1978 TRIUMPH BONNEVILLE 750, FULL RESTORATION OF A 9,128 ORIGINAL MILE MACHINE

1978 Triumph Bonneville

Price: US $4,550.90
Item location: Chicago, Illinois, United States
Make: Triumph
Model: Bonneville
SubModel: 750
Year: 1978
Mileage: 9,128
Engine size: 750
Vehicle Title: Clear
Contact seller: Contact form
Description

1978 TRIUMPH BONNEVILLE 750 T140 – FULL RESTORATION OF A 9,128 ORIGINAL MILE MOTORCYCLE, RAME AND ENGINE #T140CX05483
1978 TRIUMPH BONNEVILLE 750 T140 – FULL RESTORATION OF A 9,128 ORIGINAL MILE MOTORCYCLE, RAME AND ENGINE #T140CX05483

This Triumph Bonneville 750 epitomizes the early 1970’s British motorcycle that became a permanent part of British motorcycle history and still represents the classic style…

The condition of this machine fantastic, s it was completely restored approximately 8 years ago. The frame and engine numbers are factory correct and original. It is the 750 cc engine. The gearbox is also original to the machine. This Bonneville was restored from the frame up. It is a great rider and a perfect candidate for any motorcycle concours.

This machine has been in my collection for some time, s started on a regular basis, nd ridden occasionally. I’ve been in the process of downsizing my collection over the past few years, ainly because I can’t ride everything as much as they deserve to be ridden.

When I purchased the bike, t was in basically the same condition shown in the photos. Besides a complete cosmetic detailing, went through the entire machine and checked all of the major engine, ransmission, nd braking components for wear and safety. The gas tank was cleaned and the carburetors inspected, leaned, nd re-installed along with a new air filter, ll fluids were changed, nd both front and rear brakes were inspected and serviced as needed.

The tires on the front and rear are Dunlop Roadmaster TT100s, nd are the original style and size that these machine were fitted with at the factory. They are in almost new condition. The wheels have also been restored to the original specifications and are in beautiful condition.

The seat cover, hile it might be original, s in almost new condition, nd the seat pan is also very nice. There is a very small pin hole in the seat cover on the lower side. The seat is at a trim shop right now, nd they are confident they can repair the hole, s it is almost unnoticeable now. The original exhaust pipes (both commonly replaced and now very hard to find in original condition) are both very nice. I can't tell for sure if they are extremely nice original pipes or have been restored, ut either way, hey look great.

The engine, ransmission, nd all related mechanical parts were re-built when the machine was restored, nd are in excellent interior condition.

A complete cleaning and detailing was performed before the photos were taken, nd although the bike was restored 8 years ago, he overall condition of the finishes is still amazing, nd is in line with the original mileage. The aluminum and chrome parts are in excellent condition overall.

The paint was applied in the original color scheme along with the correct tank badges, hich is a US spec teardrop version and original to the machine. The paint on the tank and the sidecovers is in stunning condition.

The Triumph on the road is very easy to handle, nd rides down the road very tight, ith no shakes, himmies, r rattles. It shifts and accelerates smoothly and holds the road as it should.

There is absolutely NOTHING that needs to be done to this machine to ride it and enjoy it. It is also the perfect candidate for any motorcycle show and a very rare machine, s all of the hard to find original parts are accounted for. Unlike other old British bikes for sale on the internet, his one is ready to ride and not in need of any expensive service once you get it home.

I am always looking for new machines to add to my collection and love talking shop about bikes. Please contact me if you are looking for something or have something interesting available.


TERMS: $500.00 DEPOSIT WITHIN 48 HOURS OF AUCTION CLOSE. BALANCE OF AUCTION AMOUNT MUST BE PAID BY CASH IN PERSON, ANK TO BANK WIRE TRANSFER, R CERTIFIED FUNDS (WITH VERIFICATION) ONLY WITHIN 7 DAYS OF AUCTION CLOSE. SORRY, O C.O.D. AND NO PAYPAL.

