blueing on exhaust of eBay Ambo bike

[redrider90]

What caused that good awful bluing on the Ambo eBay bike? I do think I have ever seen a muffler blue like that.
https://www.ebay.com/itm/1971-Moto-Guzzi-Ambassador/302757211346?hash=item467dbc6cd2:g:bbwAAOSw0cJbBehL

[Idontwantapickle]

Wow! That is not good. Maybe the ignition advance is stuck, that and some ill carbs will wreck some chrome pipes.

Hunter

[Ncdan]

Extended idling in hot weather conditions causing over heating will blue pipes. Not good for the pipes or the motor.

[John A]

doesn't show the left side pipe, I wonder if that's worse

[Turin]

The one pic of the left side looks okay. The pattern is odd.  Could that be deliberate? Seems that it's a new fashion trend to make it look like your bike is out of tune.

[Triple Jim]

My guess is incompletely burned mixture coming out the exhaust and continuing to burn.  That could happen from an overly rich mixture and/or very retarded timing.

[John A]

the big bore needs to be checked out, if they used a set for an 850 the piston deck height will be wrong and could be part of the tuning problem

[fotoguzzi]

the engine number has a VG prefix, wouldn't that make it a Convert, G5 or SP motor?

VG216102

[fotoguzzi]

the engine number has a VG prefix, wouldn't that make it a Convert, G5 or SP motor?

VG216102

?



I sent question to seller, never heard back.

[redhawk47]

If that was a modern V7 I would say that the plug/cap/wire was shorting and not firing the fuel, sending raw fuel down the pipe to be burned in the cat. I don't know when they started putting cats on motorcycles.

[fotoguzzi]

I did now get an answer thru ebay,
"It was running lean is all. It's been corrected. No damage. It's not a conversion kit. It's an original 1000cc motor from a newer bike. Thanks!"

[JACoH]

"No damage", except for the blued chrome exhaust pipes! And it is listed as a Bobber!  Nowadays, sellers call anything that is missing parts or bastardized, a bobber or cafe racer kitted.

[redrider90]

"No damage", except for the blued chrome exhaust pipes! And it is listed as a Bobber!  Nowadays, sellers call anything that is missing parts or bastardized, a bobber or cafe racer kitted.

  Yep and they claim 1971 Moto Guzzi Ambassador - fully restored " and "new chrome". Really those pipes are "new blue chrome". Someone made a huge mistake setting up the fuel/timing on that bike to get that much bluing.

[Chuck in Indiana]

fully restored..   

[redrider90]

fully restored..   

Can you claim a bike is fully restored after putting 20K miles on it after the so called restoration? At what point is it a used bike again. After all full restored implies a like new bike and this "ain't" no like new bike. It might be light blue (chrome) but not like new. 

[John A]

The one pic of the left side looks okay. The pattern is odd.  Could that be deliberate? Seems that it's a new fashion trend to make it look like your bike is out of tune.

I thought the pic "artfully" hid the left side. It might be an ok bike but not at that price

[twowheeladdict]

"No damage", except for the blued chrome exhaust pipes! And it is listed as a Bobber!  Nowadays, sellers call anything that is missing parts or bastardized, a bobber or cafe racer kitted.

Bobber implies bobbed fenders which this bike does not have.  They just pick a word that is popular at the moment to get a hit during searches.