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  1. #1

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    84mm 66v cylinders on a 1300r EFI?

    I have not done much with the 1300 EFI. Bought an '03 - engine had water in it from previous owner and needs complete rebuild. I have everything to fix it except for a complete set of good 1300R cylinders. I can get them replated - but was wondering is there any advantage or disadvantage with using 66v cylinders bored and plated to 84mm on a 1300R EFI? I know porters tend to prefer the 66v (boost ports I think).

    Looking to keep this ski pretty much stock, reliable and decent on fuel for long rides up the river. I do not want to port and want to keep stock compression so I can fill up anywhere etc. D-plate, open air filters, maybe jetworks. I am still reading up on 1300r posts.. if anybody has any input I am open.

    Thanks!


  2. #2
    PolarisNut's Avatar
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    Dec 2006
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    You can't bore the 66v cylinders to 84mm and not correct the porting. The ports drop when you bore the cylinders. If you don't want to pay for porting, send your 60T cylinders off to have them replated/repaired.

  3. #3

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    Its not the money for the porting... just not looking for a total speed ski. Been down the 1390 and 1450 road...

    I did not really think 2mm/.05" would drop the port that much? More curious than anything...

  4. #4

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    Don't quote me on this....but I think you can space the cylinder up with a spacer to correct the porting, but you will also have to deck the top of the cylinders to get the correct squish also.

    If you start with a 1200 cylinder and bored to 1300, I've heard there is an advantage in rpms. Now if you go all out and have either set (1200 bored to 1300 or 1300) fully ported then I doubt there is much difference.

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