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Thread: Hello from the UK and 250 RS Big Red advice please!

  1. #1
    Join Date
    Nov 2021
    Location
    United Kingdom
    --
    3

    Hello from the UK and 250 RS Big Red advice please!

    Hello everyone!

    I have a 1985 (I think) 250ES Big Red that has been in the family since pretty much new. It's been stored outside a number of years, so last year I took it back to my place and give it a major birthday.

    Previously it has only run with half choke, as the carb was in major need of cleaning. I cleaned it in the ultrasonic etc, and when back together it ran perfectly. Had it idling for ages, set the mixture. All perfect. Dropped it back to my parents place, reversing off the trailer it went really rich, like the float was stuck. Since then I have had the carb on and off, and cleaned more times than I care to remember! Last time I even added a blob of JB weld on the float, to adjust the height. Still the same. Start it up. Get a minute of perfect running. Then it will barely run and throws masses of fuel in.

    Any ideas? I'm getting desparate!

    Thanks in advance.
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  2. #2
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    Is it leaking out the overflow when this happens ?
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  3. #3
    Join Date
    Nov 2021
    Location
    United Kingdom
    --
    3
    Quote Originally Posted by shortline10 View Post
    Is it leaking out the overflow when this happens ?
    Not that I have noticed, no.

  4. #4
    Join Date
    Nov 2021
    Location
    United Kingdom
    --
    3
    Quote Originally Posted by shortline10 View Post
    Is it leaking out the overflow when this happens ?
    Not that I have noticed, no.

  5. #5
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    In your few cleanings make sure you didn’t loose the needle seat which is part number 2 just above part number 19 .
    I cant tell you how many carburetors I’ve taken apart and this was either missing or installed up side down . It will fall out unnoticeably while cleaning .

    https://www.partzilla.com/catalog/ho...red/carburetor
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  6. #6
    Join Date
    Feb 2016
    Location
    Stellenbosch, South Africa
    --
    179
    Wow can't believe it, I have tried and tried to get the actual seat out of sooo many carbs and could never get it out (I work on outboards mostly)

    Quote Originally Posted by shortline10 View Post
    In your few cleanings make sure you didn’t loose the needle seat which is part number 2 just above part number 19 .
    I cant tell you how many carburetors I’ve taken apart and this was either missing or installed up side down . It will fall out unnoticeably while cleaning .

    https://www.partzilla.com/catalog/ho...red/carburetor
    1983 Honda ATC250R
    1983 Honda ATC200E BIG RED (sold)
    1984 Honda ATC200X (sold)
    1985 Honda ATC250ES BIG RED
    1985 Honda ATC70 x 2
    2001 Honda TRX90
    2004 Honda TRX300EX (sold)
    2008 Honda TRX250TM
    1976 Suzuki RV90M (sold)
    1967 Vespa Primavera 125
    1958 Massey Ferguson 35

  7. #7
    Join Date
    Feb 2016
    Location
    Stellenbosch, South Africa
    --
    179
    I believe that is the 86 model, personally I would buy a carb kit and download the manual and setup the carb 100% to spec from the manual, from there onwards you can troubleshoot should the problem persist, but you will most likely find it is a small simple thing like the needle tip that is damaged or one of the jets still being dirty.

    Quote Originally Posted by BigRedUK View Post
    Hello everyone!

    I have a 1985 (I think) 250ES Big Red that has been in the family since pretty much new. It's been stored outside a number of years, so last year I took it back to my place and give it a major birthday.

    Previously it has only run with half choke, as the carb was in major need of cleaning. I cleaned it in the ultrasonic etc, and when back together it ran perfectly. Had it idling for ages, set the mixture. All perfect. Dropped it back to my parents place, reversing off the trailer it went really rich, like the float was stuck. Since then I have had the carb on and off, and cleaned more times than I care to remember! Last time I even added a blob of JB weld on the float, to adjust the height. Still the same. Start it up. Get a minute of perfect running. Then it will barely run and throws masses of fuel in.

    Any ideas? I'm getting desparate!

    Thanks in advance.
    1983 Honda ATC250R
    1983 Honda ATC200E BIG RED (sold)
    1984 Honda ATC200X (sold)
    1985 Honda ATC250ES BIG RED
    1985 Honda ATC70 x 2
    2001 Honda TRX90
    2004 Honda TRX300EX (sold)
    2008 Honda TRX250TM
    1976 Suzuki RV90M (sold)
    1967 Vespa Primavera 125
    1958 Massey Ferguson 35

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