Engine misses and cuts out briefly on 98EV

[antmanbee]

I have ordered some 12V led lights with pig tails to use for testing.

[rodekyll]

From the description it strikes me as a single cylinder drop out as though it's losing spark or sticking an injector.

[pehayes]

Carefully trace the spark secondary wires from the plugs all the way back to the coils.  Any cuts or chaffing to the wire insulation?  Guzzi did a poor job of routing these wires are the factory.  I have seen two where the wires chaffed and allowed spark to jump to ground instead of through the plug.  Replace as necessary.

Patrick Hayes
Fremont CA

[John A]

You'll find it, intermittants are the hardest. You'll go back over stuff you've already checked as you begin to pull your hair out but keep after it and you will at least learn stuff and sucess will be worth it.

[LowRyter]

took my EV out this morning and did 30 miles,  ran great, only one cough.

Seems to be getting better on it's own.  Almost perfect. (knock wood)

[Kiwi_Roy]

Perhaps you are fixing it by riding more

Possible causes
Ignition switch resistance improving with use - needs cleaning
Disconnect battery negative
The contact block is held on by 2 Phillips screws from underneath
When you get it off the white contact plate tilts out
Replace the hard old grease with fresh Vaseline
Inspect the connector where it plugs into the loom at headstock
Fix the wires to the switch cover so they don't flex and break at the solder joint


Swap out the stand relay with one of the others in case it has a dodgy normally closed contact

[izzug otom]

As Roy says "Swap out the stand relay with one of the others in case it has a dodgy normally closed contact".

Also the relay for the electronic ignition if your bike has one. The elec. ign. wiring diagram for your model should show if there is one.

Good luck, I've been doing battle myself lately, one of those two relays made a huge difference.

Cheers, Martin

[antmanbee]

Well I got my LED lights to test with.

I have the light hooked up to fuse 1 and it stays lit constantly while the bike is sputtering and dying.

So means that the ignition switch, wiring or stand relay is not faulty. (relay was already replaced)

 

[Chuck in Indiana]

Good start.