You are here:

Motorcycle Repair/Bike shuts down when I come to stop when its heated up


I have a 2002 honda cbr600 F4I. Whenever my bike is wormed up like when the heat is around 170 it sometime shut down by itlsef when I come to a complete stop, however, it starts and rides good. Which part should I replace that is cause this problem? I think its a pressuer problem. Yeah and whenever it dies I have to gas up while starting it.

Hello Moe,

You are quite right. It sounds like a fuel pressure problem, overpressure in particular.

I would start from the vacuum hose that goes to the fuel pressure regulator. Most probably, it's cut or punctured, thus the pressure doesn't drop when you back-off the throttle, leading to over-rich mixture and misfire.

It could also be the fuel return hose is somehow twisted or pinched, but in that case the mixture would be rich all the time and not only when decelerating.

Check the above for starters and get back to me with results. I also need to know what's your idle speed.

Best Regards,

Motorcycle Repair

All Answers

Answers by Expert:

Ask Experts


Lazaros Ampatzidis


I can help you on EVERY issue involving POST-1980 Japanese Motorcycles plus KTM and Husaberg. My field of expertise includes Engine, Transmission, Fuel system (carburation & EFI),Electrics and Electronics. Maintenance, repair and tuning. Road and off-road suspension tuning. Please don't ask me about non-Japanese Motorcycle, especially American built on which I have low to zero experience.


I'm a rider and hobbyist since childhood. 25 years motorcycle workshop mechanic.15 years motorcycle racing mechanic. In order of experience high to low:Kawasaki,Suzuki,Honda,Yamaha,KTM,Husaberg.

Hellenic (Greek) Technical School.Internal Combustion Engines Engineer. Automotive Electronics.

©2017 All rights reserved.