eskimo mako 43cc compression

[snipersam]

does anyone know off hand what the compression should be on these? mine runs good and all but I checked it for the heck of it and got 70 psi.

[Idahogator]

This question has been answered in the thread at this link:  http://www.iceshanty.com/ice_fishing/index.php?topic=152698.0

You may like doing a search ~ it's located on every page, upper left.     

[snipersam]

I did do a search on here and google. as soon as you put the word compression next to anything auger related you get something like this. "the new high compression propane auger from eskimo..."

all I am after is compression should be between x and y for the 43cc mako.

[Idahogator]

I best do a compression test on mine ~ I'll get back.>>>

[snipersam]

nobody? eskimo says 110-120 psi and they get hard to start at 90 psi.

mine tested 70psi and is 7 years old, a friends tested 77-78 psi and is 2 years old. both start well.  something seems fishy here.

[Idahogator]

Sorry for my delay of 5 days.

I totally warmed up my Mako 10 minutes per standard practice of pro mechanics. then removed the spark plug, choke open, throttle wide open, adapter and new o-ring, snug seated in the spark plug hole, attached a short-hose, calibrated Snap-on tool brand compression gauge and pulled it RAPIDLY through 6 cycles, resulting in 123 psig.  (psigauge)

The only lubricant used since new is Amsoil Sabre at 80:1 ratio with non-ethanol fuel.    This combination prevents all engine wear and retains better than new performance.

Thank you for your attention to detail.       

[snipersam]

all right I tried again. I warmed it up for 10 min. I got 60 psi. added a bit of oil and got 70 psi when its hot.

I am using a cheap borrowed kit that was just used to rebuild a snowmobile engine with no problems so I don't understand whats going on with trying to use it on the auger. New orings on the threads, soaped them and found no leaks.

the best we can see through the sparkplug hole the engine looks great. it starts in one or 2 pulls. that shouldn't be possible if compression is that low.

the first few years of its life I used any old 2 stroke oil. but the last 5 years its seen nothing but aimsoil saber at 60 to one. it ran great till the last trip out this year. fuel lines were rotten and deteriorated and the screen in the carb was totally plugged. I rebuilt the card, changed the gasket between carb and engine, new gas lines and filter, and a new spark plug. it runs super now, and for the heck of it I tested compression and this is where im at now. I am unsure what to do next......

[Idahogator]

That is a bit low for an oiled up engine.   But, it starts, runs and has the power needed for your purpose.

No accusation ~ a few folks say "break-in" and use cheap products, and too late discover broke-in is partially worn out.  So, always go with the best lubricant from day one.

You may have noticed, Amsoil Sabre has fuel stabilizer already in the product. That's one reason Amsoil says, " ADD NO OTHER ADDITIVES".   

Ethanol free fuel is well worth a long drive to obtain.

Anything else to add?            

Scroll down a bit at this link and click on your State.        http://pure-gas.org/

[snipersam]

I am going to try a different compression kit on it. see what numbers I get.

being in Canada the only choice for non ethanol gas is premium(91 octane) so that's what I always run.

thing is if 70 psi is correct it shouldn't even run. yet after the work I just did to it last week it starts first or second pull 20 times now.

[Idahogator]

I'd say you did a good job on the carb O/H.     

[snipersam]

ok I took the auger engine apart today out of boredom( ice is melted), and everything looks good. jug is good, piston is good, rings have minor wear on them on the exhaust side so I ordered new rings. now one thing I did notice the arrow on the piston was pointing to the intake side. I thought the arrow is to ALWAYS point to the exhaust side on any 2 stroke? can anyone verify?

[Idahogator]

Best view the complete manual at Ardisam.com.   

[snipersam]

I did try find a manual that shows but eskimo does not show the engine broken down, and does not sell you engine internals. However its a Chinese scooter engine and parts for them are easy to get. I also ordered a new piston I found a tiny 1/8 inch crack in this one at the skirt. I will polish the cylinder its got one slight scratch where this crack was and another one lining up with the edge of one of the intake/exhaust holes. very minor scratches but if im in there anyway........

[Idahogator]

I'm guessing you know what you're doing.     

Hm?   Non abrasive polish, like maybe jewelers rouge to a mirror finish?

Good luck and keep us posted.>>>>

[snipersam]

I am unsure as to what ill use to polish. I think I will go ask the local tech at the shop in town tomorrow. I don't really know too much about the inside of engines, but my brother has rebuilt quite a few  2 strokes before and said he would remove the scratches. again they are very minor, they cannot be felt with skin, but if you press a nail on the cylinder and kinda scratch over it you can feel a little something. 

[snipersam]

all right I finally got the parts yesterday and put it all together. new piston, rings and head gasket. I did have to remove a bit of material inside the piston where the bearing sits as I did not get a bearing and the eskimo bearing is a bit wider.

when it was all together I used the compression tester I had originally used and got 85 psi. I seriously doubted this testers accuracy, as it should not run at these numbers. so I borrowed a known accurate tester today and checked it again, and got 125 psi. perfect!

so due to the faulty tester there was probably nothing wrong with it in the first place, it did run and start perfect,  but im not sorry I replaced parts, I learnt a lot and there was a crack in the old piston skirt.

[Idahogator]

Sounds like all good news.

Great you removed that cracked piston.   Whew !

So, with the good lubricant ~ you set for many seasons.

Congrats.     
                                                         
                                                         


Tom