dissecting an earthquake chainsaw

[jteam]

Chris is right, the seller on the bay states 58 has a longer stroke, but the 45 and 52 share the same crankshaft. They sell a kit for $40 to move up to 52cc, 58 is around $60 since it requires the crank. Seller is IBEN5092. The site "chainsawr" has some also under "grey market " chainsaw parts.

 

[clemsonfor]

Chris and Oz, I checked the compression twice with a screw in adapter on my gauge and then a third time with one with an adapter that has a rubber cone on it that goes against the spark plug hole, but, you both have me now questioning the seal between the gauge and the adapter. The two connect with a coupling like an air compressor quick connect. I will have to investigate that further. I hope to get some time to mess with it tomorrow, but our high temp forecast is for 26 degrees. We are not accustomed to many days like that here.

Chris and Stephen, i saw the ring in the pic also and had to go look again in person. It does not look that way in person. it still had oil residue on it from my wet test when I took that pic. The ring does move freely in the groove and ill have to check the gap. any idea what it should be?

Sadly, I never even tried to start it after checking the compression. It seemed ok when pulling on the rope but I wouldn't say it was overly strong feeling.

I may clean it and piece back together and see what happens.

Two questions:

1. anyone know the initial setting they started with after their jets were reinstalled? I forgot to count the turns.

2. Has anyone found a cheap and reliable parts source for these machines?

thanks for the help guys. I will post when I know more info.

Buy another on eBay!! Seriously $42 do sent buy many parts piecemeal! Some Chinese saw parts will transfer and its the same as a red ax gz4000 so look up those parts on ereplacement parts.com

Sent from my C5155 using Tapatalk

 

[clemsonfor]

well it is 25 degrees here today, but I did do some further investigation on my issues. I used my air compressor to test my compression gauge. Set the output pressure at 100 psi and give the compression gauge a blast of it. The gauge registered 110psi. I did this several times so I have eliminated the gauge. I cleaned the cylinder up good and did some further inspection and think I have found the issue. It was a bit difficult to get a good pic with my phone but Ill post what I got. The score in the pic is above the exhaust port and the deepest part is about 3/8" long (maybe a bit more) and it starts approx 1/4" below the very top of the cylinder wall.

I read much of this three year thread and i don't remember anyone getting one this bad. Looks like I may have gotten the first DOA. Open to suggestions. Thanks guys!

Side note: if i reassemble, where do you guys try to set the squish.... .020 +- ?View attachment 329330 View attachment 329331

When you got yours they were probably scraping the bottom of the barrel. That sucks!!

I thought they said even though they were sold "as is, for parts" that " they all went through their shop and were test run"? Maybe that's what killed it?

Sent from my C5155 using Tapatalk

 

[jteam]

I'm crossing fingers that some of the folks here are right and it will run fine once back together. Unfortunately with work I won't be able to try until mid week and it's killing me to wait.

I've been watching for more auctions listed but it appears there are only a handful right now. Hopefully they didn't run out. Darn folks on here buying them all!


Sent from my iPhone using Tapatalk

 

[Brian B.]

I would like to hear more about a 58cc swap, not that I would do it.. Just an interesting read.

(Heck my 45's run real good with just the muff mod... The newer one seems to have a clutch that likes to slip though.. Haven't had time to really look into it yet)

 

[DexterDay]

I will report back once I get the 58cc in. I will say that the eBay seller that sells them is more than a pleasure to deal with. She (Lisa) sent a personal email with proper instructions on how to do the swap and followed up after she shipped it. Should be here beginning of this week.

 

[jteam]

Stephen, where did you get that one from for $70? Any link or seller info ? Thanks


Sent from my iPhone using Tapatalk

 

[jteam]

Well I had some time to mess with my 3814 today. Finished my muffler mod and decided to do some porting on the cylinder. Here's some pics of how my muffler turned out.

Sent from my iPhone using Tapatalk

 

[jteam]

Here's the back of it after my hack welding job and some JB Weld for the pin holes.

Sent from my iPhone using Tapatalk

 

[jteam]

This forum is full of experienced and knowledgable people and I must admit that that knowledge and advice is only as good as someone's willingness to listen to it. Rather than port my cylinder with a hand file as recommended, I went at it with a rotary tool, some sanding drums and no clue what I was doing. I ended up lowering the intake port unintentionally and was
Much more careful on the exhaust. Now I am appealing to you guys for advice. I'll post a pic below showing how I lowered the port. 1. I am curious if it appears that it will be an issue? 2. Should I install the cylinder WITH a gasket since I screwed the pooch on the intake or would eliminating the gasket be worth trying still?

Thanks in advance.

