Tuning a DT 250 2 cycle Mikuni carburetor
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Tuning a DT 250 2 cycle Mikuni carburetor graybeard via MotorcycleKB.com 03-23-2008
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Posted by graybeard via MotorcycleKB.com on March 23, 2008, 8:55 pm
Now that the engine starts, I need to get it running right.

The Yamaha DT 250 Enduro starts and idles o.k. and the low rpm response is
at best 'all right' . But when I crank on the throttle the bike just doesent
pull like it should. At about 3500-4000 rpm the power band flattens out...
feels like it's starving for fuel.

Does anyone have the specs for initial setting for these 2 cycle carbs? Float
setting, number of turns for idle and high speed jets. Techniques?

Another symptom is that the plug fouls quickly. If I burn off the soot on the
plug with a propane troch is starts instantly. But after just one or two runs
the plug is again so fouled it wont start. Is there an adjsustment for
richness?

Thanks,
Dave

--
Message posted via http://www.motorcyclekb.com


Posted by The Older Gentleman on March 24, 2008, 4:50 am

> Now that the engine starts, I need to get it running right.
>
> The Yamaha DT 250 Enduro starts and idles o.k. and the low rpm response is
> at best 'all right' . But when I crank on the throttle the bike just doesent
> pull like it should. At about 3500-4000 rpm the power band flattens out...
> feels like it's starving for fuel.
>
> Does anyone have the specs for initial setting for these 2 cycle carbs? Float
> setting, number of turns for idle and high speed jets. Techniques?
>
> Another symptom is that the plug fouls quickly. If I burn off the soot on the
> plug with a propane troch is starts instantly. But after just one or two runs
> the plug is again so fouled it wont start. Is there an adjsustment for
> richness?
>
This is where you spend a few bucks on a secondhand manual, to find the
correct settings.

--
BMW K1100LT Ducati 750SS Honda CB400F, SL125 & SH50
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
chateau dot murray at idnet dot com

Posted by SC Tom on March 24, 2008, 9:29 am
> Now that the engine starts, I need to get it running right.
>
> The Yamaha DT 250 Enduro starts and idles o.k. and the low rpm response
> is
> at best 'all right' . But when I crank on the throttle the bike just
> doesent
> pull like it should. At about 3500-4000 rpm the power band flattens out...
> feels like it's starving for fuel.
>
> Does anyone have the specs for initial setting for these 2 cycle carbs?
> Float
> setting, number of turns for idle and high speed jets. Techniques?
>
> Another symptom is that the plug fouls quickly. If I burn off the soot on
> the
> plug with a propane troch is starts instantly. But after just one or two
> runs
> the plug is again so fouled it wont start. Is there an adjsustment for
> richness?
>
> Thanks,
> Dave
>
> --
> Message posted via http://www.motorcyclekb.com
>


You are not really going to get the expert help you need here. These guys
mean well however most don't have a clue on how these old Yamaha Enduros
work.

For the best help, join us over at www.yamahaenduro.com

Tom


Posted by The Older Gentleman on March 24, 2008, 9:38 am

>
> You are not really going to get the expert help you need here. These guys
> mean well however most don't have a clue on how these old Yamaha Enduros
> work.

You man, like this old guy who recommended checking the spark plug first
and the coil/HT lead second, and who scored a bullseye?


--
BMW K1100LT Ducati 750SS Honda CB400F, SL125 & SH50
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
chateau dot murray at idnet dot com

Posted by SC Tom on March 24, 2008, 7:49 pm
>
>>
>> You are not really going to get the expert help you need here. These guys
>> mean well however most don't have a clue on how these old Yamaha Enduros
>> work.
>
> You man, like this old guy who recommended checking the spark plug first
> and the coil/HT lead second, and who scored a bullseye?
>
>
> --
> BMW K1100LT Ducati 750SS Honda CB400F, SL125 & SH50
> GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
> BOF#30 WUSS#5 The bells, the bells.....
> chateau dot murray at idnet dot com


Who is "You man"?

I see you still think your the knowledge base of all things motorcycles.

If the person posting really wants to get his bike running right and learn
how to do it with the least amount of mistakes, he should ask those who work
on these bikes every day.

Also please keep the name calling to a minimum, there are children visiting
here.

Tom


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