Stihl 028 42mm ring set needed

[Finnbear]

I am in need of a set of rings for an old 028WB. It has the smaller 42mm piston/cylinder. I have an IPL but it only shows the later model 44mm part number. I think the 024 and 025 use a 42mm cylinder bore - can I use the ring set from one of those? :help:
Finnbear

 

[Scooterbum]

You'll need to measure your ring thickness.024 uses a 1.5mm ring.
Not sure if 028 is 1.2 or 1.5mm.

 

[Finnbear]

They measure 1.5mm. Do you know a Stihl part number or possibly a better source?
Finnbear

 

[Jacob J.]

They should still be available. If you can't find them at a dealer, then you can use two of the early-style Husky 346xp rings. The early 346 used a single 42mm 1.5mm ring.

 

[Finnbear]

The dealer has the same IPL for the 028 that I do which only shows the later 44mm piston/rings/cylinder for the WB and the 46mm for the Super. Mine is an older WB which is 42mm. Hopefully they know what fits an 024 and I can use those. I don't have time to get to the "good" dealer who I know can figure it out so a part number in hand usually saves lots of headaches .
Finnbear

 

[Jacob J.]

024 rings aren't going to help you. Only the very earliest 024s used 1.5mm rings and there's even fewer of those than there are 42mm 028s.

 

[Jacob J.]

The part number for your 42mm x 1.5mm 028 rings is 1118 034 3000.

 

[Lakeside53]

024 rings aren't going to help you. Only the very earliest 024s used 1.5mm rings and there's even fewer of those than there are 42mm 028s.

And even rarer, the first 024's used a single 1.5mm ring! Now and then one comes in for service..

 

[Jacob J.]

And even rarer, the first 024's used a single 1.5mm ring! Now and then one comes in for service..

That's right! I even remember seeing one of those single-ring pistons on the shelf. It was a full-circle piston, like a Jonsered or Husky piston.

 

[Finnbear]

I found this in an 024 IPL.
1121 034 3005 2 Piston ring Ø 42x1.5 mm

Would this be the same set as 1118 034 3000 (42mm x 1.5mm 028 rings)

 

[Jacob J.]

It depends on how the 028 rings are pinned, or if they're even pinned at all. Like I said though, those 024 rings are extremely rare and were NLA as of 1985.

 

[Finnbear]

The 028 rings are pinned with a 2mm pin that is offset from the groove so that .5mm of the pin dia. is in the groove.
Finnbear

 

[Jacob J.]

Ok, if you can't find OEM for the 028 (there has to be some dealer somewhere that has old stock on the shelf) then you might try a set of the aftermarket rings from Bailey's (one of our sponsors)- http://www.baileysonline.com/itemdetail.asp?item=PRS+4215&catID=381

 

[Finnbear]

I got this reply from Stihl yesterday.

Hello Mark.
Thanks for your E-mail and your interest in STIHL products.
Please know that part number 1118-034-3000 supersedes to 1121-034-3005.
These rings will work in your 028 if you have a 42mm piston.
I hope this helps and if I can be of any further assistance, please let
me know.
Sincerely,
Mark O'Briant
STIHL Technical Advisor