Question about Harley Davidson FLHR-FLHRI Road king Motorcycles

1 Answer

2001 road king help

Carb clean new plugs both have spark compression on both cylinder but left exhaust running cool and left side of bike shakes bage more

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  • Paul Henley May 16, 2014

    u might need to check both plugs are the same heat rating.that would make one side run cooler.plus just because its anew plug doesnt mean its agood one.u have to remember eveythng is mass produced

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  • Expert
  • 137 Answers

Two other things to check. valve lash and sync the carbs. Both can cause cooler exhaust on one side

Posted on May 19, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Benimur
  • 6966 Answers

SOURCE: 1979 suski 750,bike runs on 2 left side cylinders,

Hi and welcome to FixYa,

With the indulgence of craigjamesbt...

A few additional ideas to consider:

  • it would be an electrical/ignition issue if 1 & 4 or 2 & 3 will not fire but not 3 & 4;
  • almost always, raw fuel on exhaust indicates a flooded engine. A flooded engine would most likely be a carb issue;
  • best way to determine if it is an engine concern is to do a compression test;
  • a way to test the right carb pair is to deliberately starve them of fuel by temporarily plugging/blocking the inlet port/seat with rubber similar in appearance as to those used for glue gun, not installing the needle and float. Assemble the carb and install. Start the bike and use/spray carb cleaner on the right side carb. Note if 3 & 4 will fire even intermittently.
Would appreciate a postback on results/updates on any developments.

Good luck and thank you for using FixYa.

Posted on Apr 27, 2009

v2iper
  • 150 Answers

SOURCE: what size spark plug for a 2000 harley davidson road king carbed,

Your Twin Cam plug should be a 6R 12 Harley Plug. Often times the back fire is just the nature of the beast depending on what type of pipes you are running. Harleys do run lean, its an EPA thing thtas why they choke them down from the factory. Since you have a carb you could have an intake leak around the Intake. Also Under the carb is an adjustment screw. Harley plugs it up so people don't play with it. You have to just drill out the plug this will set your air fuel. Whenever I take a carb off I drill out that plug. Heat your bike up operating temp and ear tune that screw. Only other way is with air fuel analizer or a dyno. good luck.also that backfire is caused by fuel hitting your exhaust when you let off just to let you know.

Posted on Jun 15, 2009

  • 163 Answers

SOURCE: i have a 1974 dt 250 same as an dt 360 the bike

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

Posted on Nov 01, 2009

pistonrings
  • 53 Answers

SOURCE: Front cylinder misfire at idle,then raise rpm's to

I am not sure if the bike is a 650 or 1100 but in either case it sounds like a fuel issue or and air leak. When the carbs were off for re-jetting did they get cleaned? The slow circuit controls to about 2000 rpm and it sounds similar to your problem.

The first thing to look at is the carb synchronization. If the front cylinder is lagging, it can give the same symptoms. I do not think that the exhaust is a factor because the front is cold when running.

Spray some WD 40 at all the intake manifold area when the bike is running and see if the idle changes. the idle will change and push some smoke out of the exhast if the intake is leaking.

If both of these check good I would pull the carbs back off and clean the slow circuits out completely. This is delicate work and shoud be done by and experienced tech.

If I can help some more just send message.

I hope that his helps. Steve

Posted on Jan 18, 2011

wd4ity
  • 4565 Answers

SOURCE: I have a 95 Road King that isn't running right, it

Backfiring out of the exhaust is usually an ignition problem. Unburned fuel is getting into the exhaust system because it's not being ignited in the cylinder. When the engine fires on that cylinder again, it ignites the raw fuel in the exhaust causing the pop that people call a backfire. I'd investigate the ignition system. Connect a timing light to each of the spark plug wires if it has a single fire ignition or either of them if the ignition system is the stock dual fire. Start the engine and watch the timing light to tell if the engine is missing as the light will miss a flash.

Good Luck
Steve

Posted on Jun 05, 2011

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I have a 99 road king flhr that sat for about a year outside. I changed plugs an oil an was running rich an wouldn't idle at low rpm. Clean out the carb an jets an now rear cylinder isn't firing...


Perform a compression test on both cylinders. If there is a significant difference between the two you may have a stuck ring or stuck valve from sitting.

Oct 01, 2012 | Motorcycles

1 Answer

I have a 95 Road King that isn't running right, it


Backfiring out of the exhaust is usually an ignition problem. Unburned fuel is getting into the exhaust system because it's not being ignited in the cylinder. When the engine fires on that cylinder again, it ignites the raw fuel in the exhaust causing the pop that people call a backfire. I'd investigate the ignition system. Connect a timing light to each of the spark plug wires if it has a single fire ignition or either of them if the ignition system is the stock dual fire. Start the engine and watch the timing light to tell if the engine is missing as the light will miss a flash.

Good Luck
Steve

Jun 05, 2011 | 2000 Harley Davidson FLHR-FLHRI Road king

2 Answers

On my pipes one side is hot and the other is cold


Check the pipe right where they come out of the heads. It depends on what type of exhaust system you have on your Road King. If the stock exhaust is on the bike, the rear cylinder exhaust is directed to both mufflers. With the exhaust from the front and part of the exhaust from the rear cylinders going to the right side muffler, it gets more exhaust than the left side and runs hotter. Like I said, check the temp of the exhaust pipes at the cylinder heads. If one of them is cold, that cylinder is not firing. As long as both of the pipes are hot there, you're fine. Just ride the bike and have fun.

Ride Safe.
Stevev

Apr 09, 2011 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

2001 yumbo moped. No spark it is pedle started but just wont start i have no manule and cant find one any ideas.


