Today a surprising discovery 1973 CB350F Keihin carb fuel rails use 4 orings per rail... precisely identical size in same application as your EX500 rail orings but...47 years ago? I found this quite interesting.
Very possible...double orings assure no leak, reliable. In view of the fact that these oldies are tricky and time consuming to fully split and service....long service life was desired and considered in design, no doubt. My pic only shows a small percentage of the multitude of attaching rack parts and throttle linkage hardware....def an old school design carbset.
I'll follow up with an "overview" pic of removed parts on the overcrowded work in process storage tray. Lotta stuff.
Renovating a badly corroded 250 ninja jet needle required polishing. Mounted my dremel (equipped with polishing pad) in plastic jaw vice. Thus allowing the use of fingers of both hands to carefully steady and hold, avoiding any distortion or bending of the needle. Worked out ok, surface smoothed, preventing expense of a new one.
Definite manufacturing variances documented between aftermarket and Keihin factory pilot screws. One ramification...copy cats will not "seat" in same manner as original. Precisely why I refuse to use junk from kits.
Sorry for scribble, but diameter differences an undeniable fact. I'll try and compare pilot jets next.
These from a 250 Ninja....common to 500 as well.
Pulled this little crab offa (reluctant to start and run) Stihl hedgeclipper today, needle & seat gooped. Corrected, starting/running like a champ. This high end clipper belonging to a pro landscaper, saved him expense of out and out replacement. Ready for pickup 2 hours after it was dropped off, very reasonable fee...requiring no parts whatsoever.
Ladies and gentlemen can you say....repeat business ?
Documented, yet another major screw up discovered in a copy cat "carb kit"...this for 250 ninja. I'll submit...an unknowing parts swapper would put these wrong diameter float valves right in. Then would proclaim (when problems immediately arise)...."but can't be float valves....they're brand new!"
Due to human packing/labeling error or QC issue?....dunno, don't care....Another perfect example of why I DO NOT USE copy cat kit crap in my service.
OEM or selected, time proven aftermarket vendor components only here.
ongoing.... various non-runners being received from the 'scape service. I'm in a learning curve on these tiny Walbro type carbs. Above and beyond simple cleaning and needed carb kit component renewal ...they employ a fuel check valve. A rubber "flapper" reacts to intake and exhaust pulses. Not normally needed, but removal/replacement requires pressing into/out of the carb main body. I'm doing my first one this morning, tantamount to microsurgery. Await new valve on order, but I want to examine, experiment with the old.
I know my microsurgery comment a bit extreme......but to put size in perspective.....an EX250/500 float valve next to a Walbro example. Working with this very tiny stuff certainly a challenge.
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