Question about 1978 Yamaha XS 650 SE

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Engine idles with choke on only

Yamaha 650 engine

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  • 93 Answers

You either have cracked intake boots/ manifolds or the idle circuit in the carb is plugged with stuff. Spray some brake cleaner around the intake manifolds (air box in place) and see if the idle picks up. If nothing happens pull the air box, fire it up and put your hand over the carb(s) to try to **** it through....rev it up...cover carb with hand...repeat. Next you're removing carbs and cleaning

Posted on Dec 17, 2008

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cape cod bob
  • 292 Answers

SOURCE: how to lower the idle on a 2002 yamaha 650 v-star classic?

under the left side of the gas tank you will see i black knob/screw at the end of what looks like a hose. the knob faces the rear of bike. that adjusts the idle. its real easy to find and the only adjustment you can make to the carbs.

Posted on Apr 02, 2009

  • 12 Answers

SOURCE: Yamaha 06' V-star 650 idle prolbem!

Fuel filter is located near the fuel shutoff valve within three inches. It is inline between the shutoff valve and the fuel pump (towards tank).

The fuel circuit is: Tank/Fuel Pump/Fuel Filter/Fuel Shut-off Valve/Carbs.

You first step is to check for fuel delivery to the filter. Make sure the bike is cool and no iginition sources are nearby. Disconnect the inlet line at the filter and turn key on and crank engine (to trigger fuel pump.) Do not try and start at this time (choke off).

If fuel is adequate to the filter, check the filter by blowing through it, it should easily pass air. Replace filter if questionable.

Next reconnect the fuel lines and remove float bowl drain plugs in the back of the carbs (2 per carb). If with key on and cranking fuel pours out of these ports then you probably have clogged fuel jets. If not then the float bowl needles / pipes could be plugged with varnish from dried fuel. You can try spraying carb cleaner into the fuel inlet to clear the varnish and then retest. Careful not to spray carb cleaner on yourself (wrap straw with a rag).

If you have good fuel flow to the carbs and bowls you probably have varnish plugging the jets. You should remove the carbs and clean them thoroughly.

Hope this helps,

Kal

Posted on May 18, 2009

MakisRC51
  • 408 Answers

SOURCE: when idling engine spits back thru carbs

You should check the valve clearances, camshafts timing and make a compression test on the engine too.
One or more of your inlet valves is/are either not closing entirely or they close but their stem is damage and it doesn't seal off the combustion chamber properly.

Posted on Jun 28, 2009

  • 1 Answer

SOURCE: i have an 81 yamaha 650 maxim that will only idle

just had that same prob and we cleaned the carb and works great but the rpm's go up and down from 1 to 3 u can ride but very unsafe why could this be?

Posted on Mar 30, 2010

  • 518 Answers

SOURCE: 82 yamaha maxim 650 engine is hard to start cold

weak mixture,dirty fuel,air leaks on induction manifolds,jets blocked,fuel tap filter chocked,float needles sticking,fuel level in carb incorrect,thottles not opening together,air leaks at exhaust pipe joints,

Posted on Jul 04, 2010

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1 Answer

My 1981 maxim 650 idles high. what is the correct idle setting and how do i adjust


Hi, Robertshenk and the usual suspects are:
1. Throttle cables improperly adjusted or pinched.
2. Idle adjusting screw needs to be backed off.
3. Intake system air leak.
4. Fast idle choke ramp is not releasing.
5. Broken throttle return spring.
6. Damaged diaphragm or slide.
7. Faulty MAP, TPS, ATS, O2, VSS sensors or wiring/connector
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.
82 Yamaha Maxim idles high
Xj650 HIGH IDLE puts itself to full throttle
Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf

Aug 31, 2012 | 1981 Yamaha XJ 650

1 Answer

1982 maxim 650 idles rough


Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke 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.
Yamaha XJ650 Idle Problem
1994 xj600 seca 2 rough idle
Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf

Aug 27, 2012 | 1982 Yamaha XJ 650

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

1 Answer

I have a 05' Yamaha 650 V Star and it will only run if the choke is fully out, hot or cold engine. If the choke is pushed in, it immediately dies.


Has the bike been parked for two weeks or more? If so, the fuel has most likely gummed up and plugged fuel passages and jets. Might try adding 1/2 to full can of SeaFoam to existing fuel in the tank, crank the bike and run (with choke if you have to) at a high idle for several minutes. Shut it down and let set for an hour or so allowing the SeaFoam to work. Start bike again and run at high idle again, trying to run it without the choke. If this doesn't work, then the carb probablyneeds a tear down and a manuel cleaning and reset.

Apr 13, 2011 | 2004 Yamaha V Star Classic

1 Answer

I have a yamaha xj650 maxim which was a project of mine and it will not idle below 2500 rpms. There have been many add ons though 4 to 1 exhaust free flow air filters clean carbs added stage 3 dyno jet kit...


I would recommend adjusting the idle screw on the carb. If it is not the idle adjustment, then check the choke as it may be sticking and that will cause the engine to idle at that rate.

Feb 28, 2011 | 1982 Yamaha XJ 650

1 Answer

I just bought a used 1982 Yamaha 650 Maxim. It had been sitting for some time and the Carburetors were badly varnished, so I went in and cleaned everything. I then replaced the badly dry rotted manifold...


You will have to check the float level of the carburators and hope you had used compressed air to blow out the jets!
Best still is to visit this site for more info...theres plenty in there for our type of bikes mine is XJ750RH.
Good luck.
www.xjbikes.com

Jun 23, 2010 | 1982 Yamaha XJ 650

1 Answer

82 yamaha maxim 650 engine is hard to start cold runs on choke and is hard to throttle up off idle will stall but an be featherd up but not easly


weak mixture,dirty fuel,air leaks on induction manifolds,jets blocked,fuel tap filter chocked,float needles sticking,fuel level in carb incorrect,thottles not opening together,air leaks at exhaust pipe joints,

Apr 11, 2010 | 1982 Yamaha XJ 650

1 Answer

My 2006 yamaha v star 650 will run with choke on but will not rev . the engine will not run at all with the choke closed . if you cover the air intake it will rev


You have a vacumm hose loose look for small hose no connecter to anything - should solve it - I had a similar problem with a ZX9r the other day - same would run fine on choke not idle or start without it

Good Luck

Del

Jun 29, 2009 | 2006 Yamaha V Star Classic

1 Answer

I wanted to know how to turn down the idle on my 1981 XJ 650 Maxim. Every time I come to a stop in first gear the engine races. At first I thought it was the choke. I don't know anything about motorcycle...


hello
if you were to look upward under the carbs, about center between the middle two carbs you should notice a screw with a larger head on it. this is the idle adjusting screw. hope this helps.

Mar 26, 2009 | 1981 Yamaha XJ 650

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