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Single cylinder motorcycle


Jordan B
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Hi im using a link atom G4+ on my 4 stroke 200cc turbo charged single cylinder motorcycle my local tuner has helped me with the base settings and ive got all the essentials like spark, fuel and fuel pump working and all the sensors but the issue is it runs momentarily and cuts as it does this the rpm limit fault shows and im getting rpm readings of 17000rpm can someone please point me in the right direction please 

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Hi Jordan,

It sounds very much like you are getting a trigger error.  Unfortunately the Atom ecu doesnt have the triggerscope hardware so it makes it a little more difficult to diagnose.  Does your tuner have an oscilloscope?  What does the engine use for a trigger/s?

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Yes reversed polarity can cause it.  Also with a single cylinder the position of the gap will be quite important too.  Preferably your "gap" will pass the sensor about 90deg before or after TDC.  Do you know anyone with a "bigger" ecu like a storm or Xtreme that you can plug in to do a triggerscope?

Edited by Adamw
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Arrr that could be the issue then ive set my sensor up wrong i think the gap is 90 degrees before tdc but it fires at tdc so i will move it tonight and see if it solves the issue cheers 

no, if your gap passes the sensor when the crank is at 90 btdc (piston approx half way up bore) that is ideal already.

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