My bike is a 1999 L9 UK spec,I've had the carbs rebuilt recently including new o rings and a service on the jets, and a new battery and exhaust aswell as plugs and oil and filters. I know the tank is clean because i flushed it myself. The bike spluttered and stopped following a couple of weeks of unsteady idle, now the bike turns over but will not start. Before i strip the bike to get to the fuel pump i tested the pump relay with a small ohm meter and got a very high reading on terminals 3-4, would this cause the bike to conk out and not start? apart from the pump itself is there anything else i should look for? thankyou.
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Remove the carb from the bike.
Completely disassemble the carb
Soak all jets, needles, springs, screws and carb body in a carb solution overnight.
Do Not soak any o-rings or the float. Clean the float with a brush, and replace the o-rings if they are flat.
Rinse with water and then blow everything out with compressed air.
Make sure you can see through the jets and the small holes on the side of the jets.
Make sure you blow through every hole in the carb body.
Reassemble carb, mount on bike.
It will run like new again.
NOTE: When removing the air/fuel mixture screw, turn it in(clockwise) until it stops and STOP turning, Do Not try to tighten any further.
Count the number of turns it took to stop. Write it down so you dont forget overnight. Remove it for cleaning.
When you reassemble the carb, turn the air/fuel mixture screw in until it stops.
Now turn it out(counterclockwise) the number of turn you counted.
If your not sure turn it out 2 turns.
Yes, your carburetor needs to come off and be disassembled and put into a carburetor solution and soak for at least 2 - 24 hours depending on how bacd it looks when you take it apart.
Then rinsed with water and then blown out with compressed air, in every orfice in the carb body and jets
Reassemble and she'll puurr like a kitten again and have great response, run like new.
Ever since they have been putting ethanol in the gasoline, i've been doing a lot of carb cleanings.
Your gas tank will get a build up of ethanol residue that turns thick, it eventually clogs up petcocks and fuel filters and the little holes in the sides of the carb jets.
Soaking them brings them back to life without scratching, soak everything taken out of the carb except o-rings, gaskets,and float. Then soak the whole carb body and all the jets.
So i would suggest that when you do the carb clean, you drain the old gas out of the gas tank, and start off with a fresh tank of gas, and a new fuel filter.
You can also add seafoam to your fuel and this seems to help prevent corrosion of the ethanol.
I would squirt some fuel in the cylinder to see if it fires, then if it does, blame the jets in the carb being set wrong. Get some fresh gas, and a new plug if you have one. The carb settings might be fixed but still wrong. If they are adj, take them all the way in, then out 1 1/2 turns, this should get it running, if the jets are fixed on the inside, they might need some deep cleaning, did you make sure they were real clean??? Poke a wire through them and blow through them?? Check it out.
I just went through this over the last 2 months with my 97' Standard. I tore down the carbs, cleaned, replaced all O-rings, Vac tubes and rejetted with new Factory Pro jets. Did not solve the problem. I finally determined it was the gas. I must have gotten a bad tank of the stuff. As soon as I swithed over to a name brand, Cheveron, Texaco, Exxon, etc. the problem was solved. Give that a shot before you start tearing things apart like I did.
Morning,, yes I did find the problem.. previous person that worked on it installed the main jet tube upside down. The Red one with the two "O" rings on it. I cut off the crimped end and opened the hole and reinstalled it and it started right up.... Thanks anyways....
sounds like the main jets are partly pluged, you must remve all brass jets and seats including needle jet and its slide soak in carb cleaner and blow out with compressed air only.. hold up to bright light to verify if all are clean. jim
I had a simular problem with my 88 xr. It started out just running bad at higher speeds which had me thinking it was a carb or plug problem. I started changing plugs and had varing results which still had me guessing. So I started adjusting and jetting the carb. Still the same varing results. I suspected the CDI box so I tried to get one. (I live in Thailand, not the easiest thing.) The parts places produced several boxes that plugger in but gave me the results you just described. Good spark but no start, I also got one box that started the bike real good but would not accelerate. There is a built in timing in those CDI boxes. Just thought you might check this, By the way the original box of mine eventually failed completely and I was correct in my suspicions. I found a used one and it runs great.
Had your bike sat a long time without being started? Been down real bumpy roads? I worked on a friends 1999 883 Sporty recently, it needed the carb rebuilt. I cleaned out all jets and passages, and float level was reset, it was out of adj.. Also, when diagnosing bike hard starting and backfiring out the air cleaner problem, I found the timing plate had losened up and the timing was off about 7 degrees which I adjusted back to spec before I rebuilt the carb. The plugs were also clean, not dry..Runs Good Now. The shop 1st looked at bike before I did, they said it was an Ignition problem and changed out the key switch which did Not solve problem.
timing could be slightly take the magneto casing off then remove the cylinder head when the piston is at the top of cylinder head a metal lump on the magneto should line up with the first or second marking on the casing behind the magneto, carb might need cleaning,if its been rebuilt because of piston ring blowing then maybe they didnt skim your head properly your best off takin the bike apart which really aint that differcult go up to the main engine lump and you wont have that many problems