Hisun HS700 - Piston rings

[amit]

Hi, 

My Hisun HS700 2016 (Injected) Burnes oil (Large mount of Smoke).

Are Yamaha Rhino 700 piston rings fits to Hisuns and also better ?  Which piston rings are the best ?

Thanks, 

[cliffyk]

1 hour ago, amit said:

Hi, 

My Hisun HS700 2016 (Injected) Burnes oil (Large mount of Smoke).

Are Yamaha Rhino 700 piston rings fits to Hisuns and also better ?  Which piston rings are the best ?

Thanks, 

Why would they be better--just because they have a Yamaha label? They are in all liklihood made by the same Asian manufacturer--so it's "sic of one and a half-dozen of the other".

Are you sure it's the rings? Could be the head gasket or valve guides--have you done both dry and wet compression tests?

[amit]

Tnx Cliffyk,

Actually i'm just before full inspection procedure and my first suspected area was piston rings.

i would like to repair the failure with the best quality parts in order not to open the engine again soon.

[cliffyk]

There are only a handful of manufacturers that actually make the parts for these things.

My "Coleman" Outfitter 400 is a re-branded Hisun HS400 , actually made by the  Vietnam New Century Industrial Company Limited;

I have mixed emotions about that a I spent 13 months in Vietnam in 1967--it sucked...

[Steveapc]

Cliffyk, did you do an upper end repair on your HS400 due to smoke?  I have an intermittent smoking problem with mine. Sometimes it’s good and other times it’s terrible.  I suspect the oil ring is sticking as compression appears good wet & dry.

[aefron88]

Steve,

I dont believe cliffy is around posting much anymore as I believe he sold his SxS due to health issues.

Does your HS400 smoke under specific conditions? heavy load, startup, etc? or just totally random?

If its sometimes on startup you may have a dripping fuel injector. If its more random I would lean towards the sticking ring theory.

If you think it might be a sticking ring due to sludge/carbon I have had good luck on an older automotive engine using a product called Kreen. Its made by the makers of Kroil, and you can only order it off their website. Anyway the trick is to put about an ounce down the spark plug hole and let it sit for a day or so. It will slowly drip past the rings and clean out carbon & sludge as it goes. Once the day is up crank the motor over with the plug out to get any remaining liquid out, and then reinstall and start it up. You want to do an oil change afterwards as it is a pretty strong commercial solvent. Might be worth trying before doing a whole top end teardown anyway.