Question about Yamaha Mountain Max 600 Smart Carb Assembly 36mm / Mikuni Flat Slide & Tps

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Has a missfire

Gos really good then boggs out and starts to missfire

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Tune carb time, check fuel filter, bad gas.

Posted on Mar 13, 2014


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2006 Pt Crusier P068a code is all im getting with key dance.. dont know what that means but my battery light is on and car boggs down when i give it gas. thinking catyalic converter?? any help please

Hi,maybe the best place to start is the alternater,if the red light is on and when you try to rev up the engine it gos to die,one other check is to put a multymetre on the battery it should be around 12v but when you rev up the engine it should go to about 14v,so try reving if it stays the same or gose lower the could be alternater.
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Searching for youtube p0303 censor for chevrotel astro

that code is not a sensor code that is a missfire code , you have a miss fire in cylinder number 3 , check you spark plugs or coil for that cylinder , with that code car will run rough ( shaking ) and some time the car wont even start in small engine . let me know hosw it gos

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I have changed and done everything and can't figure out why i'm missfiring then it boggs down and dies,but when i just turn on the car it runs like a champ till it warms up of course

Could be a vacuum leak at the throttle body or intake manifold. Check torque specs for both then check vacuum hosing for cracks or loose connections.

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1 Answer

When riding my bike is missfireing and boggs out

First thing put a new spark plug in and see if that improves how it runs. then if it dosent improve i would look at your carb next, also look at what your spark plug looks like should be brown not black or gray.

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My 1995 Toyota Tacoma 4 cylinder 2.7 liter automatic 4wd is missfireing on three of the four cylinders. The miss fire is very random happening more and more frequently. I have good compression and timing....

Pull codes from OBD computer go from there. Could be other problems, check fuel pressure, All electrical connectors- loose, water, dirty, ground connections, etc. Could be a failing sensor. How do you know its missfiring on 3-4? one or two cylinders would be a really bad shake. Creek is to deep stay out of creek. Good luck!

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this sound like a crab deal for sure. when you cleaned the carbs did you take out the main and needle jets.if so carb cleaner my not work you will have to blow these jets out with with high pressure air and make sure you do all for carbs.

let me know how it gos

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Oil presser

The oil pressure should go down after the engine heats up because of its viscosity. When you accelerate the pressure should go up and at idlen the pressure goes down. 20-40 psi range is normal.

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