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https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl Picogroup Area (contact administrator for access) >> Picogroup Motorcycle Discussion >> Ignition coil Amp https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1686178032 Message started by James H on Jun 7^th, 2023 at 2:47pm

Title: Ignition coil Amp
Post by James H on Jun 7^th, 2023 at 2:47pm

Never seen a ignition coil amp ramp like this. Comments? Bike is intermittent no start.

https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?action=downloadfile;file=Pri_V__Sec_V__Pri_A.psdata (18604 KB | )

Title: Re: Ignition coil Amp
Post by JÜJA on Jun 8^th, 2023 at 2:50am

The current probe may be pickinig up noise from the secondary, especially after primary shut off.

Is the current ramp the same on no start compared to starting/running?

Is there more than.one coil?

Screenshot__48__002.png (273 KB | )

Title: Re: Ignition coil Amp
Post by HarleyMike on Jun 8^th, 2023 at 5:52am

Agreed on the noise.

I try not to diagnose coil failure by using "ramptronics" but look at the difference in these 2 ramps, also the difference in dwell. Maybe something or maybe nothing.

What controls the ignition timing? crank sensor , cam censor? Maybe worth a look at those inputs.

ramp.PNG (50 KB | )

Title: Re: Ignition coil Amp
Post by James H on Jun 8^th, 2023 at 10:27am

It is a single cylinder. I did notice the difference in Dwell....It is transistorized ignition and uses a VRS sensor (2 actually) to determine ignition for better resolution as it is kickstart. I have scoped both of those and they look clean and good.

Title: Re: Ignition coil Amp
Post by James H on Jun 12^th, 2023 at 12:42pm

Wiring Diagram

https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?action=downloadfile;file=System.pdf (342 KB | )

https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?action=downloadfile;file=Wiring.pdf (432 KB | )

Title: Re: Ignition coil Amp
Post by HarleyMike on Jun 13^th, 2023 at 5:55am

Is it possible the condenser is not absorbing the left over energy and that is the additional spike we are seeing in the current ramp?

That sorta spike could definitely blind an ECU momentarily.

Title: Re: Ignition coil Amp
Post by James H on Jun 13^th, 2023 at 6:40am

The capacitor is there for starting as it has no battery, a couple of kicks charges the cap from the alternator which allows enough voltage for ignition and fuel pump for starting, then is a non essential for running.

Title: Re: Ignition coil Amp
Post by HarleyMike on Jun 13^th, 2023 at 9:50am

James H wrote on Jun 13^th, 2023 at 6:40am:

Interesting, Ive never tested a bike ignition. Other than the method of starting it seems very "car like"

James H wrote on Jun 13^th, 2023 at 6:40am:

The capacitor is there for starting as it has no battery, a couple of kicks charges the cap from the alternator which allows enough voltage for ignition and fuel pump for starting,

Givin' the complaint, More of a reason to take a peek at it. [smiley=maglass.gif].