03 750 ace only runs with choke

[stubb]

im having trouble with my 03 ace. The bike will run with choke on but pops and backfires etc. if i touch the throttle just a little it dies. i can give it a quick jump to about 1/4 throttle and it will run but pops carb farts backfires.

i have pulled the carbs 3 times this eve cleaned them the first time. then had to take them back off and adjust the floats as i had gas poring out the air cleaner breather. fixed that issue. Drained the tank put in some premium same thing no change.

i also had to change out the plug wire on left side as the old one broke off. i did notice the main jet is 160 and the idle jet was a 40 if i remember right. bike does have a hyper charger on it and i believe stock exhaust.

I also made sure the fuel pump was working correctly the carbs are getting fuel.

the gas that was in the tank didnt look nasty no crap floating in it.

im not sure what to check next. i dont really want to pull the carbs off for a 4th time but if i have to i will.

any help would be appreciated.

[Scrapdog2grand]

Originally Posted by stubb

im having trouble with my 03 ace. The bike will run with choke on but pops and backfires etc. if i touch the throttle just a little it dies. i can give it a quick jump to about 1/4 throttle and it will run but pops carb farts backfires.

i have pulled the carbs 3 times this eve cleaned them the first time. then had to take them back off and adjust the floats as i had gas poring out the air cleaner breather. fixed that issue. Drained the tank put in some premium same thing no change.

i also had to change out the plug wire on left side as the old one broke off. i did notice the main jet is 160 and the idle jet was a 40 if i remember right. bike does have a hyper charger on it and i believe stock exhaust.

I also made sure the fuel pump was working correctly the carbs are getting fuel.

the gas that was in the tank didnt look nasty no crap floating in it.

im not sure what to check next. i dont really want to pull the carbs off for a 4th time but if i have to i will.

any help would be appreciated.

did you get the bike in this running condition? or did it recently start to run like this? did the bike sit for a long time. sometimes when it comes to cleaning dirty carbs will take 2 or 3 times before they are right.
if there is anything in the tank will most likely settle, and possibly make it way through the fuel system.
make sure you have a good battery and the charging system is working properly, was the broken ignition wire replaced properly, and are the rest in good condition, the popping and no throttle responce sounds like it not really getting fuel.
the carbs will get easier to take off and put back on, I can pull mine in less then 8 minutes.

[stubb]

i got the bike acting this way. the bike supposedly sat since april of this year. i got a new wire and new end and installed them and should be correct. Battery is charged and is about2 months old. the rest of the plug wires are in good condition. when i cleaned the carbs i didnt use any carb cleaner just blew the jets out with an air compressor. i also didnt take the pilot adjustment screws out. maybe ill take them off again and use carb cleaner. should i soak them in anything over night?

[SkullCrusher]

If you didn't use carb cleaner you didn't clean the carbs....better buy the big can.

[Scrapdog2grand]

Download the service manual if you havent all ready, definetly remove them and disasseble them completely, but do not seperate them.
dont soak any rubber or plastic in carb cleaner, soak them over night in pinesol or a household cleaner for as long as possible, you can use a spray can carb cleaner to spray out passages, then blow them out with compressed air.
soak all the hard parts, jets and emulsion tubes in carb cleaner. use soft wire, like thin copper strand to run through them and blow them out as well with spray can carb cleaner and compressed air.
DONT soak the float valves, the rubber ends will swell up. and dont forget to remove the air cut valves, and mixture screw o-rings and washers.
the fuel enrichmeny circuit in the carb will be next to the main and pilot jet, it is not removable, it will have to be blown out, very small passage, to small for a strand of wire.
Let us know how you make out with it!!
any questions hit me up.

[stubb]

ok so i got the carbs off in 15 min this time. took everything off. noticed there is one vacume line running from one carb to the hyper charger but the other port on the carb is hooked to nothing. im guessing this is where you hook up to sync the carbs. ill have to get a plug for the other side as this may be part of my problem.

next one carb where the needle from the slide goes into the carb looks like someone tried to take the little brass piece out and bent the lip around the hole. the hole its self that the needle goes in to looks unharmed so i dont think it will hurt anything.

the piolet screws on both carbs only have springs in them i didn't see any o-rings. the only o rings i pulled out was out of the air cut valves. and the little black breather tubes that i took off.

am i missing anything? i dont have any pinesol so ill have to go get some or find an alternative. i have the jets soaking in carb cleaner as we speak.

[Scrapdog2grand]

Originally Posted by stubb

ok so i got the carbs off in 15 min this time. took everything off. noticed there is one vacume line running from one carb to the hyper charger but the other port on the carb is hooked to nothing. im guessing this is where you hook up to sync the carbs. ill have to get a plug for the other side as this may be part of my problem.

next one carb where the needle from the slide goes into the carb looks like someone tried to take the little brass piece out and bent the lip around the hole. the hole its self that the needle goes in to looks unharmed so i dont think it will hurt anything.

the piolet screws on both carbs only have springs in them i didn't see any o-rings. the only o rings i pulled out was out of the air cut valves. and the little black breather tubes that i took off.

am i missing anything? i dont have any pinesol so ill have to go get some or find an alternative. i have the jets soaking in carb cleaner as we speak.

use a small peice of copper stranded wire, make a hook to pull out the oring and washer. the post on the carb for the hypercharger is nomaral a cast over over from the factory for 49 state model, and is drillout for the HC, unless it is a cali model.
the posts to sync the carbs have screws in them at the cylinder head where the intake boots clamps.

The brass peice that looks bent, you may be refering to the needle jet, they get worn ond become out of round, see if I can find a pic, you will also find pic's of a worn needle jet at factorypro's website.

[John Hopkins]

Two questions..did you replace the fuel filter, and what colour are the sparkplugs.

John.

[93gc40]

FIRST we will assume you are working with a fully charged and GOOD battery. Because if the battery is weak, you will have the these symptoms also.

It is normal for the choke to be required for a few minutes at start-up. Espwcially if temps are below 70. IF the motor is cold, it will not accept throttle, because it requires a rich fuel mix at that point of opperation, hence the choke. Adding throttle LEANS the mixture, it does NOT add fuel, ever. Now if it still wont accept throttle AFTER a few minutes on choke or the choke can't be rduced while it is warming to maintain idle. you may have a fuel supply issue.

[stubb]

The battery is a sealed maintenance free one and i put it on the charger first thing when i got it and it is fully charged. I have had that issue in the past when i first started tinkering with bikes.

soaked the jets and just pulled them out after about 8 hrs the 40s jet on the side that the throttle cables hook up on was clogged. I couldnt see the hole at all. took a stand of wire and cleaned it out. cleaned all the other holes in the jets so they are ready to go. i pulled the carbs out of the pine sol and blew out the holes and ran a stand of wire thew them and then stuck them back in the pine sol to soak some more.