BF45A with Carb issues

[socal01]

Ran but lacked power. Ran much better with the choke.I removed and cleaned the carbs and ran better but still not better. Removed the carbs again and cleaned with carb cleaner. I removed the main nozzle, (like mentioned on other threads), and the piece that sets in that with a rubber o-ring. Runs better but still in order to wind it out I have to use the choke. The local dealer says "sometimes you can not get all the jets cleaned out and have to buy new ones". I am going to pull them off again and do a dissamble and soak in chem dip or take to a carb shop where they use some type os special machine I heard of. Also thinking of removeing the factory cap on the top that covers one of the air jets.

Is there a certian jet that ushally clogs that i could have missed? Or maybe they need to be synched with a specail tool although I to not think a sync issue would cause the choke to make it run better.

Any thoughts?

 

[socal01]

Re: BF45A with Carb issues

Seems to a shortage of carb experts here.

I made progress....

I think the main issue here has been that the carbs are out of sync. The main nozzle and idle jet were working fine because it was always idling fine. I took a rubber hose and synched the carbs by ear. I bottomed out all three adjuster screws, (the one external and on the outer side of the carbs). Then while listing to the "hiss" adjusted until the hiss was even across all three and the motor was running smooth. The only thing I am unsure of is what the spec is for how many turns out to set the "pilot screw". It seems to run better at around 2.75-3.0 truns out. I am at 5500' elevation but this seems like a bit much. Does anyone know that the spec should be for how many turns on this screw? I still need to test on the water under load but thus far it seems to rev much smoother with no sputter or spitting. I am also going to try to locate a sync tool -- something like this

http://www.chaparral-racing.com/Cha...alse&mscssid=0FF3175B72A7452397F4A17D6FA4647A

Does anyone know of a sync tool for these type of carbs? Should a motorcycle type work?

I also found some small in-line filters and placed between the fuel pump and carbs.

 

[socal01]

Re: BF45A with Carb issues

Seems to a shortage of carb experts here.

I made progress....

I think the main issue here has been that the carbs are out of sync. The main nozzle and idle jet were working fine because it was always idling fine. I took a rubber hose and synched the carbs by ear. I bottomed out all three adjuster screws, (the one external and on the outer side of the carbs). Then while listing to the "hiss" adjusted until the hiss was even across all three and the motor was running smooth. The only thing I am unsure of is what the spec is for how many turns out to set the "pilot screw". It seems to run better at around 2.75-3.0 truns out. I am at 5500' elevation but this seems like a bit much. Does anyone know that the spec should be for how many turns on this screw? I still need to test on the water under load but thus far it seems to rev much smoother with no sputter or spitting. I am also going to try to locate a sync tool -- something like this

http://www.chaparral-racing.com/Cha...alse&mscssid=0FF3175B72A7452397F4A17D6FA4647A

Does anyone know of a sync tool for these type of carbs? Should a motorcycle type work?

I also found some small in-line filters and placed between the fuel pump and carbs.

 

[socal01]

Re: BF45A with Carb issues

Using the Carb Sync tool in the link above I was able to sync the carbs and the motor now runs perfect! The only thing I am still unsure of is HOW MANY TURNS OUT or the range of the pilot screws??? I have a clymer manual but it does not specify. If anyone know the range please reply.

Thanks!

 

[Skinnywater]

Re: BF45A with Carb issues

Using the Carb Sync tool in the link above I was able to sync the carbs and the motor now runs perfect! The only thing I am still unsure of is HOW MANY TURNS OUT or the range of the pilot screws??? I have a clymer manual but it does not specify. If anyone know the range please reply.

Thanks!

I'm very sorry I wasn't able to respond earlier.
Straight from the pages from my Honda Marine FM; Turn each pilot screw clockwise until it seats lightly. Then turn each pilot screw to the initial setting of 2-1/8 turns out.
Warm up the engine to operating temperature, then turn the idle stop screw to obtain specified idle speed (950+-50). At idle turn the #3 carb pilot screw 1/8 turn increments, in or out, to obtain the highest idle speed. If nessesary turn the idle stop to maintain the specified idle speed. Perform the same pilot screw adjustment on #1 and #2 carburetors.
Lightly snap the throttle several times and the otor return to idle. Turn the idle stop screw to specified idle.

A couple years ago I bought a mercury slacktube type manometer to balance my carbs. I found that once the carbs are set with care they stay put for a long time.