Question about 1998 Yamaha SZR 660

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Electric fuel pump

I've had ongoing problems with the vacuum fuel pump on this bike. When left for even a couple of days, the pump seems to darin down causing it to air lock. If you remove the vacuum pipe, ****/and blow into it you can hear air bubbles go thro the petrol in the tank. I'm thinking of replacing it with an electric pump. Any suggetsions from anyone on this idea? If I go ahead, can anyone suggest pump pressure, flow rate, etc...?

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  • Yamaha Master
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Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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.
Yamaha SZR 660
MZ MuZ Riders View topic Fuel Pump
Yamaha SZR 660 Service Manual
OEM parts for Yamaha

Posted on Dec 17, 2016


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Posted on Jan 02, 2017

  • 331 Answers

SOURCE: 95 xv750 Virago fuel leak

Probabilly a stuk carburettor float or needle.
Try to solve this problem to gently tap on the carburettor bodies. If this doesn't help you have to clean out the carburettors, and/or replace the float neeldes

Posted on Apr 02, 2009

  • 3567 Answers

SOURCE: Fuel Problem Yamaha TZR250ma

The gas petcock (valve) is letting gas get past it even when it is turned off.

Posted on May 05, 2009

  • 677 Answers

SOURCE: Ive changed my rear m/bike

2 things
The valve needs replacing or
you have a damn big hole in the tyre

Posted on May 12, 2011

  • 3567 Answers

SOURCE: Canadian bike 1991 Yamaha fj1200,50,000kms.

Chances are there is a water build up in the carb float bowls. The water comes from condensation in the gas tank. Try draining the carbs. Another possibility is carburetor main jets partially plugged up. You must clean the carbs if plugged jets are found to be the problem. Please rate my answer. Thanks. tombones49_152.gif

Posted on Jun 02, 2011

Mr BrokRench
  • 1623 Answers

SOURCE: While riding i feel missing

Check for a vacuum leak, you have a lean condition.

Posted on Jul 25, 2011

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I recently had my carbs cleaned and adjusted.Bike ran fine for two days.Then one morning i had trouble keeping on,it turned on but would turn off even with choke and reving it. the next day bike wouldnt...


Feb 03, 2015 | 2001 Suzuki GSX 600 F (Katana)

1 Answer

Fuel tank petcock vacuum operated

What exactly is the problem with the petcock? If it is a vacuum operated petcock and it is no longer allowing fuel to the engine check the following:

First, did you work on the bike prior to the problem occuring, and was the bike running properly before this? On bikes I've owned with vacuum petcocks, the petcock has two rubber hoses attached to it. One is the vacuum line the other is the fuel line. On one of my bikes these hoses were nearly identical in size and I managed to swap them a couple times after having the tank off the bike. Simply double check that the hoses are connected properly. If they are not, the bike will run until the fuel is run out of the float bowls then die.

Second, do you have an inline fuel filter on the fuel line between the petcock and carb? If so check it to make sure it is not clogged.

Third, remove the tank and check the entire length of the vacuum line for the petcock. Is it kinked, pinched, cracked, cut, detached, etc.? Look for anything which would prevent the line from providing vacuum to the petcock.

Fouth, test the petcock to see if it is working properly. To do this you will need a handheld vacuum pump, such as a Mityvac (you may be able to get a free loaner from some autoparts stores). remove the vacuum line from your petcock and attach the vacuum pump to it. It should only take one or two pumps to create enough vacuum to open the petcock valve. If fuel begins to flow the petcock is good, if it doesn't you could have a clogged filter screen in the tank, but most likely the petcock's vacuum diaphram is damaged. The Baha is a Chinese made bike and it's possible the rubber parts in the fuel system are not compatible with the ethenal fuel blends here in the U.S. The dealers who sell these bikes are really hit and miss when it comes to being able to provide replacement parts. Even with the internet, it may take some work to locate a correct replacement petcock for the bike. On the bright side, if you are able to get a new petcock, they are very easy to replace.

