Inside the MS151T - MS150 vs MS151

[blsnelling]

I love my little MS150 but was curious to see how the newer MS151 was different, or even possibly better. Interested in the condensed version? The MS151 looks to be identical to the MS150 with only a couple small exceptions. The 151 is said to have a domed piston. I won't be tearing it down that far to get a look at it. The muffler outlet is a little bigger. And the carb and coil have different PNs, although identical visually.

In all cases, the 151 is on the left, or the first picture.

Empty, bare powerhead only. Only 0.2 ounces difference in weight.

Dry, with B&C.

Identical except for the muffler outlet.

 

[blsnelling]

The cylinders appear nearly identical externally.

Full of fuel and oil.

Opened up muffler.

Compression after the first warmup and heat cycle. This MS151 has about 7 PSI more compression this MS150.

 

[blsnelling]

Initial impression on first startup...

The MS151 has much better throttle response and spool up than the MS150. The MS150 was very cold natured, very difficult to even get it to take any throttle at all at first. Grant it, this is a sample of one and could likely be tuned out. However, I wanted to test these just like they come out of the box.

Once the muffler was modded and the ignition was advanced, the MS150 is an ENTIRELY DIFFERENT SAW. Throttle response become INSTANT. My local tree guy considers them nearly useless stock, loves them once they have these simple mods. We'll be seeing how the MS151 compares with the same mods. Videos will be coming later in the week.

 

[Stihl 041S]

Who’s the new guy?

 

[Stihl 041S]

Loooking forward for this

 

[blsnelling]

Wow. This place is dead!

 

[Vintage Engine Repairs]

How do you post so many pictures? I can only do 10 per post!

 

[blsnelling]

How do you post so many pictures? I can only do 10 per post!

By not having a life and making nearly 54K posts here! Lol

 

[Woodslasher]

Yeah, the only way to get any action here is to show a saw built out of aftermarket parts (haters will come), engage in good natured banter (haters will come), or post in the off topic section (it will turn into political stuff, then name calling). I'm watching, though. I love looking through your old build threads, they are so detailed I feel like I'm looking over your shoulder while you work. I'm also bummed out I didn't get a chance to have you port one of my saws, unless you want to briefly come out of retirement?

 

[Stihl 041S]

Yeah, the only way to get any action here is to show a saw built out of aftermarket parts (haters will come), engage in good natured banter (haters will come), or post in the off topic section (it will turn into political stuff, then name calling). I'm watching, though. I love looking through your old build threads, they are so detailed I feel like I'm looking over your shoulder while you work. I'm also bummed out I didn't get a chance to have you port one of my saws, unless you want to briefly come out of retirement?

Yeah. Used to be you had to switch back and forth between pages to not miss an answer. Take out the oil threads and .....

 

[Robin Wood]

Both saws arent strato?

 

[blsnelling]

Both saws arent strato?

I believe they are, as seen by the divider in the carb. I've never had the cylinder off one of these.

 

[RedneckChainsawRepair]

Think I saved this pic off my group Brad.

150 underneath

 

[trains]

Wow. This place is dead!

Nope, were all just busy.


Love my 150, watched your earlier vids, and did the same about 7-8 deg advance, the mm was pretty much what the 151 has now.
it rips.

 

[Stihl 041S]

Page 2!!!!!
Doesn’t anybody build saws anymore?

 

[ndlawrence]

Page 2!!!!!
Doesn’t anybody build saws anymore?

Nope. This place is dead...

 

[Stihl 041S]

Nope. This place is dead...

He is one of the guys that helped so many to learn to port
There used to be a bunch of porters here.
And not the Hoof Rasp Gang and Bark Box Gang...... Lol
Soooo many build threads are here.

 

[lone wolf]

Page 2!!!!!
Doesn’t anybody build saws anymore?

I do but i cant get any ! Have any 200 t
parts?

 

[Stihl 041S]

I do but i cant get any ! Have any 200 t
parts?

Oh I know you do!!!!!

Very few parts left.......mainly weird P&C for builds.
And some wrap handles.
Stuff to keep till the last build

But with you I might trade some parts & cash to go through my 200t&200
Running. Just not well. Bought used

 

[Jed1124]

Good to see you here Brad. Hope you are doing well.