dissecting an earthquake chainsaw

[leecopland]

At the Home Depot Canada we have the ryobi ry3714 this year 37cc as well as the older 46cc unit. Echos of course too.

 

[Chris-PA]

Interesting.
This is the new Ryobi we get here:

It's marketed as a 51cc with something called "Full Crank PoWR XT" which is... I have no idea. The Ryobi website doesn't help me and as the saw is so new I haven't seen any yet, let alone dissected one.
Anyone knows what is it could be based upon? I am leaning towards one of the latest Zenoah-based Chinese saws but I honestly have no clue.

That looks just like the 46cc Homeli/Ryobi/Techtronic saws sold here, maybe just bored out a bit. They are not Zenoah. I've never had one, but I believe they are clamshells with cat mufflers, might have quad open transfers.

 

[TBS]

@nenicu do you come across any Zomax saws in your area?

Zomax is making there own saws that are stratocharged and other designs.

 

[Conquistador3]

That looks just like the 46cc Homeli/Ryobi/Techtronic saws sold here, maybe just bored out a bit. They are not Zenoah. I've never had one, but I believe they are clamshells with cat mufflers, might have quad open transfers.

Thanks. So no rebranded Echo's for us.

 

[nenicu]

It's not strato, is krankcase intake with reed valve just like some small italian McCullochs[33 cc ?].

 

[nenicu]

The fuel /air mix enters in the crankcase when the piston is on the way up. On the way down the reed closes and the mix goes up the transfer tunnel. This set up is on some chinese mini bikes an two stroke atv.Same system on two stroke gennies.[ crankcase intake].

 

[nenicu]

Funny thing the crankcase seems like a modified Zenoah G 450.

 

[TBS]

Here's what the saw looks like.

They have stratocharged saws to that got epa and carb approval they were also at a few u.s. equipment shows so they are testing the waters here.

 

[nenicu]

Zomax ZM 5600. Looks like a modified Zenoah. They have a Husqvarna 570 clone[strato].

 

[nenicu]

Look for McCulloch PM 374 euromac. Crankcase intake with reeds.

 

[Conquistador3]

The Zomax I've seen here in Europe were painted Husqvarna orange. Pretty expensive by all standards: the 5410 is well over €200 and the chain brake handle feels like will snap at first opportunity.
Honestly I think they are no improvement over the usual Zenoah "derivatives".

 

[Chris-PA]

It does look like it's based on the Zenoah chassis. I've often wondered if a reed valve design would make more sense in regard to meeting emissions standards. The non-strato saws that meet emissions rules often have a very short exhaust duration and restrictive muffler, so they don't rev anyway. It seems like a reed valve design would have beeter intake control and more power at lower rpm. But no one is doing that.

 

[Ozhoo]

I noticed that they're back on eBay if anyone has a hankering to pay 250 quid for a 50 quid saw.
http://www.ebay.com/itm/Earthquake-45cc-2-Cycle-18in-Gas-Chainsaw-Medium-duty-Firewood-Tree-Cutting-Trim-/262831357934

 

[TBS]

Was over on O…..P……E forum reading about the changes poulan is getting. Redmax is getting snuck into the mcculloch brand internationally with their cs35.

IPL, MCCULLOCH, CS35, 967624614, ...

 

[Chris-PA]

Was over on O…..P……E forum reading about the changes poulan is getting. Redmax is getting snuck into the mcculloch brand internationally with their cs35.

IPL, MCCULLOCH, CS35, 967624614, ...

It's Zenoah in a round about way - that's the Jenn Feng McCulloch XM40 design, with a GZ4000 type cylinder stuck on a G3200-based chassis, but with the strato ports blocked off. Those have been sold as McCulloch for some time really.

Still, I guess now that Husqvarna owns both Jenn Feng and Zenoah it's distinction without much difference.

 

[linksys]

after few problem with a crank playing left to right i decided to porting cylinder
stok
1.5 mm Squish
i 73
e 107
t 132

no base gasket
Squish 1mm
i 79
e 106
t 125
runs little better than partner 371

 

[nenicu]

My Earthquake chainsaw

 

[nenicu]

The crankshaft looks like crap. Even one Taiwan made for the strato clones[ Jenn Feng] put next to it looks first class. The flywheel side is 12 mm and clutch side 15 mm. Looks made from left Redmax g3800 part and right Redmax g5000 part. Weird combo. The bearings also left g3800 and right g5000.

 

[TBS]

543xp crank?

 

[nenicu]

Yes. The counter weights are crap from casting[ forging].