Question about 1988 Yamaha XV 535 Virago DX

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Just changed carb intake boots to clear up vacuum leak on my 85 virago 700 took it out for a ride and now it has a big power loss top speed about 50 at 4000 rpms any idea what might be wrong ?

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Sounds like a hose is in the wrong place go back and check all your hoses and make sure they are secure......or a hose has a leak in it that you removed when changing boots.

Posted on Oct 13, 2010

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1 Answer

Virago loses power on higher speed ?


I think the boots that is the rubber pipe going on to the engine from the carburettor

ay have a hole or not be sitting quite right , on the side of the engine ,you can test this quite easy ,turn on the bike idle it as normal ,then spray carb cleaner on and around the boots it will make the bike race slightly this means there's a hole and air is been drawn in so mix ratio is wrong so loss of power ,do this to both boots hope this helps

Dec 26, 2013 | 1994 Yamaha XV 535 Virago DX

1 Answer

85 virago 700 problem with high idle


is the air filter good, not restricting air flow, is the choke turning off ok

Mar 15, 2013 | Motorcycles

1 Answer

How do I fix a vacum leak on 2002 nissam sentra gxe


You have to find the leak and seal it up, hey. It may help to picture where vacuum originates in the engine: As the pistons move down in the cylinders they pull air in from the intake manifold. This creates a pressure drop in the intake, a vacuum that is maintained as the engine is running. New air that is pulled into the intake is measured by the Mass Air Flow sensor mounted in the big boot between the air filter and the intake. If extra air is pulled into the intake manifold from a vacuum leak, uncalibrated air, the computer can figure it out from the oxygen sensors reading in the exhaust-mixture is too lean, so the computer will try to compensate by delivering more fuel, but can't deliver enough, mix is still too lean, so computer sets a code for the vacuum leak.
The intake will have a few vacuum taps with hoses running to engine or car controls that require vacuum to operate. If one of the hoses comes off or has a leak, that is extra air into the intake. Your power brake booster has a large vacuum tap. That may be the problem. With the engine running, pull off that line and plug it, and see if engine speed changes. If the idle drops that may be your leak-a failed power brake booster.
If nothing yet, keep engine running and spray some starting fluid around the mounting area of the intake manifold (maybe the intake gasket has failed and sprung a leak) and listen for a change in engine pitch or speed. The fluid may get sucked into the intake and cause speed to change. If it does, you would need to remove the intake manifold and fit a new manifold gasket.
Also check the big boot from the air filter to the throttle body for tears or loose fit. Good luck, Rev!

Nov 30, 2012 | Cars & Trucks

1 Answer

Motorcycle has a lack of acceleration. RPMs go up as normal but the motorcycle moves as if you were on cruise control and holding the increase speed button. What else could be causing the problem? I have...


Hi, Andrews and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Inlet system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
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.
Virago 535 Starting and running problems
https://yamahaclub.com/forums/topic/11137-virago-535-loss-of-power
http://www.pedros.cz/Misc/Virago/XV535_dilensky_AJ.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2005/LIT-11626-18-21_1000.pdf

Jul 10, 2012 | 1993 Yamaha XV 535 Virago DX

1 Answer

Have a 1997 Yamaha Virago 1100 cc, started it for the first time this year and found fuel leaking out of my overfill line,so therefore changed oil and filter, spark plugs, not leaking as much now, but...


One thing you might check....not real familiar with Viragos....but if your bike has the vacuum petcock...make sure the diaphragm isn't leaking and your vacuum line isn't sucking fuel into the intake.

As for the floats...if the petcock is fine....sometimes tapping the flat bowl of an overflowing carb with the plastic handle of a large screwdriver will free the float.

Apr 07, 2011 | Yamaha V Star 1100 Custom Motorcycles

1 Answer

2000 saturn idling too fast,fixed egr valve,same problem


First thing to check on an injected engine with high idle is for intake vacuum leaks. Unmetered air entering the intake can cause high idle, as the o2 sensors add fuel to correct the mixture. The result of this is often a high idle. Spray carb cleaner around the intale and on vacuum hoses and connections. Don't forget the power brake booster, which is powered by engine vacuum. You don't mention engine size, however I've seen the rubber boots on the intake leak several times on the 3.0. Try not to do this carb cleaner test on an incredibly hot engine, and stay away from the exhaust. BE SAFE. Another method is to use propane to sniff out vacuum leaks. Either way, engine speed will either pick way up, or it will stuble badly when you find the leak, depending on location. Good luck!

Mar 14, 2011 | 2000 Saturn Ls 4dr Sedan

1 Answer

I have a 1998 Virago 250 in pretty good condition. I've been riding it for about 6 months and its started developing a firing/fueling problem. From cold it's become difficult to start, and when I try to...


You can check for intake leaks with carb cleaner. Spray a little near suspected areas and try to account for spray going in the carbs. A change in RPM is an indication of a leak.

Dec 12, 2010 | 2004 Yamaha Xv 250 Virago S

1 Answer

Two tubes leave carburator and goes to gas tank. One has come loose and I dont see where it goes


1 tube is a fuel line and 1 tube is a vacuum line

The big one is the gas line which goes to the petcock.

The smaller one is a vacuum line which also goes to the petcock.

That is a vacuum operated petcock, which works off the vacumm off the intake side of the carb.
the intake side is the engine side, the other side of the carb is airbox side.
There should be a nipple sticking out of the carb on top on the intake side.
If not then the nipple is on the intake boot itself, on top.
The intake boots are on the engine side of the carb and the airbox boots are the opposite side.

Nov 29, 2010 | Honda VT 250 F Motorcycles

1 Answer

Loses power at 4500 rpm, carbs are clean and has no intake leaks. has good sparkplugs an coils are working. front cylinder pops a blue flame consistanly after a few revolutions. exhaust seems colder on...


If your carbs and plugs are fine you may wish to check into you wiring harness to see if you have a cyclinder not firing due to a problem with wiring (frayed or disconnected).

Oct 16, 2010 | 1988 Yamaha XV 535 Virago DX

1 Answer

Hi,Hi Have a 535 xv 1999 their is a Lack of power


Hi, Chris25591 and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
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.
Virago 535 Starting and running problems
https://yamahaclub.com/forums/topic/11137-virago-535-loss-of-power
Yamaha XV 535 DX Virago Service Manual
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2005/LIT-11626-18-21_1000.pdf

Mar 05, 2010 | 1999 Yamaha XV 535 Virago DX

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