Question about 2000 Honda CBR 600 F(4)Y

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When i start my bike it is running at a really high rpm and the choke is not pulled?

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An air leak is making the fuel/air mix lean. This makes the engine run fast. Loose clamps or loose mounting bolts as well as cracked rubber manifolds and hose fittings are the usual source. Another possibility is a throttle line out of position or stuck.

Posted on Aug 04, 2010

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Posted on Jan 02, 2017

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Rpm high after starting the engine of R15 v.2


It sounds as if a throttle cable or choke cable is either sticking or badly routed . Most bikes rev high at cold start then the revs should decrease as the engine warms up. I would check the throttle and choke cables first make sure they lubricated and operate smoothly and especially with the throttle cable if you open it slowly does it return immediately you take your hand away. It should almost snap shut. I would also check out the pilot air screw in the carb these get clogged with debris from the petrol over time. Before you take the pilot air screw out turn it clockwise into the carb and note how many turns it takes until it stops (do not over tighten this screw) be very gentle when you do this. Check your user manual to see if the turns in you found match the turns out in the manual. Also make sure the tick over (idle) adjuster screw is set correctly your bike should idle at approx 1,200 to 1,300 RPM when hot. My Yamaha 125 is 1,300 RPM my Suzy 650 about the same.

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Just bought a 1993 suzuki gsxr 750. has been sitting in a garage for 2 years. we took the carbs off and cleaned them really well, changed the oil, and air filter and we added new gas. bike starts up and...


If is runs better with full choke, then the bike is lean, check for air leaks at the carb manifold, vacumn cracked hoses, non standard exhausts, perhaps the mufflers have rusted out while sitting

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1995 Kawasaki Ninja 250 will only run with the choke on


you have blocked jets in the carbs,,the carbs need to be removed and cleaned.

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Last time I STARTED MY VSTAR 1100 I CHOKED IT FOR 10 SECONDS ON HIGH THEN MOVED TO MEDIUM CHOKE FOR 4 THEN TOOK OFF AT NO CHOKE. 2 WEEKS LATER. I started up bike Choke on high bike barely wanted to idle...


Sounds like your flooding it out with the choke out. Try the next time you go to start the bike when it's cold with the choke out and when it starts push the choke all the way in and keep it running with the throtle. If it runs better after doing this then your flooding it on start up. Use 1/2 choke to start cold and see what it does. Good Luck

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1 Answer

St1300 will not run below 2000 rpm


your bike has three different fuel delivery methods...choke , low speed or pilots in the old days, and main fuel rails or mains in the carb days. your choke or idle circuit is not working. on fuel injected bikes you have a relay which you need to get checked to see if it's a possible contributor. best to take to honda dealer and they can diagnose the problem. hope that helped a little sir.

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1 Answer

1989 cbr600 revving really high then shuting down


you need to check the choke cable to make sure it is not hung up and flooding the engine pull the cable and see if it feels free if so you might want to take the carbs off and clean check top and bottoms tops may have diaphams in them that may be wore out make sure to take choke cable out from carbs they like to hang up good luc p.s. take pictures as u go if you are unfimilar with rebuilding carbs if the choke is hanging up once you get that taken care of make sure to change your plugs they are probally fouled

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1 Answer

98 CBR F3 doesn't stay running w/o choke on


There seems to be fuel starvation to the carbs.
Check the fuel filter and the petcock, not bad too to clean the carb/s.

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1 Answer

Exaust change


colder plug for NGK. Should I stay with that plug or go with a hotter plug ? That's really ... weird. You have to use the choke ... which indicates you went lean The old exhaust needed no choke shich indicates rich... But you went back to stock which should, by normal standards, make the bike run RICHER if the jet sizes were increased,,,

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