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

[CR888]

1700 speshal piton keep china man berry busy!

 

[Black Dog Chainsaw]

Nathan would remember the details but there was another AM cylinder that HLS has.

My memory is a bit fuzzy at this point but I think we tried 3-4 cylinders... I want to say it will fit a Cross top end and OEM for sure. Seems like it might fit Hyway too but I'm not 100%. I think we also had a the cheapo non-brand Chinese cylinder maybe... I need to go check my notes. I thought I posted what it fits previously.

 

[Black Dog Chainsaw]

Dry? Unless these engines were run, compression test results are kind of meaningless.

Yes they were dry fit... I didn't have a ton of time to put 6-8 different versions together and run them all for 2-3 hours for break in... Keep in mind you have OE, hyway, china non-brand, and Cross. To compare all of them you would need to put together one stock version and one pop-up version.

10-15psi is the dry fit number which may increase or decrease depending on cylinder and what shows up in the end after rings are broken in. This was made as a modest power enhancement that would fit multiple cylinders. So if you want to see 200psi out of your farmboss you'll have to make your own custom piston.

 

[Black Dog Chainsaw]

Prototype in route. It fits hyway, cross and OEM. Dry fit numbers showing 10-15psi bump. I was looking for a little more but had to make sacrifices to get all three cylinders to fit.

Quoting previous post... You can see that all three branded jugs fit, but the Chinese AM unbranded jug did not even come close to fitting.

 

[beaglebriar]

We'll have plenty. The factory made 1700 pistons. I hope they're right.

Are these available yet?

 

[Dub11]

Are these available yet?

Your getting the 039 fever aren't ya.

 

[beaglebriar]

Your getting the 039 fever aren't ya.

Lol... asking for a friend. (Literally) [emoji1]

 

[Gentleman]

Just received the pistons.
So who wants to do a video?

 

[Dub11]

Just received the pistons.
So who wants to do a video?

Yes please

 

[Gentleman]

Yes please

Can you video some cuts with the stock piston and then some with the pop-up?

 

[Dub11]

Can you video some cuts with the stock piston and then some with the pop-up?

I could eventually

 

[Gentleman]

I could eventually

Cool

 

[Onan18]

Just received the pistons.
So who wants to do a video?

Bruce could I get a complete top end kit with the pop up piston please? I cannot do a video but will do a full build thread. Let me know how much $$$ to send.

Thanks,
Joe

 

[Fruecrue]

Can you video some cuts with the stock piston and then some with the pop-up?

I could do a comparison video. I have 3 MS390/ 039 at the moment.

 

[Fruecrue]

Yes please

Sorry, not trying to step on your toes.
Didn’t you have a saw involved in the prototype?

 

[Dub11]

Sorry, not trying to step on your toes.
Didn’t you have a saw involved in the prototype?

No toes stepped on at all. And yes with the saws. I didn't know there was others like me with more than one of these pigs lol.

 

[Fruecrue]

No toes stepped on at all. And yes with the saws. I didn't know there was others like me with more than one of these pigs lol.

They’re common in my area, I can usually buy them cheap in some state of dis-repair.

 

[Gentleman]

I could do a comparison video. I have 3 MS390/ 039 at the moment.

We'll get one out to you. Don't forget the videos.
I need a few cuts with each.

 

[Gentleman]

Bruce could I get a complete top end kit with the pop up piston please? I cannot do a video but will do a full build thread. Let me know how much $$$ to send.

Thanks,
Joe

We'll get you one too Joe. Thanks.

 

[Onan18]

We'll get you one too Joe. Thanks.

Thank You very much sir, I am looking forward to trying out this piston.