Good luck!

Nov 29, 2013 | 2011 Bajaj Pulsar 150

1 Answer

I've adjusted the float and checked the needle seat [found gas in my oil ] but will not start-checked for spark thinking that it has jumped timing how do I check timing? also what about vaccume on...

The timing on your bike is set automatically by the computer and cannot "jump", not even on the older models. There is a crankshaft position sensor on the left front of the engine case that senses the position of the crank. Since your bike is equipped with a carburetor, it has a fuel petcock. This petcock is operated by manifold vacuum. The vacuum line connects to the backside of the carb. Make sure it is connected at the carb and to the backside of the petcock. To check the petcock, you must have a hand operated vacuum pump. Disconnect the fuel line, connect the vacuum pump to the vacuum nipple on the backside of the petcock and apply vacuum. Fuel should run out of the fuel line. If not, you need to replace the diaphragm in the petcock. Personally, I'd replace the petcock with a high quality manual petcock like a Pingel. You'll have to turn your fuel on and off manually, old school but it won't give you any more trouble.

You can take an oil squirt can and put some fuel in it. Remove the air filter and squirt a couple of shots of fuel in the mouth of the carb. Try to start the engine. If it starts or fires a couple of times, then you know the spark is fine. If you get the engine to run long enough, it will allow the carb to fill with fuel and it may run on it's own then.

May 09, 2011 | 2006 Harley Davidson FXDLI Dyna Low Rider

1 Answer

I have a '06 zzr600


Some bikes have a vacuum petcock. Whenever the bike started up the petcock opened itself up and whenever it shut down, the petcock shut down too. Check to see if the petcock is set to on. Check to see if the fuel line is hooked up. Check to see if you have a vacuum line, and if it's hooked up. Check to see if the gas tank were possible vacuum locking due to a clogged vent. Alternately haul off the carbs and clean them out. Check to see if the fuel filter is clogged. Also after cleaning the carb and refitting it you will need to add vacuum to that fitting. It is a safety devise to shut the fuel off to the carb. In case the rider forgets a small hand vacuum pump from harbor freight will do the job just fine

May 04, 2011 | 1993 kawasaki ZZR 600

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I have a 2009 kawasaki klx250s. After starting the bike and warming it up to the recommended time in the manual as soon as i go to accelerate the bike it hesitates and the rpm's will back down sooo far to...

Fuel pump (if you have one) weak or has trash that can move . intermitten short, make sure all fuses are tight not just look good. Probably a re-occuring problem with trash or water in fuel.(fill fuel from clean fuel can ) If it was trash and cleaning carbs made a difference, clean tank filter and lines too.

Mar 27, 2010 | 2007 kawasaki KLX 250

4 Answers

Bike was running zx6r f2 model 1996 no bother now wont start got spark cleaned carbs,but wont go even with easy start doesnt seem to be taking in fuel even though the carbs are filling up checked valve...

hello this is only a solution

try putting a new float in the carb and check that it isnt flooded or the carb housing is cracked because it could be sucking in air some where and make sure its the right carb for the bike

if this dosent work the cheapest way it to make the valve clearance right as it says in the manual then try it if still not try bumping the bike if this dosent work just ask again

thanks hope it helped

Dec 06, 2009 | 1996 kawasaki ZX-6R Ninja

1 Answer

2003 gsxr 600 electrical problem

check corroded wires at connector of the left hand switch coupler

Jun 03, 2009 | 2003 Suzuki GSX-R 600

1 Answer

Breaking Down

The problem may be a pinched fuel or vacuum hose, or a weak/collapsed vacuum hose. The problem may be varnished fuel/carburetors.

It may be an electrical problem: loose connector or defective conductor.

I cannot help you other than this without having the Duc and performing a few tests. The Monsters are fun to ride.

Nov 10, 2008 | Ducati 996 Motorcycles

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