Question about 1982 Yamaha XJ 650

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1982 yamaha xj 650 maim will not idle, until it is run for several minutes,

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Hi,

They all do that :)

Posted on Mar 09, 2011

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My 1982 Yamaha 650 maxim begins to rev around 4,000 rpm after it warms up for under 5 minutes. I have tried carb cleaner. Can anyone help?


Hi, Anonymous 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.
Xj650 HIGH IDLE puts itself to full throttle
HELP My bike idles at 4000rpm
Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf

Sep 02, 2013 | 1982 Yamaha XJ 650

1 Answer

I have a 1982 yahama 650 hard to start cold if you spray carb cleaner on a rag & cover the intake it will start & run. But you can crank & crank otherwise. It fires & runs for 10 to 15 secs...


There were a couple of different carbs fitted to this era of bike. One of them has a diaphramme that works a 'fuel pump' system and floods the carb as the throttle is opened. They will split and cause problems.

Mar 06, 2011 | 1982 Yamaha XJ 650

1 Answer

I have a problem with the idle speed when my 1982 XJ650 heats up. When I engage the clutch, the RPMs shoot up to about 3000-3500 and even higher. When the bike is cold, the idle is perfect. Once I ride...


Hi,

Hope this doesn't reach you too late. These bikes take some time to fully warm up.

You can adjust the idle down by turning the knob between the #2 and #3 carburetors counterclockwise until you reach 1050rpm. Wear a glove or you will burn your hand!

Ride the bike some more, and see if the idle stabilizes. If not, you may have a vacuum leak somewhere.

A quick way to diagnose this is to take a propane torch (NOT LIT!) and run it around the carb boots and vacuum caps. If there is a change in rpm, then inspect the boots and caps for tightness and cracks.

Sep 06, 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

1982 XJ 650 maxim cylinder 2 & 4 won't run


Are you saying that 2 & 4 got gas with external tank but not with gas tank? If so something else has happened ,if gas is getting to the carb it cannot by-pass 2 to get to 1. Take the tank back off ,connect to external, again. See what happens.

Sep 11, 2009 | 1982 Yamaha XJ 650

2 Answers

Valve clerance for yamaha xj 650,what is the clerance of exhuse and intake?


xj650(uk) and xj650j
inlet 0.16 - 0.20mm
exhaust 0.16 - 0.20

all other models
inlet 0.11 - 0.15mm
exhaust 0.16 - 0.20mm
set when cold

Dec 23, 2008 | 1982 Yamaha XJ 650

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