a non-sandcast cb750.   I went to some trouble to get *real pricing info* for Shenanigans and I didn't make it up.  And when I found a modded-out cb750 that sold for more I pointed that out too, 'here's an exception' -- no denying I'm being reasonable about the sales, those came from ebay.

And the point I made about the 'sandcast is worth more' is not wrong either.  How do I know?  PEOPLE ON THIS BOARD and others TOLD ME SO.  And I checked it out.  

It is my assessment that several folks on here just don't like hearing the truth about modded bikes and are 'shoot the messenger' types.    Also the fact that prices have dropped a LOT over the economic conditions is affecting the pricing and folks I guess don't like hearing that truth either.  Well I spent time on my explanation to Shenanigans because he asked for help on the right price, NOT to upset people.  Keep that in mind.  

I stand by that post and here's why.  I was *answering the dude's question* about 'what's it worth.'

I went to the trouble for Shenanigans to go look up the 'Completed Listings' on eBay.
I would again offer Shenanigans the exact same advice.  Backed up with proof like I found, and dont shoot the messenger.  If you cant stand the facts then ignore it, heck -- you're not the one buying a cb750, Shenanigans is.  That pricing advice was in RESPONSE TO A REQUEST for just that information.

[ksmith0034]

 I have no problem admitting I'm a rabid idjit at various times and places.  I have never let myself feel threatened by the fact that I don't know everything,

These, my friends, are words of wisdom. ^ 

I, too, have learned that it is far greater to admit one's shortcomings when necessary and ask for the help/information needed than to simply play along for the sake of preserving one's ego.  Gaining knowledge (and friends along the way) is why I, for one, come to this forum on a regular basis.  Thank you to everyone who is willing to impart wisdom and knowledge to all in need.

[swellguy]

Not judging one bit, but I think he means your comments here:
http://forums.sohc4.net/index.php?topic=70200.msg778889#msg778889

I stand by that post.  I cited real ebay sales for a non-sandcast cb750.   I went to some trouble to get *real pricing info* for Shenanigans and I didn't make it up.  And when I found a modded-out cb750 that sold for more I pointed that out too, 'here's an exception' -- no denying I'm being reasonable about the sales, those came from ebay.

And the point I made about the 'sandcast is worth more' is not wrong either.  How do I know?  PEOPLE ON THIS BOARD and others TOLD ME SO.  And I checked it out.  

It is my assessment that several folks on here just don't like hearing the truth about modded bikes and are 'shoot the messenger' types.    Also the fact that prices have dropped a LOT over the economic conditions is affecting the pricing and folks I guess don't like hearing that truth either.  Well I spent time on my explanation to Shenanigans because he asked for help on the right price, NOT to upset people.  Keep that in mind.  

I stand by that post and here's why.  I was *answering the dude's question* about 'what's it worth.'

I went to the trouble for Shenanigans to go look up the 'Completed Listings' on eBay.
I would again offer Shenanigans the exact same advice.  Backed up with proof like I found, and dont shoot the messenger.  If you cant stand the facts then ignore it, heck -- you're not the one buying a cb750, Shenanigans is.  That pricing advice was in RESPONSE TO A REQUEST for just that information.

Use ten carefully chosen words, not 100 hundred careless ones.

[traveler]

Maybe the best bet would be to hold back and learn about these bikes, before offering advice on them.

just my .02

~Joe

[Spanner 1]

If I knew which facility you were incarcerated in C.S., I'd call the Warden and ask him to remove the computer from your cell as I'm sure your annoying lots of Forums 

[swellguy]

If I knew which facility you were incarcerated in C.S., I'd call the Warden and ask him to remove the computer from your cell as I'm sure your annoying lots of Forums 

Not trying to build my post count, but +1.

[ChortlingSandcaster]

Use ten carefully chosen words, not 100 hundred careless ones.

"Only a fool uses too few words when more are needed to convey meaning."  Anon
"A stubborn man learns few lessons and applies them everywhere."  Confucius

[scottly]

"Only a fool uses too few words when more are needed to convey meaning."  Anon
"A stubborn man learns few lessons and applies them everywhere."  Confucius

Dude, you insist on asking for it, so here it comes:
"Only a fool uses too many words when only a few are needed" (scottly)
PS you should apply your Confucius quote to your own attitude... Just my humble opinion

[BeSeeingYou]

I got a question,  was the TX 750 Yamaha a dry sump??

Yes, they do have a remote oil tank.   My guess is they did it to keep the case size down while making room for the crank balancer.  One fix on the 74 was to make the sump deeper as the balancer was frothing what oil was in the sump at high rpm in the 73.  The XS650's are wet sump.

[Quorthon]

Use ten carefully chosen words, not 100 hundred careless ones.

I couldn't have articulated my feelings better myself.

[Nikkisixx]

Oh man, I'm not usually into flame filled threads but does popcorn go with coffee? 

[seaweb11]

Well the durned thing is sorted now

[scottly]

Oh man, I'm not usually into flame filled threads but does popcorn go with coffee? 

I think the key takeaway is, some of us have come to realize the early cb750s are actually
on the planet as instigator of entertainment and contentious debates...
with 2-stroke engine overtones owing to remote oil tanks.  It requires a
'really smart guy' to get things rolling, thank god someone appeared on the scene
to get things off to an exciting start a few days back....I feel honored, despite
acute bouts of self-recrimination and horrifying doubts about my dangerously poor grasp of
early cb750s, of nuanced social cues, and of generally accepted norms of rational
behavior, and potentially suffer from notably stunted levels of mental acuity...
AMEN.

This thread would have died a natural death if you had not brought it back up again, CS. And if your latest rant is directed to Nikkisixx, well, you had better put on your flame-proof suit, as there have been posts of how he has gone WELL beyond the call of duty to help out members...
And that's all I have to say about that!

[swellguy]

Anon

Is that some sort of literary device you learned about to attach to some sort of self-dictated quote.
Really, dude, I have a 12 year old who has to get the last word in, whatever the topic. You sound no more mature than she is.
Help people here . . . seek help here . . . but don't do it at the expense of others. Frankly, you look like an anus to me. PM me if you need pointing toward sites or boards where your bravado will go over well.