Sent from my iPhone using Tapatalk

 

[DexterDay]

Got my 58cc engine in 2 days ago.
Haven't had time to swap the tanks. But the seller was extremely nice and even sent a personal email with install instructions. Which wasn't necessary, but nice to see some people go the extra mile. Also, the seller being a woman was impressive as well

 

[Chris-PA]

This forum is full of experienced and knowledgable people and I must admit that that knowledge and advice is only as good as someone's willingness to listen to it. Rather than port my cylinder with a hand file as recommended, I went at it with a rotary tool, some sanding drums and no clue what I was doing. I ended up lowering the intake port unintentionally and was
Much more careful on the exhaust. Now I am appealing to you guys for advice. I'll post a pic below showing how I lowered the port. 1. I am curious if it appears that it will be an issue? 2. Should I install the cylinder WITH a gasket since I screwed the pooch on the intake or would eliminating the gasket be worth trying still?

Thanks in advance.

Sent from my iPhone using Tapatalk

About how much did you lower it?

 

[jteam]

About how much did you lower it?

You can see in the pic that the center portion is untouched but the two sides got lowered to match the dimension of the sanding drum I was using. The left side (looking in) is the lowest and from the best I can tell by marking it on paper and measuring with my caliper, it appears to be .5 mm lower. This may not be much, but I was concerned so I did not assemble it yet. This is my first attempt so I thought I would check with the "brain trust" here first. I did open the sides of both ports up to eliminate some of the taper they had.

 

[diggers_dad]

You can see in the pic that the center portion is untouched but the two sides got lowered to match the dimension of the sanding drum I was using. The left side (looking in) is the lowest and from the best I can tell by marking it on paper and measuring with my caliper, it appears to be .5 mm lower. This may not be much, but I was concerned so I did not assemble it yet. This is my first attempt so I thought I would check with the "brain trust" here first. I did open the sides of both ports up to eliminate some of the taper they had.
View attachment 331135

I don't see any worries there.

 

[diggers_dad]

Got my 58cc engine in 2 days ago.
Haven't had time to swap the tanks. But the seller was extremely nice and even sent a personal email with install instructions. Which wasn't necessary, but nice to see some people go the extra mile. Also, the seller being a woman was impressive as well

I bought an aftermarket chainbrake from her but it wasn't the one pictured. I shot her a message and she responded quickly and offered to take care of whatever needed to make it right. Super nice to deal with and fairly knowledgeable on the Chinese saws from my experience. I'd buy from her again.

 

[diggers_dad]

You can see in the pic that the center portion is untouched but the two sides got lowered to match the dimension of the sanding drum I was using. The left side (looking in) is the lowest and from the best I can tell by marking it on paper and measuring with my caliper, it appears to be .5 mm lower. This may not be much, but I was concerned so I did not assemble it yet. This is my first attempt so I thought I would check with the "brain trust" here first. I did open the sides of both ports up to eliminate some of the taper they had.

Also - you MUST, MUST, M-U-S-T put a slight taper on the inside edge of the exhaust after port work. Nothing extreme. Careful attention with some 250 grit sandpaper wet with oil will do a fair job. Just enough of a taper to prevent the rings from catching.

Then, clean out that cylinder thoroughly. If you leave even a few tiny particles you have signed the death warrant of the cylinder.

dd

 

[jteam]

Also - you MUST, MUST, M-U-S-T put a slight taper on the inside edge of the exhaust after port work. Nothing extreme. Careful attention with some 250 grit sandpaper wet with oil will do a fair job. Just enough of a taper to prevent the rings from catching.

Then, clean out that cylinder thoroughly. If you leave even a few tiny particles you have signed the death warrant of the cylinder.

dd

DD, thanks for that reminder


Sent from my iPhone using Tapatalk

 

[jteam]

Got my 58cc engine in 2 days ago.
Haven't had time to swap the tanks. But the seller was extremely nice and even sent a personal email with install instructions. Which wasn't necessary, but nice to see some people go the extra mile. Also, the seller being a woman was impressive as well

View attachment 331081 View attachment 331082

Dex, are you going to be using the 45cc "furniture" on that 58?


Sent from my iPhone using Tapatalk

 

[Chris-PA]

You can see in the pic that the center portion is untouched but the two sides got lowered to match the dimension of the sanding drum I was using. The left side (looking in) is the lowest and from the best I can tell by marking it on paper and measuring with my caliper, it appears to be .5 mm lower. This may not be much, but I was concerned so I did not assemble it yet. This is my first attempt so I thought I would check with the "brain trust" here first. I did open the sides of both ports up to eliminate some of the taper they had.
View attachment 331135

Yeah, that is not a problem at all, just even it out an smooth the inside edge. The rings do not pass over the lower intake port, but the edge of the piston skirt does. I'm quite sure I lowered mine further (hard to compare at different angles):

 

[Chris-PA]

It's funny - I find myself looking for excuses to run the little 38cc Earthquake. I just like it, maybe more so because it's supposed to be junk but is not.