Hi there, Is it OK to hijack an old thread? I like to reuse threads after all the topic is pretty similar...
I have slightly different conditions though:
Weight reduction and budget is not unlimited, rather on the sane and frugal level.

So, being a new owner for Savage, the first thing that was obvious for me: things are massive and thick heavy steel. Almost all my previous bikes had thin pressed steel or plastic fenders and here i see a lot of weight.

So what do you guys think, how much pounds, kilos, stones you can get rid of by:
- dropping rear seat, fender, the mounting subframe
- dropping the airbox, covers, toolkit locker etc from under the seat
- maybe swap out the front fender if it's not crucial for the stability of the forks.
Thanks, let me know if it should be rather posted as a new thread.

My Savage was originally a ‘96 model, but the engine now resides in an ‘86 frame.  Its name is REX.  He has gone through a couple of transitions, first it was going to a cafe but after a while I decided I wanted a more laid back style so I started the next transition to a bobber.  
Items removed/swapped:
-Front fender replaced by fork brace and a dirt bike aluminum fender.
-Fuel tank modified by RYCA.
-Seat replaced by solo seat.
-Air box replaced by RYCA  battery box.
-Side covers replaced by steel plates(later aluminum)
-Rear fender replaced with small steel trailer fender. (Aluminum later)
-Header and muffler replaced:  mild steel tube header 1.75”OD x 1.65”ID, and currently a HD Dyna muffler (works great on this bike).  
-carb replaced by 36mm Mikuni round slide and a Uni foam air filter.
-camshaft replaced by a custom grind done by Webcam Inc., with more duration and lift. (Similar to a DR650 cam but not quite as much lift)
-piston replaced by custom 97mm forged hi-comp 10.5:1 done by Wiseco.
-front brake upgrade
-suspension upgrade
Weight about 320 lbs.

Almost forgot, 6 lb. flywheel replaced by 3lb. unit.

Runs very well, plenty of power, lots of torque for passing trucks going uphill, and it’s perfect for carving out the mountain roads.

Zoom Zoom 🏍🏍

So you can drop a good 100lbs off it, that's quite something! Thanks for the writeups, very informative.

I believe I got down around 32o pounds.

My bike resembles a RYCA Cafe bike and has some RYCA parts (seat, side body panels, footpeg mounts, belt guard, sidestand), and is a pretty minimal bike without any luggage or windscreen.  I have aluminum wheel rims on both ends, a small 90/90-18 front tire, and a small front fender.  My air cleaner is a round foam clamp on without any box - I have a very light Lithium battery and clamp on handlebars.

The fuel tank is a GT550 and is not very heavy when empty - but it is 4 gallons and holds nearly 30 pounds of gas when full.  My headlight is 8" and weighs more than the tiny stock headlight.  My rear wheel pulley is a Kawasaki KZ750 pulley and is cast iron and adds a few pounds.

I believe getting below 300 pounds will require a very spindly looking motorcycle and some real effort.

I do believe that with some trimming and parts removal you could drop 20-30 pounds and still have a motorcycle that is functional.  Removing fenders really affects how the bike functions when the roads are wet - my bike throws water all over me.  The front wheel throws a strip of water upward that hits me in the center of my face shield....the front tire also throws a stream of water out both sides that goes into each shoe - the back tire throws a stream of water up my backside.  It is a great bike to ride when it is dry....pretty miserable when the roads are wet.

Supermotos? Oh yes, If I was not shorter than a duchshund!

Ok, so 150kg is difficult to reach, got it.
Fun fact:
Removed the tail assembly, fender, chrome sides, backrest, rear lamp all together weighs about 9kgs!
Chunky metal, that.