New top end kit question

pri_i_oh · 06-11-2018, 04:59 AM

I bought a top end kit from buggies and I was told recently that people are having problems with the piston heating up and the pin in the top ring groove coming out and doing damage. I was told to pull that pin out and just let that top ring spin so the piston doesnt get damaged and the other 2 rings will still stop blow by. Anyone heard of this?

Lochlin · 06-11-2018, 07:02 AM

I have never heard of this. By the life of me I don't know why replacement pistons would heat up any more than the pistons they are replacing.

Does your cart have 3 rings? If so you would be ok with your plan. My Columbia carts (mid-80s) only have 2 rings.

pri_i_oh · 06-11-2018, 07:13 AM

Yea the kit I got from buggies unlimited has 3 rings

raydhd · 06-11-2018, 10:49 AM

I have had columbia pistons with both 2 & 3 rings. I sense the later produced replacement pistons had 3 rings on both the HD and columbia engines. There is a shot of my destroyed 3 ring harley/columbia piston in my bump of vegascart shipment and more shots of my and another members destroyed 3 ring piston in my electric cooling fan thread.

tew45 · 06-11-2018, 08:58 PM

If you remove the ring locating pin the ring will rotate and will hit one of the ports and mess up the piston and rings. The locating pins are there to keep the end of the rings from catching on the exhaust port and ruining the top end. If your getting too hot check the cooling fan and the ring gap on the new rings for the gap may not have enough clearance and be too tight.

pri_i_oh · 06-12-2018, 04:37 AM

That was my concern too. I dont have a cooling fan on mine. Is that an aftermarket thing?

tew45 · 06-12-2018, 07:48 AM

I may be out of my tree on this one but what engine do you have in this cart? All of the harley/columbia carts that have the 2 cycle engines have a factory cooling fan.

pri_i_oh · 06-12-2018, 07:52 AM

It's a 91 par car. Stock engine

tew45 · 06-12-2018, 07:58 AM

Sorry but I am not familiar with carts that new. I will check my information and see what I can do!

tew45 · 06-12-2018, 08:09 AM

I checked my info and the 91 Par Car does use the 2 cycle engine with a factory cooling fan.Do you have the manuals on that cart?

06-11-2018, 04:59 AM	#1
pri_i_oh Getting Wild Join Date: Jun 2015 Location: NE Ohio Posts: 127	New top end kit question I bought a top end kit from buggies and I was told recently that people are having problems with the piston heating up and the pin in the top ring groove coming out and doing damage. I was told to pull that pin out and just let that top ring spin so the piston doesnt get damaged and the other 2 rings will still stop blow by. Anyone heard of this?

06-11-2018, 07:02 AM	#2
Lochlin Gone Wild Join Date: May 2011 Location: Pittsburgh Posts: 2,948	Re: New top end kit question I have never heard of this. By the life of me I don't know why replacement pistons would heat up any more than the pistons they are replacing. Does your cart have 3 rings? If so you would be ok with your plan. My Columbia carts (mid-80s) only have 2 rings.

06-11-2018, 07:13 AM	#3
pri_i_oh Getting Wild Join Date: Jun 2015 Location: NE Ohio Posts: 127	Re: New top end kit question Yea the kit I got from buggies unlimited has 3 rings

06-11-2018, 10:49 AM	#4
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,642	Re: New top end kit question I have had columbia pistons with both 2 & 3 rings. I sense the later produced replacement pistons had 3 rings on both the HD and columbia engines. There is a shot of my destroyed 3 ring harley/columbia piston in my bump of vegascart shipment and more shots of my and another members destroyed 3 ring piston in my electric cooling fan thread.

06-11-2018, 08:58 PM	#5
tew45 Gone Wild Join Date: Aug 2007 Location: North Texas Posts: 2,312	Re: New top end kit question If you remove the ring locating pin the ring will rotate and will hit one of the ports and mess up the piston and rings. The locating pins are there to keep the end of the rings from catching on the exhaust port and ruining the top end. If your getting too hot check the cooling fan and the ring gap on the new rings for the gap may not have enough clearance and be too tight.

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06-12-2018, 04:37 AM	#6
pri_i_oh Getting Wild Join Date: Jun 2015 Location: NE Ohio Posts: 127	Re: New top end kit question That was my concern too. I dont have a cooling fan on mine. Is that an aftermarket thing?

06-12-2018, 07:48 AM	#7
tew45 Gone Wild Join Date: Aug 2007 Location: North Texas Posts: 2,312	Re: New top end kit question I may be out of my tree on this one but what engine do you have in this cart? All of the harley/columbia carts that have the 2 cycle engines have a factory cooling fan.

06-12-2018, 07:52 AM	#8
pri_i_oh Getting Wild Join Date: Jun 2015 Location: NE Ohio Posts: 127	Re: New top end kit question It's a 91 par car. Stock engine

06-12-2018, 07:58 AM	#9
tew45 Gone Wild Join Date: Aug 2007 Location: North Texas Posts: 2,312	Re: New top end kit question Sorry but I am not familiar with carts that new. I will check my information and see what I can do!

06-12-2018, 08:09 AM	#10
tew45 Gone Wild Join Date: Aug 2007 Location: North Texas Posts: 2,312	Re: New top end kit question I checked my info and the 91 Par Car does use the 2 cycle engine with a factory cooling fan.Do you have the manuals on that cart?

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