Question about 1986 Honda VF 1100 C

1 Answer

Bike is starting to backfire (more of a burp) at low speed and trouble holding a steady idle. ?bad gas or could it be valves or rings?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,978 Answers

Chances are you just need new spark plug caps and new spark plugs. Modern resister caps burn out periodically or the get corroded (I have heard of people unscrewing and taking out the inside resister and cleaning off the corrosion). Some times the cap is part of the wire (about$40-$50 dollars each) But you may be able to replace the "NGK caps" for about $5 each( clip the wire and screw on the new cap). This is cheap and easy to try and will usually fix the kind of miss you describe.

Posted on Sep 03, 2010

  • 3 more comments 
  • ffopus Sep 04, 2010

    checked carbs and filter, dirty fuel at last fill up

  • ffopus Sep 04, 2010

    checked carbs and filter, dirty fuel at last fill up

  • ffopus Sep 04, 2010

    checked carbs and filter, dirty fuel at last fill up

  • ffopus Sep 04, 2010

    checked carbs and filter, dirty fuel at last fill up

  • ffopus Sep 04, 2010

    checked carbs and filter, dirty fuel at last fill up

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

When cold starts but dies.to start, peddle to floor, rev a minute then it idles but at times dies when accelerating from a stop. Raw gas smell present and puff of blue smoke when it starts.


have you checked the cylinder compressions as backfire and blue smoke can be a symptom of low compression , either rings or valve seats but would need a dropdown test to be sure

Sep 20, 2015 | 1998 Saturn SC

1 Answer

Backfiring and trouble starting


If you change the exhaust pipes, you have to sync the carbs (if you cant sync them, you have to change the carb jets), usually it is backfiring because the carbs are not in balance.

May 18, 2013 | 1996 Honda VT 600 C Shadow

1 Answer

Yamaha tw 125, adjusted valves to correct spec, now exhaust dont sound right, bike not idling properly


Hi, Brian and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
2005 carb issues slow to idle down
http://yamahaforum.com/forums/utility-atv/2475-1997-yamaha-timberwolf-idle-backfiring.html
Yamaha TW125 1999 Service Manual
OEM parts for Yamaha
YAMAHA TW125 Owner Manual

Feb 27, 2013 | 2001 Yamaha TW 125

1 Answer

Backfires and runs rough when letting up on gas.


the pulse timing ring in the distributor have it checked , the metal ring is held in place with platic studs and these studs get worn, then the ring starts to move. Also check the EGR valve

Jan 28, 2013 | 1992 Dodge Dakota

2 Answers

I have a low idle problem in my 99 mazda B2500. The truck will die after starting if i dont hold in the gas pedal


replace the idle air control valve, thats the problem on those about 90% of the time, its that valve. good luck.

Dec 13, 2009 | 1991 Toyota Pickup

2 Answers

97 VZ800 missing


Check valve clearance, as vlaves wear the gap closes, most riders don't bother to adjust them till they have a problem like this.... By the way the valve may be part of the issue for backfiring while deccerating but Pipes cause this.

Sep 03, 2009 | 1998 Suzuki VZ 800 Marauder

2 Answers

Flatlining at 3000 RPM


maybe the cam timing is off. If the engine was torn down and reassembled wrong, that would do it. Connect a vacuum gauge to the intake manifold and see what you get for vacuum readings.
It should be about 17 inches at idle. And, it should be steady.

d3b9af0.gif
  1. NORMAL READING: Needle between 51-74 kPa (15-22 in-Hg) and holding steady.
  1. NORMAL READING DURING RAPID ACCELERATION AND DECELERATION: When engine is rapidly accelerated (dotted needle), needle will drop to a low (not to zero) reading. When throttle is suddenly released, the needle will snap back up to a higher than normal figure.
  1. NORMAL FOR HIGH-LIFT CAMSHAFT WITH LARGE OVERLAP: Needle will register as low as 51 kPa (15 in-Hg) but will be relatively steady. Some oscillation is normal.
  1. WORN RINGS OR DILUTED OIL: When engine is accelerated (dotted needle), needle drops to 0 kPa (0 in-Hg). Upon deceleration, needle runs slightly above 74 kPa (22 in-Hg).
  1. STICKING VALVES: When the needle (dotted) remains steady at a normal vacuum but occasionally flicks (sharp, fast movement) down and back about 13 kPa (4 in-Hg), one or more valves may be sticking.
  1. BURNED OR WARPED VALVES: A regular, evenly-spaced, downscale flicking of the needle indicates one or more burned or warped valves. Insufficient hydraulic valve tappet clearance will also cause this reaction.
  1. POOR VALVE SEATING: A small but regular downscale flicking can mean one or more valves are not seating.
  1. WORN VALVE GUIDES: When the needle oscillates (swings back and forth) over about a 13 kPa (4 in-Hg) range at idle speed the valve guides could be worn. As engine speed increases, needle will become steady if guides are responsible.
  1. WEAK VALVE SPRINGS: When the needle oscillation becomes more violent as engine rpm is increased, weak valve springs (6513) are indicated. The reading at idle could be relatively steady.
  1. LATE VALVE TIMING: A steady but low reading could be caused by late valve timing.
  1. IGNITION TIMING RETARDING: Retarded ignition timing will produce a steady but somewhat low reading.
  1. INSUFFICIENT SPARK PLUG GAP: When spark plugs (12405) are gapped too close, a regular, small pulsation of the needle can occur.
  1. INTAKE LEAK: A low, steady reading which can be caused by an intake manifold or throttle body gasket leak.
  1. BLOWN HEAD GASKET: A regular drop of fair magnitude can be caused by a blown head gasket (6051) or warped cylinder head-to-cylinder block surface.
  1. RESTRICTED EXHAUST SYSTEM: When the engine is first started and is idled, the reading may be normal but as the engine rpm is increased, the back pressure caused by a clogged muffler, kinked tailpipe or other concerns, will cause the needle to slowly drop to 0 kPa (0 in-Hg). The needle then may slowly rise. Excessive exhaust clogging will cause the needle to drop to a low point even if the engine is only idling.
    When vacuum leaks are indicated, search out and correct the cause. Excess air leaking into the system will upset the fuel mixture and cause concerns such as rough idle, missing on acceleration or burned valves. If the leak exists in an accessory unit such as the power brake booster (2005), the unit will not function correctly. ALWAYS FIX VACUUM LEAKS.

May 25, 2009 | 1994 Ford Mustang

1 Answer

Bike backfire


Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Nov 10, 2008 | 1984 Suzuki GSX 750 EF

2 Answers

2004 Ford Ranger Low Idle


I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part

Jul 04, 2008 | 2004 Ford Ranger

Not finding what you are looking for?
1986 Honda VF 1100 C Logo

117 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4533 Answers

yadayada
yadayada

Level 3 Expert

76630 Answers

bazzz7071
bazzz7071

Level 2 Expert

342 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...