Question about 1987 Yamaha FZR 250

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Fzr 250 Wont rev when cold

Only starts and idles when throttle is open, won't rev until it gets warm but once it revs it's fine.

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  • troyhayward Jan 31, 2010

    Thanks for that but would the mechanisms be sticky from not being used for over 12 months? Sounds like it's sticking when it's cold then when it warms up everything releases?

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  • 90 Answers

Hi!!
Firstly clean the air filter.
and then the carb too needs cleaning.
You can use a good fuel addative to clean the carbs.
There is a YESI a tube that runs upwards from after the carbarator ... if there is any kind of leak in this you will need to change it immediately..
An advice...Pls dont ty to fix any leak on this using any type of solution, it ALWAYS backfires....
Regards
Berry

Regards
Berry

Posted on Jan 31, 2010

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https://netrider.net.au/threads/looking-for-a-fzx250-zeal-service-manual.102959
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Hi, my zzr 250 hadn't been started for about 8 months, so it fired up nicely with the choke on but once the bike warmed up I couldn't get it to idle once the choke was off, i tried more air to the carby...


Could be one of two things
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2. The throttle cable is sticky. Less likely, but possible. Make sure it opens and snaps shut easily.
What do you mean when you say you tried more air?

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Need to know then factory settings for the carburetor on a 78 it 250 e...how many turns out for the idle and how many turns out for the air/fuel mix?


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Personal preference really, without a tacho fitted, I set it so she idles easy when cold. Once she's warm, idling is generally not used!!

To balance the two, warm engine and hold throttle at your optimum idle speed. Screw in idle adjuster until it engages base edge of carby slide. Release throttle and screw in/out fractionally to test if revs rise/fall. Set at optimum and then turn air mixture screw in/out till revs are highest (without using throttle). Then reset Idle screw back out to bring revs down to optimum level.

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