Converting Honda BF35 to BF45

[Rotti]

Hi guys,<br /><br />just recently weve had this topic in here already, I know..... Since there were all kinds of postings Ive got me an original Honda parts-catalogue and worked completly through the motor-section: As it turns out, the only things that are different from a BF35 to a BF45 are the jets in the carburetors! Thats it, nothing else. No different camshaft, no different valves and no different carburetor-cam at all! There might be a carburetor cam available to easily reduce the hp of a 45hp motor to run it on lakes where not more is allowed, but Honda never did it that way (at least according to their own parts-catalogue!). So lets start the discussion all over again, because there might be a true benefit for all owners of the low-output/same displacement Honda- outboards in here (the 35s and the 40s to be precise)- I really want to know some pro´s oppinion on this, because if changing the jets and re-adjusting the carbs is all that is needed to gain some true 10hp Ill definetly go for it!!!<br /><br />many greetings from Germany,<br />Rotty

 

[Skinnywater]

Re: Converting Honda BF35 to BF45

Did you cross reference the part numbers of the ignition control unit also?<br /><br />While your at it, cross reference both primary gears to.

 

[Rotti]

Re: Converting Honda BF35 to BF45

Hi Skinnywater,<br /><br />just read your answer and checked the things you mentioned: no difference in these parts as well, nothing! Really looks like you only have to change all the jets and do a complete tune-up for the carbs, thats it. When Ive finished building a complete new lower-unit from scratch and colected parts (do you now some for a BF35, maybe somebody who sells a complete one, no matter wether its working or not...) Ill definetly do this- before I will again cross-check everything with help from my dealer, just to be assured 100% that itll finally work well!<br />greetings,<br />Rotty

 

[Skinnywater]

Re: Converting Honda BF35 to BF45

I don't doubt that is all it takes to make a 45 out of a 35. To make a 50 it'll require a lot of parts. <br /><br />I don't know anyone selling the parts you need.<br />I'll assume you've already checked here with iboats. If you have check back with them again and ask for their suggestions on a source.<br />Your dealer can also help you.<br /><br />Keep us posted.

 

[mieyk]

Re: Converting Honda BF35 to BF45

I'm pretty sure the carb bore is larger as well. If all you would need to do was replace the jets, it would mean the stock 35 runs lean or the 45 runs rich. If you increase fuel you must increase airflow. I was thinking of doing this with mine also.