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General Jet Boat Discussions
Impeller Size
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<blockquote data-quote="JL8Jeff" data-source="post: 424399" data-attributes="member: 12995"><p>I would check directly with Outboard Jets (https://www.outboardjets.com) to verify which model jet drive you have. It depends if you have the 90 degree V4 or the 60 degree V4 but they both look like R model jet drive which shows as 7-3/8. But the R85 shows a 3 blade impeller and the R4-60 shows as a 4 blade so it depends on your motor layout. You can't go to a 7-3/16 impeller, it will leave a large gap and give you very little thrust.</p><p></p><p>Model identification for Johnson-Evinrude</p><p>https://outboardjets.com/download/jet_drive_kits/Johnson-Evinrude-Blue-Binder-2015-PRICE-UPDATED-102716.pdf</p><p></p><p>Impeller identification for Large pump</p><p>https://outboardjets.com/download/large_series/Large%20Intake%20and%20Impeller%20Size%20Determination%20Updated.pdf</p></blockquote><p></p>
[QUOTE="JL8Jeff, post: 424399, member: 12995"] I would check directly with Outboard Jets (https://www.outboardjets.com) to verify which model jet drive you have. It depends if you have the 90 degree V4 or the 60 degree V4 but they both look like R model jet drive which shows as 7-3/8. But the R85 shows a 3 blade impeller and the R4-60 shows as a 4 blade so it depends on your motor layout. You can't go to a 7-3/16 impeller, it will leave a large gap and give you very little thrust. Model identification for Johnson-Evinrude https://outboardjets.com/download/jet_drive_kits/Johnson-Evinrude-Blue-Binder-2015-PRICE-UPDATED-102716.pdf Impeller identification for Large pump https://outboardjets.com/download/large_series/Large%20Intake%20and%20Impeller%20Size%20Determination%20Updated.pdf [/QUOTE]
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