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48 pilot anyone else?

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So, I was under the impression that my 07 yz250 came stock with 178main, 50pilot, but according to the motosport.com web site, its a 48 pilot. Sure enough when i cracked her open, it had a 48. I thought for the 1st ower put that 48 in there, but now motosport has me thinking???

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Everything I've ever seen references a 50 pilot as stock. In your thread when you got the bike you said it had been 100% built and setup by MDK, I wouldn't for a second think they'd leave stock jetting in there (unless it happened to be perfect for their setup).

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Everything I've ever seen references a 50 pilot as stock. In your thread when you got the bike you said it had been 100% built and setup by MDK, I wouldn't for a second think they'd leave stock jetting in there (unless it happened to be perfect for their setup).

It was a 100% built by MDK(Mike Foster) now called Blonix Speed. When i spoke to him, he told me the owner had been tring different jetting. It's pretty close to stock on the jets. I got on motosport.com web site to order a 50, and they show it with a 48, so it kinda threw me off.

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My 2007 YZ250 had a #50 pilot jet installed from the factory.

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So, I was under the impression that my 07 yz250 came stock with 178main, 50pilot, but according to the motosport.com web site, its a 48 pilot. Sure enough when i cracked her open, it had a 48. I thought for the 1st ower put that 48 in there, but now motosport has me thinking???

Mine came with a 50 PJ, 178 MJ. Bike came from SoCal.

Bought 48 and 45 PJ's, and 175 and 172 MJ's while finding my way with jetting.

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I run a 42 at sea level. Runs great. Starts first kick and Idles Smooth as. Tried going back richer but runs ruff. Float hieght is spot on.:ride:

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Temp around 20-30celcius and I run the STD N3CW Needle. I have tried the CJ needle but This is no good. Im running 1.2mm Squish.

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My bike had not been touched since the previous owner bought it, fully stock on everything.

The other day I took out the carb and was checking my jetting and sure enough I too had a 48 pilot and not a 50 like the manual specified...

Something tells me that the previous owner didn't touch it...

I have an 05

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My bike had not been touched since the previous owner bought it, fully stock on everything.

The other day I took out the carb and was checking my jetting and sure enough I too had a 48 pilot and not a 50 like the manual specified...

Something tells me that the previous owner didn't touch it...

I have an 05

The standard jetting can be different for different countries. For the us it was a 50, but Canada might have been a 48. Some of the other countries still use the older, lower compression head as well.

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