How To Modify The Zama EL-42

[jmssaws]

Drama? Ain't nobody got time for dat.

Morning randy.

 

[SawTroll]

Now after you drill it, use air pressure to blow all the swarf out......and drive it back it to the same depth, and in the same orientation that it was in when you started.

Reassemble the carb and rest assured that you will now have plenty of fuel to kill stuff with.

I would think it may be a good idea to open the venturi as well, at least when used on a ported 357 or 359? As I recall it the EL42 is 16.0mm, while the HDA-199 etc is 16.67mm?

 

[Mastermind]

Enlarging the venturi can have unintended consequences. Many times, the low pressure signal is affected and not enough fuel is supplied.

 

[paragonbuilder]

Enlarging the venturi can have unintended consequences. Many times, the low pressure signal is affected and not enough fuel is supplied.

You make it sound like these little buggers are engineered...


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[Mastermind]

Yes. Yes they are. There are improvement that can be found though.

 

[Poleman]

Randys spot on with creating other problems....you can make/get them to work but can take some major tuning and understanding of the system to make it work.

 

[Lightning Performance]

Enlarging the venturi can have unintended consequences. Many times, the low pressure signal is affected and not enough fuel is supplied.

Yup, on many carbs.
If you stay away from the critical signal areas like the low side holes, mild smoothing and porting yields much better results. That method also can create problems like swirl. Swirl is good thing in the right place but bad in the wrong one. Aska a a Q-jet spread bore with double step boosters. Their easy to f-up. I wrecked my share
Saw carbs are easy till their not :-/

 

[SawTroll]

Enlarging the venturi can have unintended consequences. Many times, the low pressure signal is affected and not enough fuel is supplied.

I'm sure it may - but as far as I know it rarely turns out that way if the person doing it knows what he is doing.

 

[a. palmer jr.]

My 359 has the Walbro carb on it. Although I've not run it a whole lot it seems to not have any problem with the carb that's on it. Maybe the previous owner tweaked it a bit..

 

[Junk Meister]

It's not needed....

"IF" I Gasket delete and Muff Mod a 2159/359 would this procedure help but not hinder the saws performance?
If it is helpful I will do it, - If it hinders I will leave it for the Porter if I decide to get a saw worked over. I read this more than once, Still marvel at the "SOUTHERN and OUTHERN ENGINEERING" everyone can MacGyver into a saw.

 

[Mastermind]

"IF" I Gasket delete and Muff Mod a 2159/359 would this procedure help but not hinder the saws performance?
If it is helpful I will do it, - If it hinders I will leave it for the Porter if I decide to get a saw worked over. I read this more than once, Still marvel at the "SOUTHERN and OUTHERN ENGINEERING" everyone can MacGyver into a saw.

It isn't really needed till serious mods are done.

 

[Junk Meister]

It isn't really needed till serious mods are done.

Thanks for The REPLY.

 

[Junk Meister]

Odd Story. I dealt for 4 -2159s' and 1 - 359. His son died (Car accident) 10 yrs ago. He said the 359 was always an easy starter, the 2159s' were problematic buggers. 2 of the 2159s' are Z EL42 ,, 2 Are W HD199. The 359 is W HD199. When I got the 359 CYL off it was Dry and a Dusty white looking, I assume it was straight gassed. Piston was scored evenly all around cyl had many small scores around it that wouldn't clean up. This saw ran 9 or 10 years after the son died. Dad said he wore it out. It was the ugly one but the clincher is he swears the J 2159s' are hard starting POS saws . The H 359s' and "ALL" Husqvarnas are far better.. When I asked him if he wanted me to fix one for him he never flinched, just said "NOPE"
Now I just want to make sure they start easy and run strong when i am done with them. I will be looking hard at the needle , spring , and setting(s) they passed vac/press have metal clamps etc. this is one of the reasons I am reading up on these carbs. Like the Walbro HDA 199 needing 15 psi popoff press to work good(er) ..
Apologies for cluttering this thread but I DID and thanks to everybody for all of the explanations and PICTUREs of this carb.

 

[Bjorn]

Hello. Can you do same mod to the Zama C3-EL32?

 

[Mastermind]

Hello. Can you do same mod to the Zama C3-EL32?

Probably...but I've never needed to.

 

[Bjorn]

Probably...but I've never needed to.

Okey, that means I have a small airleak. It is running out of fuel.

 

[thedude74]

Thanks Randy! In the process a making a husky 350 more gooder.