Question about 1985 Moto Guzzi Le mans III

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If my bike has no vacuum lines that might leak but dies at full throttle could it be the electronic ignition or maybe worn jets? It has been sitting in a shed for a while so I have replaced the leads, spark plugs and cleaned the fuel filters etc. If the throttle is rolled on slowly it's not as bad.

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Get a rebuild kit for your carbs. Make sure u clean the pilot jet line in the carbs, this is a favorite to get blocked make sure the floats are coming all the way down and releasing the valve letting the fuel into the carb.Oh and take off the pet cocks on the tank they have filteers that get blocked easy. Good luck

Posted on Apr 19, 2010

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Bogs out under throttle


Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Pinholes or torn diaphragm.
6. Accelerator pump leaking or no output.
7. Plugged bowl vent or overflow.
8. Fuel level in bowl too low.
9. Restricted fuel supply passages.
10. Plugged jets or passages.
11. Worn or damaged needle or needle jet.
12. The enrichner valve not seated or leaking.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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1 Answer

2007 yamaha virago 250 starts, idles ok, bogs at acceleration


Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Pinholes or torn diaphragm.
6. Accelerator pump leaking or no output.
7. Plugged bowl vent or overflow.
8. Fuel level in bowl too low.
9. Restricted fuel supply passages.
10. Plugged jets or passages.
11. Worn or damaged needle or needle jet.
12. The enrichner valve not seated or leaking.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Bogging at full throttle


Hi, Trent and the usual suspects are:
1. Inlet system air leak.
2. Enrichener valve not seated or leaking.
3. Damaged or restricted fuel tank vent system.
4. Restricted fuel supply tract.
5. Dirty or damaged air cleaner element.
6. Plugged bowl vent or overflow.
7. Worn or damaged needle or needle jet.
8. Vacuum piston assembly malfunction.
9. Loose or plugged main jets or passages.
10. Improper float level.
11. Accelerator pumps inoperative.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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1 Answer

2001 Shadow Sabre, Won't idle with choke off unless giving it some throttle.


Hi, Rickgilbreat and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
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1 Answer

2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied


Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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1 Answer

I have a 1996 883 HD XL sportster.it will start but then dies out.if I crank on and of the throttle I can keep it running. But when I stop it dies out.could this be something plugged in the Carb,or vacuum...


Yes, it could be either something plugged in the carb or vacuum leaks. If the bike has been sitting for over three months, it's probably the jets are plugged in the carb. You'll need to pull the carb and go through it. Use that pressurized carb cleaner to clean out the jets and all passageways in the carb.

Make sure you put a new carb to intake seal on the intake before you put the carb back on. Also, check the hose that comes off the backside of the carb. It supplies vacuum to two things, the VOES switch up between the tanks and the vacuum operated fuel petcock. Make sure the hose has not cracked or come loose from either of these. I at least one occasion, I found the vacuum operated petcock to be leaking air. The bike would not idle. It would run but would pop and spit back through the carb. I had to take it out of the tank, disassemble it, and reassemble. After that, it worked but I don't know for how long. I suggest replacing the vacuum operated petcocks with manually operated petcocks. I've only seen one leak air but I've seen lots of them leave riders stranded with full fuel tanks but no fuel in the carb. They will malfunction and leave you stranded.

Feb 20, 2010 | 1993 Harley Davidson XLH Sportster 883...

1 Answer

Blke runs for a couple miles then dies


Now, this may sound overly simple but I've seen it work more times that I care to tell. Next time you go for a ride, loosen your fuel cap. Don't take it off, just loosen it. If the vent system in your fuel tank is not working, it will do this exact thing you're describing. Check your vent system to be sure it's open and working. I've seen rusty fuel caps not vent and I've seen "dirt dobber" wasp nest built in the vent tubes of fuel tanks. The bike runs for a short distance, sputters and dies. Shortly, it start back up but will do the same thing in just about the time and distance.

If that's not it, go by an electronics store and buy a small can of "component cooler". Take the cover off the ignition unit. Ride the bike until it dies. When it dies, spray the electronic ignition unit with the component cooler and see if the bike will start up immediately after you cool the unit. If it does, try it again until you're satisfied that the problem is heat affecting the ignition unit. If this test proves not to be the problem. we'll have to look for something else.

You can also try running it without the air filter. Run it until it dies and then look into the carb and "milk" the throttle a couple of times. You should see a jet of fuel from the accelerator pump squirt into the carb throat. If you do, then your problem is not fuel related. If you don't see the fuel squirt into the carb, your engine is starving for fuel for some reason. Check the fuel supply hoses and the petcock. The petcock on your bike is vacuum operated. There is a small vacuum line that feeds vacuum to the VOES switch and the backside of the petcock. I've seen lots of these petcocks go bad and leave the riders stranded with a full tank of fuel but none to the carb. I'd replace the petcock with either a pre-1996 unit or a good aftermarket unit, a manually operated one.

The oil going into the breather is common. On a bike that is several years old, like yours, the small "umbrella" seals in the rocker box cover has probably hardened and is not sealing well. To fix the problem, pull the rocker boxes off and replace the unbrellas and the gaskets. Reroute the crankcase breather system away from the air cleaner. Good Luck!

Nov 12, 2009 | Harley Davidson XLH Sportster 883 Hugger...

1 Answer

My motor dies without so much as a miss at full throttle but runs smoothly if wound on smoothly to two thirds throttle. Could this be worn main jets? It has electronic ignition


Sounds more like a vacuum leak, check any vacuum hoses for dry rot. Next, I would start by removing the carbs and pulling the fuel bowl checking for some rust or crud on the jets, ck for any small ports on the jets. A worn jet would let in more fuel and should not cause a shut down at wide open throttle.

Nov 11, 2009 | 1985 Moto Guzzi Le mans III

1 Answer

My motor dies without so much as a miss at full throttle but runs smoothly if wound on smoothly to two thirds throttle. Could this be worn main jets? It has electronic ignition.


It sounds like your float chamber is not filling up quick enough on full throttle. Take the carbs off and clean them, rplace all the the jets and the float valve. The trouble with the new fuels they crystalise and gum up after only afe months of not using the bike. Good luck.

Nov 11, 2009 | 1984 Moto Guzzi Le mans III

1 Answer

1998 honda shadow will not start


Hi and welcome to FixYa,

Initially, a few possibilities you may want to check/explore:
  • stale gasoline;
  • clogged fuel filter (inside the tank above the fuel shutoff valve;
  • clogged, bocked, varnished, gummed carbs, jets, air pin holes;
  • stuffed air filter/box;
  • vacuum leak (rubber coupling, manifold side);
  • air leak (airbox base assembly seated/fitted on the carbs.
Basically, a general cleanup of the fuel lines, tank and the carbs. Sitting for some time tends to leave varnish like coating on most parts.

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 16, 2008 | 1998 Honda VT 750 C2 Shadow

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