Problem: I cant get my 93 CBR 600F2 to start after riding it.

After riding my bike around perfectly fine for 30 minutes or so it doesn't start if I turn it off and cut the engine for 10 minutes or more. But I will come out the next day and it will start perfectly fine and ride fine. Its not a overheating problem, the engine temperature is completely fine. Ive tried choking it and it wont start. And eventually after trying so many times the battery dies or I will come out the next morning and the battery is dead. Any thoughts?

 

Gas tank breather hose blocked ?

And potentially check the R/R (regulator rectifier ) sounds like it may not be charging

Welcome to the Forum btw !

going to move this to the F2 Section

 

fuel tank breather is a possibility like Sprock mentioned - would cause vacuum to build up in the tank can interrupt flow - especially with our vacuum operated petcocks. You could open the tank cap when it acts the way - that would eliminate the vacuum situation and should allow fuel to flow freely. Check the 2 hoses dropping off the back of the tank anyway for blockages and/or kinks.

I'm wondering if you might be experiencing a R/R issue though. Might want to walk through the testing procedure for the R/R now just to check.

 

+1 to popping the cap, to eliminate a vent clog as a possibility.

Here are some links to explore the r/r as a potential cause...

Charging System Diagnostics - Rectifier/Regulator Upgrade - Triumph Forum: Triumph Rat Motorcycle Forums

https://cbrforum.com/forum/f2-tech-9...-solved-27739/

Technical Resources - Resources for Electrical Systems on Motorcycles and ATVs - ElectroSport

Ern

 

Thanks alot. I figured the problem, and it was a breathing issue like you all suggested. The vent hose that runs straight from the engine to the gas tank was filled with gas along with the 2 left carbs. I cleared that all out. It runs alot better now and I dont have problems restarting it. But what is to prevent that from happening again?

P.S Im still working on the R/R

 

Vent hose from engine to gas tank?

there are 4 lines that run to/from the tank.

2 smaller hoses ~1/4" & 3/16" that drop down off the rear of the tank and shouldn't be connected to anything but the tank

One big hose ~3/4" that is the fuel supply from the petcock to the carbs

One smaller vacuum line ~1/4" that runs from cylinder #1 (left most if sitting on the bike) to the petcock.

The vacuum line is what manually opens the valve in the petcock that allows fuel to flow to the carbs. If that line is getting fuel sucked up into it, then it might not properly keep the petcock valve open, cutting your fuel flow. If this is what you're describing, then you might be a candidate for a petcock rebuild kit.

 

Nice call AJ. I'd have to agree, given the symptoms mentioned.

Ern