Gentlemen,

I need some guidance... I have 1995 CBR900RR that I've had since new. It has always started with the choke immediately, until now. After letting the bike sit, I had the stealership clean the carbs, got the bike back, and it ran great. That was last summer. Now the bike is extremely hard to start when cold, almost impossible! Once warmed up though, it starts great and runs great.

Here's what I have done to try and fix the problem...

(1) Drained out gas and filled the tank this week with 93 octane, non-ethanol.
(2) Replaced the plugs with new.
(3) Verified the fuel pump works correctly.
(4) Replaced the choke cable with a new one.
(5) Verified the carbs are seated correctly and there are no obstructions in the pipe or air intake.
(6) Replaced the battery with new and keep a battery tender on it to maintain a charge with all this starter action.

What would make it act this way? I think it must be carb or gas related. Please advise what my next steps should be to get her back to her old self...

Thanks in advance for any advice offered....

 

Well do a compression check.if u got cylinders with little or no compression then it may be u valves needing to be shimmed

 

My cbr600 needed the intake valves shimmed. If they are wide open u wont make compression. The engine wont pull gas cause it cant make a vacuum. When i got my cbr i had to jump start for about 20 minutes on my mom accord. Got the valves shimmed and compression went from 45 0 0 125 to 210 215 212 217. Bike first right up now

 

Hi. My CBR 600 starts as soon as I press the starter button as long as the battery is fully charged. If your starter is turning over but the engine is not starting it would seem as though the battery isn't fully charged even though you have the battery tender on it. Check the battery voltage just before you try to start the engine. It should be no less than 12.5 volts to have a chance of a first time start. I had to use my jump start machine that also serves as a compressor to start my bike the other day and it had only been stood for three days, but it was quite cold on the day. Once you get the bike started check the voltage as you rev the engine over 3500 rpm. It should rise to 13.5/14.2 volts if the charging system is ok.