Piston ring gap

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16 years 7 months ago #10367 by 50 stowe
Piston ring gap was created by 50 stowe
On a new zen or a new evo motor what should the ring gap be?

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  • Scott
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  • Devoted Enthusiast ... MGB Technical advisor
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16 years 7 months ago #10369 by Scott
Replied by Scott on topic RE: Piston ring gap
(Metric) ... End Gap (mm) 0.05~0.25 on G260/231 engines. RCMK should be the same.
Max Limit 0.5 (mm)

All the spec can found within the operators manual found here: rds.yahoo.com/_ylt=A0oGklmOZ2B...enownersman.pdf
2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
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16 years 7 months ago #10379 by 50 stowe
Replied by 50 stowe on topic RE: Piston ring gap
Thanks, Running a evo top with a zen piston just want to be sure. Is there any problem doing this?

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16 years 7 months ago #10380 by Scott
Replied by Scott on topic RE: Piston ring gap

50 stowe wrote: Thanks, Running a evo top with a zen piston just want to be sure. Is there any problem doing this?


No problem doing so ... a good idea tho to undercut diameter .002" above and below ring as is customary with modified Zenoahs.
2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.

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16 years 7 months ago #10382 by 50 stowe
Replied by 50 stowe on topic RE: Piston ring gap
It is a mod piston, Just trying to use up old stock before i move over to all rcmk motors. Working on a self mod evo cylinder. Do i have to widen the intake and exhaust like the zen?

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16 years 7 months ago #10447 by Scott
Replied by Scott on topic RE: Piston ring gap

50 stowe wrote: Do i have to widen the intake and exhaust like the zen?


May I suggest if wanting to explore tuning tricks for the EVO cylinders you start a specific thread on said subject ;)
2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.

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16 years 7 months ago #10450 by marc
Replied by marc on topic RE: Piston ring gap
BTW, both the Operating Manuals and the Maintenance Specs manuals are available on this site in the Resources section. There's also a troubleshooting guide. Will load a lot faster and easier than that external link. :)
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