Saw builds

[jmssaws]

what are you putting on this thing for a carb?

The one that came with it,hd34a maybe?

 

[jmssaws]

unsubscribing to this thread the *B-S.... is getting deep in here

Are you saying I made up the airleak that is a tiny hole in the casting?

 

[jmssaws]

View attachment 60657 View attachment 60658 View attachment 60659

A page back is the same pics of this cylinder that you can analyze.

 

[jmssaws]

I've seen a few crazy stuff on a new saw. Some showed up right off the bat on a new start up and some didn't.
One was a ms251 with no piston ring pins. Customer ran it for about 15 min before it caught a port.

This cylinder has a lot of time on it and is probably 15 years old and would have ran perfect for most everybody but guys like me or Scott no there's something wrong.
I was telling a guy last night that I thought it had a airleak,it was hard to find.

Looked most of the day for the problem that took 10 seconds to fix.

I got a nib never fueled saw to port a couple years ago that I knew was off and finally found the flywheel side seal didn't have a spring in it and would leak off and on.

 

[X 66 stang347 X]

Was it a little slow to come down to idle? And low side seemed a little off?

 

[jmssaws]

Was it a little slow to come down to idle? And low side seemed a little off?

No it was just like this saw, ran and tuned fine but didn't have power like it should and had a bland feel to it.
Very small airleak

 

[Armbru84]

Guys, saw is mine and I bought it as a rebuild project. It was ran at Randy's GTG and the guy said it ran great, and showed 155 compression but had some scoring. It must have been running fine to get past the group there. Thanks Jason for finding it and fixing it.

 

[jmssaws]

Guys, saw is mine and I bought it as a rebuild project. It was ran at Randy's GTG and the guy said it ran great, and showed 155 compression but had some scoring. It must have been running fine to get past the group there. Thanks Jason for finding it and fixing it.

It's without a doubt the overall poorest quality stihl cylinder I've ever seen.
I raised the exhaust a good ways and I'm still in the factory bevel.
Look at these factory ports and tell me they couldn't let one with a pinhole get by them.

 

[X 66 stang347 X]

Wow. Almost looks aftermarket

 

[RI Chevy]

How did you or will you fix it Jason? JB weld?

 

[jmssaws]

How did you or will you fix it Jason? JB weld?

It's already fixed.
I just put some jb weld on it when I fixed the exhaust port,I always grind through on the roof.

 

[RI Chevy]

OK. Thanks Jason.

 

[jmssaws]

For the crowd of people who are deeply concerned about my every move.
I did grind through this cylinder,I grind through every cylinder generally but not where it was leaking.

I'll explain,see to grind through something you have to grind until it's very thin and keep going until you Poke through so if the spot that's leaking is a 1/4" thick and hasn't been ground on at all well that means it wasn't caused by that,I guess for some reason I could have drilled a hole with a real tiny bit but I'm not sure what I would do that for.

What would be more amazingly stupid than doing that would be to talk about it with your buddys while high fiving in front of the people who you work for.

 

[X 66 stang347 X]

I had 460 on the brain

 

[jmssaws]

I had 460 on the brain

I wasn't commenting on your post,sorry if it seemed like I was.

 

[X 66 stang347 X]

No it was something I posted and deleted. It was related more to a 460 than a 361.

 

[jmssaws]

361 is back together and seems better.
I'll go run it this morning and see.

I was looking at this little 201t that's here and noticed that it's mtronic,I didn't no they made them but it must be a nice little saw.

 

[blsnelling]

Those transfers are huge

It's a hole in the casting.
Barely leaks and I'm sure nobody ever noticed it.
It ran ok and tuned and idled good but it was blah and shouldn't be and once in a while it would run away at wfo.
Failed vacuum test bad but had to air it up in a bucket of water to find it.

This cylinder has a lot of time on it and is probably 15 years old and would have ran perfect for most everybody but guys like me or Scott no there's something wrong.
I was telling a guy last night that I thought it had a airleak,it was hard to find.

Looked most of the day for the problem that took 10 seconds to fix.

...didn't have power like it should and had a bland feel to it.
Very small airleak

It was ran at Randy's GTG and the guy said it ran great, and showed 155 compression but had some scoring. It must have been running fine to get past the group there.

It's already fixed.
I just put some jb weld on it when I fixed the exhaust port,I always grind through on the roof.

I did grind through this cylinder,I grind through every cylinder generally but not where it was leaking.

That looks to me like a thin spot, ground through when the transfers were major widened. You can see where it's thin around the actual hole. I'd like to see a pic of the transfer from the inside at that point.

A hole that size would have been a huge air leak, one that wouldn't have held pressure or vacuum at all. It should have bubbled up like crazy when sprayed with something like Windex.

How high is the exhaust in order to grind through it?

 

[paragonbuilder]

That looks to me like a thin spot, ground through when the transfers were major widened. You can see where it's thin around the actual hole. I'd like to see a pic of the transfer from the inside at that point.

A hole that size would have been a huge air leak, one that wouldn't have held pressure or vacuum at all. It should have bubbled up like crazy when sprayed with something like Windex.

How high is the exhaust in order to grind through it?

I recently learned how small an airleak it takes to mess up a saw. A 346 was messing with me.

Sent from my iPhone using Tapatalk

 

[X 66 stang347 X]

The leak is right above the flange. If the leaking side looks like this side it still looks pretty thick right? Pics could look different than it appears.