Question about 2007 Qlink Legend 250
Just bought my bike used, loved the way it looked: Problem is, it idles beautifully, but as soon as you throttle it dies out (same as hitting engine kill). Carb looks very clean, double and triple checked everything, all jets are clean, diaphragm appears to be in wonderful condition (was going to replace it, but it looks new, no light showing through). Can get into second gear at idle, then work the throttle enough to get it into third, but I can't just hit the throttle and go. Adjusted the fuel adjuster to 2 full turns out and air to 1 full turn out. The bike doesn't die instantly now on the throttle (delayed *****, actually tries to throttle). Since the air adjustment screw is buried inside the carb assembly, I am curious what this should be set at (don't want to tear it down, adjust, put back together, try, rinse repeat). I am almost certain it is air/fuel mix, but alas I could be wrong. Any suggestions? @
Hi, Bryan and the usual suspects are:
1. Idle port, transfer ports, slow air jet clogged.
2. Idle adjusting screw set too low.
3. Air fuel mixture adjustment too lean.
4. Pilot/slow fuel jet clogged.
5. Faulty accelerator pump.
6. Float level too low.
7. Float bowl contaminated old fuel, water, dirt, rust, etc.
8. Carburetor bowl vent line clogged/blocked/pinched.
9. Fuel line to the carburetor kinked or pinched.
10. Fuel filter clogged.
11. Intake manifold leak.
12. The gas cap is not venting properly or fuel tank venting system blocked.
13. Vacuum line from the intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
15. Multi carburetors not in sync.
16. Faulty fuel pump or internal fuel line has pinholes.
17. Fuel injectors clogged or faulty.
18. Faulty throttle position sensor.
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Posted on Dec 02, 2019
Hi have you checked fuel filter or filter in the tank also make sure the fuel line has no kinks you say the diaphragm looks good make sure there are no holes or it's not sticking as this will cause fuel level to be low in float chamber and cause fuel starvation.Good luck.
Posted on Oct 13, 2014
Testimonial: "Yeah, checked all that. Went ahead and backed the air off by 1/4 turn (to make it 3/4 turn out) and took the fuel down to 1/2 turn out. Purrs like a kitten now when throttled. Only put 20 miles on it this afternoon, but that's 20 miles with stops every block so it was a long ride (which since my problem was throttling from idle, this was what I needed to feel satisfied that this problem was resolved)."
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Posted on Jan 02, 2017
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Mar 10, 2018 | Motorcycles
First, use the same oil and mix it the same from batch to batch, once you have made a batch (gallon or what ever, never add gas or oil to make more, use up the batch to the last drop, then make a new gallon). Be sure the air filter is clean, some are weted with oil to catch more dirt and provide a bit of extra suction, clean and spray it with a spray cookingoil or soak it in oil fuel mix. Next: Look for 3 adjustment screws on the carb. should be three total. 1 screw is for idle adjustment. the other 2 should be close to each other, one is low speed fuel/air mix and the other is high fuel/air mix. Adjust the low fuel/air mix screw until it will idle un-added with the throttle then adjust the idle on the throttle to get a good idle speed. Next adjust the High fuel/air mix until it gets the RPM's you want it to have. It should go from idle to high speed with out hesitation or cough. It should also run with power to cut any weeds or limbs with out bogging out.
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