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Posted: Thu Sep 08, 2011 6:06 pm Post subject: The never ending restoration
Hi everyone I'm the new guy! I have a really hard restoration. It's a 1974 yamaha TX 750A., I'm not from Texas, from R.I. I bought it 6 yrs. ago basiclly it was together but mice got to the wirers . Got a manual on disc. It's handy with wireing diagram.
I still have never heard it run so if i ever get it started i'll do the rest,but now what I've done, new battery, 2 sets of points, 2 coils, plugs and wires. I've also rebuilt carbs #1 carb is missing 1 float of the 2, carb #2 has both. So far no spark just a very light on on the right cylinder ,good compression, by the way parts a very hard bike to find some parts for, used i just don't trust.. Any suggerstions ???
The TX 750 was only made for the USA for only 2 yrs. It has a bad reputation, the 73 was bad the 74 the problem was fixed????
So if any one has done one let me know with any suggestions for parts from other bikes that fit and what they are would be greatly appiciated
This is my 6th bike, 54 BSA, 67tiger,72 CB750, 85 GL1200 best shouldn't have sold this one, 2003 HD lowrider,and now the TX750.
Well talking to long, hoping to hear from you all.
Joined: Oct 02, 2006 Posts: 2050 Location: New Britian, CT
Posted: Thu Sep 08, 2011 6:45 pm Post subject:
I know about the TX750, and its development,etc. By the end of the model's run they pretty much figured out all the problems, such as oil cooler, larger oil pan,etc. One thing I will suggest you do is run a synthetic blend in it. What was found out that this bike performed better with synthetic, as it would turn the natural oils to whip cream. Other then the usual places CMSNL, Speed and Sport, send me a message through this forum I happen to have a TX750 in pieces, and a lot of hard to find NOS stuff for that model. Unlike those places I am close by in Connecticut. Finally welcome to the forum, we would be glad to hear news about your projects status as well.
Joined: Oct 26, 2007 Posts: 1143 Location: Greensburg Pa
Posted: Thu Sep 08, 2011 7:02 pm Post subject:
Welcome to VJMOG txman. So you've had this project going for six years and you haven't lost interest in it yet? Now that's determination! Post a few pictures and maybe with a little encouragement from us, you can finally finish it up and get it out on the road.
...........Paul _________________ �77 CB550f
�77 CB750a
�78 GL1000
�80 CB650c
�75 GL1000-finally finished
�79 KZ200
68 CB450K1-taking up all my time
Joined: Jul 14, 2010 Posts: 23 Location: New Hampshire, USA
Posted: Thu Sep 15, 2011 4:08 am Post subject: Re: The never ending restoration
TXMAN74 wrote:
Hi everyone I'm the new guy! I have a really hard restoration. It's a 1974 yamaha TX 750A., I'm not from Texas, from R.I. I bought it 6 yrs. ago basiclly it was together but mice got to the wirers . Got a manual on disc. It's handy with wireing diagram.
I still have never heard it run so if i ever get it started i'll do the rest,but now what I've done, new battery, 2 sets of points, 2 coils, plugs and wires. I've also rebuilt carbs #1 carb is missing 1 float of the 2, carb #2 has both. So far no spark just a very light on on the right cylinder ,good compression, by the way parts a very hard bike to find some parts for, used i just don't trust.. Any suggerstions ???
The TX 750 was only made for the USA for only 2 yrs. It has a bad reputation, the 73 was bad the 74 the problem was fixed????
So if any one has done one let me know with any suggestions for parts from other bikes that fit and what they are would be greatly appiciated
This is my 6th bike, 54 BSA, 67tiger,72 CB750, 85 GL1200 best shouldn't have sold this one, 2003 HD lowrider,and now the TX750.
Well talking to long, hoping to hear from you all.
Welcome, I had one back in the day... and again now. The '74 is a great bike, has all the durabilty enhancements retrofitted on the '73's.
When I dragged it home from the auction:
And after some mechanical restoration:
And recently after some paint, and other restoration
Hi everyone, pretty hectic week or so! These are the weeks that keep me from working on the bike often!! thats why it's taken me 6yrs. I'll probably have some pic's soon, have to get condenser installed (have to buy it first) and put tank and seat on and exhaust,not stock (have to find set,cheap). Seat is also not stock, pan is so have to rebuild that to...But have to hear it run 1st.
Concours pic's are great. I really like the look of the TX750 I rode on in 73 when I worked for a dealer in Hudson, NH. By the way I'm from RI but live in MN. short riding season,
Well to get back to the project, does anyone have other ideas on why have no spark??????
Also, hanging exhaust not in manual and it's been 6 yrs. since I took it off ?? can't remember what pieces are usrd to mount it, closeup pic's would be helpful.
Joined: Jul 14, 2010 Posts: 23 Location: New Hampshire, USA
Posted: Fri Sep 16, 2011 3:17 pm Post subject:
Hudson Cycle is still in business.
There is a "P" shaped clamp that holds the pipe to the frame down at the pipe/muffler joint. The pipe also bolts to the frame right beside it. The muff hangs by the footpeg bolt. done.
Thanks Concours, the picks help alot. Is hudson cycle still Gill's Yamaha? My kids still live in Manchester.
Got the condenser yesterday found it in cambridge mn. at larson cycle,an old yama dealer. Still no spark on the left side!!!!! Any sugguestions? Maybe I'll go back and check all the electrical connections and wires maybe I'll build my own harness. Still haven't heard it run yet but i'm getting close, i hope?
Pictures coming probably tomorrow. By the way your's looks great. I really like the lines and look of the TX. Again thanks.
