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MarJay |
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MarJay But it's British!
Joined: 15 Sep 2003 Karma :
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Posted: 18:47 - 20 Mar 2011 Post subject: What could be wrong if a bike will only run on choke? |
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Hello,
I have recently spent a bit of spare time trying to sort out some of the issues on my FZR400. The other day I changed the oil, filter, spark plugs and coolant. I then tested the bike to get the coolant running through and to make sure I filled the oil to the right level. It didn't run very well, and every time I gave it some gas the engine just cut out.
I didn't worry about this too much as I had lots of other work to do on the bike, but I had it running long enough to circulate the oil and coolant. I then replaced the air filter, adjusted the exup cables and freed off the rear brake caliper which was seized.
So having done all that I decided to take the bike for a ride. I fired it up and it ran better than earlier. I could rev it with the choke on and it died with the choke off. I assumed this was because the bike was cold so I continued with my ride. Once the temperature gauge was showing a reasonable temperature, I pulled over so that I did not kill the bike by taking off the choke if there was something wrong. I took off the choke, and as I suspected, the bike died.
The bike now will not run without the choke on... It ran OK when I picked it up, but I didn't want to ride it too much in the mean time without servicing it.
Any ideas what might have happened to prevent the bike from running without the choke? ____________________ British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another. |
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Paxovasa |
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Paxovasa World Chat Champion
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Livefast123 |
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Livefast123 Nearly there...
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MarJay |
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MarJay But it's British!
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Paxovasa |
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Paxovasa World Chat Champion
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Livefast123 |
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Livefast123 Nearly there...
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Stelmer |
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Stelmer World Chat Champion
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Ichy |
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Ichy World Chat Champion
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jimspeed |
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jimspeed World Chat Champion
Joined: 05 Mar 2010 Karma :
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Posted: 22:18 - 20 Mar 2011 Post subject: |
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does it die if you are riding it when you put the choke off?
sounds like the partially blocked air filter was masking the weak fuelling problem maybe
if it rides ok with choke off then its prob just an idle adjustment or carb balancing. ____________________ Hyosung cruise 125(passed test on, sold) Kawasaki el 252 (better than expected but sold on) Kawasaki GPZ500S first "big"bike.(sold) ZZR600 E5..Z750 2007,ER5, currently on a 2008 Enfield bullet electra x and loving it..
,"Alpha-9: Is there any correlation between dyno rod and dyno kits?" |
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MarJay |
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MarJay But it's British!
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Ichy |
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Ichy World Chat Champion
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lihp |
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lihp World Chat Champion
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Frost |
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Frost World Chat Champion
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MarJay |
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MarJay But it's British!
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cb1rocket |
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cb1rocket World Chat Champion
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Frost |
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Frost World Chat Champion
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lihp |
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lihp World Chat Champion
Joined: 22 Sep 2010 Karma :
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Posted: 14:05 - 21 Mar 2011 Post subject: |
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MarJay wrote: | PhilDawson8270 wrote: | If it runs ok with choke on, but dies with no choke, then your mixture is too weak. You need to richen your mixture. |
Yeah, good work braniac! I'm aware of that
I want to know why my mixture might have leaned off. If I randomly start adjusting screws on my carbs, I might well just make things worse.
I want to know what sort of things I need to look out for, that might have changed on the bike from me doing the oil, filter, coolant and spark plugs. |
Carb jets may have become dirty, or worn.
My R6 developed running issues, and found 2 mixture screws 2 turns out, 1 was 3.5 turns out and the 4th was almost 5 turns out.
The bike had ran fine for the first 2 months after I bought it, but gradually got worse for some reason.
I'd pull the carbs, and clean and check them all then check all adjustments are correct. |
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Ichy |
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Ichy World Chat Champion
Joined: 15 Jul 2005 Karma :
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Posted: 14:25 - 21 Mar 2011 Post subject: |
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What is wrong with just reseting the idle speed?
There are a lot of assumptions that the mixture is weak, but based on what, it won't tickover without the choke? A choke richens the mixture and causes the RPM to rise.
How about this for logic. The airfilter may have caused a small restriction in the airflow. This caused the mixture to richen and the revs to rise. To compensate the previous owner adjusts the idle speed to drop the revs. New filter, no restriction, revs drop, bike doesn't tickover.
It may be way off the mark but its a 20 second adjustment. if it doesn't work then no loss and you have ruled out another thing. You'll need to adjust the idle speed to set the mixture correctly anyway. ____________________ https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/ |
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MarJay |
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MarJay But it's British!
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Ichy |
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Ichy World Chat Champion
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Posted: 14:44 - 21 Mar 2011 Post subject: |
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Ah, see now this changes things slightly. I didn't realise from the first post that the bike had problems before you changed the filter.
Personally I would go with Frosty and give the jets a good clean. Fitting an inline filter wouldn't hurt, 10-15 minutes and they cost around £2.
Any other symptoms? Which bike is it by the way? ____________________ https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/ |
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MarJay |
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MarJay But it's British!
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G |
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G The Voice of Reason
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Robby |
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Robby Dirty Old Man
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MarJay |
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MarJay But it's British!
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lihp |
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lihp World Chat Champion
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Old Thread Alert!
The last post was made 13 years, 90 days ago. Instead of replying here, would creating a new thread be more useful? |
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