Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Husqvarna => Topic started by: joe_indi on June 11, 2018, 09:12:47 am

Title: 372XP 2 ring piston?
Post by: joe_indi on June 11, 2018, 09:12:47 am

Is there a piston with 2 rings that can be fitted on a 372XP which has a single ring piston?
Or can a 2 ring piston be used?
The reason why I ask is I have received a sample 2 ring piston that is intended for the Husky 372.
There seem to be some differences, but will it matter. See the images.
In one image I have used a single pin so that both are held at the same working height.

Title: Re: 372XP 2 ring piston?
Post by: Cut4fun . on June 11, 2018, 09:52:05 am

Our later 372 came with 2 rings in OE and also early 372 and 371 had 1 ring.  Use either or.

Title: Re: 372XP 2 ring piston?
Post by: 660magnum on June 11, 2018, 10:00:08 am

The rings form the two ring piston are thinner than the ring for the single ring piston.

Title: Re: 372XP 2 ring piston?
Post by: joe_indi on June 11, 2018, 01:16:57 pm

What bothered me was whether that little difference (marked) would affect port timing

Title: Re: 372XP 2 ring piston?
Post by: trappermike on January 04, 2019, 12:19:21 pm

I would definitely recommend the piston with the 2 thin rings.

Title: Re: 372XP 2 ring piston?
Post by: farmboy on January 04, 2019, 10:01:44 pm

Single ring piston ring is 1.5mm thick.  2 ring piston ring is 1.2mm.  There are those that run single ring on 2 ring piston.  Or, new ring top groove old ring on bottom groove.
Shep

Title: Re: 372XP 2 ring piston?
Post by: wild262 on January 05, 2019, 07:16:22 am

     I run both in my 372's and don't see much difference in either, although some would argue.   Stick with OEM if you can. 

Title: Re: 372XP 2 ring piston?
Post by: Cut4fun . on January 05, 2019, 08:11:13 am

I'm running oem 2 371 single ring pistons right now. Also going to buy 371 meteor single ring pistons for 2 more builds.

I run either too. Dont see any difference myself.

Title: Re: 372XP 2 ring piston?
Post by: trappermike on January 05, 2019, 09:48:58 am

I've tried 1 ring pistons,2 ring,and 2 ring piston with 1 ring for racing,not seen much difference,however I do prefer the 2 thin ring piston and would prefer it for racing or stock or modified. I did find in a 1 ring piston hotsaw it suffered from some blowback out of the carb,I attributed this from high cylinder pressure blowing past the ring,so I really like the 2 thin rings,I think it was a smart move by saw makers.