Hello all, New to the site and excited to converse with you all on different topics for the love of our Honda 750s. Question: I recently acquired a 1976 750 F Super Sport in great shape. My bike starts and runs, but isn't happy with idling. When I start it, the 1-2-&4 cylinders all get hot, but #3 isn't as hot as the others. Before I take the carb off and clean them all out, I was wondering what your takes are on Sea Foam in the gas tank or spraying directly into the carbs while running. I have watched many YouTube vids on this, and some say drain almost all of the gas out of the tank after getting the bike hot, then add Sea Foam and run it till it starts to smoke white, then shut it off and let it sit overnight and start the next day. Some say add the whole bottle, and others say just a couple of OZ. Then one guy said to drain the bowls of fuel and add Sea Foam to the carbs like that, and let it sit. Others say to remove the air box, start the bike, and spray into the intakes while running. Wondering if any of you have tried Sea Foam, and let me know your thoughts. The majority say it clears up the problems and makes the bike run better. I'm thinking #3 carb's idling jet is clogged somewhat. Would love to hear all of your thoughts on this before I have to tear into this. I stopped at my local bike shop that has done work on some of my other bikes, and the guy there told me to clean the carbs and sync them, which is about 7 hours of work, and they would charge me $800 to $1000 for that. Sorry, THAT AIN'T happening.... Thanks to all for looking for your answers. From the DAWG in The Show Me State of Missouri.
SeaFoam question
- Thread starter DAWG
- Start date
You could buy an industrial size ultrasonic cleaner for that price and start a new business!!
Loki
Loki
Rat Rice
CB750 Member
I don't know about doing all of that with Sea Foam but you can try it. I'm a big fan of removing the carbs from the bike and disassembleing one carb at a time and spraying all of the non removable (idle jets) jets and removing the main jets and spraying them with carb cleaner. I believe those are CV carbs so be careful when disassembleing the diaphragm and needle. Remember to carb spray all orifices. Use lower pressure compressed air to blow through all of the orifices. If you don't have access to an air compressor, canned air for computer keyboards works pretty well. Take your time and clean all of the internals well.
Does it run good otherwise and how does it run on choke ? Sounds like you could have a blocked pilot jet/mixture circuit on no.3 . The seafoam sounds like it may work , but if the bike has sat with fuel in the bowls for too long , you may have to strip and fully clean it . Just remeber that unless the previous owner has changed them , all of the screws are JIS not phillips and you will strip them otherwise , get the right tools . It isnt hard , loosen the aircleaner and remove the bottom ( two bolts ) , then top ( another two bolts , 4 JIS screws ) Then loosen the throttle/choke cables and remove ( ten millimetre nuts and one JIS screw ) , loosen and remove the carbs ( four JIS screws ) . It can be done very quickly and like loki said , buy yourself an ultrasonic cleaner ( big one ) . When I first got my F2 I just used brakeclean , a tooth brush and compressed air to do mine . They were pretty clean already , but not fully , I have seen pics of the nightmare that your fuel can do , so I hope it works out
cmg
CB750 Enthusiast
Pilot jet, bad lead on 2,3 coil, sticky float
cmg
CB750 Enthusiast
Bad plug?
