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Honda B75 carb issues

J

jdl9187

Member
Hey guys. I'm new to the site. I have a honda 4 stroke B75 engine that I am having issues with. I am not sure what year it is or how to find out what year it is, but when I pump the primer bulb from the fuel tank, it floods the carb with fuel. I know this should either be a stuck needle valve or float valve. Anybody have any advice on fixing this issue? And please feel free to correct me if there is something else wrong. Thanks guys
 
Take the carburetor apart for cleaning.--------------Make sure you get all the small passage ways.---------------------I bought 2 Hondas last year because owner could not find someone to clean them.----------Had both running after PROPER cleaning without spending a dime.
 
Don't have anything but support for both of your guys statements. Yes, stuck/leaking carburetor inlet and yes, take it down and clean/inspect/repair carb.
Good luck.
jimmyd
 
So I sprayed A TON of carb cleaner in the carb and let it sit overnight. That got the valve unstuck, so I no longer have that issue. The engine will turn over once in a while now. If I spray a little ether to it, it will run for about 2 seconds and shut off. This should still be an issue will the carb's internals gunked up correct? If I disassemble the carb to clean it, will I need any parts? Gaskets, seals, new needle and seat or anything? Or is it just a disassemble, clean and reassemble?
 
Yep you still have carburetor problems. If you continue to use ether as a starting aid, you will soon have engine problems. One of the worst things in the world to do to an engine. Change "running on ether" to read "ruining on ether". That crap, AND I DO MEAN CRAP, should only be used in a dire emergency.

Ok now! Down off me soapbox.

Yeah, I would recommend AT LEAST a new gasket/oring set. Below I've provided links to two different parts pages. The first is for a later model CDI ignition type "vintage" Honda and the second link is for an older breaker point ignition engine. Study the carb pages from each and see which one you have. You can order parts from these folks as well using these pages. You will just need to examine the inlet needle and idle screw to see if they need attention.

If they are "boogered" up, some of these parts aren't available anymore so you will need to do some creative machining or go on ebay to try to find replacements. Everything else should pretty much be clean and re-use. You need to pay VERY close attention to all the little holes in the intermediate jet and any passages in the carb. Don't try to half-ast it or you will be pulling it down again and again until it is clean. HTHY
jimmyd

http://www.boats.net/parts/search/H... VIN# BF75-1000002 TO BF75-1013304/parts.html

http://www.boats.net/parts/search/H...RD ENGINE, JPN, VIN# EV4000-100000/parts.html
 
Carburetors MUST BE TAKEN APART for cleaning.-----------------------Meticulous work--------------The shelves are full of " Mechanic in a can " because people are led to believe in the majic solution.
 
I haven't figured that puzzle out myself. The closest formula I have is if it has breaker point ignition then it is most likely a 70's to early 80's and if it says CDI on the cover it is mid 80's up to when they went to the new model lines. Somewhere around 1989 I think.

You might get hondadude's (Mike) attention if you start a new thread with this question. He might be able to answer as he is the most knowledgeable Honda Dude I know of.

Additionally, I realized that when I sent you the two links to illustrate the difference in the two carburetor styles, those pages were both for breaker point motors. That website lists CDI motors, I just fouled up and sent you the wrong page. You should use your serial number from the tag on the swivel tube for parts ordering. boats.net lists the serial sequence at the top of each parts page.

While most of these models have many parts in common, there are some subtle differences. I have purchased some old motors that I want to refurbish that have had the tags filed off (probably stolen at one time) so that makes it fun.
 
Hmmm...I dont recall seeing a tag on the swivel tube. Hope mine hasnt been filed off too. I'm at work until 8am but will check it out and see what I can find. My buddy that I got it from says he had it titled in SC where we live and would be glad to send in for a duplicate title. So......it should'nt be stolen.
 
Like I said, I am at work until 8am. I will see what I can find and get back to you in the morning. On what part of the frame should I find this number? On a tag/plate or just engraved on the frame?
 
Generally, there is a tag plate. The one we have here is on the vertical swivel of the engine right behind the engine mount.

Mike
 
I think it is a 1973. The model is probably a BF75K1. I say probably, because my chart does not indicate that there is a serial number on the frame for this motor. It implies that it is only on the engine (powerhead) itself.

If my assumptions are correct...it is the first outboard model that Honda introduced to the US. If you are not in the US, then my chart may not be accurate.

When you look up parts, look up by the model number B75K1.

Mike
 
Wow. Its in really good shape for a 1973. Although, someone has painted it a olive drab color because it was on a duck hunting boat.....and yes, it has a serial number on the powerhead also. not possitive if it is the same number. will have to check on it. Thank you for looking it up for me. This is the number I will use to order a new prop for it? Do you know of a place to find one? It has a small crack in it.
 
boats.net seems to work for most of the guys for parts.

I am not sure if the prop for that motor is available any more. You may have to get it repaired at a local prop shop.

Mike
 
Yep, that is right. You might try ebay. This part was unique to the 3 B75K models. Maybe you can find the entire carburator. Any hope to clean that one up or is it too far gone?

Mike
 
Been a little while since I have been on here. Just a little update tho. I tried to clean up the carb and it helped some. After it was all cleaned out, it will start and run but only for a couple of min. It will not stay running to long and dies with any throttle. A friend of a friend that works on hondas a lot says that the needle valve is too far gone, which is what I thought. The rubber like part is worn badly......lookin for a carb
 
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