Joined: Jul 14, 2010 Posts: 23 Location: New Hampshire, USA
Posted: Sat Sep 17, 2011 5:30 pm Post subject:
TXMAN74 wrote:
Thanks Concours, the picks help alot. Is hudson cycle still Gill's Yamaha? My kids still live in Manchester.
Got the condenser yesterday found it in cambridge mn. at larson cycle,an old yama dealer. Still no spark on the left side!!!!! Any sugguestions? Maybe I'll go back and check all the electrical connections and wires maybe I'll build my own harness. Still haven't heard it run yet but i'm getting close, i hope?
Pictures coming probably tomorrow. By the way your's looks great. I really like the lines and look of the TX. Again thanks.
Jack
I would check the wires from the points, where they attach to the points, where they exit the points cavity, where they run over the chain area, even where they leave the engine (mine had crimp butt connectors from a previous engine removal wire chopping) all weak points. Disconnetc ot both ends, do a continuity check. Check for voltage at the coil (primary)swap coils? swapped plugs?
Joined: May 12, 2007 Posts: 275 Location: Ontario, Canada
Posted: Sun Sep 18, 2011 9:50 am Post subject:
Say Concours, I'm curious about the enlarged sump most notable on the third picture. Is that part of the Yamaha factory enhancement kit that was to be retrofitted to all 1973's? Is that what all 1974's should look like. I gotta say I haven't seen one that large before.
Joined: Oct 02, 2006 Posts: 2050 Location: New Britian, CT
Posted: Sun Sep 18, 2011 12:33 pm Post subject:
The enlarged sump is indeed part of the enhancement kit that was used on all the earlier models up to '73. It was one of the things that the bike really needed besides the oil cooler, and the synthetic blends. Yamaha in the early 70's needed a big bike to compete with what everyone else had out at the time, rushed this bike into production without doing a complete development program or else they would have caught these problems. It took them years before they had a bike to successfully compete with Honda's larger CB series and Suzuki's GS series.
Joined: Nov 02, 2008 Posts: 1085 Location: New Zealand
Posted: Sun Sep 18, 2011 1:54 pm Post subject:
But but but...as I have probably said before on this forum...the qualities of the machine in terms of 'feel' for the rider, at least for this rider anyway, were confidence inspiring. It appeared to be light, responsive to body english, responsive in the steering.I felt immediately 'at home' on one in the same way that every KTM I've ever ridden fitted like a well worn glove. Ironic that all these years on vertical twins,and triples are making a big comeback.
Joined: Oct 02, 2006 Posts: 2050 Location: New Britian, CT
Posted: Sun Sep 18, 2011 3:26 pm Post subject:
Yamaha got everything right on this bike in terms of suspension, frame,etc. But when it came to the engine, they didn't work out all the problems. If they gave the motor a bit more development time I think this is a bike that would have been superior to the CB750 in so many ways. I am saying this as a person who thinks the CB500 is superior to the CB550, in regards to the same characteristics.
Joined: Jul 14, 2010 Posts: 23 Location: New Hampshire, USA
Posted: Sun Sep 18, 2011 5:48 pm Post subject:
Bentwheel wrote:
Say Concours, I'm curious about the enlarged sump most notable on the third picture. Is that part of the Yamaha factory enhancement kit that was to be retrofitted to all 1973's? Is that what all 1974's should look like. I gotta say I haven't seen one that large before.
hehehe... I hear that all the time. I have nevr heard it all refered to as a kit. It was one of the multitude of peice meal retrofits to help stop the failures. If you peruse the TobyFolwick site, and read the bulletins, it's clear they had no idea what was really causing the problems. I read about a racing tuner who, to prove out his hypothesis, sawed a window in the oil tank, and screwed in a plexiglass window. The foam was very visible, and the balancer shaft whipping the oil in the sump waiting to be scavenged was the culprit. The sump extension simply moved that small puddle of oil down away from the rotating balancer weight. The oil cooler shown on my bike was an attempt prior to that, when they knew they had oil problems, but not why.
Joined: Jul 10, 2008 Posts: 1639 Location: Galveston County, Tx.
Posted: Mon Sep 26, 2011 12:49 pm Post subject:
TXMAN74 wrote:
I guess the tx750 isn't the only thing I can't get fired up!!!!!! I can't seem to post my pic's computer say's to many pixils, Help please.....
Maximum size allowed on this forum is 799 x 599. Now that is if you are posting the pics as 'Attachments'.
Any slightly larger pics would have to be posted through image hosting websites such as 'Photobucket' wihich of course has image editing.
Edit: Ooops.....This turned out to be a TRIPLE post I made......that's a first. I was on another computer awhile ago....something seemed goofy. Can't delete the other two now that another post has been made after mine. Sorry about that......call me a post hog.! _________________ _________________________________
GONE.......WITH A PUFF OF SMOKE AND A BLUR OF SPOKE........
_______________________________________
Last edited by dorT500 on Mon Sep 26, 2011 2:23 pm; edited 2 times in total
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I have nevr heard it all refered to as a kit. It was one of the multitude of peice meal retrofits to help stop the failures. If you peruse the TobyFolwick site, and read the bulletins, it's clear they had no idea what was really causing the problems. I read about a racing tuner who, to prove out his hypothesis, sawed a window in the oil tank, and screwed in a plexiglass window. The foam was very visible, and the balancer shaft whipping the oil in the sump waiting to be scavenged was the culprit. The sump extension simply moved that small puddle of oil down away from the rotating balancer weight. The oil cooler shown on my bike was an attempt prior to that, when they knew they had oil problems, but not why.
