Will an 06 YZ250F pipe fit an 06 YZ450F?

Will my 06 450F's Pro circuit T4 slip-on swap out with a stock 06 250F pipe? I think part numbers are different for the PC pipes but from what I remember subframes and mounts are the same?? What's the difference?:worthy:

Will my 06 450F's Pro circuit T4 slip-on swap out with a stock 06 250F pipe? I think part numbers are different for the PC pipes but from what I remember subframes and mounts are the same?? What's the difference?:worthy:

Different diameters. 250 is smaller.

Different diameters. 250 is smaller.

Thanks!:worthy:

I called the dealership and they didn't even know. You would think they could have just looked at the showroom 07's they had and compared them... oh well.

Actually it will fit, I think the headers were the same size on the YZ250F and the YZ450F in 2006. Many aftermarket companies use the same slip on for the 450 and 250F for 06. I don't know how it would perform since it isn't tuned for that bike, but it probably wouldn't work too badly.

Actually it will fit, I think the headers were the same size on the YZ250F and the YZ450F in 2006. Many aftermarket companies use the same slip on for the 450 and 250F for 06. I don't know how it would perform since it isn't tuned for that bike, but it probably wouldn't work too badly.

250 is a smaller diameter headpipe. I looked at both today..and measured.

Were both of them 06's? I have swapped silencers from an 06 YZ450 to an 06 YZ250F before. I know that FMF and some other companies have the same part number for pipes for these two bikes.

Im 100 Percent positive that the 250 is the smaller diameter, since a exhaust company had sent me a 450 header on mistake! It did not fit

The headers are a different diameter where they meet the head, but the headers are the same diameter where they meet the midpipe. He was asking about a slip on, so the diameter at the midpipe is what matters.

Were both of them 06's? I have swapped silencers from an 06 YZ450 to an 06 YZ250F before. I know that FMF and some other companies have the same part number for pipes for these two bikes.

I'm talking headpipe....where it bolts to the head. If the stock gasket where the two pipes join are the same part # between the 250 and 450, then it will fit.

The headers are a different diameter where they meet the head, but the headers are the same diameter where they meet the midpipe. He was asking about a slip on, so the diameter at the midpipe is what matters.

Yes, I was asking about a slip-on. I plan to just go by the bike shop after work and check them out myself to make sure. I agree the headers are most likely different diameters where they connect to the head.

oops my bad about the header srry

The 450 is very slightly larger at the mid junction. I had a White Bros. E series from my 06 250F, and it was just a skosh too small for the 07 450. Took it to the local custom exhaust shop, and in 30 seconds on the tube stretcher it was a perfect fit. The guy wouldn't even let me pay him.

Don't know if it is as easy to make it smaller, but for a $350 savings I would take both pieces to your local exhaust fabricator and find out what they can do. Those tubes are like putty to the guys with the right tools and skills.

The 450 is very slightly larger at the mid junction. I had a White Bros. E series from my 06 250F, and it was just a skosh too small for the 07 450. Took it to the local custom exhaust shop, and in 30 seconds on the tube stretcher it was a perfect fit. The guy wouldn't even let me pay him.

Don't know if it is as easy to make it smaller, but for a $350 savings I would take both pieces to your local exhaust fabricator and find out what they can do. Those tubes are like putty to the guys with the right tools and skills.

Yamaha increased the size of the pipe on the 450 at the midpipe junction for 07. In 06 both bikes had the same sized midpipe.

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