The description of this motorcycle is written to the best of my knowledge. However, am by no means an expert on vintage Triumph motorcycles. Please don’t hesitate to ask for more photos and, f possible, ome and look in person before the auction ends. ALL SALES ARE FINAL! If you have any questions, lease contact me before the auction ends.

If you have any questions, lease contact me. If you live close to Chicago, encourage you to come and inspect the motorcycle in person!

In an effort to protect the eBay user information and to help ensure the authenticity of correspondence between sellers and bidders, Bay’s new listing format does NOT display any bidder information. Nevertheless, STRONGLY encourage bidders to contact me directly to answer questions or to verify correspondence. Seller reserves the right to not accept bids or sell the vehicle to anyone with a zero or negative eBay feedback rating.

This motorcycle is being sold as is, here is with no warranty, xpressed, ritten or implied unless there is a warranty in effect from the factory. The seller shall not be responsible for the correct description, uthenticity, enuineness, r defects herein, nd makes no warranty in connection therewith. No allowance or set aside will be made on account of any incorrectness, mperfection, efect or damage. Any descriptions or representations are for identification purposes only and are not to be construed as a warranty of any type. It is the responsibility of the buyer to have thoroughly inspected the motorcycle and to have satisfied himself or herself as to the condition and value and to bid based upon that judgment solely. The seller shall and will make every reasonable effort to disclose any known defects associated with this motorcycle at the buyer's request PRIOR to the close of sale. Seller assumes no responsibility for any statements regardless of any oral statements about the motorcycle.

Please remember that your bid constitutes a legally binding contract to purchase this item. If you require an inspection, ave it done prior to bidding. I strongly encourage all bidders to inspect the motorcycle personally or enlist the services of a professional inspector prior to placing a bid. After the sale, nspections are not recognized as a contingency to completing your obligation to your winning bid. If there are any questions regarding the above terms, lease e-mail prior to bidding.

Please do not waste my time or yours bidding on an item you do not intend to pay for. If you bid on this motorcycle and win, ou are expected to pay and pick it up in a timely manner!

I welcome ALL international bidders and am happy to assist with making shipping arrangements. I can also arrange crating for shipment on my end for a nominal extra charge. If you are an international buyer, understand it can take some time to arrange shipping, o I do not mind keeping the motorcycle for a longer period of time until pick up. Please contact me before the sale ends, f possible, o discuss the specifics.

Thanks for your interest!


For more on the Triumph 750 Bonneville and the history of the Triumph motorcycle company, lease read on past the photos…


The Triumph Bonneville T140 is a standard motorcycle with a 750 cc (46 cu in) capacity engine that was designed and built by Triumph Engineering at Meriden near Coventry.

The T140 was the second generation in the Bonneville series developed from the earlier 650 cc (40 cu in) T120 Bonneville and was produced by Triumph in a number of versions, ncluding limited editions, rom 1973 until 1983 when the company was declared bankrupt. Licensed production of the T140 Bonneville was continued by Les Harris between 1985 and 1988 at Newton Abbot in Devon, hese machines became known as 'Harris' or 'Devon' Bonnevilles.

History:

The early 650 cc capacity production T120 Bonneville, ften known as the 'duplex frame' model, as replaced in the early 1970s by the T140 Bonneville, he same basic machine but with a 750 cc engine. Refined from the later 'oil in frame' version of the T120, he first few T140s, esignated T140V, eatured a larger-capacity engine of 724 cc, five-speed gearbox and indicators, ut still retaining drum brakes and kick-start. Shortly after, he engine was further bored out to 744 cc and front disc brakes were fitted (using single discs until 1982).

While originally intended for 'export only', he 750 Bonneville twin, aused so much interest among visitors to the 1973 motorcycle shows, hat Triumph decided to put the bike on the home market at the price of 679 uk pounds.

In 1975, long with engine modifications, he gearchange lever was moved from right to left to comply with new regulations mandated for the American market and a rear disc brake fitted. Several T140 models followed featuring various modifications and refinements including electric starting from 1980 until production ceased with the closure of the Meriden works in 1983.

