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I'm going through the same problem at the moment with Hepolite pistons for the Triton rebuild. Namely the oil control ring. It fits perfectly in the bore and the gap is correct. However, once the spiral 'spring' if fitted into the Grove at the back of the ring it is impossible to compress the ring in the bore. It's not the piston but the spiral spring. The technical department at Hepolite (or should that be Wassel as that is who own Hepolite these days?) don't even respond to calls or mails! Luckily the supplier who I bought the kit from is sourcing me some other German made rings as a replacement at their cost as they've had the problem before with Hepolite rings. Hepolite are now only a brand name, the pistons are made by JCC in Asia for them. Its very disappointing that Hepolite know there is an issue and do nothing to resolve it and instead are more interested in profits whilst leaving their customers to solve the problems without technical support or advice.
Quote from: Laverda Dave on August 06, 2020, 11:30:04 PMHas anyone put a caliper across the ring land diameter to see if there's any machining discrepancy there that could cause the problem? The rings don't generally sit hard up against the internal diameter once installed, so essentially floating on the piston and centralized by the bore.On mine it was definitely the ring not the piston land ... when I inserted the ring into the bore there as a slight overlap.
Has anyone put a caliper across the ring land diameter to see if there's any machining discrepancy there that could cause the problem? The rings don't generally sit hard up against the internal diameter once installed, so essentially floating on the piston and centralized by the bore.