Question about 1996 Yamaha SZR 660

1 Answer

Spark plug fouling when cold starting

Spark looks weak at cranking speed, fitted new iridium spark plug this seems to have improved starting, if I clean spark plug and refit it will start ok.

Posted by on

  • gpmoto May 11, 2010

    is battery fully charged and hold up to a load test? if so is starter turning as fast as it should to turn flywheel fast enough past stator to produce enough primary voltage in ign. coil?

  • joe May 11, 2010

    are you using the correct heat range spark plug for this bike?

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    New Friend:

    An expert that has 1 follower.

  • Expert
  • 132 Answers

Sounds like the carb wants cleaning and re-balancing

Posted on Jun 19, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I tried using quick start on it, but all that did was make it sputter a bit, so I am assuming that the fuel is not reaching the cylinders, anyone have any ideas?


1) Check for spark remove one of the plugs, connect the plug wire to it and ground spark plug base to a good ground , such as the cylinder head , position the plug so you can see the electrodes , crank the engine over , a fat blue spark should be evident. 2)If the spark is good , check for one or more of the following possible malfunctions 1) Obstructed fuel line or filter.2) leaking head gasket(s)3) low compression. If the spark is not good, check one or more of the following a) Weak ignition coil(s) b) Weak CDI unit. c)Loose electrical connections. d) Dirty electrical connections. e)Loose or broken ignition coil ground wire. f) Broken or shorted high tension lead to the spark plug. Difficulty in starting. Check for fouled spark plugs, Improperly adjusted choke, contaminated fuel system, improperly adjusted carburetor,weak ignition unit,weak ignition coil (s), poor compression

Feb 05, 2011 | 1980 Yamaha XJ 650

1 Answer

The bike was running fine. now it will not start at all. Does not seem to be getting any spark


Fouling a spark plug with unleaded fuel and wet fouling a spark plug with ethanol fuel is more common than you would think. Take out the old plug. Test for spark with a new plug. Then put in the new plug.

Sep 13, 2010 | 1998 Honda XR 400R

1 Answer

Weak ignition spark


Make sure battery is up at least 11 - 11.5 volts
A low battery will spin over and sound like it should when cranking sometimes, but the starter will rob spark from the ignition and not fire due to low voltage

Jul 17, 2010 | 1981 Yamaha XJ 650

2 Answers

I just purchased a honda cb250 1975 no spark


If there is no spark your points are probably dirty or just grounded out. Try a new points and condenser set. Install the points carefully so the new set does not ground. I assume you already tried new spark plugs and spark plug caps.

Jun 06, 2010 | 1972 Honda CB 250

1 Answer

Engine wont start


The spark plugs if they are blackish it means rich on mixture and thus they have fouled up and will give you hard start. If they are brownish whitish tht means they are ok, and if they are whitish means the engine is running lean.
Since you checked the the fuel pump and after removing the pipe fuel gushed out it proves tht the pump is functioning.
Getting back to spark plugs....remove one of the spark plugs and earth it on the cylinder head somewhere and fix the lead head to it and thn crank start the engine and see if theres good bluish sparks at the spark plug.
I would recommend you first to examine the spark plugs , replace them if necessary and try to start it.
Hope this helps!

Jun 15, 2009 | 1999 Yamaha FZX 250 Zeal

1 Answer

2002 vtx1800c cranks but does not start.


hello and welcome
as i understand the vtx cranks but does not start. a good place i would start to look is the spark plugs. first you can verify that the plugs are not blackened over and wet. this would happen from fouling. with the vtx not turning over properly with the old weak battery alot of fuel was used in the cylinders and possibly fouled them out. ive seen that be a very popular problem. the other it to check for spark if the plugs appear to be fine. this can determine if something was faulted in the ignition.

Mar 19, 2009 | 2007 Honda VTX 1800 F

1 Answer

91 kx 250 blows smoke and drips alot of unburnt oil out the pipe


Does it have a stock pipe,carb,any modifications! If its stock,I would put a new ring and piston in it,it seems like your getting a lot of blowby,also make sure your air filter is clean. It would help if you used an iridium spark plug.

Jan 21, 2009 | kawasaki KX 250 Motorcycles

1 Answer

Engine wont fire up


Do you have fresh gas in the bike? Try changing the plugs with new ones and check for spark. You can do this by putting the new plugs on the plug wire and grounding it to the head on the engine crank the motor over you should see a bright blue spark. Check one plug at a time. No spark check the ignition wires and coils. As for the oily plugs it could be they are just fouled caused by either flooding the motor while trying to start, bad plugs, week coils, bad gas, poorly adjusted carb's. I would start with the plugs and work my way back to the carbs. Still fouling the plugs after all that start checking the engine, ie compression check ect.

Dec 14, 2008 | 2003 Suzuki VL 125 Intruder LC

3 Answers

Rear cylinder not firing


The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

Dec 07, 2008 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Starting problems


Auto or manual choke? Could be out of adjustment. Cold engine idle speed may be too low. Fouled sparkplugs may be producing a weak spark (always buy high quality plugs). Maybe a weak coil. Make sure it's covered at night. Do they sell electric dipsticks for MC's? Hope you find the problem. Good Luck.

Nov 20, 2008 | 1982 Honda GL 1100 Gold Wing

Not finding what you are looking for?
1996 Yamaha SZR 660 Logo

Related Topics:

280 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1128 Answers

D. E. Hev

Level 3 Expert

1059 Answers

mikeuk

Level 2 Expert

61 Answers

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

Answer questions

Manuals & User Guides

Loading...