sputter-sput when hot

[Unkept]

My 02' LeMans showed the same behavior when hot.

The reflective heat tape under the tank was falling off, so I replaced that.

Also I found the evap hoses to the tank had become blocked. Cleaned/replaced those and removed the evap can and never had the hot running issues again.

I also had the 30 amp fuse issue, the fuse block was melting and the connectors kept shorting out. I took the wires and routed them to a marine grade maxi fuse holder.

Sadly I can't tell you how well that worked, as it was around the time of the valve guide failure which ended my V11 LeMans career.  *sigh*

-Joe

[guzzisteve]

Hope you found it, make sure you take the phone w/you just in case!!

[Ronkom]

Well I ran the thing 4 times today, getting it good & hot. On the road it pulls HARD- right now. Best throttle response of any Guzzi I've ever ridden. Seems to be running fine, but I can hear a slight miss at idle. Revving it up (on the sidestand) the miss is more pronounced at 4-5K w/ occasional backfire. But it never quit, was never hard to start ( I guess I didn't go far enough away from home) LOL. Nature of the miss pushes my guess to a spark issue.
ronkom 

[guzzisteve]

Did you try moving the sensor wire around once it got hot?

[fotoguzzi]

Did you try moving the sensor wire around once it got hot?

what he said.. cam sensor..

( I guess I didn't go far enough away from home) LOL. 

sad but true..

[Chuck in Indiana]

Sounds like from a process of elimination that it is likely the phase sensor, which Pete posted right off the bat. It certainly sounds electrical, and it't not likely to be a relay, fuse, connector, switch, etc. causing a miss.
Naturally, that means its fuel related..

[Ronkom]

Hey Chuck, All ideas much appreciated....no intent to dis, sorry it read that way. Was looking for assurance that the rapidly rising ohm readings as the phase sensor was heated were normal.
OK, when running & hot yesterday did indeed wiggle & jiggle wires & connections including the Phase sensor and sidestand switch (had Alice do that while I sat on the bike) NO Centerstand-UGH! Also, bike does still have electric petcock. I've been through a dying electric petcock & coil, this doesn't feel like either.
AH-ha...just had a thought, fired it up, got it warm & felt the exhaust as I revved it, I can feel the miss in BOTH cylinders. Sounds like at the same time, but won't be able to be sure until Alice gets back & can work the throttle while I have a hand behind each pipe.
ronkom   

[Chuck in Indiana]

It would be nice if you could try a known good phase sensor..

[Ronkom]

Well new phase sensor installed. Was mistaken, bike still had electric petcock....and wire fell loose when I touched it removing the tank, musta been down to the last couple strands. Replaced w/ manual. Sidestand switch disconnected (owner OK'd).  Everything insulated (see pix). awaiting delivery of deoxit grease to be used on all multi pin connectors before tank goes back on. pulled spark leads from coils..... pix show what left side looks like (yikes!) right side shiny clean like it was assembled yesterday. Whole bottom of tank covered w/reflective insulation in good shape.
So, I hope she runs sweet & true

[Chuck in Indiana]

 

Eeeks..green is not good.  I'd say that bad boy is overdue for a complete take all connectors apart and squirt some Deoxit in there..