Frequent gunk in 1994 Honda 9.9 carb

[BandonBen]

I'm experiencing frequent orange gunk buildup in my 1994ish Honda BF9.9AM outboard. This is causing low idle issues.

For example, I cleaned the carb October 13th, then went out for about 4hrs on Oct 14th and another 5 hours November 2nd. Both trips were mainly trolling at lowest idle, and after the cleaning, the motor ran great. Yesterday, Nov 15th, the motor wouldn't idle - after inspection the carb was gunked up again.

I use 89octane pump gas.

I cleaned the carb today (ran great) then disconnected the fuel line and let the motor idle until it ran out of fuel. Finally I removed the carb drain plug and squirted a bit of carb cleaner into the fuel bowl.

Will this help? Any thoughts on how to keep the gunk from returning?

Thanks in advance!

 

[racerone]

An empty carburetor stays clean.

 

[Grub54891]

run it at wot in gear on the lake for ten minutes before retrieving the boat. They need to get cleaned out after low idle.

 

[cyclops222]

EXCESSIVLY slow in gear trolling will build up gunky deposits. IF you reduce the trolling motor speed to low ? It will run too cold of a engine condition.
Put the trolling speed where it belongs. ALL the fish can catch any trolled bait or lure. Been there and do that.

 

[racerone]

I used to troll with a 235 HP V-6 model and 2 stroke.----Never a fear of gumming up carburetors or damaging the motor.