2005 honda 8hp Need advice after lots of Work Done using forum as guide

[Will K]

Ok so I got a non running motor 2005 8hp Honda short shaft pull start (vin BZBC 1900033). I managed to get it running after reading the forums but still have problems. Here is what I did

I pulled carburetor and cleaned reinstalled now it idles fine; made note of the low idle jet small hole also removed the brass plug to get at needle valve cleaned and reset at 1 ? turns out from bottom -/+ .

Pulled out thermostat checked cleaned reinstalled ran line down water openings and put some vinegar into system and flushed.

Pulled fuel pump looks ok the rubber is not too stretched and it creates suction when I push the button, cleaned small filter in pump.

Checked for Top Dead Center and everything lines up properly as far as I can tell from what I read.

Pulled plugs they looked black but ok, gap seemed good sanded points with 800 grit, sprayed PB blaster in cylinder, reinstalled plugs.

Removed Fly wheel replaced timing belt it was torn.

Cut section of fuel line out as had a leak.

OK so now it?s running in a 55gal garbage can, water is pumping fine, and idles nice both at low and high RPM NOT IN GEAR. I added a little PB blaster and acetone to the gas and a little PB blaster and lucas to the oil, oil light is green. Ran it for about 1/3 gallon of fuel from a bottle with the fuel line stuck in it.

When I first put it into gear in the Garbage can and applied throttle it did not want to throttle up i.e. bogs when in gear, when not in gear revs up fine. I managed to get it to throttle up once but it made allot of water flow out and I lost prime in the water pump started to trickle and before I knew it heated up significantly so I shut it off it did not shut down on its own, it was sizzling a little near back when water was splashed. I started it after this and now there is a strange knocking and still will not go into high RPM in gear in water .

Questions?

1 Is the bucket causing RPM bog down problem as the prop is almost at the edge where the bucket wall and exhaust come together.

2 Did I kill the motor running it without water?

3 any other tips tricks etc?

Thanks For taking the time to read and reply

 

[Will K]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

Wow all these people viewing the thread but not one reply, I will take a video of the motor and maybe then I will get some feedback.

 

[TOHATSU GURU]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

1) No

2) Probably

3) A systematic approach to diagnosis and repair is the best way to determine what the problem is and how to correct it. So, pick up a service manual and start with one of the engines three main systems. Under your circumstances the first one to look at now is mechanical.

 

[Will K]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

OK so the reason for the knocking sound was because of the flywheel being loose so thats fixed.
still not running properly under load in gear so cleaned carb again clean as a whistle looked good.
Has to be a fuel pump issue any ideas how to test a fuel pump?
i was told that if you remove it from the motor and blow/ force fuel through it the fuel should not be able to come out is this correct? Thanks for any and all info

 

[TOHATSU GURU]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

A systematic approach to diagnosis and repair is the best way to determine what the problem is and how to correct it. So, pick up a service manual and start with one of the engines three main systems.

There is no shortcut to determing the problem.

 

[isaksp00]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

Why not remove and service the fuel pump, just in case? If the 2005 is anything like my roughly '94 BF8A, it is not hard to do, and the diaphragm is not too hard to replace. There are some small one-way valves, like reed valves, in there, that might not be working well. I have no idea if fuel pump issues are likely to cause your symptoms, but if you suspect this, look at it and rule it out.

I don't know how to test it, but I know that when it is removed you can push the plunger in and out and sort of feel the air pressure on the output side - hardly a real test, as there would be no way to know if it is correct. Also, if the diaphragm is bad (which I suppose could cause those symptom) it should be fairly easy to see.

If the comment about blowing air through it is correct, I would think blowing on the input side ought to let air flow and on the output side, not. The diaphragm is thin, so I wouldn't use compressed air!

 

[TOHATSU GURU]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

There is no harm in doing anything to your own engine...Other than wasting your own time and money. I preach a systematic approach to outboard service rather than a random shotgun approach. Spending time and money unnecessarily is just wasteful. It doesn't mean that someone is stupid for doing it...It's just not the best way to get the engine cured

 

[Will K]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

I removed the fuel pump unit and broke it down into its simplest components there is no problem with the fuel pump as far as I can tell however I think a new membrane will be the first step i take just to rule it out, very possible it has lost to much elasticity and is not keeping up with the fuel needs at high RPM this is all dependent upon price however. Just to be clear this is my first 4stroke motor and have usually had 2strokes Yamaha's that are near amazing in the longevity they provide. After reading about the Honda's it would seem they are very temperamental. It still amazes me that someone has not had an issues with lag during rev up while in gear, I was showing a mechanic friend what it did in the bucket as it began to bog down and hesitate under load during rev up and then eventually dying he thinks it may be because of the back pressure the water in the tank produces as the load is applied to the back of the blades? seems reasonable but I have been told otherwise. Have a marine mechanic friend who i am going to call and see if he has any ideas maybe he has a manual for the engine, but i'm into the motor all of $90 that's cost of motor and materials so far. I can always part it out on e-bay but would rather not. again any and all info greatly appreciated but please Tohatsu Guru enough already not looking for shortcut and I too use logical systematic approaches, just a little experience from anyone that has had this problem with this make model would help; sort of like the low idle jet having the small hole or the fly wheel making the mechanical knocking sound etc.

 

[Star]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

Will,
We are all sorry that you are done with Iboats forum. It is good that you had Yammies becuse from the sound of things you are dangerous. How many foot pounds of torque did you tighten the flwheel nut with?? Most of us here have limited experience with Hondas
because it is harder to get info on them, and if you can afford one most take it to the dealer and pay for it. I even wonder if you have it timed right. Do you know how to check the valve lash? Your problem is in the carb, not the fuel pump. You have to do more than sprinkle carb cleaner over it.

 

[Will K]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

Hey Star I am really sorry that you are such a tool. From the sounds of it I should have my cousins in the Hamptons pay you a visit. You sound very knowledgeable with the advice you give or lack of it should I say. Guess most people here are not mechanics as that would explain the lack of knowledge base. My guess is you speak from your sphincter and advise all people to go to a mechanic but then why post on the forum you self serving dolt, hmm this is how i polish stuff with my pampers ohh aluminum boat. I have fixed more things that other people have broken than you can imagine. Let me see I took a non running honda and now it runs for the price of two bottles of carb cleaner a water pump and timing belt and 12 hours of labor. Its funny because I have been burned by more mechanics and given a bill that does not justify the work. if you want something done right do it yourself. You would last 3 months out of your crib, cheers and good day jackass.

 

[Star]

Re: 2005 honda 8hp Need advice after lots of Work Done using forum as guide

OK will,
I did not advise you to go to a mechanic! Your approach to solve the problems with this motor shows me that you are not a mechanic. If you put a monkey in a room with a piano sooner or later he will play something! Your motor is not running by any standard. Sure you may have fixed alot of things this isn't one of them... yet!