Question about 2002 Yamaha XJ 600 Diversion S-N

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My bike does not work when it's cold

It dies during the first 30 minutes though I've got the choke in,
I can't go fast despite high reving
it kind of splutters
after the motorway I have no problems at all

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  • 137 Answers

Hi,,is the fuel consumption hi,,as in its usin quite a lot,,to me it sounds like u have a air leak ,,either your air box is not seated on the carbs properly and loose,, or it has been known 4 one of the inlet air caps to be missing u will find them ,between the carb and the cylinder head,,the inlet rubber that connects them, u will see a rubber cap,if u can see a brass looking air pipe then the caps missin,,and that will **** air in and splutter ,,even if theres a hair line crack in the rubber that will **** air to,,

Posted on Dec 27, 2008

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1 Answer

High revs cold


manual choke lever raises the engine reves to warm the engine by lifting the needle height and making the mixture rich, warm the bike up before moving off.

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After my bike warms up good it gets real sluggish. It takes about 15 minutes for this to occur. When it happens I have to rev the bike real high or it will die out like its not getting or getting to much...


You didn't say what year or model your bike was but if it runs better when it's cold than it does when it's hot, this is an indication that it's running rich. Does the bike start up and idle without the use of the choke or very little use of the choke? If so, another indication that it's rich. Take the air filter cover and element off, leave the backing plate on, and take the bike for a ride. If it runs better, yet another indicator that it's running too rich. What type of carb is on the bike? This is unusual as most bikes,unless they've been rejetted, are jetted lean and have a nasty habit of spitting back from the carb.

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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.

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1 Answer

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sounds to me the valves are not properly adjusted,..like their to tight,...i had run into this in a japanese car once,...check it out and let me know,.....cracklin joe

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1 Answer

Hi, I?ve got an 88 K75S which runs well but when cold has problems starting. My local mechanic has had a look and can?t find the problem. The battery was changed 3 months ago, new plugs have recently been...


your BMW75 has a cold start sensor fitted to its fule system the choke leaver dose nothing but raze the reves a little its not a choke,,,thats withing the fule system if the sensor is not working right it wont tell the fule pump to enrich the fule mix and it will be hard to start from cold,,also if you start the bike up you must run it till its hot or the choke will stay on and flood up the engine the next time you try to start up
the choke sensor is in the water jaket, try changing this part first

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2006 Suzuki Boulevard C50 engine dies


Even though you probably don't have that many miles on the bike, or if you do have a lot riding time on it, it sounds to me like you need a valve adjustment. That's a high reving bike for that engine that works pretty hard so you might have 1 - 3 loose valves.

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1 Answer

Motorcycle starts up and after a few minutes dies out


a few things to look at....make sure the fuel pump is working ,is the fuel in the filter ,check choke/cold start is not sticking and not choking the bike,

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1 Answer

Last time I STARTED MY VSTAR 1100 I CHOKED IT FOR 10 SECONDS ON HIGH THEN MOVED TO MEDIUM CHOKE FOR 4 THEN TOOK OFF AT NO CHOKE. 2 WEEKS LATER. I started up bike Choke on high bike barely wanted to idle...


Sounds like your flooding it out with the choke out. Try the next time you go to start the bike when it's cold with the choke out and when it starts push the choke all the way in and keep it running with the throtle. If it runs better after doing this then your flooding it on start up. Use 1/2 choke to start cold and see what it does. Good Luck

Sep 29, 2009 | 2001 Yamaha V Star Classic

1 Answer

COLD MORNING


no doubt this bike is running very lean at idle. Thats the way the EPA wants it. Im a harley mechanic and i used to work in a US dealer. all carb bikes at set up time had the carbs "readjusted". We drilled out the EPA plug and turned the idle air screw out and drilled out the pilot jet too. The bikes worked much better. we were at sea level too so the bikes were very lean from the factory. I can imagine that after the new legislation that came into force they are even leaner and require a full warm up to run properly. Warmed up means you put your hand on the motors head and its hot enought to have to jerk it away. this could take more than a couple minutes. and yes our "readjustment" was illegal. i advice you to do the same.

Nov 20, 2008 | 2004 BMW R 1100 S

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