problem with a bf75l after a 25 year stroage.

[geol]

I Recently bought a Honda # BF75L 1300653. That had been in storage for? 25 years. The Original owner according to the story. Used it for 1 season then put it in storage. The Po bought it from his estate. [Friend of the family] He initially fird it up then did some Unspecified work on it and it worked for a short time then would not idle.
So he sold it to me. The engine appears to be in nearly new condition. It will fire up on the 3rd ? pull with the choke one. It will not Idle in N. It will not run unless the choke is engaged at a variable rate. The engine speed wants to run away as I reduce choke. I Have a factory manual. OK the PO fairly obviously put AL containing gas in the original steel tank. It disolved the paint on the gauge shaft.
Questions. Do I need to disassemble the carb. and clean and reassemble.
2 do I need to rebuild it.
3. did the Alcohol destroy the rubber bits in the carb and or the fuel pump in ~1year. of sitting with that fuelmin the engine.
Any Ideas including adjustments the PO might have FU in an attempt to make it run.

 

[Sea Rider]

Re: problem with a bf75l after a 25 year stroage.

Is that a 7.5 single carb or a 75 HP multi carbed engine ? Definitely strip carb or all carbs down and soak in real clean dip for some hours, change fuel pump's diaphragms, probably dried out, cracked. Clean fuel tank, fuel filters and purge complete fuel line. With fuel system completely clean and operative engine should run well. Are you advancing throttle grip to match steering handle mark with choke pulled out all the way when pulling rope to start engine ?

Happy Boating

 

[geol]

Re: problem with a bf75l after a 25 year stroage.

It is a 7.5 HP Single carb. Sounds like good advice. I do put the steering handle on the start position and give it full choke . I am able to get it to run for a minute or more by fiddleing with the choke. But as I open the choke the engine wants to over rev then die. I don't know what adjustments the PO made when he attempted to get it to run. I did purge the system but Have not yet removed the carb or the fuel pump. The Fuel pump does seem to be operating. So far I have not found a replacement for the Diaphram it is listed as discontinued. I am a little iffy as to the proper adjustments as the factory manual is not clear.

 

[Sea Rider]

Re: problem with a bf75l after a 25 year stroage.

If you need to play with choke to maintain engine running, you have a carb or fuel pump issue. Try primming fuel bulb constantly, if revs catches up and engine stays on it's a faulty pump issue. Anyway will need to have both checked if not, will be eternally guessing. If diaphragams are not available any more and your horse happens to have simple flat diaphragams you can duplicate them using Kodak, 3M X ray film or thin hypalon fabric.

Happy Boating

 

[isaksp00]

Re: problem with a bf75l after a 25 year stroage.

If it is at all like my 8HP Honda, there is a low speed idle circuit jet that can be removed from the top of the carb, and I find that it clogs very easily. If clogged, it won't idle without choke or unless throttle is up well above idle setting. I'd pull the carb and clean it thoroughly, as per SeaRider's advice, and check that idle jet carefully. If it si so old you can't get a fuel pump diaphragm, I'd not invest much in it, and if you find the o-rings and such in the carb are shot, can you get new ones still?

 

[geol]

Re: problem with a bf75l after a 25 year stroage.

If it is at all like my 8HP Honda, there is a low speed idle circuit jet that can be removed from the top of the carb, and I find that it clogs very easily. If clogged, it won't idle without choke or unless throttle is up well above idle setting. I'd pull the carb and clean it thoroughly, as per SeaRider's advice, and check that idle jet carefully. If it si so old you can't get a fuel pump diaphragm, I'd not invest much in it, and if you find the o-rings and such in the carb are shot, can you get new ones still?

Thanks I will check on the low speed jet. I just contacted the po and he did diassemble and clean the carb. So I am suspecting a float level problem. But I will do a carb and fuel pump disassembly clean and inspect. As to the fuel pump diaphram I have a source of out of print carb and fuel pump parts. But the link is in an old computer that I retired about a year ago. so I will have to look it up.

 

[geol]

Re: problem with a bf75l after a 25 year stroage.

I Reset the butterfly linkage to closed as specified in the factory manual. Then it started on the second pull and altho it Idled too hi and continued to surge for several minutes as the fuel system stabilized. I was able to adjust the idle to the point where it is slow enough to shift and fast enough to not die when the gear is engaged. Initially it would shift into forward but not reverse. Now it seem to work well. I had a friend with experience in owning and maintaining a similar 8HP Honda 4 stroke take a look and after fiddling with combination of the iddle jet ant the fast idle cam it settled to something that sounds right. Thank you for you feedback and encouragement. I did contact the PO and he had dissembled and cleaned the carb. and replaced the spark plugs and changed the oil and the gear lube. but that was all. It is electronic ignition [no points] So that system appear to be fine. The engine if was only used 1 season as the story goes. is probably still in its break in phase. All the paint is original and in excellent condition. I will open up the fuel pump and inspect the diaphram. I will need to find a source of replacement parts. Thanks again for the good suggestions.

 

[geol]

Re: problem with a bf75l after a 25 year stroage.

Now I need to find an Remote control bracket for it so I can use it on my 1959? 18ft. Chetec lapstake runabout.