Question about 2001 Triumph Triumph Bonneville

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Point location i have a 76 T140V that has not been for quite some time. I was told there is two sets of points on this pa running rticular bike and I'm just wondering if this is true and where they might be located.

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The points cover should be on the right hand side of the engine, at the end of the exhaust cam shaft.


point location - point-location-xkwbzaj4qs1t5fjdyiiqbxtt-2-0.jpg
It is possible that the original plate was replaced by an aftermarket version with cooling fins. That doesn't do much, but it *looks* cooler to some eyes.

Most of these bikes have been refitted with Boyer ignition kits, so under the plate the points are no longer there. They are likely replaced with a sensor and magnetic sensor. That is a MUCH more reliable and maintenance free system.

If you do still have points, there will be two contact sets. The entire disk shaped plate will rotate to adjust timing and a smaller partial plate containing the second set of points can also be adjusted. That gives you control over timing, and difference between cylinders.

Really, I was a stickler for "original" on my bike, and I regret not changing to an electronic Boyer system as soon as they became available. Go for the upgrade. It's well worth it. A good shop can have it done in an afternoon, and you will never have to think twice about ignition or timing again.

Boyer Electronic Ignitions
http://www.britcycle.com/products/331/331_series.htm

Posted on Jan 15, 2015

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It probably does have dual points. They are on the stator side of the engine. There is usually a small, round cover, held on by a few screws.

Posted on Jul 30, 2009

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I have a 1972 Honda xl250. It sat outside for 10 years before I got it. Alls it needed was a carb and it cranked after the 4th or 5th kick. About a week later it quit running. I figured out that it was'nt...


You are probably dealing with dirty,burnt,or shorting points. Try replacing the points located at the end of the crankshaft under the cover held on by two screws. You may have to install and reinstall the points several times before you can get the new points to work. Chances are the points in the machine are almost 40 years old. Also , Honda ignition systems run off the battery. In most Honda models if you do not have a good, charged battery , you will not get spark.

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How to set points


Remove spark plugs to make engine easier to turn over.
Rotate engine until etched line on points cam lines up with the rubbing block on one of the points.
Set gap to .015"
Rotate engine 180 degrees and repeat.
Reinstall spark plugs.
Hook up timing light to left hand spark plug (cylinder #1)
Start bike and hold throttle about 2500 RPMs.
Shift point breaker plate left/right until timing marks align.
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Sep 08, 2010 | 1973 Triumph T 100 R

2 Answers

Need to find the timing marks


I am assoming that you are talking about the marks on the points plate.
Before you put the points and point plate on, check the spark advancer for proper function. Twist the point cam and it should snap back to the correct original location.
If not MARK the relationship between the point cam and the advancer base... HINT.. you can put it together backwards and the bike will NEVER run!

The points should mount up on the plate with no problems, other than check carefully where the point wire goes onto the insulated bolt and don't let the terminal end get grounded out on the point base/plate. Point plate and points should install so the points are at about 10-11 o'clock location when the plate is secured to the cylinder head. The point wire enters the point base plate at the far right and runs underneath the point cam to connect with the contact breaker on the left side.

When installing new points, be sure to check and clean the point faces of any grease or oil that is a preservative. Put a drop of oil on the felt and a light coat of point grease (if you can find it anymore at auto parts stores) on the point cam. Because the point rubbing block is new, the little high spots will wear down initially in the first couple of hours of operation, so you will probably have to come back and recheck the gap and timing after some run-in time. The gap needs to be about .014-.016" checked at the highest point of the point cam. Turn the engine over with a wrench and watch the points open and close, then observe where they are open the widest and check the gap with a flat feeler gauge. If you set them about .016", then they will close down to around .014" or so after they have seated in. This is how it is done in a perfect world of new, unworn parts.

The inherent difficulty here lies within Honda's choice to cutaway the cam bearings to facilitate camshaft installation. This area tends to wear rapidly, causing the camshaft (and point cam) to wobble around during rotation, even when the camchain tensioner is fairly snug. If you grab the end of the point cam or camshaft with your fingers, try to move it from side to side/up and down. ANY movement will translate to a change in the point gap, which makes a change in the ignition timing. If it is really loose, the timing will be difficult to set and the running timing will be erratic. The only way to fix it is to put on a new head and cam and/or POWROLL may still be able to convert the head/cam to a needle bearing design... all a lot of work and expense for a 30 year old tiddler bike.

The timing, once the gap is set properly, is adjusted by moving the point plate back and forth until the points JUST BARELY open when the F flywheel mark is aligned with the pointer mark on the case. You can check this with a 6v test light or a ohmmeter or audible test unit. Recheck the point gap when you move the plate, as it tends to change the gap. Go back and forth until you have both the proper gap and the correct point opening moment set.
This bike MUST have a fresh 6-volt battery installed to run. It is NOT a magneto ignition.
Hope this helps out. Let us know how it goes.

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2 Answers

The locations of both sets of points in a 1976


It has been a while... but I believe there is a round access cover about 2" in diameter on the right hand side of the bike, forward part of the engine.

That corresponds with the end of the exhaust camshaft. 9_11_2014_6_00_28_pm.jpg
In this photo, it is chrome plated. They are held on by two philips head machine screws.

The points themselves are mounted on two plates. The first plate adjusts both sets of points, the second adjusts the difference in the two sparks.

cf5116b7-5bf5-47c3-a398-0ea6930239d6.jpg

That said, you might be on a wild goose chase. Most of the older T120s and T140s have already been converted to Boyer electronic ignition systems. MUCH more reliable, and much less maintenance. Smoother, and more precise as well.

Boyer conversion or not, the access plate in in the same place. It just might be a "pointless" ignition.

See these guys - they have very good telephone support - and will have Boyer kits in stock.

British Cycle Supply, item 331 Series Boyer Electronic Ignitions

Jul 30, 2009 | 2001 Triumph Triumph Bonneville

2 Answers

The bike runs for almost precisely 15 minutes, then dies


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Failing all this try new plugs and leads?
Good Luck! I hope this sorts your problem? if so press FixYa blue button.
Merry Christmas!
Paul 'W'
Onyer~EDson(:0)~[><

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