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My CRF230F starts ok but when I get into higher revs in first and second it bogs out. I thought it was the gas but I changed that and still the same thing, I also found the battery had lost it's charge, I charged it and still bogs out especially in first and second, could it be the alternator ?
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Make sure you have a good flow of fuel from the tank. If that’s ok check the float height in the carb. Also check the plug colour if it’s black oh has either too much fuel or not enough air. If it’s white it has too much air and not enough fuel.
check the fuel filter and pump flow for starters. Check for cat converter problems. Check coils are ok as they will allow idle but fail at revs.. Check the o2 sensors are clean and check the MAF/MAP sensors are clean also.
Ok I have r Royobi Tiller (30CC Gas) And last year it ran fine after rebuilding the Carb. This year it was "hard starts" Idles fine, (Tiny whisps of blue smoke in exhaust with correct ratio) Even seems to run better with the choke "on" but still...at idle only. as soon as I touch the throttle...its bogs down in tune with how much gas I give it. Little throttle? Little bog down, Little more throttle? Almost stalls, a normal throttle rev? it stalls dead! Then starts right back up again in 1 pull and idles fine again!? WTF? So after cleaning a clean carb again, (twice) and seeing no change I thought I'd go look at the original diaphragm and compare it with the rebuild kit diaphragm (which is the one in the carb.) And guess what? The replacement has a larger rivet by a factor of "2". So basically it was flooding the carb, I bent the needle tang down, better but no cigar. But I could rev it half way now. A second disassemble to bend it yet a bit further and Vrooom vroom vrooom ****! So check your needle valve even though you think its 100%. (Especially if you rebuilt the carb with a kit!)
This sounds like water condensation. Drain the carbs and a cup of gas from the tank and see if that solves the problem. If no joy, check the filter screen (inside the gas tank) mounted on the gas valve. A plugged screen may not let the gas flow freely to keep up at higher speeds. If still no joy, clean the carbs.
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