Question about 1998 Yamaha XV 535 Virago DX

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Missfire on my xv535

Miss fires when engine gets hot

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Check your plugs and see what color they are,they should have a nice tan color if they seem to be wet (smell of gas ) you are running too rich,etc. If it is in the fuel portion.Could possibly be in the firing also ,something getting too hot after riding for awhile and cutting out (coils , etc).Also could be a bad plug on one cylinder.Buy you a Clymer manuel or something simliar to try to narrow your choice down because there are a lot of varibles involved in misfires .

Posted on Mar 27, 2009

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Posted on Feb 15, 2009

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2004 sportster miss firing

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

Dec 21, 2013 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Xv535 starttng problem

More information required ... what is the nature of the problem? Starter will not run, engine will not fire, engine will not continue to run after start, out of gas?

Good quesitons get good answers here.

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Dec 01, 2012 | 1989 Yamaha XV 535 Virago DX

1 Answer

I own a 1988 fat boy.started to missfire on the rear cylinder. have checked the leads /plugs/and single fire coil. start the bike up from cold runs real sweet.take here out on the road roughly 4.5 miles...

I would check the compression on the engine. It should be about a hundred pounds and there should be no more than 10% difference between the cylinders. The next thing I'd do is check the primarys of the coil. Your bike came with a dual fire ignition system on it from the factory so this means that the ignition system is not stock. This is where I'd be suspicious. The coil will have three terminals on it if it's a single fire coil. Check between the center terminal and the outer terminals. You should have 2-3 ohms resistance from the center terminal to one of the outer terminals. Check center to one terminal, then center to the other terminal. If this checks good, it may be the ignition unit itself. Take the cover off of the timer cavity in the nosecone of your engine and go for a ride. If this cures the problem, then you know this is it, getting hot and misfiring. If it keeps missing, stop by a Radio Shack or an electronics supply house and purchase a small can of "component cooler". Ride the bike until it starts missing and spray a bit of the cooler on the ignition unit. See what happens. It could be a vacuum leak as well. Might be the intake to head gaskets or the intake manifold seal where the carb plugs in if the carb is stock.

Good Luck

Aug 20, 2011 | Harley Davidson FLSTF - FLSTFI Fat Boy...

1 Answer

I have a 1991 FXR Super Glide with a front cylinder that won't fire. I have replaced coil, plug wires, plugs, carb manifold and seals but she's still miss firing. Can anyone give me any...

You need to run a compression test on the engine. The cylinder pressure should be around a hundred pounds or more. There should be no more than 10% difference between the cylinders. If the compression is low enough to cause it not to fire, you probably have a blown head gasket.

You didn't mention what kind of igntion system you have in the bike. If you have the original ignition system, it's a dual fire system and both spark plugs fire at the same time every time the pistons come up to top dead center. This means that one cylinder fires on the exhaust stroke and this is called a "wasted spark" system. Harley has used this type of ignition for almost all their Bit Twins and Sportsters for many years. If your bike has an after market single fire ignition system, the ignition system could be bad causing the missfire. In this case, you would have an aftermarket coil as well with three primary connections on it.

Good Luck

Jul 01, 2011 | 1993 Harley Davidson FXR Super Glide

2 Answers

My VN is missfiring even when hot, checked jets & air flow! Any ideas?

Check your spark plug caps(should read 5000 ohms, higher or lower replace) At the same time put in new plugs. It is very common to foul plugs with unleaded fuel. Could be other things causing problem but these are the cheapest easiest things to start with.

Jun 20, 2010 | 1997 kawasaki VN 1500 Vulcan Classic

1 Answer

When I ride my bonneville it runs fine even from cold but when it is hot when I stop at junctions and move off it missfires on the left cylinder for a while then it's ok.Could it be the coil?

most likely its a coil since when they get hot and underload that is when they may miss you can check this with a spark lod tester they are not that expansive only about 10 dollrs at your locale auto zone, just load that ciol and see if it fails...

Nov 09, 2009 | 2001 Triumph Triumph Bonneville

1 Answer

Miss fire on number 1 cyl ,spark from plug ,cleaned carb cyls 3-4 hot 2 nearly as hot 1 luke warm

I would have to say that I think it's not miss fireing.
It could be the coil for those 2 cyclinders. It could be in the carbs. When you cleaned the carbs did you remove them from the engine and dismantel them completly? Clean every parts and blow out all the air and fuel ports. Did you seperate the carbs from each other? If you did the carbs will need to be synced again. Good Luck.

Oct 16, 2009 | 1994 Yamaha FZR 600

2 Answers

Engine miss fire and occasional backfire.

Hi and welcome to FixYa,

Initially, a couple of ideas you may want to consider/explore:
  • if still using carbs, then lean air/fuel mixture or if using aftermarket filters such as K&N, then rejetting required;
  • if using injectors, exhaust issue, aftermarket muffles/pipes are installed with no re-mapping done.
Good luck and Thank you for using FixYa.

Jan 04, 2009 | 2003 Honda VT 750 CD Shadow A.C.E. Deluxe

1 Answer

Feels like a misfire

It's time to adjust the valves. You have tight valves and most likely need to adjust the cam chain. This is classic when the valves are tight. Most likely you can start it up when cold ok but after a few minutes performance deteriorates this being due the valve lash being to tight.
The miss fire is due to a lean situation.

Dec 01, 2008 | 1998 Suzuki GSF 600 N Bandit

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