any suggestions for carb problem

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jim orndorff - 12 Apr 2008 00:41 GMT

1981 Yamaha DT100H
gas pouring outta carb. replaced the needle valve assembly. float has no
gas in it. with float chamber body off i can press upward on the float and
the flow stops. so i tried bending the flap on the float that contacts the
needle valve. still leaks. ??????? thanks in advance.
jim

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someone@some.domain - 12 Apr 2008 01:17 GMT

>1981 Yamaha DT100H
>gas pouring outta carb. replaced the needle valve assembly. float has no
>gas in it. with float chamber body off i can press upward on the float and
>the flow stops. so i tried bending the flap on the float that contacts the
>needle valve. still leaks. ??????? thanks in advance.
>jim

did you check to see if it matched factory specs for adjustment?
sorry for being captain obvious, but.

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jim orndorff - 12 Apr 2008 02:06 GMT

>>1981 Yamaha DT100H
>>gas pouring outta carb. replaced the needle valve assembly. float has no
[quoted text clipped - 5 lines]
> did you check to see if it matched factory specs for adjustment?
> sorry for being captain obvious, but.

it came on the bike from the factory. was working fine. just been sitting up
for years.

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someone@some.domain - 12 Apr 2008 03:23 GMT

>>>1981 Yamaha DT100H
>>>gas pouring outta carb. replaced the needle valve assembly. float has no
[quoted text clipped - 8 lines]
>it came on the bike from the factory. was working fine. just been sitting up
>for years.

ok, but after taking the carb apart and making sure it's squeaky clean, reset
it.
the gas we've gotten in the past 20 odd years is sh.t and turns to crap in as
little as a month. so clean the carb. if it's been sitting for more than a
couple of years, i would get a rebuild kit.
at the same tims, to save future problems, clean the petcock and check inside
the tank.
water in gas=RUST.

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jim orndorff - 12 Apr 2008 20:48 GMT

>>>>1981 Yamaha DT100H
>>>>gas pouring outta carb. replaced the needle valve assembly. float has
[quoted text clipped - 24 lines]
> the tank.
> water in gas=RUST.

thanks. done all of the above except rebuild kit. been looking for a
complete carb (new or rebuilt) on the net with no luck. actually, i had carb
"professionally" cleaned and i cleaned and refinished the tank. appreciate
the input.
jim

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someone@some.domain - 12 Apr 2008 21:12 GMT

>>>>>1981 Yamaha DT100H
>>>>>gas pouring outta carb. replaced the needle valve assembly. float has
[quoted text clipped - 29 lines]
>the input.
>jim

you shouldn't need to eplace the carb. unless it's cracked or in someway
damaged, you should be able to fix it. did the pro rebuild it?
try the rebuild kit first.
and share the results, ok jim?

>http://thumperpage.com/

the guys there are smart, so ask them for help, too.

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jim orndorff - 14 Apr 2008 18:25 GMT

>>>>>>1981 Yamaha DT100H
>>>>>>gas pouring outta carb. replaced the needle valve assembly. float
[quoted text clipped - 43 lines]
>
> the guys there are smart, so ask them for help, too.

any idea where to buy a "rebuild kit" i've put a new pilot jet, nozzle valve
assembly, and have a new float on the way. if i hafta keep buying individaul
parts at the price i'm paying, i could buy a complete carb, that is if i
could find one. i looked at the thumper page. 4 stroke. mine's a 2
jim

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someone@some.domain - 14 Apr 2008 19:07 GMT

>>>>>>>1981 Yamaha DT100H
>>>>>>>gas pouring outta carb. replaced the needle valve assembly. float
[quoted text clipped - 49 lines]
>could find one. i looked at the thumper page. 4 stroke. mine's a 2
>jim

did you ask in the message forum? plenty of 2 stroke owners.
look in a newstand copy of walneck's classic cycle trader for 100's of
dealers.

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Motorcycle Forum / General / Yamaha / April 2008

any suggestions for carb problem