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Starting problems xs1100

I have a 79 xs 1100 special that will not start. I have thorougholy cleaned the carbs, tank, and petcocks, replace battery, gas lines and spark plugs. It does have spark. The previous owner may have messed with the flywheel timing. Any suggestions. Thanks

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  • Contributor
  • 17 Answers

You will need the main components: Fuel, Fire and Compression to have a running motor. It sounded like you have the first two covered.
Have you actually checked the compression to make sure there is at least 120psi pressure in each cylinder? Also, what is the condition of the oil? You will have to use a good compression tool to check each cylinder where you remove all spar plugs so none are covered other than with a flat cloth on top to prevent oil spills, then crank the engine (no more than 7-8 times) and see where the pressure stops. If any pistons are stuck, you may have to use tiny bit of PBBlaster or Marvel oil to loosen them up. You may have to repeat this a few times as you check the pressure in between. Is the Starter good?

Posted on Mar 18, 2014

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6ya6ya
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Posted on Jan 02, 2017

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tabbycat282
  • 56 Answers

SOURCE: 1989 tw200 yamaha won't start

G'day egdbcs . Ok.now lets see.You say good spark,so i'm presuming you are doing the old sight test.Try bending the arm on a know good sparkplug about 5-6mm,earth the plug and kick'er in the guts(crank it over)Be very carefull , high voltage danger.If there's still a good spark it's safe to say that there will also be a good spark under pressure in the combustion chamber,speaking of which you should also do a compression test,anything over 100psi should be ok. as i'm not to sure of the extent of the re-build,hopefully the valves were lapped and checked for straight and true and valve seals replaced,if you notice oil on the tip of the spark plug you could have a leaking valve seal or oil seal .Try putting a small amount of fuel directly into the combustion chamber ,tighten up the spark plug ,install the plug cap and.......Yeah ..You guessed it ..."kicker in the guts".If all the abouve are correct and true it should fire up.If it runs for 5-10 seconds then stops you've got some sort of fuel starvation problem , could be dirt in the carb,blocked idle jet ,or air passage or even the needle could have come off it's clip,believe me with an old bike like yours anything could be worn and loose inside that carby.The only other thing to consider is the timing.There may be a good spark but is it happening at the right time inside the engine???. I'll leave it all in your capable hands EGDBCS.Hope this helps to solving your worries. Chow for now......Tilleydog..

Posted on Jun 03, 2009

holmestead
  • 5 Answers

SOURCE: Will not run without choke

have you checked for vaccuum leaks at the intake manifold? you can check by pouring water over the gasket area when/ if you get it running!

Posted on Jun 14, 2009

  • 101 Answers

SOURCE: 1980 Yamaha XS 1100 Carduretor diagram

It is part of a detent mechanism for the choke. No, all 4 carbs do not have them, only 1.
Here is a link to Yamaha's website, where you can pull up a diagram of your bike's carbs. The ball is #10 and there is also a spring with it.
http://www.yamaha-motor.com/sport/parts/home.aspx
They are saying there are 2 balls and 2 springs, but I do not remember them having 2. I also don't see another #10 or #11 on the picture anywhere. You should be able to look at the rod that connects all the chokes together and see if there are 2 sets of dimples for the balls. Obviously there will be one set in carb #1, if you find another set of dimples for a detent ball, then there indeed would be 2. Also, the carb body would be drilled for the spring and ball like the #1 carb is.
Thanks
RSRBOB

Posted on Oct 05, 2009

  • 4 Answers

SOURCE: vtx 1300 won't start

Hi I have had the same problem with my 2007 VTX1300S, the problem was caused by the fuel tap diaphram this comes in two parts on this model the vacumn side and the actual fuel cut off side. the two sides become seperated and cut off the fuel supply. the smaller inner part should fit into the outer main part.

Posted on Mar 26, 2010

  • 3567 Answers

SOURCE: 1980 Yamaha XS 400 Special First,

First, you need a good battery. The bike does have electronic ignition. Soak the carbs in denatured alcohol for two hours after removing the float bowls, then clean with spray cleaner. Spray into every large and small hole you can find. Remove the rubber diaphragm from the center of carb prior to cleaning. New diaphragms are $196 each. Check all fuses. Put in new spark plugs, NGK-BP7ES. Clean the air filter. Get a can of spray starter fluid and spray on the air filter. The rubber mounts for the carbs are likely to be a problem once it gets running. It looks like they are still available at Babbitt's, $53 each. If un-carburetored air can get into the joints it will lean the fuel mix and cause uncontrollable high idle.

Before you sink a lot of money into the bike, check for spark. If spark is present, coast the bike down a good sized hill without any spark plugs being installed. Put the bike in 3rd gear as you go downhill then let the clutch out to turn the engine over. Now ( using the clutch lever ), shift through all the gears then neutral. If the bike will not shift properly it likely has a bent shift fork. I can't find any forks avaiable. With a bad tranny I would put it back in the dirt floor building and find a newer bike. Here is a link to Babbitt's. Please rate my answer. Thanks.
www.babbittsonline.com/pages/parts/viewbybrand/default.aspx

Posted on Aug 13, 2010

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1 Answer

Good spark clean carb and tank. Wont even backfire or try to start.


