NWP big bore cyl/piston

Meteor pistons are great! Probably the number one choice after OEM. I've had good experiences with them. I haven't used a NWP cylinder yet.


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I've got a Stihl 066 and a 660 both with the NWP big bore kit. These are not day-in, day out production saws racking up 1000 hours a year. But I put them both in several years ago and have been completely happy since then. Ran almost 2.5 gallons of gas thru the 660 today without any rest, and she just keeps asking for more.
 
Thanks guys I'll give it a try. Hey Jeff, did you notice a difference in power after you installed the bigger bore?
 
Bought them both as fixer-uppers, so never ran them stock. Put them back together with the big bore kit and a dual port muffler and am quite happy power wise. However, I am not a saw tuner or hot saw builder, just a cheap tinkerer looking to save some $. The 660 was almost new, albeit blown, when I acquired it, and doing it this way I got an awesome saw for about $400!:bailando:

Speaking of which, Bailey's has these on big sale thru May 18.
 
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That was a good deal. And thanks for the baileys info. I just ordered some porting tools Thursday,I'll get a couple big bore kits ordered today. Now all I need to do is learn all the dark secrets of porting. I've got a garage full of retired and semi retired saws to practice on. Any of you hot saw builders willing to share some recipes? Or recommend some good instructional books?
 
OEM is a much better choice. I'd run a used cylinder and a new piston before I'd run any aftermarket cylinder.

Meteor pistons are great. However, they're really no cheaper than OEM now. Stick with OEM.
 
blsnelling said:
OEM is a much better choice. I'd run a used cylinder and a new piston before I'd run any aftermarket cylinder.
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I was wondering if you might weigh in on this Brad. Care to elaborate on your above comments? Why not aftermarket? You know more about this than I ever will.
 
Thanks brad, part of my job entails cutting large trees on very steep terrain. Involving long hikes up or down said steep terrain to get to the cutting site. I'm trying to pack as much punch as I can into the smaller lighter saws like a 372 or 576. That's why that extra displacement looked so appealing. Are these aftermarket cylinders poorly constructed? And therefore more prone to crack or fail structurally? Or is it rough casting that can be smoothed down with a little elbow grease? And can you recommend any porting how-to books?
 
It's more of an issue with inconsistency and quality. Some are good, some are horrible. As a builder, I cannot guarantee results from an unknown quantity. Also, the larger bore doesn't always run better. Sometimes the larger bore comes at the expense of shrinking the transfer. Another thing is the quality of the pistons and rings. I only trust OEM and Meteor there.
 
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