Planet Minis

lockworks · 01-25-2006, 03:23 PM

I have a 1991 CT70 with 100 miles it idles rich and wont drive over 10 mph without removing the air filter assembly. I've cleaned the carb and jets with no improvement. Does any one know the float setting for this bike or have any other ideas to cure this thing. Thanks, Jeff

yz80rider586 · 01-25-2006, 03:26 PM

i dont exaclty know but you can prbably just by a xr 50 carb and itl be perfecto but with carb you have........ turn the air ful mixture screw to the lleft and experiment......there not to hard of carbs to work with.....but just double check evrything gas tank full brakes rubbing? im not exaclty sure but just a little idea

SprNtrl · 01-25-2006, 03:56 PM

If the bike is running rich (indicated by a black, dry spark plug. If the plug is black and wet, you have an oil leak) then you can try to raise the clip on the needle attached to the carb slide (the exact name escapes me) in order to lean out the mixture. Drop it one increment at a time and check if it lean, but not TOO lean. You should also try adjusting the air screw out from full closed 1 1/2 turns and adjust by turning the screw either way 1/4 to get the highest rpm. If it starts revving high, turn the idle screw out until the bike is at around 1500 RPM +/- 100RPM, or a comfortable, nice idle. Get a new plug.

Take off the air filter assembly and clean the filter out with gas and put a bit of clean motor oil in it. remove any excess oil from the filter.

thumperclone · 01-25-2006, 03:56 PM

gas and tank clean??(recommed a clear in line filter) if its a model pb 37b float level is 10.7 mm,main jet55 ,1 3/4 turns out on pilot screw,fixed needle jet clip 1500 rpm idle+/- 100..what altitude are you at ? take your main jet down one size if over 5000 feet ...
clymer manual # m310-13

lockworks · 01-31-2006, 04:04 PM

Found it! Bad float valve. Thanks for your help. Jeff

01-25-2006, 03:23 PM	#1 (permalink)
lockworks PM Newbie Join Date: Jan 2006 Posts: 4	CT 70 float adjustment I have a 1991 CT70 with 100 miles it idles rich and wont drive over 10 mph without removing the air filter assembly. I've cleaned the carb and jets with no improvement. Does any one know the float setting for this bike or have any other ideas to cure this thing. Thanks, Jeff

01-25-2006, 03:26 PM	#2 (permalink)
yz80rider586 2nd Gear Member Join Date: Jan 2006 Posts: 404	i dont exaclty know but you can prbably just by a xr 50 carb and itl be perfecto but with carb you have........ turn the air ful mixture screw to the lleft and experiment......there not to hard of carbs to work with.....but just double check evrything gas tank full brakes rubbing? im not exaclty sure but just a little idea

01-25-2006, 03:56 PM	#3 (permalink)
SprNtrl 3rd Gear Member Join Date: Jul 2005 Location: Toronto, Canada Posts: 1,183 My Mood:	If the bike is running rich (indicated by a black, dry spark plug. If the plug is black and wet, you have an oil leak) then you can try to raise the clip on the needle attached to the carb slide (the exact name escapes me) in order to lean out the mixture. Drop it one increment at a time and check if it lean, but not TOO lean. You should also try adjusting the air screw out from full closed 1 1/2 turns and adjust by turning the screw either way 1/4 to get the highest rpm. If it starts revving high, turn the idle screw out until the bike is at around 1500 RPM +/- 100RPM, or a comfortable, nice idle. Get a new plug. Take off the air filter assembly and clean the filter out with gas and put a bit of clean motor oil in it. remove any excess oil from the filter.

01-25-2006, 03:56 PM	#4 (permalink)
thumperclone 2nd Gear Member Join Date: Nov 2005 Location: colorado Posts: 317	gas and tank clean??(recommed a clear in line filter) if its a model pb 37b float level is 10.7 mm,main jet55 ,1 3/4 turns out on pilot screw,fixed needle jet clip 1500 rpm idle+/- 100..what altitude are you at ? take your main jet down one size if over 5000 feet ... clymer manual # m310-13

01-31-2006, 04:04 PM	#5 (permalink)
lockworks PM Newbie Join Date: Jan 2006 Posts: 4	Found it! Bad float valve. Thanks for your help. Jeff

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