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I have a 1990 suzuki katana 750. bought the bike non-running. it came w 2 sets of carbs. one set has 127.5 jets and fixed needles. with #'s 5ez62. the other set has the correct 105 jets. but has totally different needles (no #'s), which have the clip and
slots to move up and down. which needles should i use?
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Rather the opposite, the engine is not getting hot enough to burn off the carbon deposits. If all plugs are fouling it is probably not enough air in the mix 1st check your air filter is clean 2nd check air screw settings are 1-5/8 turns out 3rd check that main jets are 105s
Hope this helps(if so please mark as very useful) Ride Safe Bike-Doc
there in no factory setting for vacuum at the intakes, you just need them all to be level with each other so that the carbs are balanced. you need to read all at the same time while the bike is idling, adjustment to one can effect the others.
When you are on the bike and riding do you still have the choke out? And stop spraying starter fluid into the carbs..bad bad bad.... bikes start with out that stuff and if you need it then something is wrong.. your gonna mess something up doing that....let me know about the choke and we will go from [email protected]
Possible solution: Cleaning the main jets in the carbs. They are separate from the idle jets and would explain what you are seeing. Dis-assembly of the carburetors most likely required. Although I had a bike that you could access the main jets for inspection and cleaning by removing a large threaded plug from the bottom of each carb. Second way without removing the carbs is to remove just the bowls with a short or specialized screwdriver (and a lot of patience). I'm sure no shop would recommend this however.
Change the fuel filter,clean the carb jets again,and replace the air filter.This should take care of it but sometimes when they sit for awhile,you will need to clean the carbs numerous time as the gunk in the tank continues to wash down into the carbs.
Idle issues can be fuel/air (mixture ratio) or igition (spark strength). It sounds like an air restriction issue. If there is no blockage throught the air inake/filter, make sure you adjust the jets to specifications and make sure there are no float issues with the carbs.
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