All of a sudden hard starting

Help please, all of a sudden the bike has become almost impossible to start. I have an 03 WR450. It has a yz cam, rekluse clutch, all free mods complete. I just switched from yamalube to Delo 400. I also switched from the blue to red needle(4th position) JD jet kit( for the winter). I am wondering if I should go back to the blue, or switch back to the yamalube oil. I am in South Carolina by the way(for elevation purposes). And forget about the e button, it has never worked when starting cold, after the bike is warm it will start with it (sometimes). Kicking used to always be a breeze but now it's a night mare, 20-30 kicks to get this thing to fire now. Any suggestions would be "greatly" appreciated. I won't even ride as much as I'd like to because of the pain in the neck to get the bike started, and I just finished building a 1/4 mile track in my back yard. Thanks.

Check your valves, I'll bet you have some tight ones. Hard starting is a tell tale sign...SC

Orange man, Is the outside temps pretty cold right now??

Does it start and stall like 10-15x before finially staying running?

If so you need a bigger starter jet. Its a little sucker right next to the main and pilot. I go from a 65 to a 72 on my YZ400 in the winter when the temps get below 30deg. Makes a HUGE differance for cold starting.

Some will say to just give it a few more squirts of gas. But that is just a bandaid for a lean choke circuit. The bigger starter jet will fix that. You can easily fowl a plug by giving it too many squirts of gas in the winter months. The starter jet is a better cure.

I also switched from the blue to red needle(4th position) JD jet kit( for the winter). I am wondering if I should go back to the blue, or switch back to the yamalube oil.

Blue needle is for winter. The red needle is for summer! :bonk:

Delo 400 oil is what I use and there are no issues. Cold weather try a 72 starter jet as well. Blue needle in clip #4. :thumbsup:

The part about the needle switch didn't register with me :thumbsup: .

Go back to the blue until the swallows return to Capistrano...SC

When was the last time you changed your plug? I've noticed they can slowly lose their kick, and then all of a sudden they die.

Get a valve adjustment. I had the same problem last fall with my '03 WR450. Since the valve adjust she fires right away.

Also, try getting a replacement battery from AutoZone. It was only $29.00 and cranks alot better, and you get a warranty on the battery. Search the forums here for the battery part #.

Get a valve adjustment. I had the same problem last fall with my '03 WR450. Since the valve adjust she fires right away.

Also, try getting a replacement battery from AutoZone. It was only $29.00 and cranks alot better, and you get a warranty on the battery. Search the forums here for the battery part #.

$29.00 I will take two to go with a large Diet Coke, No Ice.

Damn that is cheap.

Check your valves........ :thumbsup:

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