Xr600r is hard starting when cold.

if it runs then the plug is not the problem
what is the problem is the carby
check that the choke is operational;, the float level is at the right level, and the ignition timing is correct

G'day mate the 1st thing i would go for is float level then compresion if it does have the **** it wont take the fuel in , rules are if it has **** ( induction ) Squeeze (compression) Bang ( spark) and Blow (free exhaust) then it should go, if it was running to lean there is good chance it has a burnt exhaust valve which will greatly drop the compression/induction, also check the valve clearence. hope this helps

1. First thing is when was the last time you had your valves adjusted
2. On cold start up twist about 15 times on your throttle, as you do that the accelerator pump in carb will shot gas in cylinder, I have a 2003 yx426 & 2005 yz450 have to do to both of them when cold out to get started

Hello,
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day. -Steve

Kinda sounds like the ECM or "start mixture" control module is faulty or is getting a bad input from a sensor. For example, it man not be getting a proper temperature sense from the exhaust manifold or the intake manifold water temp sensor. So, every start seems like a cold start....

If your cold start is on a "cold" engine - fine. If your cold start is on a "warm" engine - problem. Mixture is too rich for a warm engine.

Again, could be sensor sending a bad temp signal... or the control module not responding to the signal.

A bit too complicated a problem to exactly troubleshoot via long distance... but you now have a starting point.... -Jim

I believe you have a throtle body correct? IF so you have poor fuel pressure, plugged filter of injector.If by some miracle you have a carberated engine the the fuel is leaking from the bowl. Get a carb rebuild kit.

jlwhelen,
I will suggest that perhaps the blue smoke is not purely oil. It sounds like you may have an ignition problem where the engine has a hard time firing until warmed. The blue smoke may be, at least in part, unspent fuel. I realize that a warm engine that uses oil will smoke blue, but excessively rich conditions on startup can result in a similar effect. If the choke circuit is delivering a little extra fuel from a dirty injector, the problem may be worse when starting from cold.
To remedy this, I would suggest a simple replacement of plugs and wires, as well as a fuel injector cleaner through the tank. I would bet money that these simple maintenance points would solve your problem.

Good luck!
Lucky

You may have a CTS (Coolant Temperature Sensor) problem. If the coolant level is low the CTS could be sending a false signal to the ECM or the CTS may be faulty. The CTS must be in coolant to provide an accurate signal to the ECM and if the coolant level is low then the ECM thinks the engine is cold and therefore provides a rich air/fuel mixture. This, in turn could be the cause hard start (evident by black smoke from the exhaust), and could be the reason the vehicle failed the emission test.

i melted my module off of mine 89 gta once on my disturbertor and also had the plugs that snaps onto the coil pack cause a lot of problemns because it wasn't snapped all the way don on the coil pack not the plug wires but the wiring harness plugs and it gave mne a lot of problems.may want to check yourself took it to a dealer ship 4 weeks in a row and every time they said it was fixed i drove it for a couple hours and it would quit and not start and that was all it was but it started with a tune up wires, cap ,rotor button.

How old is your Battery? at the Temp. Stated above an Older Battery even though Good may not have Enough Cold Cranking Amps Left to Kick her Over.