i got a believe an 85 250r carb off ebay. i was trying to hook it up today but to to avail. it seems it is missing whatever it needs to hook the throttle cable up to the top of the carb. it also didn't seem like it was 34mm. does anyone know for sure where they measure? the inside towards the airbox is about 44mm, and the side towards the engine is about 28mm on the inside. the slide is i think about 28mm in diameter, however, is 34mm tall, but this must just be a coincidence, cause when i took my blaster carb apart it is about a 1/2 inch longer than the slide on the 250r carb, but is only a 26mm carb, so that can't be it. also, a 34mm carb should not fit in the stock carb boot, but the carb i had slid right into the stock boot.
i had taken the gas tank off to make playin with the carb easier, so while i had it off i thought i would take the spark plug out and look thru the hole and see what i could see. there was a decent amount of carbon buildup on the piston, so i decided to take the head off and remove some of it. the cylinder walls were flawless as well, could still see the honing marks. but you can push the piston back and forth in the cylinder a little... is this normal?
i saw somewhere on the internet before that racers will polish the dome in their head, it is supposed to help the air/fuel flow in easier and let the exhaust gasses exit easier. makes sense, but does it work, i wondered. so i decided to try. started by scraping all the carbon off with an old wood chisel. then took sanding discs on a dremel to remove the rest of the carbon and smooth it out a little. then took a cotton polishing wheel and put polishing compound (automotive, like for your paint) and polished the heck out of it with the dremel then wiped clean. attached pic is final product.
she started strait up once all put back together, but didn't seem to want to idle. simple turn of the idle screw fixed that. i may have bumped it playin with the carb. after warm up, she felt like she was runnin a little better, and after riding for a little the powerband was hitting mad hard. seems to pull better in every gear. wish i would have polished the piston too!
i still want a bigger carb tho. anyone have any suggestions? idk if there is a certain year range of 250r carbs that you have to use or what the deal is...
i was lookin at the sparkplug in the head, what do you think would happen if i put a plug in with a longer reach? probably raise compression some, but also maybe ignite the mixture in the middle instead of at the top, resulting it higher burn speed, meaning more power with less waste. (more efficient). and what about iridium plugs? anyone ever try one? i was reading an import tuner and they did a test on some plugs. champion iridium plugs make a few more horsepower on a stock motor than regular champion copper core plugs did. but will either of these plug ideas burn a hole in my piston...
well i think thats all i've got on my brain for now. if ya get bored and actually read all that chime in and let me know what ya think.
i had taken the gas tank off to make playin with the carb easier, so while i had it off i thought i would take the spark plug out and look thru the hole and see what i could see. there was a decent amount of carbon buildup on the piston, so i decided to take the head off and remove some of it. the cylinder walls were flawless as well, could still see the honing marks. but you can push the piston back and forth in the cylinder a little... is this normal?
i saw somewhere on the internet before that racers will polish the dome in their head, it is supposed to help the air/fuel flow in easier and let the exhaust gasses exit easier. makes sense, but does it work, i wondered. so i decided to try. started by scraping all the carbon off with an old wood chisel. then took sanding discs on a dremel to remove the rest of the carbon and smooth it out a little. then took a cotton polishing wheel and put polishing compound (automotive, like for your paint) and polished the heck out of it with the dremel then wiped clean. attached pic is final product.
she started strait up once all put back together, but didn't seem to want to idle. simple turn of the idle screw fixed that. i may have bumped it playin with the carb. after warm up, she felt like she was runnin a little better, and after riding for a little the powerband was hitting mad hard. seems to pull better in every gear. wish i would have polished the piston too!
i still want a bigger carb tho. anyone have any suggestions? idk if there is a certain year range of 250r carbs that you have to use or what the deal is...
i was lookin at the sparkplug in the head, what do you think would happen if i put a plug in with a longer reach? probably raise compression some, but also maybe ignite the mixture in the middle instead of at the top, resulting it higher burn speed, meaning more power with less waste. (more efficient). and what about iridium plugs? anyone ever try one? i was reading an import tuner and they did a test on some plugs. champion iridium plugs make a few more horsepower on a stock motor than regular champion copper core plugs did. but will either of these plug ideas burn a hole in my piston...
well i think thats all i've got on my brain for now. if ya get bored and actually read all that chime in and let me know what ya think.
