Topic: first time carb cleaning issues. CB750 73

[Stev-o]

After derusting, you could coat with 2 stoke oil if you do not plan to use.  Or yes, fill with fuel, and keep it topped off as much as possible. 

[736cc]

An ounce or 2 of Startron mixed in a full tank will keep your fuel systems happy all winter. Equal amounts of 2 stroke oil added insurance against rust

[RSchaefer]

Interesting question and many have differing opinions.  I think in general the opinion would be to do a tank liner (coating, i.e Dragons Blood) after electrolysis/etc. as you will have removed the factory protective layer on the steel.  Others would recommend immediately coating the inside of the tank after electrolysis with 2-cycle oil to prevent almost immediate rust.

I'm thinking that if you had rust and had to remove with electrolysis, etc. then you should be considering a tank liner.

[Jinsonphoto]

Okay, I know that this thread is old, but I finally have gotten the carbs cleaned and put back on the bike & new fuel in the cleaned tank, everything is as it should be I think. So I tried to start it up for the first time and I can't get it to start? It seems like fuel is not getting to the back side number four carb? That fuel line coming from 1&2 to 3&4 has no fuel at it and when I tried to drain the the #4 carb there is no fuel in it? Any ideas what the problem could be?

I haven't had a chance to check the spark plugs but I just replaced them before I did this carb cleaning.

Any thoughts or advice would be greatly appreciated. Thank you in advance your time!

[andy750]

Option #1
Assuming you have fuel going to the other carbs then Id say its likely the float valve sticking and not letting the fuel through. Pop off the bowl and press the float up...fuel will hopefully come out - this indicates your float valve is sticking.

If so remove float pin, remove float, catch float valve as it drops...use a Q-tip to clean out the hole and then reinstall in reverse order...should be good to go.

Option 2: no fuel getting into the fuel line suggest you have a blockage coming from the tank - unscrew the fuel petcock bowl and inspect the filter, clean if necessary and reinstall. Check fuel flow with fuel lines off the tank.

Good luck
Andy

[Jinsonphoto]

Andy -
Well I had already tried most of option #1 although I didnt remove the float. No fuel came out when I press the float up. I suspect fuel never made it that far. After doing some research I think that i have found that the lines all have to be going down hill. I also found out that there are holes are two holes in the stay plate that i can run my fuel lines through. So Im going to shorten the lines so they are going downhill & through the stay plates. I will also inspect the petcock.

Hopefully that will get fuel into the carbs so she can start up!

[andy750]

Good luck and let us know how it works out!

Andy