044/440 cylinder "frankensteining" onto a CS-590 chassis, what is involved?

[Cerberus]

I'm just starting my research into this, have HATED that I couldn't "experiment" w/ my cs590 (jugs/everything are too expensive & only OEM), then I saw a Youtuber w/ this MONSTER cs590 73cc's like 7 or 8HP just insane, anyways I'm hoping to get thoughts here, as said I'll be effectively getting every bit of info from elsewhere I can because I have every intention of moving-forward if there's no "you are incapable dude" that I'm missing, but I haven't been able to find one yet --- but sadly the most basic part is what I fear will stop me: The simple mounting of the jug.

I've been surprised finding just how interchangeable, say, a cylinder or piston is from 1 brand to another, clearly "common sizing standards" are being used (intentionally or ad hoc) by the OEM's, anyways am curious if anyone can tell me whether it is/isn't a bolt-up situation (the super long stroke, relatively speak, of the 590 would make it an awesome candidate for over-boring, no?)

Thanks a lot am very eager hearing about this because frankly the ubiquity of both 590 powerheads, and 440 top-ends (and 660/661 intake boots, as apparently after time his unit was taking in air so he up-sized the horn to a 661's, this is years-into real usage!!) Youtuber is Dyno Joe, have been finding a LOT of great stuff from him (had no idea that proper tune had as-significant an effect on HP as it does, the charts are staggering would NEVER intentionally put "kinda rich" fuel in a powerhead again!)

 

[Ronie]

@Red97

 

[pavel408]

Hmm, some Youtuber called Dyno Joe... who is this guy?
LOL

 

[TreeLife]

I've got one that is going to go back to Joe for maintenance then is going to be sailed.

 

[Wonkydonkey]

Yeh it kinda tickles me knowing D-joe is @Red97

 

[TreeLife]

I'll be honest, pound for pound, just an absolutely excellent saw. It takes a lot of work to get the 044 jug n slug on there but what a dynamic saw. There is a thread where Joe detailed the work done on it.

@huskihl did one or two as well

 

[Hinerman]

https://opeforum.com/threads/play-time.19518/

 

[thinair]

Yeh it kinda tickles me knowing D-joe is @Red97

Not much action on @Red97 Youtube channel lately. Hopefully all is good

 

[huskihl]

I'll be honest, pound for pound, just an absolutely excellent saw. It takes a lot of work to get the 044 jug n slug on there but what a dynamic saw. There is a thread where Joe detailed the work done on it.

@huskihl did one or two as well

Only one. MS460 cylinder. It was 2 seconds faster than my 7900 that day

https://youtube.com/shorts/bupvCo1OeG8?feature=share

 

[huskihl]

Not much action on @Red97 Youtube channel lately. Hopefully all is good

He’s been welding in Wisconsin for a couple months. He’s back home now

 

[Red97]

Best advice is order a 590 base gasket. Set it on the 440/460 cylinder and slot the holes to fit.

Jb weld the case cutouts, or weld the sides of the cylinder.

Ktm 50 rod bearing or I believe the ms440 rod bearing is the same.

Widen the piston to fit the rod.

Trim anything that hits the plastic

044/46 boot will work unless you are hamfisted operator.

Cap the top muffler outlet, add one to the side and a taller muffler brace.

Pretty much all that is involved

 

[Ronie]

Best advice is order a 590 base gasket. Set it on the 440/460 cylinder and slot the holes to fit.

Jb weld the case cutouts, or weld the sides of the cylinder.

Ktm 50 rod bearing or I believe the ms440 rod bearing is the same.

Widen the piston to fit the rod.

Trim anything that hits the plastic

044/46 boot will work unless you are hamfisted operator.

Cap the top muffler outlet, add one to the side and a taller muffler brace.

Pretty much all that is involved

I've got a 440 cylinder and a 600 so that's going on my to do list, I thought it would be more involved that that.

Thanks!

 

[drf256]

How much more does an 044/46 hybrid weigh vs a converted 590?

I’ve only done a 620, and I recall it being a fatty for a saw of it’s displacement.

The coolness and stealth factor is certainly in favor of the 590 hybrid.

 

[Red97]

I'll try and remember to set both on the scales today.

 

[EAK044]

What is the length of stroke on a 590?


Sent from my iPhone using Tapatalk

 

[Red97]

37.8mm

 

[Ronie]

13lb 74cc saw, I can't wait to put one together.

 

[Wood Doctor]

Taking Stihl parts and trying to get them to work well or better on a Husqvarna or an Echo has never worked for me in 20 years. I gave up after I asked myself a simple question, "Why on earth am I trying to do this?"

 

[huskihl]

Taking Stihl parts and trying to get them to work well or better on a Husqvarna or an Echo has never worked for me in 20 years. I gave up after I asked myself a simple question, "Why on earth am I trying to do this?"

You just weren’t trading the right parts. The vid I posted above is about 2.5 - 3x faster than a stock 620

 

[Ronie]

You just weren’t trading the right parts. The vid I posted above is about 2.5 - 3x faster than a stock 620

Was you able to use the 620 carb?