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I have no spark from coil wire. Also I think the high and low adjustment knobs on the carburator have been moved out of adjustment. Is there a way to adjust these knobs by counting the turns from fully tightened? What should the distance be between the coil and the magneto?

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The gap should be about 15 thousandths of an inch,or a thin piece of cardboard,or about 3-4 sheets of paper.try disconnecting the kill wire,and see if youve got spark.dont normally have high adjustment,you have [sometimes]idle mixture screw,and idle screw,but these wont stop it going

Posted on Jul 05, 2010


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What makes spark for plug?

In a 2 stroke the spark usually is generated by a magneto, coupled to a coil, rather than the voltage being supplied by a battery as in a car.

This is essentially a rotating magnetic field which produces a low voltage insufficient for the spark plug. That then is transformed to a high voltage by the coil, but with a low current, producing a fat spark for a fraction of a second.

So if the engine is hard to start, it could be

- worn piston rings causing low compression
- dirty air filter (doesn't take much in a 2 stroke)
- worn magneto breaker points (if fitted)
- cracked high voltage lead to the plug
- dirty or incorrectly gapped plug (discount this of course)
- mixture screws incorrectly adjusted

This may assist

Nov 03, 2016 | Homelite Garden

1 Answer

2006 Dyna low rider starter problems

Hi Dmhaye, and the usual supects are:
1. Spark plugs are in bad condition, improper gap, partially fouled.
2. Spark plug cables in bad condition.
3. Battery nearly discharged.
4. Loose wire connection at one of the battery terminals,coil, or plug between the Ignition Control Module.
5. Throttle controls not adjusted correctly.
6. Water or dirt in fuel system/tank
7. Water or dirt in carburator.
8. Intake air leak.
9. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricking fuel flow.
10. Inrichner valve inoperative.
11. Engine lubricant to heavy (winter operation).
12. Ignition not functioning properly (possible sensor failure).
13. Faulty ignition coil.
14. Valves sticking.
For a prime suspect please visit the website below and good luck:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Jun 04, 2012 | 2005 Harley Davidson FXD - FXDI Dyna Super...

1 Answer

Yardman xm3100 will not start. Original problem was a stone blocking the blower but the mechanism now spins freely. What is the turns adjustment for the needle valve?

Turn the needles clockwise until they bottom out. Do not tighten them. Then back out (turn them counter clockwise) the needles to 1 1/4 turns. Start the unit, then adjust the low speed screw (indicated by an "L" on the carb body) until the unit idles well. Then run unit up to max speed and adjust the high speed screw (indicated by an "H" on the carb body) and adjust. You are not looking for the highest speed possible, that indicates an lean mixture which will burn up your engine. You want the engine to lope with a slightly rich mixture. Adjust the high speed screw until the unit runs well at max throttle, but you want it to lope (slow a bit and then catch up a bit at regular intervals) a bit. You may have to go back and tweak the low speed adjustment after setting the high speed.

You should also make sure you have spark. If not, check your on-of switch, and check to make sure the small wires coming off the side of the coil (not the main lead that goes to the spark plug) are not grounding out somewhere. Check the gap between the coil and the flywheel; it should be .010-.012 of an inch. If that is OK, then pull the smaller wires off the coil and then test again for spark. If you have no spark with the small wires disconnected, replace the coil.

To check the spark, pull the spark plug out of the head (turn it counterclockwise), connect the spark plug wire to the spark plug, touch the threads of the spark plus to a metal part of the engine and plug the rope; you should be able to see a spark if there is one. Do not worry about the color of the spark. On modern engines, the coils is solid state and the spark color is not a problem.

If those things a re OK, then check your fuel lines and the fuel and air filters. If that is not the problem, more that likely you need to clean and rebuild the carb. 90% of the problems we have experienced with small engines are fuel related and NOT spark related. We clean and rebuild more carbs that we do anything else.

May 07, 2011 | Yard Man Mulchinator QuickShift BlowerVac...

