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#4479592 - 08/05/17 06:56 AM Old Triumph 750 Bonneville
Silverado12 Offline


Registered: 02/26/13
Posts: 3111
Loc: Central Virginia
Anybody know anything about these bikes or where I can go for information? My brother is about to get a nice old T140? 1976 750 Bonneville. It has disc brakes front and rear, left side shifter and under 9,000 miles. It's got good compression but has been setting for a long time and won't start.
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#4479595 - 08/05/17 06:57 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
Silverado12 Offline


Registered: 02/26/13
Posts: 3111
Loc: Central Virginia


Here's a picture. Everything seems to be there.


Edited by Silverado12 (08/05/17 06:58 AM)
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#4479596 - 08/05/17 07:00 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
DdDd Offline


Registered: 06/08/17
Posts: 189
Loc: NY
A new used model is better in so many ways and will probably cost less over time.

Does he want to ride or have a excuse to whip out the 1000 piece tool kit? The old stuff was built like junk.

Dig the blue though.

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#4479598 - 08/05/17 07:03 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
Silverado12 Offline


Registered: 02/26/13
Posts: 3111
Loc: Central Virginia
It's just a toy for him. He likes old stuff and tinkering with mechanical things.
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#4479599 - 08/05/17 07:04 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
123Saab Offline


Registered: 10/27/10
Posts: 1573
Loc: PA
Fun to drive and tinker with. On a unknown bike it pays off to rebuild engine and carb, pretty straight forward stuff.
Leaks oil (Some more than others) and has quirky electronics. Nice projects and weekend short trippers.

Worth keeping stock for resale value.

http://www.triumphrat.net/forum.php
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#4479605 - 08/05/17 07:18 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
Eddie Offline


Registered: 12/07/03
Posts: 9559
Loc: Florida, Cape Coral
A wonderful bike to ride. I had one and rode it to college way back, I also had a Royal Enfield 30.50(30.5 CU IN= ~ 600CC) Tomahawk. Wonderful vertical twin engine bikes.
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#4479619 - 08/05/17 07:38 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
fdcg27 Offline


Registered: 09/25/09
Posts: 15687
Loc: OH
Looks like a nice unmolested original that was never dropped.
The no-start problem is almost certainly caused by an ignition system fault, although the carbs could likely use a tear down.
These are said to be very nice bikes to ride although in no way fast by modern standards.
This would be a fun toy to have.
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#4479621 - 08/05/17 07:41 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
DdDd Offline


Registered: 06/08/17
Posts: 189
Loc: NY
http://m.triumphmotorcycles.com/bikes/classics/street-twin/2016/street-twin

Still... probably same price or cheaper!


Dealers are swatting flies these days. Having ridden old and new, I was surprised how much nostalgia rarely lives up to the hype.

Fit, finish and materials are better than the 70s, when the Japanese were handing Triumphs you know what on a platter!

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#4479673 - 08/05/17 08:42 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
Neely97 Offline


Registered: 06/13/06
Posts: 370
Loc: Texas
Back in the late 60s I rode with some riders who had them.
Beautiful bikes but needed constant tinkering.
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#4479739 - 08/05/17 10:02 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
Langanobob Online   content


Registered: 04/24/09
Posts: 208
Loc: Reno, Nevada
I've had a '66 Bonneville for years. It used to be my daily rider, lots of fun. Definitely a hobby machine, it will take lots of TLC but worth it in my opinion. What I did was methodically go through the electrical system and get rid of everything that said Lucas on the nameplate. You could, and I think you still can, get aftermarket voltage regulators and ignition systems that are very good. If he wants to spend the money.

If it's been sitting a long time old fuel has probably gummed up the carbs. They are easy to work on.

Bottom line is that there was a reason that the original Triumph motorcycle company folded. The Japanese bikes of the era were just plain more reliable and had much better engines.

If your brother is looking for a hobby project, this might be a good one. If he just wants a neat old motorcycle to ride I'd suggest he buy one of the many newer retro bikes. In my case, the old Triumphs is just a lot of fun. Once I got it squared away I rode it across the US with the only problem being a chain replacement. But I am very close to being a professional hobbyist.

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#4479751 - 08/05/17 10:22 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
E150GT Offline


Registered: 03/11/12
Posts: 1091
Loc: San Antonio, TX
The only motorcycle I have ever ridden was a Bonneville TR120? from 1972? Beautiful bike. Not reliable. Last time I rode it, it almost caught on fire. the wiring harness was smoking.
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#4479768 - 08/05/17 10:34 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
Buy this book. THE bible for classic british bikes.

http://modernmotorcyclemechanics.com
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#4479807 - 08/05/17 11:14 AM Re: Old Triumph 750 Bonneville [Re: Silverado12]
BigCahuna Offline


Registered: 09/29/09
Posts: 2140
Loc: Deep in the heart of Jersey
Compression, fresh gas, air and spark will make it run. Check if the points are still set right.,,

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#4479940 - 08/05/17 01:39 PM Re: Old Triumph 750 Bonneville [Re: Silverado12]
02SE Offline


Registered: 12/30/05
Posts: 2725
Loc: The Canyons
A neat looking old bike, that required constant attention to keep running. Now that it's 40+ years old, it will be even less reliable. If he wants to tinker with it, and look at it, it's a great bike. If he wants to ride, he'd be better off getting a new replica version.

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#4479949 - 08/05/17 01:45 PM Re: Old Triumph 750 Bonneville [Re: Silverado12]
BigCahuna Offline


Registered: 09/29/09
Posts: 2140
Loc: Deep in the heart of Jersey
I would bet that once it gets started and he does a few hundred miles, it will perform like it did before it got parked. Great bike for bike nights, or just fair weather Sunday rides.,,,

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