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RC81

Is anyone happy running the stock jetting on their 05 ?

25 posts in this topic

Just picked mine up on Sat. and havent ridden it much. Dealer did the stop and grey wire and I removed the pipe in the silencer.

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My dealer did the free mods and as far as I can tell, it runs perfectly with the stock jetting. Absolutely no hiccups anywhere in the powerband. I've ridden it 3 times for a total of 36 miles. Climbed some seriously tough hills too, can't say enough about the power as I came off an 03 WR 250.

Who knows, maybe after a while, I'll want to coax some more hp out of it, but for now it's just awesome.

Installed the Utah skid plate and the Unabikers this weekend, both fit perfectly. Really like both products as they fit so clean and tight.

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The only thing I have touched on my carb is the choke. Exhaust peashotter removed and AIS removed. This bike rocks the rockies here in Alberta with stock jetting. I put unibiker on days ago. Nice fit. Running a White Brothers E-Series pipe this weekend. May change things or maybe not. Sounds absolutley incredable with the spark arrestor removed. No noise laws here (yet)!

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I had major problems with the standard jetting. Once it heated up the idle would race all over the place, it boiled on technical hills. I didn't realise it was too lean causing these problems. Since installed a JD jetting kit and transformed the bike, highly recommended.

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I had major problems with the standard jetting. Once it heated up the idle would race all over the place, it boiled on technical hills. I didn't realise it was too lean causing these problems. Since installed a JD jetting kit and transformed the bike, highly recommended.

Great point! :) Stock jetting is hard on the motor on hot days and slow technical riding. Proper jetting really fixes overheating issues. :)

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Mine seems to run real good as far as I can tell so far......58 miles. Anyway, I ride 4000' - 8000'. Please post what elevation you guys are running that are having lean problems please. I do notice a fair amount of heat under my right leg from the pipe at times....is this normal? I know that elevation makes a huge difference in jetting our 2 stroke snowmobiles. I assume it has a similar affect on these 4 strokes too. I should add that the dealer did the free mods except for the baffle.

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I picked up my 05 450 a couple of weeks ago. LOVE IT. Quite a change from my (no laughing) 83 XR 350. I had the dealer remove the stop and the pipe tip. I will be rejetting and removing the AIS but I'm not sure about the grey wire. What is the difference in timing and power? Can I change it back if I don't like it?

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Splice in an on off switch for the gray wire. That way you can choose what ignition timing you want to run. YZ or WR map. :)

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An uncorked and jetted WR and a stocker are 2 different bikes.

A lean bike won't last as long and will run hotter.

I like my JD kit.

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I ride at about 800 ft ASL. The stock jetting was horrible at that elevation. It wouldn't idle, poor throttle response, and a horrible bog at low end.

I followed Indy's base of:

75 to 90 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 68 starter jet, #50 leak jet

And then tweaked it a little. I'm now running:

75 to 90 degrees: 168 main, JD Red #5, 48 Pilot, 1.75 turns, 72 starter jet, #40 leak jet

The idle bog snap is almost completely gone.. I say almost, because its there if you REALLY snap it from idle, but if you were to snap it like that when you actually ride, you'd flip over. :)

Idles great, runs great, couldn't be happier. Well, I'd be happier if I didn't owe anything on it, but other than that. :)

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Indy WR450,

You mentioned stock jetting perfect for 8000'. Would that be the case at that altitude with the free mods done?

thanks, terry

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I would start with stock jetting with all the free mods at 8,000. feet and summer riding. You may need to bump up the main if you feel it is not pulling hard enough up on top. :applause:

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On subject of whether to remove the gray wire.I have an 05 WR450 it is removed or clipped. :applause: From what I have read in dirt rider mag,is that it just changes the timing &computer mapping to the iginition.The grey wire is just a ground that Yamaha uses to switch this from the yzf to the Wr.Yzf is more race mode.

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My local Yamaha mechanic said he was told that pulling the grey wire removed the rev limiter. Does somebody with the wire removed want to test that :-)

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I've been pretty happy with the stock jetting in mine between 8K-12K feet. It is lean for 6K though.

All free mods except "grey wire".

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Mine felt a little boggy at 9000 feet but nothing significant. I still turned in the fuel screw. Definitely, the bike would be too lean at sea level.

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