20 Most Recent 2001 Triumph Triumph Bonneville - Page 6 Questions & Answers

You didn't give a YEAR for your bike, so I can't narrow it down (things changed over the model years).

You can peruse the following link and see if you can find what you need:


Triumph... | Answered on Jan 31, 2014





Triumph... | Answered on Jan 30, 2014

The VIN is on the frame, by the steering neck (pre-1971), or a sticker near front of gas tank 1971-

The ENGINE SERIAL number is on the left hand engine case, just under the cylinder.

Triumph... | Answered on Jan 30, 2014

The T140/TR7 factory manual pressure recommendations for Dunlop K81 TT100 and Avon Roadrunners was 28 psi front, 32 psi rear, and 24F/24R psi for K70.

Triumph... | Answered on Jan 30, 2014

What kind of problem?

Triumph... | Answered on Jan 30, 2014


If it is indeed coming from the primary case, most likely it could be the primary cover gasket, or the oil seal for the transmission shaft that extends into the primary (the black seal around the rear shaft in the pic), that the clutch hub mounts to, or the gasket for the round plate (with the 6 screws) that the above mentioned seal presses into.

Triumph... | Answered on Jan 30, 2014

Just so we\'re on the same page, by "burnt spark plugs", you mean the porcelain tip is white with no sooty or oily residue, right?

Could be the ignition is retarded too much (with will make an engine run hot)

Spark plug gaps that are too close will not fire lean fuel mixtures.

Wrong carb jetting/adjustment.

Here is a spark plug diagnosis chart:


By "burnt spark plug", I\'m assuming you mean what the chart refers to as "overheating"

Triumph... | Answered on Jan 30, 2014

Clutch might be good, but it could be out of adjustment.

One test is with engine off, pull in clutch and cycle kickstarter a few times.

There should be drag for the first 2-3 kicks, then it should free up (the clutch plates tend to "weld up" [just a term] from heat wile running).

If not remove primary cover.

Pull in clutch lever, cycle kickstarter, and watch that pressure plate isn't "wobbling" as it turns.
If it does, you'll have to tighten 1 or 2 of the 3 clutch spring nuts to get it to turn true.

Then adjust the clutch pushrod free play.
In the center of clutch pressure plate, loosen lock nut and back off adjuster screw.
Tighten screw until it you fell it just "touch" the push rod behind it.
Back off the screw 1/4 to 1/2, hold it from turning, and lock down the lock nut.
Adjust the clutch cable so there's about 1/16" to 1/8" slack at the lever end.

Triumph... | Answered on Jan 30, 2014

I ran one of those on several 60s-70s Triumphs.....great ignition!

Both plugs fire at the same time so there is no left/right to worry about.

Remove spark plugs and gap .018. Remove timing cover (right hand side of engine) over battery ignition points.
Disconnect and tape (insulate) all battery connected wires. Better yet, unhook battery hot wire from battery terminal.
Hold breaker cam in opposite direction of rotation (advanced position) and rotate engine until the points on #1 cylinder just start to open. Note: Use .0015 feeler gauge.
Remove breaker plate, breaker cam advance mechanism, and dowel pin from internal taper if your model used a dowel pin to position breaker cam and advance mechanism. CAUTION Do Not Rotate Engine. If engine is rotated, reverse rotation until piston is down and the cylinder at least one inch before top center on the compression stroke.
Rotate engine in normal direction of rotation until piston is 5/16 from top center on compression stroke. Install magnetos adaptor plate and adaptor shaft in cam taper. DO NOT TIGHTEN SHAFT. CAUTION 1963 to 1970 Triumph unit construction twins have a different length taper on shaft and internal threads are dissimilar. Suggest checking threads and taper. 1963 to 1970 bolt has BSF 1/4 x 26 threads. 1971 and later bolt had 1/4 x 28 thread. Early shafts are marked with the letter "A". Later shafts are marked with "B".
NOTE: Some applications will require drilling and tapping engine with 1/4 x 20 for better security of magneto mounting adapter. Some customers with severe service report that they heli aced adaptor to cam cover with approximately one inch length bead, top and bottom for security.
Remove Magneto cover. With shaft slightly loose in taper mount Magneto so that points are just starting to open and bolts are approximately in center of slot (for timing adjustment later).
Carefully remove Magneto and tighten center bolt in shaft. Re-install Magneto and time. Install cover and plug wires. Hook up ground wire to a separate kill switch to ground only. DO NOT HOOK ANY BATTERY CURRENT TO MAGNETO.
Point Gap .012 to .015

