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Blue Needle in Hot Weather???

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The temp is running in the 90's now and I was wondering what the consequences would be running Blue #3 instead of Red #5. I've been dealing with the dreaded bog for a long time, so I'm going back to Square 1, i.e. stock jetting and changing one item at a time to see where the improvements are.

I've been running a 48 Pilot/100 PAJ/165 Main/35 Leak/Red #5/Boyesen Quickshot/Full FMF System/Free Mods/PowerNow/Open Airbox/Zip-Ty FS. With all of this, my idle was hunting and I had an off-idle bog if I wacked the throttle too fast.

I ride in the lower 5000' range primarily, so the JD Kit instructions call for a 168 Main and Blue #3, but I'm not sure due to the high temps. My main concern is getting rid of this damn bog without richening things up too much to the point that I start fouling plugs. I thought I had a handle on the whole jetting issue, but I've decided that I've been in the dark more than I originally figured...SC

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If the jetting seems fine other than when you crack the throttle, then I'd start with the leak jet. I think the quickshot lenthens the ap squirt about the same as dropping 5-10 on the leakjet. With 35 leak jet + quickshot you may be too long on the ap squirt. I used a 40 leakjet on my yz250f and it was a little too long. Then when I added the quickshot it was way too long and I had to go back to a 60 leakjet. No bog. Have you timed the AP?

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I've always run the blue needle in the summer in my 250. I've never had a problem, but I've never experimented with the red on either, so I may be missing something. I don't have any bogging, but I chalk that up to proper AP squirt and timing.

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I've timed it again and again to the manual's specs. Perhaps the combo of the Quickshot and the 35 or 40 leak jet is the issue. I'll give that a shot first...SC

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i thought the blue needle was for cold temps and red for hot 🙂

maybe try red #3 pos

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I switched from blue in the winter, red in the summer and haven't skipped a beat.

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The temp is running in the 90's...

I've been dealing with the dreaded bog for a long time...

I've been running a 48 Pilot/100 PAJ/165 Main/35 Leak/Red #5/Boyesen Quickshot...

and I had an off-idle bog if I wacked the throttle too fast.

I ride in the lower 5000' range primarily

Clark4131,

The temperature and elevation need leaner jetting, both on the pilot jet and needle, and possibly the leak jet. The stock #45 pilot jet and red neeedle in middle clip will lean your jetting to a better performing combination. The main jet does not need a change with the other corrections. A #35 leak jet is excessive with the other changes too.

-The pump cover, which has a minimal effect, will not solve your bogging condition. The cover "might" add 10%, but dropping from a #50 leak to a #35 is going to increase pump flow by about 50%. Check and time the pump flow to confirm. The #35 leak will flow about 1 second with either pump cover. The stock #50 will pump for about 2/3 second, again, with either pump cover.

If you need additional help, feel free to send an email.

Thanks,

James

JDJetting@comcast.net

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05 wr 450

elevation 4000-8000

temp 70-90

JD red #4

pilot 45

main 168

Pas 1 1/2

I can not remember the leak sorry

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