3XV running issues

[peteholt]

The troublesome cylinder's spark plug is very wet and oily as if it isn't firing although it seems to run on both cylinders on start up. Could this be a defective CDI unit or the coil breaking down under load? Are the CDI units prone to packing up?

Regards Pete

[yanw]

What model are you running? Does it have the Solenoid oil pump?

I ask as I had an issue where one solenoid was stuck and over-oiling one of the cylinders. That side was smoking more than the other.

[peteholt]

When I got the bike it had the oil pump disconnected and was running premix, and had run perfectly for the last 6 months until I got caught out in the rain recently.

[ybk]

Stupid question but have you put in new plugs yet?

[peteholt]

Yes fitted 2 new plugs and still not running right. Are the CDI units or coils prone to fail?

[ybk]

I've never had either fail or heard of a failure...

[mellorp]

I had exactly the same issue on mu Aprilia. It was running perfectly until I got caught out in the rain. What happened was a 4 pin connector had become particularly wet, corroded and bust the plastic connector. The connector was fastened to a frame rail and the corrosion was earthing out one of the wires. Once I released the connector so it wasn't touching the frame rail the bike ran perfectly. So a bit of cleaning and some insulation tape cured the problem.

When something goes wrong I always look to what has changed and start there.

BTW it took me ages to find the corroded connector as it was completely hidden

HTH

[Crank]

Side stand switch, could have some moisture in it and acting up when that stand is up, cutting in intermittently?

Try bypass it, worth a try!

[Edd]

Hi Scott

As I was reading te thread I came to the same conclusion. If it is crank you will smell it it is foul burning gearbox oil.

Edd

[eyrey1]

mine didnt smell bad ,must have been the other side that went
22 years isnt bad for a seal to last though is it ?
there will have been times where its not been used in a few years

[peteholt]

Will check the side stand switch and all connections along the loom to see if there is any signs of corrosion, although I have already checked most of the obvious ones. Hopefully will get a chance to have another look at this weekend. It really is frustrating as starts and runs ok but will just not accelerate without cutting onto 1 cylinder. Will check all electrical connections and report back with any findings. thanks again for all your comments and suggestions.

Regards Pete