Project Stumpbroke 71cc Sweedish Stratos

The good Lord has blessed me with the opportunity to build two saws back to back that are the same but will be receiving different treatments. I have a brand new Jonsered 2172 and a well used Husky 372 X-TORQ that needed bearings & a new piston. I had the go ahead to do whatever I wanted to the husky, but the owner of the Jonny wanted to keep it a true strato.

The plans are to build the husky & do away with the split induction so that it pulls fue/air mix through the stratto ports also. Basically the same thing I do to the MS261. It will be receiving a Tilly carb off of a 385xp wich is pretty much a direct swap.

The Jonny will be built to keep it a stratto. Other than the induction it will be the same as the husky. This will hopefully answer a few questions about which way produces more power. Ill also be throwing a standard ported quadport 372 in the mix for the test vids to see how the old generations stack up against the new X-TORQs.


I think the orange is prettier


But some prefer the black over red colors.

opcorn:

awsome! can't wait.... love my newly aquired budget X-torq....

Now on to the fun part. Dissection and modification.

The husky needed new bearings, seals, and piston kit before I could proceed with the mods. It was a rather well-used machine that looked to have had it's share of time in the woods.


OH MY!!!!

Stumpys Customs said:

OH MY!!!!

Click to expand...

You letting most of that in there? Lol

opcorn:

Both saws will be getting the sqishband cut.

Stock


Squishband cut before porting


and after



Plenty of material to remove from the intake port, but no widening since the piston is narrow between the stratto pockets

Plenty of work went into the transfers.








The exhaust got plenty of attention too.

With all the port work done I had to remove the dividers in the intake boot and the filter base.

Before I got started on the Jonny I wanted to do a comparison vid between the two. I put a fresh edge on the chain & set the rakers to .030". With the saws warmed up & tuned, the jonny to 13,500 & the husky to 14,300, I was ready for the showdown.

I think The husky turned out ok.:msp_wink:
[video=youtube_share;6X6_En0Cod0]http://youtu.be/6X6_En0Cod0[/video]

Nice clean work!! patiently awaiting the results.

Edit. that was fast.

3/4 the way through the video... No husky yet... Something wrong... I don't think so!

Now on to the black topped Swede. Gotta love the new saw smell.

All the port work is identical on both the cylinders except for the intake.

Aint they a cute couple?


Now for the results of the gains to the jonny.
[video=youtube_share;1NsR7nS7t5I]http://youtu.be/1NsR7nS7t5I[/video]

Now is time for some answers. Which one is faster? The jonny with the stratto ports still functional or the husky that is flowin nothing but air/fuel mix through all the ports. Stop watches ready??

[video=youtube_share;KGayMLbNruE]http://youtu.be/KGayMLbNruE[/video]

Great Job!!!

Stumpys Customs said:

Now is time for some answers. Which one is faster? The jonny with the stratto ports still functional or the husky that is flowin nothing but air/fuel mix through all the ports. Stop watches ready??

Click to expand...

Looks like the Husky was ahead by a hair short of two full seconds.

Another question that has been asked is which version can you get the most out of, the first generation 372 with quad ports or the new gen with the stratto top end. I've had allot more experience with the quad ports, but not sure right now what else I can do for the X-TORQ's.

[video=youtube_share;Wd3aKW9Oads]http://youtu.be/Wd3aKW9Oads[/video]

Jacob J. said:

Looks like the Husky was ahead by a hair short of two full seconds.

Click to expand...

I think the extra work that goes into gutting the intake tract is worth the extra ponies.:msp_biggrin: