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Post by yamanastic on May 26, 2013 14:04:08 GMT 1
Do you know if the the float height is too low or too high, what does it do to the running of the bike?
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Post by steven on May 26, 2013 15:31:41 GMT 1
Hi, Too low a float height causes lean running...  Too high a float height causes rich running. These findings are not from experience, its just what I read when I was setting mine. steven. |
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Post by yamanastic on May 26, 2013 22:57:08 GMT 1
Okay Steven thanks for the info
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Post by muttsnuts on May 26, 2013 23:19:50 GMT 1
if the float height is too low then you will find at higher sustained rev's that the bike will just die on you, it will make you think it is seizing or the likes (its just run out of fuel), if the float height is too high then you will most likely get overflowing of fuel - so it will piss fuel all over the floor, or if its not overly bad, it can under certain conditions cause surging when coming off the throttle as the engine can draw the fuel into the engine due to the height of it being too high.
HTH
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db8888
Thrash Merchant
Posts: 329
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Post by db8888 on May 27, 2013 17:50:16 GMT 1
if the float height is too low then you will find at higher sustained rev's that the bike will just die on you, it will make you think it is seizing or the likes (its just run out of fuel), if the float height is too high then you will most likely get overflowing of fuel - so it will piss fuel all over the floor, or if its not overly bad, it can under certain conditions cause surging when coming off the throttle as the engine can draw the fuel into the engine due to the height of it being too high. HTH I think you have your float heights confussed with fuel levels a low float height will give a richer mixture .... |
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db8888
Thrash Merchant
Posts: 329
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Post by db8888 on May 27, 2013 17:59:16 GMT 1
The float height is the most important setting on a carb you have to get this right first before you can set any jet sizes . the float height can effect the fuelling across the entire rev range.......... also on the rd being a 2 smoke the vibes from the motor can increase the fuel level with vibration if the needle valve is worn they don't just wear on the seats they also wear on the sides the alloy bit this can cause it to rattle around from side to side... also fuel can leak pass the o-ring on the brass part
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Post by muttsnuts on May 27, 2013 20:12:41 GMT 1
if the float height is too low then you will find at higher sustained rev's that the bike will just die on you, it will make you think it is seizing or the likes (its just run out of fuel), if the float height is too high then you will most likely get overflowing of fuel - so it will piss fuel all over the floor, or if its not overly bad, it can under certain conditions cause surging when coming off the throttle as the engine can draw the fuel into the engine due to the height of it being too high. HTH I think you have your float heights confussed with fuel levels a low float height will give a richer mixture .... the floats control/determine the fuel level, so they are related, if your float height is less than recommended then the fuel level will be higher, if the float height is more than recommended then the fuel level will be lower as the floats don't have as far to go before closing off the fuel via the needle valve. Agree about the float height affecting the fuel mixture though, it is a crucial setting and needs to be within spec for the carbs |
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db8888
Thrash Merchant
Posts: 329
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Post by db8888 on May 27, 2013 20:24:50 GMT 1
if the float height was 21mm to make it richer you would make the float height smaller ie 20mm because the floats are closer to the needle jet there's more fuel needed to come into contact with the floats ....if the floats heights bigger ie 22mm less fuel is needed to contact the floats ie weaker
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Post by muttsnuts on May 27, 2013 20:52:37 GMT 1
if the float height was 21mm to make it richer you would make the float height smaller ie 20mm because the floats are closer to the needle jet there's more fuel needed to come into contact with the floats ....if the floats heights bigger ie 22mm less fuel is needed to contact the floats ie weaker agree |
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horace
Thrash Merchant
Posts: 456
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Post by horace on May 27, 2013 21:03:03 GMT 1
Would have thought they would make it more clear in the manual ,there's usually a plus or mius amount either side of the said float height ,I've always thought there or there abouts ,might start trying a bit harder!  |
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Post by Tone on May 28, 2013 10:57:04 GMT 1
The tolerance for the LC and YPVS carbs Float height is plus or minus 0.5mm (half a mm) from 21mm float height. The tolerances for the float heights seem to have reduced over the years probably due to emmisions as the old RD250/400C float height was 23mm plus or minus 2.5mm and the RD250/400E was 23mm plus or minus 1mm.
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