720/740 over bore questions Help needed

• Mar 10, 2013

• #1

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Riptide

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I found a blown up 670 that I brought home with plans of a cheap rebuild, however having gotten it home and tearing it down it seems as though i picked up a 720? It has the ho head on it with 81mm pistons on what I believe to be a stock stroke. It came out of a 99 summit. Just below the engine number plate theres a number eteched in there c1093 which is probably from whoever modded it. any ideas where to get pistons as thats whats needed to be running. Engine came from the Edmontonish area

 

Last edited: Mar 10, 2013

• Mar 10, 2013

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• #2

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Riptide

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Forgot to add i heard people using kawaski jet ski pistons but would need a part number?

another post mentioned polaris ves pistons would work

 

Last edited: Mar 10, 2013

• Mar 21, 2013

• #3

team dirt

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Pro x makes really good pistons for the 740. Its been so long I wouldnt be able to tell you a part number though. Call mongoose they will be able to help you.

 

• Mar 21, 2013

• #4

250mark1

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The 720 was a much more reliable engine vs the 740

 

• Jan 26, 2014

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airbat

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I know im a little late but a polaris 700 piston is what i used for my 720.

 

• Jan 26, 2014

• #6

tex78

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740 used 800 sea doo pistons



sent while I should be drinking tea's