Question about 2001 Triumph Triumph Bonneville

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The locations of both sets of points in a 1976

Im trying to locate the locations of both sets of points in a 1976 t140v.

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  • tiny_ingram Jul 31, 2009

    Im not sure of the exact specs. its my girlfriends dads bike. its been sitting for 5 years or more. I just found it in his garage and when I asked about it he just said that he hasn't had it running and was told he needed to find the second set of points. I looked through many books and online and wasn't able to find the location. It is the Bicentennial edition if that makes a difference.

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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. the locations of both sets of points in a 1976 - 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

Posted on Sep 11, 2014

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I thought that bike had a 360 deg crankshaft? Does it not fire on the lost spark principle - i.e. there is only one set...

Posted on Jul 31, 2009

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Point location


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


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

Jul 30, 2009 | 2001 Triumph Triumph Bonneville

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