Question about 1993 Honda CBR 1000 F

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Hard to Start Bike

I have a 1993 CBR 1000 with about 60,000 miles on it.
In the last 6 months, it has become harder and harder to start when the motor is cold. Battery and starter seem ok. Once it starts, it runs good.
Since this started happening my gas mileage has gotten worse as time goes by. Now it does't want to start at all. It cranks like it wants to start, but doesn't. I can smell gas from pumping the throttle so much.

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  • Albert Balderas
    Albert Balderas Feb 20, 2009

    To GPMoto:

    What you suggest has already been checked and all was well. I even had him go thru the carbs. I am thinking that it might be the spark box behind rear cowel, but I do not know how to check it. I have checked all the leads going into the spark box and it all tested ok with a multi meter tester. Now realize that this problem started little by little and then progressed to this.

    Thanks



    To Flapa:

    The spark plugs have already been replaced with medium heat range plugs. At first, I thought that might be the problem, but it wasn't.

    Thanks

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Need to start w/ a tune -up and diagnostic to start eliminating potential causes. 1st take off tank, & remove plugs and do compression test. should have 149-206 psi in each cylinder, have throttle wide open as you crank motor for test.next take valve cover off and check valve tappet clearance,intakes .003"-.005",exhausts.006-.008,adjust as needed by reshimming to specs.reinstall valve cover w/ new gasket.replace spark plugs w/ new ngk dpr9ea-9 plugs w/ gap set at .031"-.035" next check air cleaner & box clean or replace as necessary. make sure fuel is fresh and that you have fuel to all carbs by opening fuel drain screw at bottom of bowls to check for fuel in bowls.make sure all spark plugs are firing also by connecting to cap & cranking motor as you hold plug to ground on motor or frame, one at atime, to avoid potentially harming cdi box always have plug grounded to bike when cranking motor. if all this checks out ok or is brought back to specs.,and still running bad or wont start, carb. set should be taken off & inspected,cleaned,repaired as needed, reinstalled on bike, and synchronized w/ vacuum guage set.

Posted on Feb 20, 2009

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Hello.

Sparkplugs. That will fix it.

You can choose between 3 types the normal the cold and the hot (performance) sparkplugs. The normal for medium temperatures is the best, the cold is suited for bellow 5º C temps. And the hot is for hot weather and performance usage.

Hope that helps.





Posted on Feb 20, 2009

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