Try a new sparkplug. If the bike has a battery, it may need to be replaced. Is the air filter clean? Remove the bowl on the bottom of the carburetor and dump it out then clean the carb and bowl with a spray carb cleaner. Is the kill switch on the handlebar working properly? Is there a side stand kill switch? Is gas flowing from the gas tank to the carb? A 2001 bike is 9 years old. It is probably time for new crankshaft seals and a de-carbon of the cylinder head and exhaust port. The muffler could have an internal collaspe causing back-pressure that will not allow the engine to run. Remove the exhaust where it connects to the cylinder, check to see that the exhaust port is not plugged with carbon, ( the port should be about the size of quarter ), now try to start the bike without the exhaust hooked up. Check the fuses. Check all wire connections. This list should help as it is generic and would apply to most any two stroke bike.

Jul 14, 2010 | Motorcycles

1 Answer

Right hand cylinder on my rd200 not firing properly, the bike will run, starts perfect, exhaust gets warm on right hand side but no power to ride, any ideas?. have put in new spark plugs, leads and caps,...


Assuming you properly cleaned the carburetor low speed circuit.check the list below.
1.Check the compression on the right hand cylinder.
2.check your points,pull the point cover off start the bike and watch the points if you see bright sparks at the contact point the condenser is is bad.
3.If your constantly getting an oil fouled plug the right hand crankshaft seal is leaking transmission oil into the crankcase.
4.check your fuel flow from that line to that carb.
Hope this helps you determine whats going.


Jun 04, 2010 | Yamaha RD 250 Motorcycles

1 Answer

There is very little exhaust residue in the left side exhaust pipe compared to the right. The engine has been back firing. The exhaust system does not have any physical restrictions blocking the left...


It could be. However, (because you mentioned the backfiring) I would first make sure there is a nice, healthy spark to that cylinder. Also make sure the spark plug cap is not cracked. Look closely at the cap for any signs of 'carbon tracking'. These look like pencil lines drawn down the inside of the cap. This is evidence that the high voltage is traveling from the cap, to the engine - bypassing the spark plug. Any signs of carbon tracking means the cap must be replaced.

If the above checks okay, try a new set of spark plugs.

Finally, check the engine's compression. This will tell you if you've got a mechanical issue causing the problem. With the throttle held wide open and after a few revolutions of the engine, you need to see about 140 to 180 psi of compression on each cylinder. Anything less than 140 psi on a either cylinder - or more than about a 20% difference between the cylinders indicates a problem.

If the compression is low, the most likely causes are valves sticking in the valve guides - usually from excess carbon buildup, or worn / leaking valve seats.

Apr 02, 2010 | 2006 Harley Davidson FLHR Road king

1 Answer

2005 road king. where is the coil located?


I'm not sure where it's located on this late model but if you follow your spark plug wires from the spark plug up to the other end, you should find the coil. Most of the earlier RK have the coil on left side of the bike behind the horn. The horn is located on the left side between the "V" of the cylinders.

Jan 25, 2010 | 2005 Harley Davidson FLHR - FLHRI Road...

1 Answer

Describe your 1998 FLHRC-I GAS TANK Problem: Bike


get compression checked on the cylinder for that pipe could be rings worn if compresion is fine valve guides could be worn or damaged hope this helps

Dec 16, 2009 | 2001 Harley Davidson FLHRCI Road King...

3 Answers

1979 suski 750,bike runs on 2 left side cylinders, 2 right side cylinders are not firing, new plugs, plugs seem to be firing, rebuilt carbs adjusted, raw gas com coming from exhaust pipes on right side....


Hi and welcome to FixYa,

With the indulgence of craigjamesbt...

A few additional ideas to consider:
  • it would be an electrical/ignition issue if 1 & 4 or 2 & 3 will not fire but not 3 & 4;
  • almost always, raw fuel on exhaust indicates a flooded engine. A flooded engine would most likely be a carb issue;
  • best way to determine if it is an engine concern is to do a compression test;
  • a way to test the right carb pair is to deliberately starve them of fuel by temporarily plugging/blocking the inlet port/seat with rubber similar in appearance as to those used for glue gun, not installing the needle and float. Assemble the carb and install. Start the bike and use/spray carb cleaner on the right side carb. Note if 3 & 4 will fire even intermittently.
Would appreciate a postback on results/updates on any developments.

Good luck and thank you for using FixYa.

Apr 25, 2009 | 1979 Suzuki GS 750 E

1 Answer

I have a 89 suzuki gsxr 750,it fires but will not run for very long,i have cleaned carbs,checked spark,clean fuel filter in tank.any ideas?


Clean the air filter and, if you have one, remove the water trap bowl on the fuel petcock and clean it. How good is the battery? Install new STOCK plugs. Bear in mind it may be time for carb kits. Other than your cleaning the carbs, the carb kits and balancing and synchronizing of the carbs are best left for the shop to do.

Check the exhaust pipes. If there is a restriction in the burned gases exiting the tailpipe then the bike will not run right, will loose power and even die if too much back pressure builds up. Disconnect the exhaust system and tick off the neighbors with a quick ride around the block without a muffler. If the engine still dies then exhaust is not likely to be the problem.

Check the compression on all cylinders. Depending on the compression, the bike may be ready for a valve job. If you pull the head for the valve job then you might as well consider re-boring the cylinders and install new pistons and rings. Bear in mind, doing a valve job and / or pistons is not recommended for the novice. The good part is that when the work is finished you will effectively have a new engine.

Please rate this solution as "FixYa" if I have answered your questions. Thanks!

Mar 25, 2009 | 1990 Suzuki GSX-R 750 L

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