What's on your bench?

[Czed]

Echos gaining ground here used to be stihl and husky country.

 

[Tor R]

Collection of 550 cranks, all with blown con rod bearing.

 

[Czed]

Collection of 550 cranks, all with blown con rod bearing.

View attachment 40437[

Collection of 550 cranks, all with blown con rod bearing.

View attachment 40437

Were they from a tree service or individuals. Ive seen a crew burn their saws up with bad mix before.otherwise thats a lot of failures.

 

[PA Dan]

Collection of 550 cranks, all with blown con rod bearing.

View attachment 40437

 

[Czed]

Sorry man i hit the wrong button i walked on your quote i have fat fingers.

 

[Tor R]

4 out of 10 Dan
It's their weak spot, I'm not sure of it's the con rod bearing who is too weak or if it's the uneven crankcase halfs who doesnt line up everything 100%, or if the strato play a part also.
I have no problem with a lean scored saw but it always make me nerveous when those cranks get blown.

 

[Simondo]

4 out of 10 Dan
It's their weak spot, I'm not sure of it's the con rod bearing who is too weak or if it's the uneven crankcase halfs who doesnt line up everything 100%, or if the strato play a part also.
I have no problem with a lean scored saw but it always make me nerveous when those cranks get blown.

Tor...I Think Randy has a Very plausible theory in that the bottom end is not getting as much oil as it could need . 50.1 may not be enough with some of these saws.

 

[Mastermind]

4 out of 10 Dan
It's their weak spot, I'm not sure of it's the con rod bearing who is too weak or if it's the uneven crankcase halfs who doesnt line up everything 100%, or if the strato play a part also.
I have no problem with a lean scored saw but it always make me nerveous when those cranks get blown.

They run too lean......then recommend a 50:1 ratio.

 

[Stump Shot]

Has anyone here ever tried taking saw cranks apart before? I know it's not standard procedure, would seem someone would give it a go though. On larger two strokes it's not even a second thought to change the bearing and save the crankshaft. So is it just economic factors weighing in here?

 

[Mastermind]

I made a jig to do 066 cranks. It's time consuming to get rid of the run out.

 

[Czed]

I've done few dirt bikes and it wasn't easy seems simple but specially tools were needed.

 

[Stump Shot]

I made a jig to do 066 cranks. It's time consuming to get rid of the run out.

Never done it myself, does sound intriguing to me though, a cousin of mine "sets" the cranks in a lathe with a lead hammer.

So I guess my question of the day would be, where would a person source the bearing, if it's not supplied from the manufacturer?

 

[Tor R]

Has anyone here ever tried taking saw cranks apart before? I know it's not standard procedure, would seem someone would give it a go though. On larger two strokes it's not even a second thought to change the bearing and save the crankshaft. So is it just economic factors weighing in here?

there is a few companies who do that type work, the price tag I got wasnt bad at all in Norway.
If I first go that path I defently want better bearing then what Husky has used.

 

[Tor R]

They run too lean......then recommend a 50:1 ratio.

i think you are pretty much spot on.
Husky updated their crank I think, piston bearing at least once, and main bearing once or twice, not sure if their are done yet

 

[Stump Shot]

I made a jig to do 066 cranks. It's time consuming to get rid of the run out.

Sometime when you have an extra minute or two, could you post a picture of your jig? Kind of interested in what you have. Guess that makes two questions.

 

[rattler]

Sometime when you have an extra minute or two, could you post a picture of your jig? Kind of interested in what you have. Guess that makes two questions.

Stump if you press one apart how about some pic,s my press wouldn't press a 385 apart but I dident have a good way to hold it.

 

[mdavlee]

Maybe this had too much compression?

 

[rattler]

Maybe this had too much compression?

Mike could be just a tad.

 

[mdavlee]

Mike could be just a tad.

Going to high elevation. It was 210 with no run time.

 

[Stump Shot]

Stump if you press one apart how about some pic,s my press wouldn't press a 385 apart but I dident have a good way to hold it.

Next time my cousin comes over for coffee, I'll ask him to let me in on his voodoo crank work and do up a thread on it. I'll also ask what he holds the crank with, all I can remember being on his press are lots of different blocks of heavy steel.