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Moped Riders Association • View topic - Jetting a Mikuni carb.

Jetting a Mikuni carb.

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Jetting a Mikuni carb.

Postby Ray Casci » Tue Apr 28, 2009 12:20 pm

Hi, I have a scooter with a Franco Morini engine. the brand runs a mikuni carb. the carb is a jet to fat and fourstrokes on the upper end. Has someone jetted a makuni? and is it as easy as a Delorto sha. ? Where is the main jet located and is it easy to change?
Thanks, Ray
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re: Jetting a Mikuni carb.

Postby JD » Tue Apr 28, 2009 2:59 pm

Have you checked to make sure that your air intake isn't blocked before you start messing with the jet? Unless your engine is customized, it would surprise me to find that it is overjetted.
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re: Jetting a Mikuni carb.

Postby oilyhans » Wed Apr 29, 2009 11:40 am

most of you guys have done this ,but this is for those of you that need a pointer...

jetting is easy on the Mikuni
you will need to remove the carb
put a golf tee in the gas line to keep fuel from
draining from the lines & filter
then drain gas out of the carb
on the bottom of the carb is the fuel bowl it is held on
by 4 screws remove them
then you will see a large brass screw with a hole in it
that is the main jet
remove and replace

oilyhans
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re: Jetting a Mikuni carb.

Postby Ray Casci » Wed Jun 03, 2009 9:22 am

Hi, it's Ray.
If you can change a jet on a delorto Like tomos uses, then you can change one ina smaller Minuki. They basicly place the main jet in the same place on both carbs. just remove bowl and the brass jet is looking at you. Ray........
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re: Jetting a Mikuni carb.

Postby xrongor » Sat Jun 06, 2009 10:46 pm

the manual for the QT50 in the repair section of this site has an exploded diagram of a typical mikuni carb in it as well.

randy
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