Triumph... | Answered on Jan 29, 2014

Most likely the bulb is burned out.

Next likely, the oil pressure sending unit is bad.

Lastly, wiring - wire unplugged, or grounding out.

Triumph... | Answered on Jan 29, 2014


Notice the top most tooth is kind of aligned with the cover mounting bolt hole above it.

You want to be sure that the kickstarter gear does not engage the transmission shaft ratcheting gear when the kick starter lever is all the way up.

Triumph... | Answered on Jan 29, 2014

du2005 indicates it's a 1963 model, the first year of the "Unit Construction" engine (engine and transmission one unit, rather than the prior "Pre-Unit Construction engines)

1963 serial numbers run from DU101 to DU5824

Triumph... | Answered on Jan 29, 2014

Just to make sure we're on the same page, I'll assume you mean one of these:


If so, let's go to this pic:


(click pic to enlarge a little)

IF you have the terminal marked #1 (not all do), this is an additional ground, to supplement the ground from the mounting bolt (#5).
Numbers 2 & 4 are where the alternator leads plug in. Doesn't matter which, as the voltage from the alternator to the rectifier is AC current.
Number 3 (center terminal) is the "hot" lead (converted to DC voltage), and splits off in two leads, one going to the system, the other going to the Zener Diode, which acts as the voltage regulator.

Now, a few things to be aware of:

When removing or installing the rectifier, ALWAYS use a wrench to hold the "bolt head" (under terminal #1 in the illustration) to keep it from turning while you loosen/tighten the nut.
If you don't do this the "plates" will turn, breaking their internal connection(s).
In that case, you might as well take it off and throw it in the trash, and go buy another one!
Make sure the mounting is contacting clean, bare metal (no paint, rust, etc).
I usually use a piece of Scotch Brite and shine up the mounting area, put a dab of dielectric grease (available at auto parts store) and slip an external tooth lock washer over the bolt threads before inserting it into the hole and tightening with the nut:


The teeth of the lockwasher dig into the mounting surfaces, giving a better electrical connection.

Triumph... | Answered on Jan 29, 2014

Been there, done that, got the souvenir tee-shirt!

Rather than the "how", you DO realise that there are some specialty tools required, right?

Special pullers to remove/reinstall camshaft gears, special puller for crankshaft pinion gear, crankshaft locking tool, British Whitworth sockets for the connecting rods big end journal nuts, crankshaft presser to separate case halves, etc.

Also, to reinstall the crankshaft into the one crankcase, you'll need to freeze the crankshaft and/or heat the crankcase bearing, or have a press to get the crank journal seated into the bearing.

Triumph... | Answered on Jan 10, 2014

Not sure about circuit breaker, but there would be a main fuse around 30 amp. If that blows you have no power to anything.

Triumph... | Answered on Oct 24, 2013

Its a very simple wiring circuit on the Bonneville tachometer, only 3 wires, the 12 volt feed, one to earth/negative and the signal from the ignitor pack. Unfortunately the tachometer fluctuation, can be a sign that the ignitor unit is becoming faulty. If you could get the ignitor checked it would be good. Also check all the connector pins on the block connector. best of luck with your bike.

Triumph... | Answered on Oct 15, 2013

WHAT MODEL YEAR??????????????

A 1972 Triumph will have a different fix then a 2010 Triumph!!!!!!!!!!!

Triumph... | Answered on Oct 09, 2013

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