AM Piston Kit Review

[Cantdog]

There's the double-edged sword right there. The companies willing to take on aftermarket replacement parts for older or less popular models can't afford to put the quality into those parts, and people here need to remember that instead of just whining about it. There's a reason Meteor doesn't make a replacement piston for some models and VEC or Golf do, like the Jonsered 920. Most people aren't going to take the time to rebuild a blown up 920, plain and simple.

Yes I understand the numbers and production thing and am frankly amazed that any mfgr would bother to undertake building a piston for any chain saws that have been out of production for 20-25 yrs. In the case I refer to with the 49SP piston I believe they did a great job on the fit and finish and the overall replication and the only problem I found was with the aforementioned excessive slop in the conrod to wristpin bosses. Fortunately I had the equally old and obscure parts to remedy the problem to my liking. If you are going to all the effort to accurately replicate a high compression, domed piston....then addressing this problem at the casting level should not be that much of a stretch as long as you know or are informed the issue exists. It isn't like adding another machining step the the process or anything....shouldn't take any more effort/expense to do it correctly once all the hard stuff is done. And you are also right... MOST people don't take the time/expense to rebuild ANY chainsaw....OEM has seen to that..doesn't matter what saw brand...when a new top end costs half the price of a new saw then add in the labor...what's the point...buy a whole new saw which is what the saw makers want.

 

[Adirondackstihl]

How about the P/C clearance

0.002" @ the skirts
0.006" below the bottom ring land

 

[jonsereds 621]

Replacement 49sp piston.

Hello all. I have a 49sp replacement piston on the way to me in the uk. I note with interest the issue regarding con rod to wrist pin boss clearance being a tad excessive. In three months of looking i have not found any other alternative. It would seem to me that some form of shims may be neccesary (i don't have it yet). If so, does anyone have a suggestion as to what materiel might be most suitable for this task ? I have a lathe, and can work to satisfactory tolerances for this job. I was considering, if it proves to be necessary, cutting wrist pin mount from old piston and forming two shims from this. Obviously, should this become detached, i will be looking at a 'catastrophe magnifique'. I do not have access to a large pile of other saws that may have suitable parts, and frankly, in the uk, getting anyone to listen to and look for what i am talking about is a non starter. It may be however, that my piston is from batch 3 or so and this will not be an issue. Any advice would be appreciated, other than buy an electric. Jim.

 

[Adirondackstihl]

So your saying the VEC piston was even worse? Answer that question and I'll tell you something else about India #2 :msp_smile:

opcorn: :beer: :sigarette: izza:

 

[tpope]

So your saying the VEC piston was even worse? Answer that question and I'll tell you something else about India #2 :msp_smile:

opcorn: :beer: :sigarette: izza:

Well this question begs an explanation... Inform us already.

 

[old-cat]

It seems the 034 is one of those no demand motors, so quality AM pistons are almost zero. Someone in Greece is selling Meteor and Episan. So I jumped for the Episan for my 034. I hope $40 brings me a good quality piston.

Concerning VEC pistons, Northwoods told me they are changing to Mako pistons soon.

 

[almondgt]

Well, at least they spell GOLF right. Thanks for a good write-up.

Check the location of the O and you will find it is very close to the L on the old keyboard..........typo/positively. Correct the typo and you arrive at GOOF pistons. Appropriate if you consider quality is not important to the manufacturer Sooooo, I recommend a name change Goof pistons will never know the difference:msp_wink: