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Author Topic: Model 21/28 Piston clairification  (Read 4228 times)

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Offline Toadworks

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Model 21/28 Piston clairification
« on: March 01, 2011, 10:14:49 am »
Model 21/28 pistons come in many flavors as I can find, a coated piston, non coated, single oil ring (factory assembled spring type), separate three piece oil ring. I am looking for some help filling in some blanks......

STD BORE:
#796155 three separate pieces for the oil ring, and is coated (may be magnesium or aluminium)
#792307 with a single oil ring (I don't know if it is coated or not)

+.020 BORE:
#792728 I can't find a 'real' picture of this one.
#797010 this appears to be the coated one with three piece oil ring

I have tried the 796155 and DO NOT like the oil ring set up. I want a coated piston, single oil ring STD bore P/N and I want the .020 coated, single oil ring P/N's

I also want the non-coated numbers for both sizes too. Any one have this info? I have been trying to find 'real' pictures of all the P/N's but have been unsuccessful.

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Offline Toadworks

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Re: Model 21/28 Piston clairification
« Reply #1 on: March 02, 2011, 06:17:28 am »
What does a 792307 piston look like?
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Offline George Herrin

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Re: Model 21/28 Piston clairification
« Reply #2 on: March 02, 2011, 07:00:40 am »
I will take a look at work and see what we have in stock and try to compare. I believe we stock the 796155 piston though
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Offline Toadworks

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Re: Model 21/28 Piston clairification
« Reply #3 on: March 02, 2011, 07:27:48 am »
Thanks George, of course once I get this all straight in my mind, Briggs will change all the numbers again.......

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Offline George Herrin

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Re: Model 21/28 Piston clairification
« Reply #4 on: March 02, 2011, 08:09:35 am »
YUP that they will
the 792307 is a short avs aluminum piston the sides of the skirts are coated.
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George Herrin #6
Indian Power.. You gotta Go big to beat em or Go HOME
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Offline Toadworks

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Re: Model 21/28 Piston clairification
« Reply #5 on: March 02, 2011, 11:53:39 am »
Thanks George!

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Offline Toadworks

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Re: Model 21/28 Piston clairification
« Reply #6 on: March 05, 2011, 06:36:47 am »
Still need help.......

I have a 796155 STD bore piston, It is a magnesium short skirt, it uses the three separate piece oil ring. I looked up the numbers for new rings and ordered the 698375 STD ring set. That ring set has the two piece spring style oil ring. The problem is that oil ring DOES NOT fit the groove in the 796155. The groove is about .020 narrower than the ring!!

I can't seem to find a different ring set.

Does anyone know the PROPER ring set number for a 796155?

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Offline fx28

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Re: Model 21/28 Piston clairification
« Reply #7 on: March 05, 2011, 08:40:04 am »
partsmart says  #792306 for piston 796155

Chuck Miller
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Offline BIG AL 202

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Re: Model 21/28 Piston clairification
« Reply #8 on: March 05, 2011, 11:30:43 pm »
ARE ONLY THE SKIRTS COATED OR TOP AND SKIRTS ON ANY OF THEM?
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Offline Toadworks

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Re: Model 21/28 Piston clairification
« Reply #9 on: March 06, 2011, 07:17:42 am »
The 796155 is fully coated in ceramic, it's actually white when new. I don't know about the other numbers..... I THINK they are Teflon coated on the skirt only.
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Offline BIG AL 202

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Re: Model 21/28 Piston clairification
« Reply #10 on: March 06, 2011, 02:36:33 pm »
ON THE 796155 IS THE SKIRT TEFLON OR CERAMIC? I THINK YOU CAN TEFLON OVER CERAMIC OR AT LEAST REMOVE AND COAT THE SKIRT.
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