Exhaust Temp Difference

[kfz]

Evening,  Has to fit a new Disy Gasket on the old MilleGT ,of course require a re-time and quick balance of the carbs. I replaced the breather and fuel pipes while is was in there.

After re-timing the bike and warming it up to check the mixture screws, got the bike up to temp,  I put the Infra red thermoter on the exhaust Downpipes (headers) and the RH cylinder is 150'C while the LH is about 100'C  (apologies for the French units).  All things are equal, same jets, same pipes, standard airbox.

Would this indicate i have a small air leak on the RH cylinder and am running a little weak or is this normal?

Bike seems happy enough, but im not...

Kev

[nc43bsa]

Unless it has been modified, the distributor on the Mille is incapable of both cylinders having correct ignition timing.

[guzzisteve]

What he said, some came with a Bosch but the electronic one is off around 1/2 degree between L/R. Do a few more rides, could also be idle mix difference unless set with a Colortune and you got them exact same flame color. Runs good ride it!! Nothing wrong.

[John A]

Think of it as two separate one cylinder engines. On a long ride you can almost pick them out sometimes. I’ve seen , rarely, on a T3, the exhaust discoloration the same on both sides. That takes some skill and luck. That was  done by Dave Hewitt from Kansas.

[kfz]

Unless it has been modified, the distributor on the Mille is incapable of both cylinders having correct ignition timing.

Yes its modified sorry.  It converted to Points with Amplifiers. and the slots opened up in the points to get enough adjustment for both. My timing light wouldnt work on the LH cylinder for some reason so I couldnt check it (is that a clue, i will check the coil and lead.  But RH is just ahead of the mark (slightly advanced).

[Antietam Classic Cycle]

Unless it has been modified, the distributor on the Mille is incapable of both cylinders having correct ignition timing.

Well... More often than not the points plate does need to be modified, but not always. My Convert's isn't, several other Guzzis I've worked on didn't need it either. And no, I didn't get the timing correct by "fudging" the point gap.

[jcctx]

If it is tuned correctly and there are no mechanical issues the temps should be very close (+ or - 5%). Temps are major indicators for diesel tuning.

[turboguzzi]

some degrees off is ok, but not as much as you have.

you must find a way to test with strobe gun on both sides. the fact that one doesnt let you to is suspicious.

[kfz]

some degrees off is ok, but not as much as you have.

you must find a way to test with strobe gun on both sides. the fact that one doesnt let you to is suspicious.

Definitely. Planning on looking into it.

[Cdn850T5NT]

What if one cylinder has considerably-poorer compression versus the other; seems to me that that would make a major difference in running temp.

??