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Mhu 75 spark igniter not sparking

Not sparking

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Why is my Harley Davidson 883 Sportster miss


Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below and good luck:
Harley Davidson Sportster error codes and how to access them

Sep 07, 2013 | Harley Davidson Motorcycles

1 Answer

I have a 75 iron head wont get spark but has power going to coil


If the condenser has failed, across the points, it will not spark. turn the engine until the points open. Turn on ignition, with a small screwdriver, open the points and there should be a small spark and the plug should also spark. If it doesn't, with a 12volt 5Watt bulb, connect one side to the frame/engine and with the other wire go to the points. When open the bulb should light and go out when closed. If all seems OK, replace the coil as they are notorious to fail when warm. My 1965 Shovel had me going round in circles for a brief while as well. Keep logical about your fault finding.

Mar 24, 2017 | Cars & Trucks

1 Answer

Mhu 75, only one burner lights


did you put a drip pocket on the line to the heater

Apr 05, 2012 | Mr. Heater MHU75NG

1 Answer

My mhu 75 worked just fine until the regulator on the tank froze. Got the gas to flow, combustion air blower came on but no igniters. Control board LED is blinking the fast flash saying everything is fine....


check the flames sencor is clean and the igniter check connections to the board on both wires , check hoses to pressure switch are not cracked or , you could cut off abit off the end to get better connection on the tubes hope this helps

Jan 14, 2011 | Mr. Heater MHU45LP

1 Answer

I have a lp 75-125 reddy heater. when pluged in it no longer sparks to ignite fuel. I have the style were the ignitor is always sparking an arc.


The tranformer that sits under the motor for the igniter could be burnt out. You can use an ohmmeter to check it. I'm assuming yours has a spark plug. Make sure it isn't fouled and has a gap of .050".

Dec 25, 2010 | Reddy 30m Btu Lp W/th Heater

1 Answer

1987 corvette starts and runs smooth. 5 to 10 seconds later it shuts down like the key was turned off. Alt. tested and was bad. Replaced alt. Battery tested. Failed test and replaced it. Still quits...


This sounds like you may have an ignition module failing. Run it and when it dies, have some one crank it while you check for spark. If no spark is found, replace the ignition module. This piece runs about $75. Not too bad relatively. Let me know what you find.

Nov 02, 2010 | 1987 Chevrolet Corvette

1 Answer

Spark plug gap on 1995 volvo 960 replaceing sparkplugs


Spark Plug removal procedure & gap info...
  • Remove spark plug access cover. (Black cover on top of engine.)
  • Once you have the black plastic cover off, number the coil packs with a magic marker 1 - 6 front to back so you can correctly replace them.
  • Coil packs are held in with a pair of 10mm bolts (A and B in the illustration. Later 960s have only one bolt at A).
  • Once you have the bolts out the pack should just pull out. A little twisting may help as there is an "O" ring seal at the top of the valve cover and a big boot at the spark plug.
  • Remove coils from spark plugs. Do NOT disconnect coil wires. (VERY IMPORTANT)
  • Inspect the condition of the wiring going to the coil pack. Look for crumbled insulation or charring. See 960 FAQ file for information on failing engine wiring harnesses.
  • If you have comprssed air blow out the plug cavity before you take the plug out. As an alternative use a vacuum cleaner and brush to clean any "stuff" out of the hole to avoid having it fall into the cylinder.
  • Remove spark plugs. Use a good quality, rubber insulated spark plug socket. Once they are unscrewed, you have to haul them up out of the hole.
  • Check and adjust spark plug gap to: 0.030" (.75 mm)
  • Install clean, "un-oiled", spark plugs and torque to: 18 ft. lbs .
  • Refit ignition coils.
  • Reinstall spark plug access cover.
  • narrow-gap risk: spark might be too weak/small to ignite fuel;
  • narrow-gap benefit: plug always fires on each cycle;
  • wide-gap risk: plug might not fire, or miss at high speeds;
  • wide-gap benefit: spark is strong for a clean burn.

Jun 10, 2010 | 1995 Volvo 960

1 Answer

I have a 1974 dt 250 same as an dt 360 the bike has sat in a barn about 4 yrs it will not start removed and cleaned the gas tank went thur the carb new plug used ignition coil compression about 50 to 75...


Compression is too low!

Replace the piston rings.

Also check continuity from engine to frame till high-tension coil...
Check if breaker points aren't dirty ( clean out with fine sandpaper )
Check breakerpoint settings

Oct 31, 2009 | 1974 Yamaha DT 360

2 Answers

Please HELP


www dot desatech dot com is a parts distributor for reddy heat products. on their main page they have a short troubleshooting guide. the motor needs to provide 3.5 psi of air across the fuel nozzle to suck the fuel out of the reservoir. check your ignition source (spark plug, hot surface igniter) if the hot surface igniter is broken get a new one, if the spark plug don't spark, check the gap might be too big. see if the spark plug is grounded. poor grounds will cause intermittent sparking. check the high voltage wire for breaks in the insulation, might be shorting out to ground BEFORE the plug. gap should be 75 thousandths.

Dec 04, 2007 | Reddy Heater-30-55,000 BTU Variable

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