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Hard to start, when i get it started it fine shut it off try to start it hard to start

General advice aplicable for all gas powered chain saws;
Clean air filter regularly.
-Adjust spark plug gap (very important). A faulty gap will either cause poor spark or a overloaded and damaged spark plug coil.
-Use correct good quality spark plug
-Use correct oil/fuel mix ratio and correct oil.
-Do not use old premixed fuel if you can avoid it.

Carburator adjustment;
-idle speed setting screw should be set so that the saw idles well, without engaging the chain. If you normally have to press the gas lever to be able to start it coul indicate a to low seting. Clockwise will increase idle speed. This screw is found near the carburator and is slightly larger the the two adjusment screws.
- fuel-air mixture screws can be set to standard factory setting as a start. Normally there are 2 screws labeled L and H, for Hi and Low rpm band adjustments. Factory setting are usually 3/4 turn out(anti clockwise) from fully closed setting for both (clockwise to closed position).
Experiment with adjustments by 1/8 increments at the time. Anti clockwise turning will increase fuel to air ratio and opposite. Warm weather will require a slightly leaner mix and cold weather will reqire a slightly richer mix(more fuel). Low rpm setting only serves the idling performance. The Hi rpm setting can be evaluated by removing the spark imediately after running at full load for a period. The spark plug should be dry, and be lightly brownish at the electrodes. White-ish color indicates low fuel to air mix, and this causes too high combustion temperature. A black colour indicates a too high fuel to air mix ratio, and it causes carbon build up on the plug.

If you still have starting problems, cylinder/piston compression is the next to check for. This is a more extensive job and should best be left to professionals, unless you are very skilled and have access to special tools required. Compression on modern saws are very delicately balance, so the slightest damage to either the rings, piston or cylinder can cause problems. Is is not alwas worth to replace the cylinder and piston kit, so compare prices and ask for advice at your dealer.

I hope this helps you.

Feb 25, 2011 | Poulan P3416 16Inch 34cc 2Cycle Gas...

1 Answer

My 1998 dyna superglide keeps bogging down, backfiring, powering back up. This happened 3x in about 5 miles. Then it shut off completely. Do you think it could be the coil?

You need three things in order for an engine to run. Compression, Ignition, and fuel. Since it doubtful that you have lost compression, let's work on the other two.

First, pull your spark plug wires off and put a new set of plugs in the wires. Ground them to the engine and spin the engine with the starter. Do you have spark? The answer to this question will provide us with the next step. If you do not, do you have power to the coil. If so, disconnect the wires on each end of the coild and check the resistance of the primary circuit in the coil. It should be between 3 and 4 ohms. If not, repalce coil. If you do have spark. Move on to the next step.

Is the bike carburated or fuel injected? If carburated, are you getting fuel to the carb. Check the vacuum operated petcock. They came out in 1996 and have been a problem ever since. I went to a manually operated petcock. Pingle, well worth the money.

Check you gas cap. If he vent in the cap is stopped up, vacuum builds in the tank and eventually no gas comes out of the tank.

Good Luck

Aug 10, 2010 | Harley Davidson FXD Dyna Super Glide...

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I have a ford explorer 99 but it's giving a error code PO306 what do u think it is

It sounds like a misfire. Check spark plugs 5 and 6. It could be bad fuel, bad plug wire, or weak coil. Check the fuel injectors as well. Other possible causes could be an egr valve stuck open, vacuum leaks, low fuel pressure.

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1 Answer

Volfenhag amp adjustments

Firstly, you will want to set all options to a low pass, so the high frequencies are filtered away from the subs, avoiding damaging the voice coil. Start with the Gain of the amp about 3/4 of the way up, and all other knobs, such as the bass knob to the lowest setting. From there, test your subs for soujnd, and then change the gain and amount of bass for the sound you desire, since each person is different. I have my gain about 1/2 way up and the bass about 1/4 of the way up. If you have a crossover knob, set it to the highest frequency available, since the low pass will filter all the high frequencies out anyway.

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My 120hp evinrude 1993 stop when i cruise at low speed

There always that possibility and if the injectors are identical you could switch them and see if the problem moves. Then you know its that one injector. The other possiblity is spark. The wire or the coil for that plug could be weak.

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