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<blockquote data-quote="turbotodd" data-source="post: 454548" data-attributes="member: 7376"><p>Also on the EFI yamaha&#039;s the ECU is different...in that the timing and injection are mapped differently because of the lack of a true &quot;neutral&quot; on the jet-specific motors.&nbsp; That is why dealers won&#039;t sell you a prop drive motor and convert it to a jet.&nbsp; You have to order it as a specific jet, for instance &quot;F40JEHA&quot;.&nbsp; It looks JUST like a short shaft 40 (which is not made to my knowledge) but doesn&#039;t have shift linkage and the ECU is completely different, among other subtleties.&nbsp; We have done it..convert a prop EFI motor to jet, and it doesn&#039;t work nearly as well as getting a jet-specific motor.&nbsp; Nowhere near as well to be honest.&nbsp; One big problem was the fast idle and cold-start enrichment mapping in the ECU, with the jet, you were idling with a load against it at 1500 RPM, and about 7-8 mph if you had it in &quot;forward gear&quot;.&nbsp; Guy stuck the prop foot back on it and sold it, bought a jet specific F40 and has been absolutely tickled ever since!</p></blockquote><p></p>

[QUOTE="turbotodd, post: 454548, member: 7376"] Also on the EFI yamaha's the ECU is different...in that the timing and injection are mapped differently because of the lack of a true "neutral" on the jet-specific motors. That is why dealers won't sell you a prop drive motor and convert it to a jet. You have to order it as a specific jet, for instance "F40JEHA". It looks JUST like a short shaft 40 (which is not made to my knowledge) but doesn't have shift linkage and the ECU is completely different, among other subtleties. We have done it..convert a prop EFI motor to jet, and it doesn't work nearly as well as getting a jet-specific motor. Nowhere near as well to be honest. One big problem was the fast idle and cold-start enrichment mapping in the ECU, with the jet, you were idling with a load against it at 1500 RPM, and about 7-8 mph if you had it in "forward gear". Guy stuck the prop foot back on it and sold it, bought a jet specific F40 and has been absolutely tickled ever since! [/QUOTE]

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