Honda 4 stroke upgrade

[Pete Munoa]

I currently have a 1999 honda four stoke outboard.. I was told that the only difference between the 75 and 90 are the carbs. Is this the case? I want to make mine a 90. I talked to the local honda dealer and he said that was the info that a top dog at honda told him.. Is this the case? Also, does $1000 sound about right to replace and upgade the 75 to the 90?<br />Thanks guys.

 

[corm]

Re: Honda 4 stroke upgrade

Hi Pete,<br />If the cam is the same part number and the valves the same then you can.<br />As far as the cost,is it worth it to you?<br />You will also need the next larger prop to hold the RPMs down. It may change your tourqe<br />curve some.If the motor was made as a 90 and detuned to a 75 it will be snappy when given to chance to breath.<br />...good luck...corm

 

[nicko]

Re: Honda 4 stroke upgrade

You will void your warranty. Alot of trouble for 15 horses. I would try a high end SS prop.