Hi, Pete and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
Good luck and have a nice day.

Nov 19, 2015 | GAS Motorcycles

1 Answer

Won't start just backfires


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. A stuck bent or burnt valve.
18. Tip over sensor needs a reset.
19. Check for engine trouble codes.
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.
https://yamahaclub.com/forums/topic/23165-custom-1981-xs400-special-wont-start
Won start backfires
Yamaha XS 400 SH Service Manual ENG XS360 2D XS400 2E 2F SG Supplement ENG...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jul 13, 2014 | 1984 Yamaha XS 400 L Maxim

1 Answer

How to clean gas tank and carburator of old gas


Get some carb cleaner and get that carb dismantled and sitting in that carb cleaner for a few hours. Drain that tank and run some approved gas tank cleaning agents all through it. Take the petcock off and check/clean out and usually - there'll be a filter type set up either attached to petcock or on inside of tank. The carb, the petcock and the tank - get them right before you even try to start it.

Jan 05, 2014 | 1997 Honda VF 750 C Magna

1 Answer

I have a 1980 yamaha xs 1100 special, it sat in a garage for 3 years, i replaced the fuel lines, cleaned the tank, and replaced the plugs, how come it only idles when the choke is on and it sounds like a...


You probably have varnish build up in the carburetors, causing restricted air flow, and therefore the engine is running too lean, especially on the right side, and a lean running engine will run hot at the exhaust. It only idles when the choke is on because the choke creates a richer fuel supply. A can or two of commercial fuel cleaner through the fuel supply may get the engine's jet's orifices cleaned out. Otherwise, overhaul the carbs.
Hey, nice old bike, though. Good luck

May 20, 2011 | 1979 Yamaha XS 650 F

2 Answers

My bike was starting hard in fact the last few


The reason it might be leaking through the overflow hose is probably because one of your floats are stuck. Reason it might be hard to start is because you might need a new spark plug or carb cleaned.

Jul 29, 2010 | 1980 Yamaha XS 400 Special

2 Answers

81 xs400 isnt revving up all the way and wont go above about 60 with full throttle. maybe a petcock/fuel supply problem?


Start with changing the spark plugs, spark plug wires, and air filter. Drain the tank and fill with fresh fuel. To drain the tank, hook up a clear section of tubing from the fish part of the pet section at your local Wally World or Petco to the petcock so you can see if there is any crude or rust flowing out. Strain the fuel through a paint strainer and use it in a lawn mower.

Dec 19, 2009 | 1981 Yamaha XS 400 Special

1 Answer

Bike sat for a long time with fuel in tank. Tank was previously sealed. I changed spark plugs, tore apart and cleaned carbs. It will only start for a few seconds if i spray starting flued in the air...


stored gasoline begins to deteriorate/lose octane/after only two weeks.drain fuel tank label and disconnect fuel lines at petcock,remove petcock from tank,clean fuel screen.re-assemble,check for supply to carbs. Honda's of that vintage have a seperate 'reserve' tank under the battery,which tends to collect all the 'crud',and must also be purged.trace your fuel lines to see if your unit is so equipped,

Oct 10, 2009 | 1985 Yamaha XJ 700 X Maxim

3 Answers

I have a 1997 honda vt1100 that won't start. Its been sitting for about 4 months. I took the tank off to get it powder coated. Due to financial probs. The bike sat longer than expected. I put tank back on...


my 1997 Honda vt1100 shadow will not idle wn=hen choke is off, but idels and runs with choke on and backfires on deceleration and acceleration what is my problem?

Aug 14, 2009 | 1997 Honda VT 1100 C Shadow Spirit

1 Answer

Help with getting Yamaha 1981 Special running after winter.


Drain the old gas out of the tank to start with. Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Be sure the bolts are tight. INSTALL AN IN-LINE FUEL FILTER. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.


Please rate this solution. Thanks!

Apr 11, 2009 | 1981 Yamaha XS 400 Special

2 Answers

Rough running


This problem, ironically, might simply be the screen filter on the in tank petcock. The zrx is a gravity fed filter-less fuel system with only the screen to act as a filter. I had the same problem with my black 2001 zrx and did a full tune up before pulling the petcock and cleaning away 9 years of sediment from what appeared to be a very clean tank. I simply purchased a seal kit from Kawasaki before the tear down and waited till the tank was as empty as it would get by riding it. The screen was surprisingly clogged with junk...and once cleaned and reinstalled the bike no longer ran poorly when cold. Im not sure why the bike being warmed up made a difference but it did......now it starts and runs like a champ (colod or hot)!!!

Apr 02, 2009 | 2000 kawasaki ZRX 1100

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