Question about 1976 Suzuki GT 380

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Boyer electronic ignition

I have a Boyer electronic ignition on my bike and am experiencing misfiring. Has anyone else had similar problems with this unit?

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  • Jon Nel May 11, 2010

    Check the HT leads



    Jon

  • Anonymous Mar 30, 2014

    i have fitted boyer electronic ignition bike starts well runs well but when i use front or rear brake the engine stops its like hitting the engine kill switch

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Yes, just got it put in ,misfiring and hard to start ,kicking back to

Posted on Nov 15, 2009

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Triumph T120 1968 spark problems


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hi mate ,,i've got the same problem.<br /> i bought a basket case 550ef with no igniter unit(cdi) fitted,,turns out they're near impossible to find used,or stupidly priced...if i were you i'd go down the boyer bransden route because you don't have to buy the coils or pick ups you can get the igniter module seperately.hope this helps.........john..

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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

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2 Answers

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

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