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What's a good starting point for adjusting my carb jets and air intke

2001 200cc yamaha blaster bored 40 over

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My 2000 Yamaha blaster 200 runs good at half throttle but bogs after half throttle

check for air leaks around the air filter and/or clean the carb

Dec 09, 2016 | ATVs

1 Answer

Where are the air & fuel pilot jets screw

Hi Larry:
If your engine has adjustable jets they will be accessible on the outside of the carb, and can be accessed without removing the carb as you will use them to tune the engine while it is running.

Dec 07, 2015 | ATVs

1 Answer

What are the carb adjustment for a 98 Yamaha Big Bear 350cc atv this page shows the carb all pieces including air mixture pilot and main jets

Oct 07, 2014 | ATVs

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Why does my yamaha 660 only run if the choke is on? What causes it to backfire?

Most of the time it's because the Pilot/Idle jet is clogged in the carburetor. This most often happens because of old fuel sitting in the carburetor during long periods of sitting and non-use. The fuel forms a varnish - a gummy layer inside of your carburetor and clogs the tiny holes in the idle jet. Since fuel can't get through, the engine dies. The hole for the choke is larger, therefore the fuel can still get through it.

clogged carb jets Google Search

Jul 20, 2014 | Yamaha 2005 Grizzly 660 Auto 4x4

2 Answers

How to adjust mikuni carb on yamaha moto 4

idle screw on left or right. Airscrew should be near carb intake ,careful only brass, 1 1/2 turns out from full close will get you close.

Jun 02, 2014 | ATVs

1 Answer

How do u adjust the throttle and fine tune carb also how do you know that injection pump that mixes with oil is working

a lot of people that take these apart put them back together backwards. make sure it is right. most of those carbs are not adjustable other than the jet itself. make sure your fuel tank is clean and fuel lines are clear/ fuel filters are clear or new.

Aug 15, 2013 | Yamaha 2004 Blaster Base

1 Answer

Blaster stuck on full throttle

I would check the plastic heat isolator between the carb and cylinder head for leak.

Jul 07, 2013 | Yamaha 2004 Blaster Base

1 Answer

Raptor 660 starting plug, new hoses, new oil, new radiator, rebuilt water pump, rebuilt thermostat, cleaned carb, cleaned all jets, cleaned petcock, cleaned fuel filter, turns over fine,...

Hey Josh,
Cleaning a carb is a little more that most people takes someone with knowledge and training to really do one right... take it to a professional..

Jun 23, 2017 | Yamaha 2010 Raptor 90

1 Answer

I got a 95 big bear and i got a problem with a rough idle and back fires

If it's been sitting around for a while it could be the idle jet has a little craip in it (it don't take much) but if it's spitting fuel out then I would make sure the float levels aren't sticking.

Apr 04, 2017 | Yamaha 2005 Big Bear 400 4x4

1 Answer

Hey guys, I have a 03 banshee that a just had completely rebuilt. Crank, pistons, pipes, the works. When I got it back it ran great. Then we noticed it seemed to not be getting enough fuel in the power...

1. How could you tell it wasn't getting enough fuel in the "power band?"..i.e. the upper rpm range...?
A "power band" is simply the RPM range where the engine makes the most power.. it is more pronounced on modified two-cycle engines.. it is NOT something you can buy or have "installed".
Adjusting the float level only accomplishes getting more (or less) fuel in the carb bowls to make it available to the jets. >>The JETS are what (and ONLY what) gets the fuel to the engine!<<
Spark plugs are read to tell whether their is a need for a jetting change.. if you do not know how to do this - STOP tinkering with your engine-PERIOD!
You need a factory shop manual to get the necessary specifications of the ignition system,,(resistance values)...then and only then can you adequately check the wiring and related components...
What is a hot rod crank? I have built numerous banshee racing engines.. just wondering about yours.. $3000 in an engine.. it should have come with 34mm carbs, new head, ported cylinders, etc...jetted by the person that built the engine... if it didn't you need a new engine builder!!!
Do you live near North Alabama??

Mar 06, 2017 | Yamaha 2004 Banshee Base

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