Although this should have been the end of the Bonneville, s it turned out it was not. Triumph Motorcycles was acquired by businessman John Bloor, ho licensed a company called Racing Spares in Devon, un by Les Harris to manufacture the T140 Bonneville. These continuation bikes are known as the 'Devon Bonnevilles', hich did not reach the market until 1985, nd were not sold in the US. Production ended in 1988.

The Bonneville name:

The Bonneville name came from the achievements of Texas racer Johnny Allen on the Bonneville Salt Flats in Utah in the 1950s. The model designation of T140 continued the numbering system started by Edward Turner in 1937 with the Triumph Tiger 70, number that was intended to advertise the machine's top speed in miles per hour.

Design

Engine:

The T140 uses a 360-degree, ir-cooled parallel twin layout. Gear driven camshafts operate a single inlet and exhaust valve through pushrods in each cylinder. Twin Amal carburettors supply the cylinders with fuel/air mixture through short intake manifolds. The crankshaft drives the clutch through a triplex chain operating in an oil bath. Starting is by kick start with later versions having electric start.

The engine oil system is of the dry sump type, combined pressure and scavenge oil pump is driven by the inlet camshaft gear, ater versions of the T140 employed additional integral non-return valves to prevent oil draining into the sump. The frame of the T140 serves as the engine oil reservoir.

Chassis:

The frame of the T140 is manufactured from mild steel tube and uses a 'duplex' layout. Twin rear adjustable shock absorbers provide suspension through a swinging arm, prung and oil-damped front telescopic forks are used. The 19 inch diameter front wheel and 18 inch rear wheel were spoked with optional cast alloy wheels available from 1979 onwards. The under-seat area is occupied by the battery and ignition coils.

From 1976, he T140 had hydraulic disc brakes for both the front and rear wheels. Prior to that date, arly versions were equipped with a conical hub rear drum brake. A single leading shoe rear drum brake was specified for the last Bonnevilles proposed by the Meriden factory in 1984 but the factory closed before production. From 1982, win front brake discs were available as an option.

Electrical system:

The T140 features a standard Lucas 12 volt electrical system, arly models were positive earth with a change to negative earth from 1979 onwards. Zener diodes are used for voltage regulation. Early engines used contact breaker point ignition with electronic ignition becoming standard fitment on all Triumph's 750cc twins from 1979-on.


Early models 1973-1980

Note on country specifications:

T140V

The initial model of the T140 line was the 'V', hich stood for five-speed transmission which was a Quaife design. Developed from the Bonneville T120 by Brian Jones, he T140V was launched in 1973 in response to a decline in sales of the T120. The introduction of the Japanese four-cylinder Honda CB750 had been noted by the Triumph management board in the late 1960s, he three-cylinder 750 cc BSA Rocket 3/Triumph Trident was developed to directly compete against it.

The first model shared many of the T120's cycle parts and largely the same twin-cylinder engine bored out to 724 cc (44.2 cu in), ut this was quickly increased to 744 cc (45.4 cu in). The cylinder head required an extra mounting stud to prevent gasket failure due to the decreased distance between the cylinder bores, he gearbox components were strengthened (compared to the T120) and were further modified when gear selection problems became apparent. A hydraulic disc brake replaced the outdated cable operated drum brake for the front wheel.

Problems with vibration meant that sales were slow however, nd production was heavily disrupted by the workers' occupation of the Meriden factory in 1973. Even once this dispute was resolved, he 1974 production T140s suffered from quality control problems, ut these were resolved once the workers' co-operative became established.

T140RV:

The T140RV was an export version of the T140V with engine modifications to meet the requirements of the US market, nd the gear change lever switched to the left-hand side to comply with 1974 regulations.

1978 Triumph Bonneville specifications:

MODEL DESIGNATIONS:

1978 Triumph Bonneville T140V..................... 750cc

1978 Triumph Bonneville T140E..................... Emissions

ENGINE:

Engine type....................................... OHV vertical twin

Horsepower at RPM............................ 49 BHP @ 6,200 rpm

Bore................................................ 76mm / 2.79"

Stroke............................................. 82mm / 3.23"

Displacement.................................... 744cc / 40 cu. in.

