Question about 1980 Yamaha XS 400

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My XS850, though getting spark, wont fire. It keeps flooding out after several attemots to start it. Is there a way to check the timing on this bike ? Any suggestions truly appreciated. Thbks

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Remove carbs and make sure all of the fuel inlets are seating properly. you should probably clean them good and set all the floats while you have them off.

Posted on Oct 02, 2010


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1 Answer

My yahama maxim 650 wont full start running but it sounds like it wants too

Hey Nick, unfortunately it could be several things. As Tom Diffin mentioned carb gummed up or even bad fuel from sitting all winter. If your positive the spark plug is firing (pull plug, connect to plug wire, place within a couple mm of a metal bolt, CAUTION: hold with insulated pliers so you don't get shocked, bump starter and watch for a spark) then try a very small squirt of fuel (starting fluid would be great) into the park plug hole and replace the plug. Try to start if the engine fires and then dies you have narrowed it down to carb, fuel or timing. FYI get a motorcycle repair or operators manual that describes how to winterize your bike for long storage (check library, you can read for free and make a photo copy of a page cheap). Keep us updated and good luck.

Apr 18, 2014 | 1982 Yamaha XJ 650

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Yamaha XS 850 won't start when hot@

Hi, Anonymous and the usual suspects are:
1. Faulty ignition coil.
2. Faulty spark plug cables.
3. Faulty temperature sensor.
4. Faulty starter motor.
5. Valves adjusted too tight.
6. Spark plug gap too wide.
7. Fuel has vapor lock.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Bike won start when engine is warm
Bike won crank when hot
Yamaha XS850G Owner Manual

Aug 08, 2013 | Yamaha Motorcycles

1 Answer

I have a 4 wheeler 110cc and it won't crank. The engine turns over but it won't crank. My grandson road it for hours and the next day it would not start. Any ideas???

If the engine turns over it is actually cranking. What you are describing is a 'wont fire' condition. Several things can be the culprit. First and simplest, make sure there is fuel and that the petcock is on "reserve" even if you think some is left. Second is to check the plug, remove it and check for moisture (could have gotten fouled/flooded in starting attempts). clean, dry, and check the spark. If you have fuel and spark, check the fuel filter and make sure fuel is getting into the carb. Fuel+air+spark = combustion as long as you're not flooded and there's no major mechanical problem. Since it was working last use, a flooded state or lack of gas seem most likely. However, some bikes also have an oil level sensor that will not allow fire if it is over or under full of oil, also worth checking.

Nov 25, 2009 | RTO Cycling

2 Answers


check to see if it is firingif it`s not firing it`s probably the coiland if it`s firing check to see if it`s easier to crank over than usual if so then there is no compression in which case u may have a big problem but i doubt that`s the problem 9 times out of ten when a bike wont start it`s the fire or maybe u forgot to turn the gas off and it`s flooded if u want to know if it`s flooded take out the spark pluge put a lighter by the hole and crank it over and u might be able to dry it out like that too

Sep 10, 2009 | 2004 KTM EXC 250

1 Answer

My 2003 ls300 Satrun wont start

Need to have Fuel and Sparks to fire up an engine. Let's check it out..
1- Start several times.
2- Take off one spark plug.
3- If it is wet, there is fuel.
4- If it is dry, no fuel. Fix this problem
5- While spark plug is out, touch it to the engin chasis and have a helper to start the ening so you can see if there is spark strong enough.
6- If there is no spark, Fix this problem.
7- If there fuel and spark then check out cold start valve, it is bad causing flood so it could not ignite.

Sep 08, 2009 | 2003 Saturn ION

1 Answer

( 93 cbr600f2 was crashed and rebuilt seems to have hot spark but wont start smells like its flooding Made just a couple gurgle sounds out of the pipe then a small backfire where do i start fire carbs...

sound like it's flooded over. i have one of these bikes for a stunt bike and had a similar problem before. use a fully charged jump box. connected it to your battery and hold the start button. don't use choke or give it any gas either. it mike take about 5-15 minutes to start, but it will.

Jun 13, 2009 | 1991 Honda CBR 600 F(2)M

2 Answers

I have a pit bike 125 its not starting wot so ever got good spark but still not start

If you have spark them it must be gas. eather no gas or to much gas. Put it on chock, be sure the shut off valve is in on position.Now crank it over a few times , if it wont fire. Check the plug , is it wet or dry .If its wet then it may be flooded and needs to dry out and air out the cylinder.Try starting when dry. If its dry try putting a 1/2 oz of gas into the spark plug hole. replace the plug and turn it over . This will get them to fire up. Good luck DFD

Apr 22, 2009 | RTO Pit Bikes

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

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