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liv2ride

hard to start cold, pilot jet?

32 posts in this topic

05 wr450, ALL the mods plus JD jetting kit and pro circuit 496 can. runs like a scalded dog once i get it started the first time. fuel screw set at 2 turns out, have tried 1.5 and 2.5 turns out but doesn't help. it requires the use of the cold start circiut after it's warned up to restart it.

the question is... do i need to go to a fatter pilot jet?

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Starter jet is the choke circuit and pilot jet meters the 0 to quarter throttle range jetting richness.:cry:

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I tried to start my 05 by using the kicker and about killed myself, I tried off and on for almost an hour and it didn't even act like it wanted to fire.

When its cold out (40's) it will start after laying on the e start for a minute or so, after the engine is hot it will start without the choke but only if its within 20 minutes or so, if it sat for 1/2 hour or longer you have to use the choke.

I have a Yosh pipe but it was the same exact bear to start before I installed the pipe, and I had the dealer do the throttle stop before i picked it up.

The bike has 40 miles on it.

any idea's?

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72 starter jet for cold starts. :cry: 48 pilot will also help on hot restarts.

Just do it and make your bike easier to start! This is a proven set up on the WR450 developed 2 years ago by TT members!:cry:

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Change the jets, it really helps.Also i have found that turning up the idle speed will help in starting especially in the cold.If it revs to much ince going just wind it back.

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I have a 99-WR400, will rejettting also help my cold start? I have no elec. and man that thing can tier me our on a cold day.

Also I've been looking into the P-38 mod. Will changing the accelerator pump cover improve starting as Factory R&D claim? Anyone notice a difference?

Thanks.

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05 wr450, ALL the mods plus JD jetting kit and pro circuit 496 can. runs like a scalded dog once i get it started the first time. fuel screw set at 2 turns out, have tried 1.5 and 2.5 turns out but doesn't help. it requires the use of the cold start circiut after it's warned up to restart it.

the question is... do i need to go to a fatter pilot jet?

What part of Texas are you in???

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I have a 99 WR and it starts fairly easily down to –35. I ordered richer jets but the starter jet was backordered and I never did reorder it since I can still start the bike, although it probably would help.

With stock jetting, here’s what I used to do. Pull out the choke and wind in your idle knob about 1 full turn. Depending on the temperature, give the engine a few squirts of fuel by full twists of the throttle grip. For 32 F try 5 slow full twists. Then take your hand off the throttle, place it on the handlebar crossbar so you have something to hang on to and kick. I found that the first kick usually wouldn’t do anything but the bike would fire on the second kick. It might only run for a second or two and then quit. Usually grabbing for the throttle to keep it running would only make it stall. If it quits set up again like before with 5 squirts of throttle and then kick and it’ll run a few more seconds than before. Heat gradually builds in the engine until it will stay running. At 32 degrees it may stay running the first or second time. At –35 I usually have to start 8 to 10 times before it will stay running.

The 3 most important things are turn up the idle, squirt gas in with the throttle first, and do not touch the throttle grip when you kick no matter how steady you think your hand is.

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ditto on the few twists of the throttle. on a cold morning, it'll make all the difference in the world.

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............For 32 F try 5 slow full twists. Then take your hand off the throttle, place it on the handlebar crossbar so you have something to hang on to and kick. I found that the first kick usually wouldn’t do anything but the bike would fire on the second kick. It might only run for a second or two and then quit. Usually grabbing for the throttle to keep it running would only make it stall. If it quits set up again like before with 5 squirts of throttle and then kick and it’ll run a few more seconds than before. Heat gradually builds in the engine until it will stay running. At 32 degrees it may stay running the first or second time. At –35 I usually have to start 8 to 10 times before it will stay running.

The 3 most important things are turn up the idle, squirt gas in with the throttle first, and do not touch the throttle grip when you kick no matter how steady you think your hand is.

You really need a bigger starter jet. Indy knows what he is talking about. My bike used to start exactly how you described above. I asked Indy about jetting and it is a huge differance. With the starter jet it starts up sooo much better. It may stall but usually only once then its running. I can get starter jets any day of the wek here in Mich. If ya want I can send ya one for the price of the jet and a stamp. It really helps.

I keep preaching the same thing that INDY is selling and people just dont seem to listen. INSTALL A BIGGER STARTER JET IN THE WINTER AND IT WILL START!

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Hey Don (yzman400)! Thanks for the back up! :cry: Did you ever pick a good week to go to florida! :cry: It has been nasty cold up north! :cry:

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Indy, have you got the part number for the starter jet? Also does Yamaha call it by a different name? I can't find a starter jet in the parts diagrams.

Thanks,

Joe

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Treebark posted the following a while ago: :cry:

MAIN JETS

4MX-14943-42-00 .JET, MAIN (#175) AP 1

4MX-14943-40-00 .JET, MAIN (#165) STD 1

4MX-14943-91-00 .JET, MAIN (#168) AP 1

4MX-14943-41-00 .JET, MAIN (#170) AP 1

4MX-14943-92-00 .JET, MAIN (#172) AP 1

4MX-14943-93-00 .JET, MAIN (#178) AP 1

4MX-14943-89-00 .JET, MAIN (#158) AP 1

4MX-14943-39-00 .JET, MAIN (#160) AP 1

4MX-14943-90-00 .JET, MAIN (#162) AP 1

4MX-14943-88-00 .JET, MAIN (#152) AP 1

4MX-14943-38-00 .JET, MAIN (#155) AP 1

PILOT JETS

4MX-14948-06-00 .JET, SLOW (#48) AP 1

4MX-14948-04-00 .JET, SLOW (#42) STD 1

4MX-14948-05-00 .JET, SLOW (#45) AP 1

4MX-14948-07-00 .JET, SLOW (#50) AP 1

4MX-14948-01-00 .JET, SLOW (#35) AP 1

4MX-14948-02-00 .JET, SLOW (#38) AP 1

4MX-14948-03-00 .JET, SLOW (#40) AP 1

STARTER JETS

3TJ-1494F-13-00 .JET (#65) AP 1

3TJ-1494F-12-00 .JET (#62) AP 1

3TJ-1494F-14-00 .JET (#68) AP 1

3TJ-1494F-15-00 .JET (#70) AP 1

3TJ-1494F-16-00 .JET (#72) STD 1

3TJ-1494F-17-00 .JET (#75) AP 1

3TJ-1494F-20-00 .JET (#82) AP 1

3TJ-1494F-18-00 .JET (#78) AP 1

3TJ-1494F-19-00 .JET (#80) AP 1

PILOT AIR JETS

7A9-14943-27-00 JET (#100)

7A9-14943-17-00 JET (#75)

LEAK JETS

4JT-1494F-19-00 .JET (#80) AP 1

4JT-1494F-15-00 .JET (#70) STD 1

4JT-1494F-23-00 .JET (#90) AP 1

4JT-1494F-03-00 .JET (#40) AP 1

4JT-1494F-07-00 .JET (#50) AP 1

4JT-1494F-11-00 .JET (#60) AP 1

4JT-1494F-27-00 .JET(#100) AP 1

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Hey Indy and yzman, I read what you said about the 48 pilot and 72 starter jet. Went to the shop and picked them up and wow, what a difference. :cry:

Thanks again, Brock.

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Hey Indy and yzman, I read what you said about the 48 pilot and 72 starter jet. Went to the shop and picked them up and wow, what a difference. :cry:

Thanks again, Brock.

You guys with new 05's and starting issues can see that jetting is very important for easy starting! :cry:

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