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Marque Remarks => Husqvarna => Topic started by: DJPresto on January 15, 2018, 10:54:02 pm

Title: 1982 Husky 430 minimum piston ring gap?
Post by: DJPresto on January 15, 2018, 10:54:02 pm

As far as Husky manuals go it only states maximum wear limit 0.8mm but doesn't show a minimum to fine the new ring to!
 
Just wondering what the minimum ring clearance should be and measured at what point in the bore (the manual states to measure at the base)?

From my understanding the diameter of the bore in this case is (86.95mm) 3.42 x 0.004 thou = 0.013692 (0.014) so approx 0.35mm sounds about right.
Anyone concur that this is a fair end gap for a new ring?

Thank you

Title: Re: 1982 Husky 430 minimum piston ring gap?
Post by: PEZBerq on January 16, 2018, 07:06:59 am

You are correct. 4 to 5 thou inch per inch of bore is fine. Use a piston to make sure ring sits square to the bike when measuring the gap. Measure 0.5 inch down from top of bore in running area of the ring. If bore is new then can measure where Husky manuals shows. If gap is too tight the bike can nip up due to ring seizure. Has happened to my Husky 500 and was easily fixed.

Title: Re: 1982 Husky 430 minimum piston ring gap?
Post by: DJPresto on January 17, 2018, 08:14:26 pm

Quote from: PEZBerq on January 16, 2018, 07:06:59 am

You are correct. 4 to 5 thou inch per inch of bore is fine. Use a piston to make sure ring sits square to the bike when measuring the gap. Measure 0.5 inch down from top of bore in running area of the ring. If bore is new then can measure where Husky manuals shows. If gap is too tight the bike can nip up due to ring seizure. Has happened to my Husky 500 and was easily fixed.

Thanks for the input!  :)