OEM vs aftermarket pistons in Robin 295

icemanls2 · 06-03-2010, 08:45 AM

Hi, I am new here but i've been lurking around for awhile and have been building carts for a long time. I thought i'd add to the information on here as there is alot of great info. I just rebuilt a robin 295 for a 99 TXT. I ordered the parts from LVS Sales Thinking i was getting OEM and got two white boxes with unlabeled aftermarket pistons,(All the rest of the parts i recieved were OEM). (I;m not bashing LVS and i should have asked beforehand)

Anyways the OEM pistons have 6 small oil holes per side in the oil ring groove, the pistons i recieved had one large 2 inch opening the full height of the ring groove on both sides of the piston for oil. I looked at em and said WTH, those seem way too big (All new parts are good if they take the time to make them right?)

So i installed the rings orientated properly and finished the build. I added 10-30 and drove it around and it had a detonation knock sound and smoking light to medium (just to clarify all measurements of parts were in spec). As the wagons circled in my head i drained the 10-30 and added 20-50, Why? Because 20-50 won't just burn off like 10-30 and it will heavily coat the pistons which can be seen when you shine a light in the spark plug hole, And 20-50 smokes like heck! So i drive it and it looks like i turned on a smoke machine, and shining a light in the plug hole the pistons were soaked! I mean bad! I disassembled the engine and installed OEM pistons and rings, reassembled and filled with 10-30 and the knock and smoke were gone after a couple laps to burn out all the oil in the exhaust. If the aftermarket pistons you are about to use don't look like factory or do not have a reputable name like Manley or Wiseco on em, Save yourself alot of time and trouble and don't use them. I will take photos tonight of the pistons so you all can see em.

BigBlockMan · 06-03-2010, 08:51 AM

Sucks on the piston issue. Just wanted to let you know the heavy weights like 20/50 are not good for air cooled engines, It actully makes them run hotter.

icemanls2 · 06-03-2010, 08:56 AM

I know, I was doing it for a quick test to show if what i thought was going on was correct. I only drove it down the driveway and back.

scottyb · 06-03-2010, 08:59 AM

We found the oil burning was worse when using multigrade oil in any of the robbins motors.

06-03-2010, 08:45 AM	#1
icemanls2 Not Yet Wild Join Date: Aug 2009 Posts: 8	OEM vs aftermarket pistons in Robin 295 Hi, I am new here but i've been lurking around for awhile and have been building carts for a long time. I thought i'd add to the information on here as there is alot of great info. I just rebuilt a robin 295 for a 99 TXT. I ordered the parts from LVS Sales Thinking i was getting OEM and got two white boxes with unlabeled aftermarket pistons,(All the rest of the parts i recieved were OEM). (I;m not bashing LVS and i should have asked beforehand) Anyways the OEM pistons have 6 small oil holes per side in the oil ring groove, the pistons i recieved had one large 2 inch opening the full height of the ring groove on both sides of the piston for oil. I looked at em and said WTH, those seem way too big (All new parts are good if they take the time to make them right?) So i installed the rings orientated properly and finished the build. I added 10-30 and drove it around and it had a detonation knock sound and smoking light to medium (just to clarify all measurements of parts were in spec). As the wagons circled in my head i drained the 10-30 and added 20-50, Why? Because 20-50 won't just burn off like 10-30 and it will heavily coat the pistons which can be seen when you shine a light in the spark plug hole, And 20-50 smokes like heck! So i drive it and it looks like i turned on a smoke machine, and shining a light in the plug hole the pistons were soaked! I mean bad! I disassembled the engine and installed OEM pistons and rings, reassembled and filled with 10-30 and the knock and smoke were gone after a couple laps to burn out all the oil in the exhaust. If the aftermarket pistons you are about to use don't look like factory or do not have a reputable name like Manley or Wiseco on em, Save yourself alot of time and trouble and don't use them. I will take photos tonight of the pistons so you all can see em.
icemanls2 Not Yet Wild Join Date: Aug 2009 Posts: 8

06-03-2010, 08:51 AM	#2
BigBlockMan Gone Wild Join Date: Feb 2007 Location: Southwest Georgia Posts: 1,469	Re: OEM vs aftermarket pistons in Robin 295 Sucks on the piston issue. Just wanted to let you know the heavy weights like 20/50 are not good for air cooled engines, It actully makes them run hotter.

06-03-2010, 08:56 AM	#3
icemanls2 Not Yet Wild Join Date: Aug 2009 Posts: 8	Re: OEM vs aftermarket pistons in Robin 295 I know, I was doing it for a quick test to show if what i thought was going on was correct. I only drove it down the driveway and back.
icemanls2 Not Yet Wild Join Date: Aug 2009 Posts: 8

06-03-2010, 08:59 AM	#4
scottyb Happy Carting Join Date: Dec 2007 Location: Southern California Posts: 73,417	Re: OEM vs aftermarket pistons in Robin 295 We found the oil burning was worse when using multigrade oil in any of the robbins motors.

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