MVVS26cc PISTON help
11-18-2008, 02:33 PM
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MVVS26cc PISTON help
Hello everyone i need some advise ..i strip down my mvvs 26 to change a bearing and i didnt mark the way that the piston goes ...the piston has a big opening at the botom off the one side and a smaler opening at the other side ..which side is the front??
11-18-2008, 02:48 PM
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RE: MVVS26cc PISTON help
ORIGINAL: aandreas
Hello everyone i need some advise ..i strip down my mvvs 26 to change a bearing and i didnt mark the way that the piston goes ...the piston has a big opening at the botom off the one side and a smaler opening at the other side ..which side is the front??
Hello everyone i need some advise ..i strip down my mvvs 26 to change a bearing and i didnt mark the way that the piston goes ...the piston has a big opening at the botom off the one side and a smaler opening at the other side ..which side is the front??
CR
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11-18-2008, 02:59 PM
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RE: MVVS26cc PISTON help
The other thing you have to look out for is when the piston is put into the cylinder just make sure the the opening in the rings do not hit any of the ports, If they do it could cause them to break while running. The rings should have a locking pin to hold them in one place.
Milton
Milton
11-18-2008, 07:39 PM
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RE: MVVS26cc PISTON help
ORIGINAL: arobatx
....and typically, if the ring groove is pinned, I've found the pin location will usually be opposite the exhaust port. Pe will probably speak up soon and put this all to rest for sure though
....and typically, if the ring groove is pinned, I've found the pin location will usually be opposite the exhaust port. Pe will probably speak up soon and put this all to rest for sure though
CR
11-19-2008, 11:11 AM
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RE: MVVS26cc PISTON help
the piston has a date code, that should be on the same side as the large radius cutout. That points to the front of the engine, so the cutout clears the bearing.
The antirotation pin is on the exhaust port side.
The antirotation pin is on the exhaust port side.
11-19-2008, 11:33 AM
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RE: MVVS26cc PISTON help
Thanks for clarifying that PE....I think my head was in ZDZ80 land, where the pin is opposite the exhaust port. Interesting Charley notes that his older piston ring groove is not pinned...
11-19-2008, 12:05 PM
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RE: MVVS26cc PISTON help
ORIGINAL: pe reivers
the piston has a date code, that should be on the same side as the large radius cutout. That points to the front of the engine, so the cutout clears the bearing.
The antirotation pin is on the exhaust port side.
the piston has a date code, that should be on the same side as the large radius cutout. That points to the front of the engine, so the cutout clears the bearing.
The antirotation pin is on the exhaust port side.
As you say, it does have a pin in it. Guess I misremembered about that detail.
CR
11-19-2008, 12:17 PM
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RE: MVVS26cc PISTON help
ORIGINAL: arobatx
Thanks for clarifying that PE....I think my head was in ZDZ80 land, where the pin is opposite the exhaust port. Interesting Charley notes that his older piston ring groove is not pinned...
Thanks for clarifying that PE....I think my head was in ZDZ80 land, where the pin is opposite the exhaust port. Interesting Charley notes that his older piston ring groove is not pinned...
On your piston, where does the ring gap fall in the sleeve?
CR
11-19-2008, 02:16 PM
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RE: MVVS26cc PISTON help
ORIGINAL: Charley
Huh, the original piston from my 26, bought in December, '03, has a B stamped on the top but it's opposite the oval cutout for bearing clearance. the opposite side of the piston skirt has no oval cutout; just the rectangular one that is in both sides. Is that B a date code?
As you say, it does have a pin in it. Guess I misremembered about that detail.
CR
ORIGINAL: pe reivers
the piston has a date code, that should be on the same side as the large radius cutout. That points to the front of the engine, so the cutout clears the bearing.
The antirotation pin is on the exhaust port side.
the piston has a date code, that should be on the same side as the large radius cutout. That points to the front of the engine, so the cutout clears the bearing.
The antirotation pin is on the exhaust port side.
As you say, it does have a pin in it. Guess I misremembered about that detail.
CR
