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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › YS50ST on the 10th gallon
06-21-2009 03:29 PM  11 years ago
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Duckster

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Brunei

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YS50ST on the 10th gallon
On the 10th gallon the engine produce the rattling sound.

Am running it with MPG, the temp never exceed 120C, just to get some info before replacing any part from the engine.

I just need to know is anybody have experience this problem before, the sound of that rattling sound remind me of OS50 hyper with those rear bearing problem and Plug flame out, either mid air or after the engine stop.

the only different in my YS the plug dose not flame off. but i know the power on the full throttle is less, the response quite fair.

Could it be Bearing problems as OS engine do or other thing, the idle was not that smooth no more due to this rattle sound, am just afraid of conrod will break if the bearing start worn out and seize everything up.

Please do help

Ruhaizmi
Trex 600,700 AND 450, GY611, GY401, OS5H, OS91HZ, MGP, HS65HB, Scorpion 2221-8,
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06-21-2009 04:10 PM  11 years ago
tchavei

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Portugal

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There is only one way to be sure.. open the engine and check?

Tony

--------------------
"Perfection and patience usually walk side by side..."
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06-21-2009 04:50 PM  11 years ago
pgrbff

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Piemonte, Italy

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I've had 3 sets of bearings go on my YS50's at relatively low useage, no other damage, just main bearing shot.Proficient at turning cash and credit into smoke and noise!
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06-21-2009 09:34 PM  11 years ago
RaptorMan23

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Sioux City, IA

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Could be bearings, muffler baffle, if it sounds like a weed wacker against a chain link fence then it could be a sprague bearing also
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06-22-2009 12:20 AM  11 years ago
Duckster

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Brunei

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which one way bearing do u mean, is it the one from the clutchTrex 600,700 AND 450, GY611, GY401, OS5H, OS91HZ, MGP, HS65HB, Scorpion 2221-8,
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06-22-2009 04:05 AM  11 years ago
RaptorMan23

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Sioux City, IA

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The sprague is inside your main gear, Im kinda betting on the problem being a loose baffel in the muffler though since you said the problem changed your idle. BUT, it could also be other things also like a clutch problem, whether it would be the clutch bearings, broken bell, broken clutch. Your just gonna have to kind of try to hunt it down
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06-22-2009 05:53 PM  11 years ago
Duckster

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Brunei

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About the main gear One Way i had just change it to new bearing due to the lock main gear and problem gone, and then a new clutch install due to lack of power, the muffler i had just open the muffler and shake it to check weather loose or not but there is no sign or sound of loose baffle when i shake on the muffler, and now my concern is the rear bearing or is it because of the clutch is not align will make a rattle sound.but what i heard is lot of people doss not have problem with the rear bearing on their YS50, that really turn me down if i got a rear bearing problem, in which i have a problem on my hyper 50 rear bearing problem and change to new YS since a review of no rear bearing problem or may be this happen to me just because of no luck on ysTrex 600,700 AND 450, GY611, GY401, OS5H, OS91HZ, MGP, HS65HB, Scorpion 2221-8,
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06-22-2009 06:51 PM  11 years ago
tchavei

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Portugal

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Maybe the problem lies elsewhere... I have a Hyper with 400 flights and original bearing and I have an YS with 300 flights and the original bearing too....

Tony

--------------------
"Perfection and patience usually walk side by side..."
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06-27-2009 08:54 AM  11 years ago
Duckster

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Brunei

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Tadaaaaa found the problem .... already just service my engine last nite it has the same problem as the OS hyper do the back bearing problem
and am repalacing with the OS bearing and the problem fix....
Trex 600,700 AND 450, GY611, GY401, OS5H, OS91HZ, MGP, HS65HB, Scorpion 2221-8,
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06-27-2009 11:40 PM  11 years ago
JuanRodriguez

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The Villages, Florida

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Tadaaaaa found the problem .... already just service my engine last nite it has the same problem as the OS hyper do the back bearing problem and am repalacing with the OS bearing and the problem fix....
Ok........let me get this straight.... You replaced your bad bearing with an OS bearing which are known to be notoriously bad ????

Please let us know how that works out !!!
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06-28-2009 03:08 AM  11 years ago
rexxigpilot

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rexxig2@comcast.net

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There is nothing wrong with the bearing in the OS Hyper! I believe the same bearing is used in the YS. The bearings wear out due to vibration, high loads/inadequate lubrication if run lean and, in the case of a neglected engine, rust. After 10 gallons of hard flying, the bearing is generally in need of replacement in my experience.

Single cylinder RC engines like all single cylinder engines are known as thumpers. They have a weight on the crank to counteract the primary imbalance of the piston and con-rod motion. Unfortunately, a large secondary imbalance is generated by the crank weight which causes a side to side (rocking) motion. The peak secondary imbalance occurs approximately when the piston is midway between TDC and BDC, when the weight is 90° to the piston motion. It is this vibration that is destroying the bearings.

If you want your bearing to last longer, you must reduce the rpm's or reciprocating mass to reduce the force of the imbalance. We can't control the mass. Only the manufacturer can do this. So, if you aren't prepared to run your engine at a lower rpm (and who is?), you will have to replace the bearings periodically. Just my 2 cents.
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