Efco 152 long term test

[Stihl Crazy]

Something hitting the flywheel?

You guessed it. One of the lower crankcase bolts backed out and was hitting the back of the flywheel. Bent the bolt but never hurt the case threads. New bolt and it runs fine.

 

[slipknot]

gotta question concerning a carburetor from one of these 152. If ya boogered up the needle settings so bad after you've popped the limiters. What would be a good starting point.. I always start with L 1.5 and H 1 turns on most walbro but that isn't working very well It keeps cutting out like it has an air leak...I keep chasing the settings all over the place:msp_angry:lol Hey do you guys think she has an air leak or did I widen the the exhaust port too much when I did a mild port/hack to the jug...sometimes it will cut balls to the wall and make me happy until it gets hot and then starts cutting out like the low speed is set too rich. I widened the exhaust 1.5mm on each side of the port?? Anyways not trying to hijack the thread just need somebody to tell me what the factory carb settings are..pretty sure I just have an air leak...Ill get at it. This was my first attempt at a mild port job...so I'm a learnin'.

 

[Stihl Crazy]

This will get you close.

Walbro.
L= 1 1/4
H= 2 1/4

Zama
L=1 1/4
H= 1 3/8 plus or minus 1/4

I do not like the Walbro, acts as if it is governed, but distributor says it is not. Not a rev limited coil either. The last three 152s I have sold cannot be made to hit 14,000 rpm. Not an issue for work, but not good for a play saw. My personal 152 revs up to 13,400. Go a touch leaner and revs drop.

 

[slipknot]

Thanks I'll give that a try....


So to be clear some 152's came with a zama or are you just giving round about factory settings for each brand? Sorry...if there is another option id like to experiment....thats just how I am. thanks for the info though.

 

[Stihl Crazy]

Some came with Zama carbs C3-E9.
Walbro is HDA-205.

These are base settings. Send me an email and I will send you a copy of the tuning guide.

 

[jslandscaping]

does efco make the john deere cs 71 too becasue i dont see a saw that big on their website thanks

 

[Stihl Crazy]

does efco make the john deere cs 71 too becasue i dont see a saw that big on their website thanks

Yes the cs71 is an Emak product (Efco). The closest new model would be the MT7200.

 

[slipknot]

does efco make the john deere cs 71 too becasue i dont see a saw that big on their website thanks

Yes, Efco makes the whole line from CS36 on up to the CS81 which is the big brother to that CS71. If it says Emak on the side of the muffler or on the engine tag its an efco.

 

[slipknot]

Yes the cs71 is an Emak product (Efco). The closest new model would be the MT7200.

Woops didn't see that you had answered his question. Now that MT7200 is the same saw except it is strato or catmuffed...or is it both? All I know is that I dont plan on getting anything strato...Ive been building "crate" engines for my 152's....that way when/if an engine fails or wears out...I just drop in a new engine into the saw just like my Chevy truck...lol

 

[Stihl Crazy]

Woops didn't see that you had answered his question. Now that MT7200 is the same saw except it is strato or catmuffed...or is it both? All I know is that I dont plan on getting anything strato...Ive been building "crate" engines for my 152's....that way when/if an engine fails or wears out...I just drop in a new engine into the saw just like my Chevy truck...lol

As far as I know the 7200 is neither strato or cat.

 

[slipknot]

152 starving for fuel..

Hey SC thanks for the guide...I thought it straitened me out as the saw was running real good....after I tuned according to the guide....then I started cutting...after about 4-5 cuts in a 10in ash log....there she goes back to leaning out and starving for fuel. Like I said I was trying my hand at a mild port job...all i did was clean up casting marks on intake and scavenger ports, but I did widen the exhaust...is it possible that the intake side is not keeping up with the exhaust side and leaning out? It will rev up to max rpm if I play with the throttle...kinda blip it and let off and blip until I get up to max rpm....and it leans out. I can tune it until its too rich and then try and cut and sure enough she'll lean out. Im thinking an air leak but figured since its fairly new maybe my hack job porting caused all this...it was running great before I gave into the urge because my girl got me a new dremel for valentines day...shame on her if she ruined this $200 cylinder. I was thinking of making a new thread for this saw covering the rebuild and porting.....but didnt want to jump the gun when there is a ported 152 from Timberwolf coming that would make it much more interesting....lol..right SC?? Anywho..not trying to hijack...just keepin this thread alive.....this is like the official efco 152 thread....it needs a sticky but there arent enough efco fans out there to warrant that. thanks if anyone offers their opinion.

 

[mtngun]

after about 4-5 cuts in a 10in ash log....there she goes back to leaning out and starving for fuel.........all i did was clean up casting marks on intake and scavenger ports, but I did widen the exhaust

I agree that it sounds like starving for fuel, probably not related to the minor port mods.

The same thing recently happened with my CS62. Would start and rev normally, but had no guts in the cut. Turned out the fuel line was torn or cracked where it passes through the wall of the gas tank. Couldn't see the tear with the line in place, but the line would not hold vacuum. A new line fixed the problem.

Your problem could be the same, or a fuel filter, or a clogged carb screen, or an air leak.

 

[Great Smokies]

I go with mtngun- put a new fuel line and filter in, so then you have eliminated that possibility and are back looking to your carb. Also---are you sure you got the intake boot back on the cylinder right so it isnt air leaking?

 

[slipknot]

I agree that it sounds like starving for fuel, probably not related to the minor port mods.

The same thing recently happened with my CS62. Would start and rev normally, but had no guts in the cut. Turned out the fuel line was torn or cracked where it passes through the wall of the gas tank. Couldn't see the tear with the line in place, but the line would not hold vacuum. A new line fixed the problem.

