Question about Watts Onan Portable Generator - 4000 , Model# 5500

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Carb adjustment bge onan gen.

Adjusting main jet

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

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mamicheddy
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SOURCE: I have an onan 2800 gen that will not charge

If the govenor didn't work that means that you placed the linkage on the carberator the wrong way. This will cause the genset to overspeed and possibly stop the genset from creating voltage. If the genset does not create voltage then you won't have a charger. Fix the linkage first by looking to make sure that the throttle plate is closed before starting genset. Once you start the genset check for voltage.

Posted on May 12, 2009

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SOURCE: My Onan Emerald Plus Gen, 5.0 BGE-FA, will start

voltage regulator is causing surge make sure its not overheating is a heat shield missing.

Posted on May 10, 2010

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How to Adjust idle circuit? Why does it start, but does not keep running.


2 stroke or 4? if 2 stroke definitely jetted wrong choking makes it rich tells me your main jet is too lean (smaller hole) you need to pull carb check jets for plugage clean jets write down numbers check dealer for correct jet size for your elevation if 4 stroke back fire thru carb indicates timing is off or bad intake valves or cam lobe worn

Oct 03, 2016 | ATVs

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How to adjust carb settings


Hi Charlie.<br />Operations to be performed depends on how much tuning is needed.<br />Carb setting regulates the ratio between air and fuel in the mixture aspired into the cylinders.Optimal air/fuel ratio is usually around 14(air) to 1(fuel). I illustrated the complete job with cleanup and jet replacement and adjustment. In some situation you do not need to perform complete tuning, which involves taking apart the carburetor. In that case perform basic regulation setup using the two adjustment screws at one side of the carb. Adjustment simple procedure starts from part 2/Adjustment. A good approach is first doing adjustment using idle and thickener screws. Then do the whole tune up if the simple adjustment does not work.<br />The complete tuning is based on carburettor cleanup, regulation of main jet and idle jet and needle setup.<br /><br />Part 1 : Complete tuning and cleanup:<br />1. Take apart the carburettor,<br />2. Undo the float chamber(6 in diag) held by screws (26 in diag).<br />3. Clean bowl with with carb cleaner (put a lot of it in the bow, wait a bit and dispose it-finish the job with a cloth if needed) . Clean floats (nr.4) and other parts using carb cleaner and cloth.<br />4. Use a flat screwdriver to remove the main jet screw (placed in the chamber, held by big golden screw, goes between the floats). Spray the main jet. You must be able to see through it.<br />5. Use the carb cleaner to clean the accelerating pump and all the other parts inside the part. Needle and small parts must be cleaned. Clean the idle jet, which is the smaller golden screws. If you have a compressor blow into the jets (you can blow them even without compressor, but follow H&S).<br />6. If possible replace main and idle jets. Sometimes you may like to replace the jet with a bigger one to get a richer mixture.<br />7. Adjust the needle if needed. A lower needle settings means a richer mixture.<br />8. Remove idle adjustment screw (7) and main adjustment screw(31), clean them screw them back in without tightening and perform part 2. Leave the screws about one and half turn from all way in.<br /><br />Part 2: Tuning and minor cleanup - Here you mainly operate on idle and air (thickener) adjustment screws (8 and 12 in diag)- Start from here, if this does not work, do part one:<br /><br />1) If the engine runs start from idle adjustment: screw or unscrew the idle regulator to adjust the idle speed, the screw is placed to one side of the carburetor and has a spring (part 12).<br />Keep idle least slightly higher than the minimum needed. Example, if the engine stays on slightly below 1000 rpm, set idle to a bit higher with engine revving above 1000 rpm.<br /><br />2) The thickener, placed near that of the minimum screw regulates the air flow. Tighten the screw and unscrew 2 turns from all the way in. Do regulation from this position. <br /><br />Here carburetor diagram and part list. The diagram is taken from service manual. The manual for Lifan 150 (does not include carb setting) has been uploaded here:<br /><br />http://www.mediafire.com/?o3r8x2ujrdbfb6o

on Oct 29, 2011 | 2008 Lifan Delta 250 V Twin

1 Answer

Engine runs on choke but dies without?Special tool to adjust hi /lo carb settings?


Your main jet in carburetor is fouled and needs to be cleaned out. The choke circuit bypasses it but when you remove the choke the gas is supposed to go into engine via the main. If clogged, the engine will quit for lack of fuel.

Either clean the carb and jet or replace carb. And yes, newer carbs have basically non a adjustable jets which is ridiculous since each engine is unique and has to be properly matched to new carb. Way around this is by either buying the special tool (he-- with them) or using a dremel tool to cut into head of adjuster a slot so that you can use a regular flat blade screw driver to adjust.

Oct 27, 2015 | Ryobi Garden

1 Answer

ONAN GENERATOR STARTS THEN ONLY RUNS WITH CHOKE ON


Hi,
This sounds like a problem with fuel settings or dirt in the jet.
If you can find the carb adjustment screws, with it runing on full choke - screw it in fully untill it stalls, then back out to original position, then restart.
Take off choke and adjust setting untill it runs well when warm with choke fully out.
You can then try and make it run leaner without stalling.

Feb 07, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Jet adjustment where are are jet adjust screws?


There is no way to adjust the jets on these carbs, fuel metering is done by a fixed sized main jet. If you need to adjust you must replace the jets with either a larger or smaller size jet.

Dec 30, 2009 | 1985 kawasaki ZL 900 A1 Eliminator

1 Answer

8hp Tecumseh engine how to adjust carb. when I put throttle on high it sputters drop the throttle back down its okay?


These symptoms indicate a rich mixture. Assuming the carb is the original (and therefore correct) one, and that it has an adjustable main jet, turn in the main jet adjustment screw on the bottom of the float bowl until the engine runs smooth.

If there is no adjustment on the float bowl, the carb will have to be removed and properly cleaned (ultrasonic cleaner recommended).

Oct 01, 2009 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

I am rebuilding the carbs. each carb has three jets that all interchange with each other. The main jets were #70 but the manual says they should be #13.5. What I need to know is a) what jets go where?...


Both carbs have the same jets and should be the same .Now the main jet will have the biggest hole in it ,the compensator jet will have the medium size hole the other jet will be the idle jet so it will have the smallest hole .Now i havent seen one of these carbs but the main jet should be the one that has a passage that runs directly into venturi and the compensating jet should be in the same body/housing and in the base of this housing is another jet /restrictor where the petrol comes in .The mixture is only adjustable on idle by means of the air screw ,which is normally adjusted to one and a half turns out but dont overtighten it before unscrewing it ,then it can be be adjusted in or out a bit for the best evan idle ,but officially its supposed to be less than 2.0 CO2 but they do get checked on the inspection here in in spain

Aug 17, 2009 | 1996 Yamaha XV 535 Virago DX

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