Ima Doher
Ole Sparky
I finally have the parts in to rebuild this ms440.
An ebayer forgot to tell me the helicoil he installed was failed attempt.
So I'm replacing with a 52mm upgrade and a dual port muffler.
I wish I took before pics but when I started I was not thinking of posting.
The little sucker had some power the 2 days I got to use it so I'm a little excited to see this thing chop em up
I havn't had time to study up on porting but I did get some eyeball on pictures and read the posts.
I took into consideration about ring catchers and worked on the interrior edges of the ports to smooth them.
I just need to get this saw back into the game right now so as I learn about porting I can take the jug back off and do a better job.
This is a Mahle cylinder and Meteor piston with caber rings.
The roof of the exhaust and intake were straight across, basically squared or oblong if you will. The exhaust looking from the inside was about straight up and down on the right and beveled outward on the left. I noticed on an 036 that the stock cylinder did the same so I imagine this is normal from factory.
*I got started working and then when I was getting done I realized maybe I was supposed to make the intake bottom of the hole more oval and not the top. I'll look through the porting posts tonight to see if I got it right or wrong. Maybe some feedback will come in to save me some time.
I'd like to get done and reassembled tomorrow if I can.
The exhaust I know is correct to make the top oval on the inside and leave the bottom line flat.
One side of the exhaust port on the inside was beveled outward into the cylinder so like the pictures I looked at I made the other side beveled outward to try and match.
It was not so noticeable that my lines are not perfect until I saw my photos. I didn't expect to do an outstanding job on the first try anyway. I spent about 5 hours on it so far.
So basically I opened it up a tiny bit and smoothed and polished.
In the top there was a defect that was two lines that were deep, in the photo you can see a couple little black marks at the bottom of the photo which is where I dremel-ed and sanded on the defect.
*I was afraid this area would make a hotspot like Ive seen in auto block videos so I did my best to get this smoothed out. I'm sure the right thing to do is to have it machined to a flat surface but for now I think this will do, correct me if I'm wrong please.
*On the top exterior jug I cut some fins off to make room for a decompression port.
I decided I might should see if one is needed before I install one, so if I have to take the cylinder back out to install it if it is rough on the shoulder when trying to start it then I'll just have to install it.
I think I read that anything much over 70cc needs the decompression port, but not certain.
Only time I got hurt was on a 100cc engine once when it snatched back hurt like double hockey sticks.
In the one photo there are three jugs, left to right is an 036 then the oem 50mm and on left is the mahle upgrade.
I read that the upgrade will bring it up to 76cc but I read another post that said it will kick it up to about 83cc.
Probably the upgrade with a expert port job would deliver that kind of results..the 83cc results that is.
So here are my photos and questions.
*Should the intake be oval on top or bottom?
*Will a smoothed out top with a minor impression to the flat surface be ok? or is it asking for a problems out the gate?
*Should I go ahead and install the decompression port or does it not not require one at the cc's I'm talking about?
*I picked up a 9mm tap and a 11/32 drill bit for the decompression port hole will the 11/32 work ok for the 9mm? it is slightly undersized but my other option was slightly oversized at the store.
sizes are 23/64 .3594 - .3543 - 11/32 .3438 All I could find was fractional drill bits and not decimal at the hardware store.
/url]
Inside
Exhaust
[/url
Intake
An ebayer forgot to tell me the helicoil he installed was failed attempt.
So I'm replacing with a 52mm upgrade and a dual port muffler.
I wish I took before pics but when I started I was not thinking of posting.
The little sucker had some power the 2 days I got to use it so I'm a little excited to see this thing chop em up
I havn't had time to study up on porting but I did get some eyeball on pictures and read the posts.
I took into consideration about ring catchers and worked on the interrior edges of the ports to smooth them.
I just need to get this saw back into the game right now so as I learn about porting I can take the jug back off and do a better job.
This is a Mahle cylinder and Meteor piston with caber rings.
The roof of the exhaust and intake were straight across, basically squared or oblong if you will. The exhaust looking from the inside was about straight up and down on the right and beveled outward on the left. I noticed on an 036 that the stock cylinder did the same so I imagine this is normal from factory.
*I got started working and then when I was getting done I realized maybe I was supposed to make the intake bottom of the hole more oval and not the top. I'll look through the porting posts tonight to see if I got it right or wrong. Maybe some feedback will come in to save me some time.
I'd like to get done and reassembled tomorrow if I can.
The exhaust I know is correct to make the top oval on the inside and leave the bottom line flat.
One side of the exhaust port on the inside was beveled outward into the cylinder so like the pictures I looked at I made the other side beveled outward to try and match.
It was not so noticeable that my lines are not perfect until I saw my photos. I didn't expect to do an outstanding job on the first try anyway. I spent about 5 hours on it so far.
So basically I opened it up a tiny bit and smoothed and polished.
In the top there was a defect that was two lines that were deep, in the photo you can see a couple little black marks at the bottom of the photo which is where I dremel-ed and sanded on the defect.
*I was afraid this area would make a hotspot like Ive seen in auto block videos so I did my best to get this smoothed out. I'm sure the right thing to do is to have it machined to a flat surface but for now I think this will do, correct me if I'm wrong please.
*On the top exterior jug I cut some fins off to make room for a decompression port.
I decided I might should see if one is needed before I install one, so if I have to take the cylinder back out to install it if it is rough on the shoulder when trying to start it then I'll just have to install it.
I think I read that anything much over 70cc needs the decompression port, but not certain.
Only time I got hurt was on a 100cc engine once when it snatched back hurt like double hockey sticks.
In the one photo there are three jugs, left to right is an 036 then the oem 50mm and on left is the mahle upgrade.
I read that the upgrade will bring it up to 76cc but I read another post that said it will kick it up to about 83cc.
Probably the upgrade with a expert port job would deliver that kind of results..the 83cc results that is.
So here are my photos and questions.
*Should the intake be oval on top or bottom?
*Will a smoothed out top with a minor impression to the flat surface be ok? or is it asking for a problems out the gate?
*Should I go ahead and install the decompression port or does it not not require one at the cc's I'm talking about?
*I picked up a 9mm tap and a 11/32 drill bit for the decompression port hole will the 11/32 work ok for the 9mm? it is slightly undersized but my other option was slightly oversized at the store.
sizes are 23/64 .3594 - .3543 - 11/32 .3438 All I could find was fractional drill bits and not decimal at the hardware store.
/url]
Inside
Exhaust
[/url
Intake