Your problem could be the same, or a fuel filter, or a clogged carb screen, or an air leak.

I go with mtngun- put a new fuel line and filter in, so then you have eliminated that possibility and are back looking to your carb. Also---are you sure you got the intake boot back on the cylinder right so it isnt air leaking?

Ive taken 152's apart and put back together about 25 times with no issues untill this time...thats why I thought it was the port work i did...which isnt too bad...i thought i did ok after reading all the porting threads. But after messing with it again....I noticed its leaking fuel real bad out of where the line goes into the tank....if thats it... I will be so frikin happy im going get a new avatar...

Also about what I mentioned before....if some of you have never seen the insides of a efco 152 and would like to see one up close in pieces... I could start a new thread "efco 152 rebuild/mild port/pic heavy". I took pics when I did all that in the intent of starting that thread but realized Stihl Crazy should be sending a efco 152 off to timberwolfs to be ported and that will be the "real deal" compared to what im doing with this saw....anyways i dont want ruin the anticipation for that saw...hopefully he goes thru with a thread about it(TW) SO if you guys dont think it will keep that from happening then tell me to start that thread and i will. If not...im happy with this thread. thanks for the opinions/help fellas.

 

[Stihl Crazy]

Start looking for air leaks as others have stated. Ran a tank thru the test saw yesterday and started to get a hint of leaning out. Ordered some tank vents. Read that some 152s had vent issues. Will know when vents get in.

I have 6 152s out working. 3 have stops still in place with no issues. 3 had carb stops removed and are getting lean issues, may be operator/tuning issues. Will know when they come back to the shop.

 

[slipknot]

I know some will disagree but every efco that I have had the carb stops removed would need retuned about ever 12-15 tanks.....sometimes it would richen....others it would lean out....The L is the biggest issue.....saw starts dying when i set it down to move a log...lean out the L a smidge and then it stays running....I used to have husky 257 and 350 and 455 rancher......same issue....wish i still had that 257....I was pressured into selling it to my boss...then he dropped it out of a tree 50ft up.....I almost cried. For those that wonder....An efco 152 will easily out cut a bigger husky 455 rancher...that thing sucked...heavy and a cat muffler....

 

[weimedog]

I know there all of this has probably been covered..as there is some real knowledge on this board and some has replied already...but go thru the standard stuff and eliminate them before getting nervous about porting.

Actually sounds like a tank vent issue to me. I had that happen to a few old Husqvarna's, one I just drilled and put in a couple of Homelite duck bills to get it to vent fast enough. Another not obvious thing would be the coil to flywheel gap...that can present almost as fuel starvation. Had that happen on my little 238 Husqvarna Hot rod project..I tore around carb & air leak issues for a day before I went back to basics.

But I'm certain the following have been covered and checked...but to review.

1) Carb issues, diaphragms damaged maybe even adjustment screws with issues..clogged jets etc.
2) Fuel line or filter issue
3) Tank Vent not working right
4) Impulse line or port clogged with dirt, gasket or gasket material
5) Air leaks around intake tract...three bond 1194 can help...also use a can of silicon and spray around those area's when its running to see if it makes a difference on how it runs..silicon will slow things down it it's being sucked in.
6) Air leak though case seals..even case gasket. Silicon can help find those as well.
7) Base gasket leak.
8) Sometimes ignition issues can present as if things are going lean...check the plug after a lean spell...is it light? That would be lean. Did you check the coil to flywheel gap? That will present like a lean condition as well. If its black & wet..ignition.
9) Of course you could either have someone vacuum test the cases..or do it your self if you have the stuff. Saw several posts showing clearly how.

 

[weimedog]

One thing I am interested in is some history on Efco. The 152 must have ancestors..what are they? Which would be the best old Efco/olympics to collect to build into giant killers for GTG? Sort of sleeper saws..one that can be built to run much better than expected..any Olympic or Efco's that can be made to play that game? I sort of want something to augment my Jonsereds as a counter to the Big three (Stihl/Husqvarna/Dolmar) at GTG's and just for fun. Sort of hoping there are some small 50-60cc Efco from the past or present that can be built to be fun.

 

[Stihl Crazy]

I know some will disagree but every efco that I have had the carb stops removed would need retuned about ever 12-15 tanks.....sometimes it would richen....others it would lean out....The L is the biggest issue.....saw starts dying when i set it down to move a log...lean out the L a smidge and then it stays running....I used to have husky 257 and 350 and 455 rancher......same issue....wish i still had that 257....I was pressured into selling it to my boss...then he dropped it out of a tree 50ft up.....I almost cried. For those that wonder....An efco 152 will easily out cut a bigger husky 455 rancher...that thing sucked...heavy and a cat muffler....

I know on mine the jets are not moving, I always check them. In over 400 tanks none have moved yet, although it acts like they have. I have an idea what it is. Had a similar problem with another brand.

 

[slipknot]

One thing I am interested in is some history on Efco. The 152 must have ancestors..what are they? Which would be the best old Efco/olympics to collect to build into giant killers for GTG? Sort of sleeper saws..one that can be built to run much better than expected..any Olympic or Efco's that can be made to play that game? I sort of want something to augment my Jonsereds as a counter to the Big three (Stihl/Husqvarna/Dolmar) at GTG's and just for fun. Sort of hoping there are some small 50-60cc Efco from the past or present that can be built to be fun.

hey thanks for the check list....good stuff there. I want to know about the history as well. I used to think the old european macs were made in the same factory.....but sawtroll says no. The best efcos I know of for sleepers is this one right here....the efco 152/952...for collecting wise...one day the 962 will be a very sought after saw. If you want GTG rep get you a efco/oleo-mac/olympyk 999F.....the biggest they ever made.....thats my dream saw.....a BEAST for sure.