Compression Ratio............................. 7.9:1

Valve Clearance (cold):

Inlet................................................ 0.05mm / 0.002"

Exhaust............................................ 0.10mm / 0.004"

Valve Timing:

Inlet Valve Opens.............................. 34 degrees BTDC

Inlet Valve Closes.............................. 55 degrees BTDC

Exhaust Valve Opens.......................... 55 degrees BTDC

Exhaust Valve Closes.......................... 27 degrees BTDC

IGNITION:

Ignition Breaker Gap............................. 0.4mm / 0.015"

Spark Plug Gap.................................. 0.50mm / 0.020"

Timing (static).................................14 degrees BTDC

Timing (fully advanced):........................ 38 degrees BTDC

CARBURETORS:

Type................................................ Amal Concentric MKII

Throat Size....................................... 30mm

Main Jet........................................... 210

Needle Jet........................................ .107

Needle Position.................................. 2

Needle Type.......................................D

Throttle Valve.................................... 2

Pilot Jet............................................ 25

TRANSMISSION:

Speeds.............................................. 4

Gear Ratios:

5th - Top........................................... 4.7

4th - Fourth........................................ 5.59

3rd - Third......................................... 6.58

2nd - Second...................................... 8.63

1st - Bottom...................................... 12.25

CLUTCH:

Type................................................ Multi-plate, et

Number of Plates:

Drive Plates...................................... 6

Driven Plates.................................... 6

SPROCKETS:

Engine............................................. 29 teeth

Clutch............................................. 58 teeth

Gearbox.......................................... 20 teeth

Rear Wheel...................................... 47 teeth

CHAIN:

Primary, itch.................................. 3/8" triplex

Primary, ength................................. 84 links

Final Drive, itch............................... 5/8" X .400" X 3/8"

Final Drive, ength............................. 106 links

CAPACITIES:

Fuel (US versions)............................. 2.5 Imp. gal.

Fuel (UK & export versions)................. 4 Imp. gal.

Oil Tank........................................... 5 pints / 3 L

Gearbox........................................... 1 pt / 500cc

Primary Chaincase............................. 1/4 pt / 150cc

Front Forks....................................... 6.4 oz. / 190cc

TIRES:

Front............................................... 3.25 X 19"

Rear................................................ 4.00 X 18"

SUSPENSION:

Front............................................... Telescopic Forks

Rear................................................ Swing Arm

BRAKES:

Front............................................... 10" / 12.9cm disk

Rear................................................ 7" / 17.78cm SLS

DIMENSIONS:

Seat Height...................................... 32.5" / 77.5cm

Wheelbase........................................ 54.5" / 140.3cm

Length.............................................. 85.5" / 202cm

Width............................................... 28.5" / 72cm

Ground Clearance.............................. 5" / 12.7cm

Weight, nladen................................ 395 lbs / 180kg

Bibliography:

Bacon, oy (1990). Triumph T140 Bonneville and Derivatives, 973-1988. Niton Publishing. ISBN 1-85648-305-3.

Bacon, oy (1995). Triumph Twins and Triples. Niton Publishing. ISBN 1-85579-026-2.

Clew, eff (1990). Triumph 650 & 750 2-Valve Twins. Haynes Publishing Group. ISBN 0-85696-890-0.

Davies, vor (1991). Triumph-The Complete Story. The Crowood Press. ISBN 1-86126-149-7.

Gaylin, avid (1997). Triumph Motorcycle Restoration Guide-Bonneville and TR6, 956-1983. MBI Publishing Company. ISBN 0-7603-0183-2.

Glenn, arold T. (1973). Glenn's Triumph two-cylinder repair and tune-up guide. Crown Publishers, nc., ew York.

Hopwood, ert (2002). Whatever happened to the British motorcycle industry?. Haynes Publishing Group. ISBN 1-85960-427-7.

McDiarmid, ac (1997). Triumph-The Legend. Parragon Publishing. ISBN 0-7525-2080-6.

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