Question about Harley Davidson XL 1200 C Sportster Custom Motorcycles

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Have a 1984 HD Iron head, changed from 1000 to a 1100, starts runs but when we give more throttle it will back fire flames and pop. Has a S&S Super Shorty carb with exhaust cut down short. suggestion

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  • Harley Davidson Master
  • 43,880 Answers

Hi, Herb to many variables contact me at the email address below, for this scenario you will need your service/owners/parts manual if you can not find the first and best tool you ever bought for your Harley, despair not, for a mere zero $ you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a nice day.
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http://www.harley-davidson.com/content/h-d/en_US/home/owners/maintain-your-bike/owners-manual.html
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Posted on Jan 01, 2017

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Posted on Jan 02, 2017

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SOURCE: wont run for more then 10 sec

If you can do your own work, try some things if its dies you ether loseing fuel pres, injector control, or spark........ the fuel pres is easyest to ck, just stick a gauge between the pump and the rail, should be 42-43lbs, on the spark pull a coil stick and put an extra plug in it and fire up the bike be careful doing this is case of fuel leaks under tank, if the bike quits and you try to start it and you still got spark this may be ok, this is a bit more difficult, you have to ck the plug connections at the coil sticks, if you ck in a service manual each coil has two wires going to it one is going to be powered all the time, the other one is grounded by the ECM when the injector is supposed to fire, a node light will help in checking this, OR you can do what most of us do, take the bike to a good suz guy that knows what he's doing

Posted on Nov 10, 2008

  • 3567 Answers

SOURCE: kawasaki 300 bayou won't rev up.

No guarantees but try this. Pull the slide from the throat of the carb. Now move the clip on the jet needle down one notch. This will richen the low end mix. Two notches may be needed but do one notch at the start.

Posted on Apr 30, 2009

  • 82 Answers

SOURCE: Exhaust glows bright red.

These bikes dont like to idle for very long. If you ride at a reasonable pace, it shouldn't glow for long. If it persists... Your jetting is too lean. Check out thumpertalk.com for a pictorial step by step how to re-jet

Posted on May 08, 2009

  • 4340 Answers

SOURCE: 1984 GL1200 Goldwing... 80k mi.

This sounds like a fuel flow problem. I suggest removing and rebuilding and cleaning the entire system, meaning Carbs, filters and strainers in the tank. Old fuel turns to gel, and floats absorb fuel, sometimes, so inspedt everything. When finished set carbs with carb sticks, both at idle and at 2000 RPM, using hand throttle.

Posted on Oct 26, 2010

sisadsl
  • 1508 Answers

SOURCE: Pw50 starts first time everytime but will not

PW have the stop\start\run switch and will not rev in the start position, there may be a problem in this switch, wire, or the ignition box which controlls this.
The small 50s can also build up carbon in the exhaust port, or the exit end of the muffler.
They also need the original air filter and cover (dont know why, but they wont rev without it).
I realize you may have checked some of these, but not much else goes wrong

Posted on Jun 08, 2011

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1 Answer

SS super b carbarator adjustment on 1984 iron head


Push bike off a cliff and get a rice burner with fuel injection.

Apr 18, 2013 | 2008 Harley Davidson FLTR Road Glide

1 Answer

1983 vt 500 honda shadow. Replaced both head's. Starts fine has good power. Yet it pop's or back fires some times after giving it progressive fuel. What do you think. Thank you!


Three things that can cause popping or backfiring. 1)You may have cracked, leaking,or broken intake manifolds or bad o-rings on the manifolds. 2)Leaking exhaust gaskets in the head or between the head pipe and muffler. 3)Bad spark plug caps and partially fouled plugs. Check it out.

Apr 21, 2011 | 1984 Honda VT 500 C Shadow

1 Answer

I recently purchased a 2002 lowrider with only319 miles on it obviously it has sat awhile. It has a hard time idling on initial warm up and when warmed up giving it a little throttle (not under load) it...


The bike may suffer from a combo of the gas going stale in the carb, and may have slightly clogged the small passageways, but if it starts and runs you are halfway there. Use some carb or fuel injection cleaner in the gas tank to help out there. As far as cold start, it may be from a lean condition form the factory, and the coughing and popping are symptomatic of that. If you have a good HD shop nearby, they should be able to change the slow speed up just a bit, to pretty much take care of the issue of coughing, popping and cold start issues. My bike was the same, I bumped the low speed jet up , but still have a cold blooded bike, it takes a while to run properly form cold start, and will pop if driven too soon or if it is cold out until she warms up good. Some advice for cold start, use the choke know as usual, then push in the choke as soon as you can, and use the throttle to keep RPMs up about 1000 using throttle lock to RPMs there. As the motor warms up RPMs will increase on their own and you can adjust the RPMs lower as motor warms using throttle and throttle lock. Use your hand to touch the heads, as the motor warms up you'll feel heat, when she's too hot too touch, she is ready to ride. See you in the wind.

Jun 24, 2010 | 2002 Harley Davidson FXDL Dyna Low Rider

1 Answer

When letting of throttle it shoots out some flames? bike runs fine no problems.


this is unburnt fuel in the exhaust causing back fires this is due to to much fuel being let in on the carb there is a mixture screw screw it in 1/4 of turns and see if it improves if noit screw it in another 1/4 of turns a picture below will locate it cb0168d.jpg

Aug 26, 2009 | 2000 Harley Davidson FXD Dyna Super Glide

1 Answer

MISS FIRE


i have a 355 motor and i run autolite copper plugs and they work great, and most plugs are pregapped but just as a refrence 0.35 thousandths is the gap for that

Aug 11, 2009 | 1993 Chevrolet Caprice

2 Answers

V65 will start and idle fine but won't take any throttle!


Recheck the main jets in the carbs, there seems to be some kind of obstacle, pressure blow them.
Hope this helps.

Jun 19, 2009 | 1984 Honda VF 1100 C

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