Home » Forums » Fishing Essentials » Boating/Engine - Information/Questions - Trouble Shooting - Quick Fixes

2000 Yamaha 40XWT correct premix ratio??

Submitted by Mr M on Tue, 2012-10-16 19:55

 Hi guys,

I've bought a boat recently that came with a premix 40hp 2 stroke motor. I don't have the original owners manual to confirm correct oil/fuel ratio.. Dealer told me 50:1 but the manual I downloaded from Yamaha sais 100:1. The motor runs great. Is to much oil bad for the motor?

Would be great to get a confirmation from someone that has the same motor of similar age what does their original manual sais is the correct ratio.. 

‹ Can you ID this hull? HELP plz. How do i remove these controls ›

billy69

Posts: 125

Date Joined: 16/01/12

Ive got a 2000 Yamaha 50 cv

Tue, 2012-10-16 21:35

Ive got a 2000 Yamaha 50 cv two stroke on mine and saw the same thing in the manual. But

i was also told that was only with yamaha two stroke oil.

 

I have always run mine at 50:1 as ive seen the damage that can be done when there is not enough oil

in a two stroke mix.

 

 

Nauti Buoy

Posts: 595

Date Joined: 20/04/09

Yamaha CV

Wed, 2012-10-17 07:16

I have a 40hp CV the dealer i got it from recommended 50:1 for the first 10 hours and then mix it at 75:1 using quality oil, even though they say you can run it at 100:1.

I find at 50:1 it was very smoky, but 75 seems pretty good.

Mr M

Posts: 8

Date Joined: 13/07/12

 Thanks for the replies

Thu, 2012-10-18 11:09

 Thanks for the replies guys.. I'll have another chat with the dealer too..