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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › os 105 piston pin issues
11-27-2015 06:27 AM  34 months agoPost 1
cabeng

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South africa

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OK, im now on piston nr 5 , the pin holding the ring in place wears away pretty quickly , ring ends up turning, motor looses power ,
any one else have this issue ?

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11-27-2015 07:19 AM  34 months agoPost 2
Rodney Kirstine

rrApprentice

Caldwell, ID - USA

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Yep. Quite a few of us have had this happen multiple times.

Rodney
Team Synergy Field Rep, Rail Blades

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11-27-2015 05:11 PM  34 months agoPost 3
S.Dykes

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Wesley Chapel, FL - USA

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Yes, happened twice to me. I switched to ys because of this issue.

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11-30-2015 01:21 PM  34 months agoPost 4
cabeng

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South africa

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Thanks
Ive mailed OS but no reply , anyone else mailed them ? , Ive now done a modification and fitted a solid pin , will see how that goes , but its costing me a fortune in parts

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11-30-2015 01:32 PM  34 months agoPost 5
S.Dykes

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Wesley Chapel, FL - USA

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Good luck! OS will most likely tell you they have not seen this issue before, if they tell you any thing at all. The solid pin will work just fine.

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11-30-2015 05:18 PM  34 months agoPost 6
Steve Graham

rrApprentice

Denver, CO

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The state of the nitro engine trade these days is pretty sad. Small and shrinking market. Only two real players OS and YS. Neither seems to really spend many resources supporting end users. Things were probably better for consumers years ago when there was more competition.

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11-30-2015 11:26 PM  34 months agoPost 7
3dgimble

rrKey Veteran

Rochester

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Welcome to my world, I started a thread on this same issue a year ago. I lost 4 pistons cause of the ring set pin wearing put or ejecting, causing the ring to rotate.

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11-30-2015 11:42 PM  34 months agoPost 8
don s

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Chesapeake, VA

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I must be lucky. When I got my motor used, half the pin was missing. I replaced the cylinder and the pin has held up fine for the past two seasons, and still looked good this morning when I pulled it (due to unrelated issues).

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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12-01-2015 12:52 AM  34 months agoPost 9
Gearhead

rrMaster

Vt

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don s,, I am wondering if you run your engine a bit richer than others do

Jim
Buzz Buzz Buzz

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12-01-2015 01:53 AM  34 months agoPost 10
don s

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Chesapeake, VA

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It's true that I haven't run it lean that often.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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12-01-2015 05:46 AM  34 months agoPost 11
cabeng

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South africa

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Don S i suspect you got one of the original pistons , they were perfect no issues , its the latest versions , I believe made in china now

Running rich or lean has zero to do with it , Ive had pins wear out with in the first gallon of fuel, motor not even run in yet and very rich !

I sent hobbico a mail and well to be blunt , their reply was poor at best , Dont think they care

""Thank you for your Email.

We only handle distribution and service of O.S. products in North and South America. Please see this web page:

http://www.os-engines.co.jp/english.../dist_index.htm

to find the distributor in your area.

We hope you find this information helpful. Should you have any further questions or concerns, please do not hesitate to contact us at this email address. (Please be sure to copy all previous emails into any future
questions.
""

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12-01-2015 05:00 PM  34 months agoPost 12
don s

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Chesapeake, VA

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I'm pretty sure I got it from Japan (rcjapan) if that matters.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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12-01-2015 05:44 PM  34 months agoPost 13
S.Dykes

rrApprentice

Wesley Chapel, FL - USA

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Doesn't matter where it came from. My last 2 bad ones were also from japan (rcjapan).

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12-01-2015 06:17 PM  34 months agoPost 14
3dgimble

rrKey Veteran

Rochester

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I found it did not matter which two fuel I used, or how much on the rich side I ran the motors, as I had them go bad on both a 91HZR and 105HZR.

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12-01-2015 07:50 PM  34 months agoPost 15
don s

rrElite Veteran

Chesapeake, VA

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I must be lucky.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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12-02-2015 05:35 AM  34 months agoPost 16
cabeng

rrApprentice

South africa

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yip , Must be lucky don , its driving me nuts

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12-02-2015 06:16 AM  34 months agoPost 17
3dgimble

rrKey Veteran

Rochester

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My question is , was weight the main reason in OS's design, why did they used a hollow pin?
I have YS engines as well and they use solid pins in there's, I never had an issue with YS motors pin coming loose. I have SEEN fried YS pistons that were run too lean, the pins were still present in those mangled pistons.

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12-02-2015 06:57 AM  34 months agoPost 18
cabeng

rrApprentice

South africa

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NO Idea why they went to a hollow pin , besided that maybe its easier to insert and guarantee that it will stay in place and not come loose ?

it is also totally possible that the material the pin is made from is not up to the task as opposed to being the design ?
solid pin from the top will solve all issues

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12-10-2015 02:02 PM  33 months agoPost 19
Richardmid1

rrProfessor

Leeds, England

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Happened on mine too, now my new piston with less than a gallon has started wearing away the pin!

YS or E conversion next I think!

60% of the time, it works every time!

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01-20-2016 07:52 AM  32 months agoPost 20
cabeng

rrApprentice

South africa

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ive now modded mine with a solid pin , problem gone

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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › os 105 piston pin issues
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