How do i service a ryobi generator 5.5 kva

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Easy way is to phone their Service Department.

https://www.google.com/search?q=kde+kipor+6700ta+dip+switch+settings

Kipor KDE6700TA Diesel Generator - 5,5 kVA

https://www.kipor-power.eu > Diesel Generators

Strong power. All diesel generator sets are equipped with KIPOR four-stroke engines, also the Kipor KDE6700TA Diesel Generator. · Advanced alternator winding.

KDE 6700TA - Diesel Generator »

https://www.kiporuk.co.uk > kde-6700ta-400-64-67

A new AVR(Automatic Voltage Regulator)delivers non-fluctuating power. Powerful KM186FAGET diesel engine. Optional electric starter.

Oil in the air filter is because the engine has been tipped up, sump oil can travel up the engine breather and into the air filter box, check the oil level, if ok leave the filter off, remove the spark plug and clean, crank the engine a few times until there is no oil being ejected from the plug hole, refit the plug, leave the filter off, now attempt to start the engine, beware if it does start it will smoke until all oil has be purged from the system.

A 5.5 KW draw needs a 5,500 kva generator. Think in thousands.

your number 4045tf258 should be a industrial generator that number is the model number
John Deere 85 KVA 4045TF258 for sale Price 7 359 Year 2005 Used John Deere... notify john deere and use the model and serial number [i have 2 different numbers and are as follows RE506178 Oil Filter 1 RE5 9754;the first should be the new number and the other was the old ] just to make sure of the correct parts number for your unit

a set of what
you have to post again with more details

Check from top to the bottom.check oil filter if seals.

the unit has gone into over load
The total power requirement has exceed the output of the generator
for example if the generator is a 2.500 kw or kva then it will generate well at 1.8 kva or kw but it will not run forever at 2.5 kva -kw
When a ac is running the power requirement will be constant on the generator and with the fridge as well then the load will be at the maximum out put of the unit.
when the fridge starts again the extra load will exceed the max out put of the generator and it will slow down ( lights dimming ) and eventually go into overload mode
have an accredited electrician calculate your maximum load requirement for an external power supply and then get a unit that is at least 15.. kva kw better that required
generally fridges use 1000watts , ac conditions will draw over 3000watts and any thing else adds up . I am guessing that your generator is only 2500 unit

Carburetor bowl probably dirty and you need to change the fuel and check the spark plugs

Regular maintenance for generator is necessary that can help prolong the service life of the generator.

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Replace the oil filter after draining the old oil, and" BEFORE "adding new fresh oil, otherwise you'll be dump all that fresh oil, on the ground,while you "TRY to get the new filter installed.

Step 1 Remove drain plug,Drain oil into drain pan
Step 2 Remove oil filter
Step 3 Reinstall drain plug,qnce oil has drained.
Step 4 Fill new filter with oil,lube seal on filter.
Step 5 Install new filter, Add fresh oil to proper level.replace filler cap
Step 6 Run engine check for leaks.
Happy motoring!