High Quality Chainsaw Bars Husqvarna Toys Hockfire Saws

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EFSM

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Junk Meister

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I have worked on a few of those style (055/075 hybrid, 031) and I am still not a fan. You don't have to worry about me stealing yours! 🤣
Main issue i get is these older saws need a muffler or something you might as well do all the gaskets around the cylinder. hard to not disturb the old brittle ones, I have a "gettaroundtuit" stash of 030-031-032-041-041S-051 saws some day. but the 056 mags come first and they are easier to work on
 

Shane¹

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That is a unique tool. Are those red rings interchangeable for different bores? Did you make it yourself? Can you only cut for flat pistons or dome as well?
Great work! Are you going to do the base somehow too?
Did you make your squish cutter?
I did not make the squish cutter it is from dyno joe. The rings are interchangeable and can change what size cylinder you want to cut. It cuts the band flat I suppose you could probably adapt it to cut a dome if you had the desire to do so. I have not figured out a good way to do bases yet but since it is a 7900 with a solo crank it needs .060 out of the band and still needs a base gasket.
 

Ketchup

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I did not make the squish cutter it is from dyno joe. The rings are interchangeable and can change what size cylinder you want to cut. It cuts the band flat I suppose you could probably adapt it to cut a dome if you had the desire to do so. I have not figured out a good way to do bases yet but since it is a 7900 with a solo crank it needs .060 out of the band and still needs a base gasket.
In theory, you could make a base piece that had a cutter mounted. You can definitely modify the cutter for other chamber contours.
If you have watched TreeMonkey’s videos you may have noticed he has a very similar mandrel system but the base piece is threaded with an index. One mark on the index drops the jug 0.005” (IIRC). Very clever.
 

singinwoodwackr

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I don't think the series had bad coils even though they changed a bit along the way. I don't think they had rev limits on them.
Unported, I usually start at H 1 turn out, but tend to end up many times with a little less H than that. But never below 3/4 before I try another carburetor.
Steve has pointed out that his 242 has the same limitation. Cause: AM Meteor piston.
The cyl is a new Gilardone but I haven't checked to see if it has a stock windowed piston or a closed Meteor.
 

singinwoodwackr

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Steve has pointed out that his 242 has the same limitation. Cause: AM Meteor piston.
The cyl is a new Gilardone but I haven't checked to see if it has a stock windowed piston or a closed Meteor.
Well...a KS piston with 2811 showing on the inside skirt via scope. Hmm...
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singinwoodwackr

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I replaced the throttle assembly with a nos after noticing the thing was not quite getting to full throttle.
Got a few hundred more rpms but still not right, sigh...also tried a 3rd carb 🙄
 

Tor R

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Steve has pointed out that his 242 has the same limitation. Cause: AM Meteor piston.
The cyl is a new Gilardone but I haven't checked to see if it has a stock windowed piston or a closed Meteor.

Well...a KS piston with 2811 showing on the inside skirt via scope. Hmm...
View attachment 479297View attachment 479298View attachment 479299
If Meteor 242 piston is used it becomes a low compression turtle, with the same intake timing as the old 42 had.

On Gilardoni 241 C or was it A (I always mix between 42 special and 246) KS piston was used.

To start troubleshooting your 13.9k problem, if you don't have spare coils, you have to start with carburetor diagnostics first, stock, I can never remember having a carburetor that needed a richer mixture than H=1, almost all of them ended up a little leaner, usually down to 3/4.
One problem that I have seen very often is that the speed trottle does not reach maximum, the only fix is to bend the speed transfer so that you get full speed.

An HDA-98 usually works fine and is pretty easy to tune too, never really a problem to reach 14.5k, and never a problem to reach 15.2k on 242.
 

Tor R

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I replaced the throttle assembly with a nos after noticing the thing was not quite getting to full throttle.
Got a few hundred more rpms but still not right, sigh...also tried a 3rd carb 🙄
With your new throttle assembly, are you getting full speed?
I've seen new ones that didn't make it...
 

singinwoodwackr

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With your new throttle assembly, are you getting full speed?
I've seen new ones that didn't make it...
With the new assembly the throttle opened fully. Not that it was a big amount in the first place…It hit 14,3 briefly after playing with the 3 screws but that didn’t last. The weirdest thing is if I go in much past 1 turn it starts to die and wot is actually less. I’ve never seen a carb do that.
Next is to go back and try the other 2 carbs with the new throttle.
Pulling the carb on this saw is a royal pita.
 
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