Honda VFR 750 RC24 '86 doesn't start after carburetors overhaul

LOL

Here’s Captain’s post

So, Captain, in your experience, what’s the right turns set for the pilot screw, since there’s a main jet of 115 (118 was the stock one)? And generally speaking, is there a way to “calculate” it? Maybe with some tuner tool or stuff

 

I know there is a language thing but no “turns” on the main jet. Just the size is the issue.


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I wrote that bad, edited the post. I meant the number of turns of the pilot screw since a smaller main jet of 115

 

Pilot screw is for idle only


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We have a fundamental lack of knowledge regarding carburetors here, and I'm not going to have a class.

I really don't expect you to have problems with 115 vs 118 in the real world. It is concerning that a "kit" supposedly made for your bike has the wrong jets. What else is could be incorrect then? Or mis-marked?

What size pilot jets did the kit provide?

I am very skeptical of your mechanical aptitude regarding rebuilding a complex set of carbs that require finesse and fine tuning. Chasing "symptoms" without any real knowledge of the quality of work performed is tiresome to say the least.

 

This may help… it’s a very old guide from DynoJet I got with a jet kit back in the 80’s…
Take a look


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I think that the main barrier here is the technical language, I’m struggling understanding the various names of the elements, but I can assure you that I’m not doing anything without knowing at least the minimum of the stuff I touch.
I need to clarify what I meant to say, I’m gonna do that as soon as I’ve got some spare time

 

You’re doing fine … we are here to help


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This diagram is helpful too

 

Oh hell yea !!!
I just downloaded it

Thank you Sir


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You'll get it. Just understand how hard it is diagnose carb work remotely.

This is a good example for anybody that is learning and perhaps tackling this for the first time. Start a thread first. Document with pictures your steps. Ask questions along the way... and give a reasonable amount of time for answers. On that subject, stick around for a bit after asking. Answers can sometimes come really fast and the poster is already gone not to return for a week. And Read Read Read. The videos you mentioned are also great and a very good start.

 

Guys it’s dead again...
I wanted to turn on the bike in order to sync the carbs but now it wouldn’t start again. Maybe I flooded but I removed the spark plugs and blew hot air with a hair dryer, still won’t start.

I tried with every combination: no choke no throttle, full choke no throttle, no choke full throttle, full both…any advice for how to start properly a flooded bike?

 

Kill switch off…
Full throttle
Crank for about 10 seconds

Always worked for me


You have a definite issue that needs to be corrected. It’s finding it that is the task at hand. Hmmm, are your floats good?


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“crank” means keep pressing the start button?
Full throttle, doesn’t it make the engine more flooded?
Anyway thanks, I’ll try

I guess so, even if I didn’t checked if they floats but at sight they hadn’t any visible damage. Maybe a little damage that could affect on the long run (indeed, after 4 days of super responsive start, now it won’t), gonna check on that too

 

Hi Elia, welcome . Have you had the bike since new?
When you study the diagram posted by @Captain 80s remember that float heigth adjustment will affect them all but the starting circuit. Also observe that for normal street bike operation the needle and needle jet and vacuum operated plungers are essential for how well the carburation works.

 

Hi, no it was my father’s bike

 

thanks

Nothing to do, still won’t starts

 

Normal starting: as described by @Captain 80s has worked for me as well. No throttle and choke depending on motor temperature.
Flooded: the procedure by @sixdog is in line with my experience. It is to be done without choke of course and serves at venting the motor to remove excess fuel and fuel fumes. After that try to start normal (kill switch in ON position, no choke, no throttle). If no immediate response: a little (1/4) throttle opening. If still no signs of life: back to troble shooting.

If the bike has been stored for some time you should discard all fuel in the tank and replace with fresh fuel. Did you do that?

 

If the plugs are wet and you have spark then it’s too much fuel getting into the cylinder. You gave a fuel overload issue… assuming your idle circuit settings are correct and clean you have to find the why you are flooding your engine. Even if your main and secondary jets are clogged or not correct the engine should start with a healthy idle circuit unless you have a float issue that allows too much fuel into the carb/cylinder.
At least that’s how I see it.


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