troutfisher
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just use the cover off the old carb, it doesn't have a port.
3120XP Gone WILD
- Thread starter blsnelling
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just use the cover off the old carb, it doesn't have a port.
Exactly. Provided the carb body has the provisions to drill the impulse passage. All it takes is drilling at two angles. One into the flange of the carb, and the other to intersect with it from under the side of the carb. I wouldn't know until I had the carb in hand it I could do it.
They have the WG-3 for $99. I'll check out their return policy.
Edit: The do accept returns with a RMA and 15% restocking fee. I'll let TreeCo make the decision here.
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Tzed250
Addicted to ArboristSite
Understood. I had had a compromised P&C to start with. I'm pleased to see it running like it is. If I were starting with a new P&C, I would not have raised the exhaust at all. And I wouldn't have raised the transfers near as much as they have been. For that matter, I wouldn't have lowered the intake near as much either. Can you say "Butcher"
As you requested Brad...
Did a little math for you...
At 11,200 RPM the 3120 is making the same mean piston speed as a 346 at 14,500 RPM, and the 346 won't be in the wood at that figure.
I hope you see what I'm getting at. There is no way that piston will survive long under those kinds of loads. As well, TreeCo said the saw would be used for stumping. That high exhaust port will not be ideal for conditions like that.
I would explore cutting the base to get the exhaust duration back to a reasonable number and to kill some of those revs. If that is not possible then a new top end may be needed. Not your fault, killed on a workbench other than yours.
That is what I would do if it were my saw.
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Thanks Tzed.
You sure that is an Oak? Sure looks like a sugar maple to me....looks like a true beast you have there, but please quit free-revving the piss out of it. That's just not right.
You sure that is an Oak? Sure looks like a sugar maple to me....looks like a true beast you have there, but please quit free-revving the piss out of it. That's just not right.
I'm pretty sure I remember Oak leaves on it in the Spring after it was dropped. But no, I'm not positive. I've got to check the tune somehow. I won't tune off of plug color alone, and I can't tune it in the cut without and adjustable carb.
That's fine, just a pet peeve of mine seeing a saw free revving. Why don't you like plug color? Too much of a technicality? Plug color or timed cuts are about the only way to tune a saw that is rev-limited (I know this saw is not RL).
Otherwise, that saw is just mean. I hope you get it running rich because that thing is turning serious RPM in the cut. Gotta be a lot of heat like Tzed said.
Tzed250
Addicted to ArboristSite
I wouldn't worry about the heat as much as I would worry about finding the intake side skirt in the bottom end.
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If this saw had an adjustable H needle, I'd tune it in the cut with a quick rev to double check. I don't have that luxury. IMHO, plug color is way too subjective. It can be affect by fuel type, etc. If I were going by plug color alone, I would not have gone up in jet size after the last run. We're now going to order a WG-3 carb and see if it can be modified for a bolt on replacement, with no mods to the case.
Ya, but heat is the big killer IMO. That piston will expand and turning that many Rpm's isn't good. I just think it would seize before something letting loose.
My 084 turns close to the same RPMs and has had no trouble. Matter of fact it has 170-175 PSI compression with a popup piston. I've had it pulling a 9-pin 3/8 rim on a 50" bar buried in solid Oak. I don't thing you're going to generate much more heat than that.
BTW, I'm pretty sure 'Slingrs 880 is turning close to this many RPMs as well.
BTW, I'm pretty sure 'Slingrs 880 is turning close to this many RPMs as well.
B_Turner
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I may have missed some posts, but from what I"ve read you've drilled the main jet out huge and you are still turning 14k.
Something's up. Shouldn't be revving so high with the jet so large.
For a comparison, a stock husky NON epa turns a touch over 12k with a 1.16mm jet. You are dumping way more fuel in then that.
But I may be missing something here.
Something's up. Shouldn't be revving so high with the jet so large.
For a comparison, a stock husky NON epa turns a touch over 12k with a 1.16mm jet. You are dumping way more fuel in then that.
But I may be missing something here.
Tzed250
Addicted to ArboristSite
Curious then, why do you think Husqvarna keeps dropping the rev limit on the 3120?
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B_Turner
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I've been told the green coil setup was an EPA thing. Canada and US only.
ROW mostly gets the black coil and flywheel still.
It's a whole new ballgame with a ported saw. .055 on the main jet is not out of line for a ported 3120. We don't port saws for them to turn factory RPMs, lol
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Tree Sling'r
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It's a whole new ballgame with a ported saw. .055 on the main jet is not out of line for a ported 3120. We don't port saws for them to turn factory RPMs, lol
I agree, porting does amazing things. Exactly why I will go to my grave argueing the non rev coil vs the limited, same with a carb.
Saw looks good Brad.
