Stihl ms290/390 pop-up piston kit - To be sold soon??

[Dub11]

I know a guy that loves working on these saws. Makes some pretty good runners out of them too.

Everybody and their brother owns a 290 around here (don't ask me why). I can see the market for these pistons being huge. Tell a fella you can rebuild his saw cheap and boost performance, he'll jump on it.

Its the name Farm Boss = Chuck Norris = Stand the fk back son ! Marketing genius right there.

 

[beaglebriar]

Its the name Farm Boss = Chuck Norris = Stand the fk back son ! Marketing genius right there.

Lol

 

[Dub11]

It worked onnme until I found you guys Iam just glad I bought mine 290 used and the two other 390s in a box

 

[RI Chevy]

The 029/290 series is probably one of the best selling Stihl's, hands down.

 

[94BULLITT]

The 029/290 series is probably one of the best selling Stihl's, hands down.

It was the best selling saw.

 

[drf256]

Great idea and thread.

Unless you can hollow out the pop up from beneath, I think the dome you weld on adds so much weight it cancels out any benefits.

Casting one with a uniform thickness obviously eliminates that.

I have a ton of 4047 aluminum tig filler rod here if anyone needs. Supposed to be the closest alloy to piston aluminum. I have enough to weld pop ups for 6 lifetimes.

 

[Fruecrue]

I'm waiting patiently, credit card in hand.
I see this chassis more than any other. In fact I have a running 390 and a spare crank, base pan and OEM jug that had some transfer cleaned and met Mr. Dremel. I've been debating whether to do a swap on my running saw using the factory piston in it or wait for this option to become available.time to start bird dogging more 1127 bones.

 

[Black Dog Chainsaw]

Great idea and thread.

Unless you can hollow out the pop up from beneath, I think the dome you weld on adds so much weight it cancels out any benefits.

Casting one with a uniform thickness obviously eliminates that.

I have a ton of 4047 aluminum tig filler rod here if anyone needs. Supposed to be the closest alloy to piston aluminum. I have enough to weld pop ups for 6 lifetimes.

0.030-0.040 thick the size of a nickel around. Yea I can find some meat to remove to be equal on weight to a OEM. I'll look at that once I have a few chassis's here to work with...

My theory is more compression = more torque. Stihl had a pretty big stock pop-up on the 028 series which is where this idea started.

If the results are good this piston will be production copied as a performance enhancer for the 290-390 series. So the pop up will be cast with the piston and eliminate some others concerns above...

As to the concerns of others about "why bother with a clam shell?" Umm, there are millions of these out there so the parts for this series saw outsells the rest by far! Let's face it, it's not like I'm maching up a pop-up for a Poulan WT or a blue max or whatever cheap Chinese saw is "hot" right now...[emoji849]

 

[Black Dog Chainsaw]

I'm waiting patiently, credit card in hand.
I see this chassis more than any other. In fact I have a running 390 and a spare crank, base pan and OEM jug that had some transfer cleaned and met Mr. Dremel. I've been debating whether to do a swap on my running saw using the factory piston in it or wait for this option to become available.time to start bird dogging more 1127 bones.

I don't know what the production time line looks like but I'm hoping this will get to Gentleman's hands so he has time enough to get the first production run on the shelf for spring time...

 

[RipRap]

I've got three 290's that need a piston, cylinder and crank seals. OEM is too expensive, so should I buy Hyway or Cross from the HL Supply folks?

 

[94BULLITT]

I've got three 290's that need a piston, cylinder and crank seals. OEM is too expensive, so should I buy Hyway or Cross from the HL Supply folks?

I've heard the hyway cylinder is not a good performer for these saws.

Sent from my SPH-L710 using Tapatalk

 

[Dub11]

I've got three 290's that need a piston, cylinder and crank seals. OEM is too expensive, so should I buy Hyway or Cross from the HL Supply folks?

I would get the Cross they come with Caber rings.

 

[Al Smith]

My theory is more compression = more torque. Stihl had a pretty big stock pop-up on the 028 series which is where this idea started.

I'm not certain on the 028.I have one but never looked .I do know the 038 AV had a domed piston with an off set chamber .

Now I'm sure about the idea is to raise the comp as much as change the flow over the top of the piston on transfer .The ones I turned a dome on it did for the later reason .I didn't subscibe to the raised dome theory by copying somebody else who modified saw engines .It goes way back to the 60's with Jahns hi comp racing pistons for Fords and Chevys .

Stop and think about it on a removable cylinder .If you left the metal on the piston and stayed with a flat top it would occupy for space there for raising the compression as opposed to cutting a dome .Of course in the application of the topic in hand on a clam shell it would raise it some .

 

[Black Dog Chainsaw]

Package received!

I'm more of a Real Tree camo guy but I guess Mossy Joke is ok.

 

[Fruecrue]

Bump

Any updates? Is it alive?

 

[Terry Syd]

Any news yet?

 

[Terry Syd]

My 029 'sleeper' with the NK bar is running really nice, but I'd sure like to try it with another 30 psi of compression. Any news on this domed piston?

 

[Gentleman]

Any news on this domed piston?

@Black Dog Chainsaw

 

[David Young]

Package received!

I'm more of a Real Tree camo guy but I guess Mossy Joke is ok.

WOW! you are lucky!














the camera didn't break

 

[drf256]

Here's one I did. It was a huztl and the popup can be much smaller obviously.

4047 alloy.