Honda   Honda Outboard Parts
 
Honda Outboard Forum Honda Outboard Parts Discussion Forum Honda Outboard Parts Boat Parts Honda Outboard Forum Outboard Motor Parts Contact Us
Honda Parts
  #1 (permalink)  
Old 07-25-2008, 01:41 AM
Junior Members
 
Join Date: Jul 2008
Posts: 2
Default BF100 won't idle

Picked up an older model BF100 about three weeks ago. Looks like it has had very little use and has run well. Started it tonight, starts easy. It runs with throttle in the start position (choked and open) but will not idle in the shift position. I've played with the idle speed adjustment and it will only idle when adjusted way up basically in the same position as when it is in start. It also sounds like RPM is fluctuating when in the start position. From reading the other posts it looks like every one will recommend cleaning the carb. Is there anything else I should be looking for and anything specific in cleaning the carb? One more thing; When it idles in start and you throttle down to shift it stays revvved high for awhile then just dies out.
Reply With Quote
  #2 (permalink)  
Old 07-25-2008, 08:37 AM
Junior Members
 
Join Date: Jul 2008
Posts: 8
Default

Sounds like a carburettor issue.
Remove the carb and take it completelyto pieces.
If you don't have a manual, make a note/draw sketches of where all the bits go.
**** out all the passages with compressed air, especially the idle air bleed under the idle mixture screw which sticks out the side of the body at an angle and has a spring under the screw to retain the setting. When reassembling turn this screw in until spring just starts to contact body, then screw in one more complete turn.
Check the fuel level float setting by assembling the float and fuel needle. Then turn the carb upside down and the fuel float and "hinge" arm should be horizontal with the fuel needle on its seat.
Put it all back together and refit to engine. Make sure that carb/manifold gasket is in good condition, add a little joint compound. Pump fuel up to carb from tank and start engine. You will need to run it at high idle while you adjust idle mixture screw in or out to get engine speed to increase. When it increases, back off on throttle stop screw to reduce idle speed, then fiddle with idle mixture screw again (in or out) until you get highest speed, then back off throttle stop some more until you get nice steady tick over.

Tanzer
Reply With Quote
  #3 (permalink)  
Old 07-25-2008, 08:39 AM
Junior Members
 
Join Date: Jul 2008
Posts: 8
Default

Quote:
Originally Posted by Tanzer View Post
Sounds like a carburettor issue.
Remove the carb and take it completelyto pieces.
If you don't have a manual, make a note/draw sketches of where all the bits go.
**** out all the passages with compressed air, especially the idle air bleed under the idle mixture screw which sticks out the side of the body at an angle and has a spring under the screw to retain the setting. When reassembling turn this screw in until spring just starts to contact body, then screw in one more complete turn.
Check the fuel level float setting by assembling the float and fuel needle. Then turn the carb upside down and the fuel float and "hinge" arm should be horizontal with the fuel needle on its seat.
Put it all back together and refit to engine. Make sure that carb/manifold gasket is in good condition, add a little joint compound. Pump fuel up to carb from tank and start engine. You will need to run it at high idle while you adjust idle mixture screw in or out to get engine speed to increase. When it increases, back off on throttle stop screw to reduce idle speed, then fiddle with idle mixture screw again (in or out) until you get highest speed, then back off throttle stop some more until you get nice steady tick over.

Tanzer
PS. Make sure choke is fully open before you start playing with idle mixture.

Tanzer
Reply With Quote
  #4 (permalink)  
Old 07-25-2008, 11:58 PM
Junior Members
 
Join Date: Jul 2008
Posts: 2
Default

Thanks, that did the trick. I think it runs better now at all speeds. The motor had been sitting for at least 3 years when I got it. So it stands to reason the carb was full of gunk. I saw you posted on a light bulb for the oil light. Did you find anything out? While playing last night mine burned out. I found a bulb same size but different number at the boat store. It lit up when I put it in the socket, but of course I broke it when trying to get it back in place right. This brings up another question.
The electrical outlet on the side shows a variable voltage from 3v at idle to 27v at full throttle. Is this normal? If so I guess I would need a voltage regulator. I was also thinking that maybe since my oil light was out they could be wired in series and the light bulb would limit output viltage. I guess I will know when I get another new bulb. Any thoughts on this?
Reply With Quote
  #5 (permalink)  
Old 07-30-2008, 05:21 PM
Junior Members
 
Join Date: Jul 2008
Posts: 8
Default

Glad to be of help.

Re your second point - NO, NO, NO !

The oil pressure warning light gets it's signal from the CDI unit and runs at about 30 volts (it's on or off). It's some sort of special (gas filled ?) bulb that gives off a neon type glow as soon as there's sufficient oil pressure. I got one from my local dealer Pt# H37210-ZV4-003 for $43 which is the same price I was quoted via the forum.
The rectifier output does have an open circuit voltage varying between 3 and 30 volts or so, but it is very low power so as soon as you connect it directly across a 12 volt battery it only puts in maybe 1 or 2 amps even at full throttle. I use mine on a sailboat so only run the engine for 15 or 20 minutes at a time so have never had any problem with overcharging. I suppose that if you use the engine on a small fishing type boat with the engine running all the time you are on the water it may be possible to overcharge a battery, but I doubt it.
Tanzer
Reply With Quote
  #6 (permalink)  
Old 09-18-2008, 02:43 PM
Junior Members
 
Join Date: Sep 2008
Posts: 3
Default

I have the same problem with my carb, but I do not understand these: "Check the fuel level float setting by assembling the float and fuel needle. Then turn the carb upside down and the fuel float and "hinge" arm should be horizontal with the fuel needle on its seat." Any one have a pics?
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


All times are GMT -4. The time now is 06:33 AM.

Outboard Parts

Other Forums
Yamaha Parts
Suzuki Parts
Evinrude Parts
Johnson Parts
Mercury Parts

Copyright 2000 - 2014, Outdoor Network LLC