Question about 1999 Yamaha YZF-R1

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Hi there I have a r1 99 4XV and the engine spins when I try to start the bike but wont start I check the fuel pump and clean all the fuel hoses, can anyone help. Cheers

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Have you checked your spark plugs and wirings?

Posted on Apr 26, 2010


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Harley problems

This sounds like a known HD problem involving the temperature sensor at the top of the engine. As it heats up the fuel management system FMS leans out the mixture. This is OK, but the HD FMS does not know when to stop. It will lean the mixture out until the bike does not run. But it could be a problem with the fuel pump suction hose.

When the engine stalls, is the fuel pump running like mad or not?

If the pump is running like the tank is empty, replace the fuel filter and the fuel pump suction hose.

If the pump is not running like mad, I'd go with the temperature sensor problem. Start with the easy stuff:
  1. Be sure the air flow over the engine is not blocked.
  2. Check the electrical connections at the sensor.
  3. Try the bike
At this point it starts involving money. You can consider having the dealer put the compute on it and see what they can find.

But if you are like me:
  1. Replace the top sensor. It is as much work to remove the old sensor and clean up the ground connection as it is to replace the sensor
  2. Try the bike.
  3. Replace the FMS. After market FMS that know when to stop leaning out the mixture are available at places like J&P Cycles.
  4. Try the bike.

If it is not fixed at this point you really need the computer analysis.

May 15, 2014 | 2006 Harley Davidson Dyna Glide Low Rider

1 Answer

My Yamaha YBR 125 2007 not starting, it been standing for 2 years, I have cleaned tank, all hoses, filter, fuel injector.

Hi sounds like your nearly there ,try swapping hose around ,I once mixed the in and out ,next did you take the carbs apart and clean ,also a small shot of wd 40 in to the fuel pump without hose connected then pour out ,from what I read sound pretty good kid best of luck

Apr 12, 2014 | 2007 Yamaha Ybr 125

1 Answer

Hi i have a 4stroke 125cc pit bike it wont start tried bump start sorted turned over but when i reved it didnt respond then died any ideas

Tryd go to auto shop and check the carburator of your motor and clean your air filter adjust air setting in carburator and put a new fuel pump check fuel setting in carburator

Jan 18, 2014 | Motorcycles

1 Answer

Accidentally disconnected fuel line from tank during cleaning. i connected it back but now wont start. its like it is not getting fuel. can you help.

Your bike is equipped with a vacuum operated petcock. There is a fuel hose and a small vacuum hose on the backside of the bike. Vacuum generated by the engine when it is in operation opens the fuel petcock. Make sure that you didn't knock that vacuum line off as well. You can take the fuel line off the petcock and spin the engine to check for fuel flow.

Good Luck

Aug 21, 2011 | 2001 Harley Davidson FLSTF - FLSTFI Fat...

3 Answers

When i try to start my bike up it wont go, just wont fire, checked everything it has spark ect...some days it will go fine, but other days it wont, when i get it going it runs fine, if i turn it off and...

check the air filter if its clean take the carb apart and clean it with something like b-12 or i use wd-40 on my bike so it wont eat the rubber gaskets

Jun 09, 2010 | 1991 kawasaki ZXR 750

2 Answers

Bike wont start

I posted this for a similar problem, maybe it can help. Are you sure it's getting gas to the carbs? Some people don't realize the 99-02 SV650 has a vacuum-actuated fuel pump, and sometimes it can get stuck. Mine has had this problem, and it took me a while to determine it was the problem. I would guess it only happens after the bike has been sitting a while (ours unfortunately sat for a year or so without being run).

Best way to check it is to lift the tank (it's bolted to the frame on the right side of the engine just under the tank). Unplug the line toward the front of the motorcycle from the fuel pump, and connect some spare fuel hose to it running to a can next to the bike (don't want to get gas everywhere!). With everything else still connected, crank the bike for a short period to see if any fuel comes out (shouldn't take long). If not, then move backward and ensure fuel will flow from the vacuum-petcock when the bike is cranked. If that does work, your fuel pump needs some work. I was able to take mine apart and unstick it.

Aug 03, 2009 | 2001 Suzuki SV 650

2 Answers

1999 road king wont start

Its your fuel pump if you can't hear it. And its inside your tank. Not a hard fix if you have a book that tells you how to remove it. Alot of procedures to follow to get it right. And yes it does work off a relay.

May 30, 2009 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

Bike wont start and fuel comes pouring out.

Hi, Please don't shoot the messenger, I have a royal star and this has happened to me more than once. The carbs are gummed up from sitting and you have to take them apart and clean them. The fuel pump is overfilling them because the float needles are stuck and the main jets are gummed up. The fuel is coming out the overflow hose. Sorry!

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Mar 28, 2009 | 2003 Yamaha V Star Classic

1 Answer

My 2007 Harley Davidson Nightster won't start.

try disconnecting the fuel hose at the tank end its a simple thing to do , push the collet up and pull the hose down then switch the ignition on try to strt the bike , just spin the engine over a couple of time ( dont worry no fuel will spill out ) then reconnect the hose , then try to start the bike , hopefully that will cure it , sometimes the connector gets gummed up ,
hope this helps
kind regards

Mar 19, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

2 Answers

Whirlpool front loader washing machine (AWO3361) WONT DRAIN

Remove drain hose from where it connects to the plumbing under the sink/tub. Inspect the spigot. If clogged, clean. If clean, then tilt machine back and remove drum to pump hose from pump. Check hose and also drain pump. Clear any obstructions.

Nov 03, 2007 | Washing Machines

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