1978 Triumph T140E

1978 Triumph Bonneville

Triumph Bonneville 1978 technical specifications

Condition: Used
Item location: Austin, Texas, United States
Make: Triumph
Model: Bonneville
Year: 1978
Mileage: 13,979
Engine size: 750
Vehicle Title: Clear
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Description

For sale, itter-sweetly, s my 1978 Triumph T140E Bonneville. If you're looking for a stock 70's Triumph, ou'll find nothing more road-ready and complete. First kick starter. Bike is the rare Tawny Brown over Gold color scheme. Clear Ohio title in my name. Odometer at 13,979 mi.
The 1978 T140E was released in the United States with a slightly modified carburetor tuning, s compared to the British T140, o meet strict US EPA import requirements...thus the E at the end of T140 for "Environmental". I have converted the carburetors on this bike to the original T140 specs and the performance increase can be felt. The Amal MKII carburetors have been completely rebuilt to those specifications using Brand NEW Amal parts, rdered directly from Amal in the UK (for which I have all receipts).
Beginning with the specifications of that conversion:
210 Main Jets
15 Pilot Jets
35 Choke Jets
#3 slide
3.5mm Primary Air Jets
2A1 Needles (set in middle position)
.106 Needle Jets
New Main Jet holders
New floats with new Amal Stay-Up Floats
New viton-tipped float needles
New float bowl gaskets
New Float bowl drain washers
Brand new plunger, hoke assemblies!!!
Originally, he bike was tuned with the following components, ll of which are included in the sale:
200 main jet
2C3 needle
106 needle jet
#3.5 slide
25 pilot jet
50 choke jet
Both carburetors have fresh, ew intake rubbers (old ones are included) pairing them to the cylinder intakes and new foam rings between the air filters and carb intakes. For anybody who knows about tuning and troubleshooting the fuel delivery systems on these bikes, aving new choke plungers and air intake hoses, long with the complete carb rebuild, nocks out a lot of potential issues that commonly manifest due to part wear over the years.
Boyer Micro-MKIV electronic ignition, unlop D404 Tires, uasa Battery, ni NU-3005 foam air filters.
Recent upgrades:
New Internal Oil Filter (mesh tophat)
Emgo Dunstall Reverse Megaphone Mufflers (the pipes sing quite beautfully)
DID Drive Chain
New Engine Kill Switch
New Lucas 3-way Headlamp Switch
2 New Emgo 6v Ignition Coils
New Battery Seat Rubber
New Foot Peg Rubbers and Grips
New Tachometer Drive
New Petrol Tank Steady Rubbers
New Oil Cap with Dipstick
New Rocker Box Inspection Cover Gaskets
Wide-stance scrambler handle bars
The only real modification from stock is the installation of an additional in-line oil filter. I chose the M.A.P Cycles replaceable oil filter. It is installed in-line between the oil pump return and the frame reservoir. This filter modernizes and supplements the bike's primitive wire mesh oil filtering mechanism and aims to prevent build-up of sludge within the notorious "sludge trap" (which requires the engine casings to be split and the drive shaft removed in order to clean it). It's a $99 upgrade that could prevent hundreds of dollars of damage. If you'd rather run it with the stock oil filter only for some reason, you'd simply need to remove the MAP filter from the return feed and that's that.
Recent Maintenance:
Front master Cylinder completely disassembled and cleaned. Front Brake caliper disassembled and cleaned. Freshly bled and topped off brake fluid. Float height set, gnition timing has been strobed, alves set (.006" exhaust, 008" intake), rimary chain adjusted. Engine oil has always been changed every 1500 miles (I always use Brad Penn Grade 1 High Performance Oil with ZDDP), owever I'd advise you to act as I do and change the oil/adjust the drive chain upon purchasing so that your maintenance logs are enacted immediately. Bike is always on a Battery Tender when parked at home and is protected from the weather by a car port and a Dowco bike cover.
Extras included with bike:
3 Complete Manuals:
Official Triumph Workshop Manual For Bonneville 750 and Tiger 750
Haynes 650 & 750 Twins 1963 and on
Haynes 650 &750 Twins 1963-1983
Two New Replacement Oil Filter Elements for MAP oil filter
3 New Carburetor Float Bowl Gaskets
All of the original Carb components for spare (needles, hoke assemblies, loat needles, 00, 20, 30 and 250 Main Jet pairs, loats, #3.5 slides etc....)
Two Rubber Carb Intake Seals
Spare Taillamp and mounting bracket
Spare Headlamp Pilot Bulb
Spare Float Bowl Drain Crush Washer
New Spare Condenser
New Chain Tensioner
Box of 30A Fuses
Two Brand New Triumph Passenger Foot Peg Rubbers
Spare Oil Filler Cap
New Battery Tray Rubber
11 New Spark Plugs (7) NGK B6ES, 4) Champion N5C
This bike runs beautifully, ulls strong, ounds amazing for a T140 Bonneville and has a unique look. As of right now there are no looming issues or maintenance due. It leaks the amount of oil (or less than) you'd expect from an old Triumph. Park it overnight after riding and you'll see a few drips on the ground. Please feel free to contact me with any questions that you may have.

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