465 muffler info needed

[GMC]

Hi Guys, due to recent feedback it seems my 465 muffler jig is NQR.
I have what I beleive is a good jig for the 83 490 muffler, so does anyone know if this muffler is interchangable with the 465's
From what I can gather, the muffler that I jigged from for the 465 was not an original & must not have been fitting properly so I jigged a perfect replica of an ill fitting muffler 

If the 465 muffler is different to the 490 muffler then does anyone have a good fitting 465 muffler that I could borrow? Would only need it for a day or 2.

[Viper666]

They are different part numbers for both 82, & 83 but the 80 & 81 465 are the same.
I am about to restore a 465H for a mate for next season and maybe he will lend it but if I know him he will want something in return?
I will ask him.
Viper666

[GMC]

Thanks Viper, yes your right about the part No's, but it may be something as simple as the later muffler being 10mm longer that would bring out a new part No, so it doesn't completely rule out interchanging mufflers.

Depends how many arms & legs your mate wants.

[Viper666]

He wants to keep the original pipe and mufler for when he retires the bike. He has a DG pipe already but doesnt have a mufler. What sort of deal could you do?
Viper666

[YZ250H]

Did you need the muffler or just some dimensions Geoff.  Not sure about the one I took off my bike, but it seemed to fit the bike OK.   You are welcome to have it if it is any good to you.  I will take some photos on the week-end if I get a chance.  I put a DG muffler on it in its place, but it does not overlap the standard pipe and needed a joint.  Are you after any particular measurements ?

If it helps the 250 and 465 frames are the same.

[holeshot buddy]

pretty sure 490j and 465h
dg pipe and mufflers the same dimensions
muffler mount may vary

[yz490rules]

The J muffler is longer than than the 465.  The J muffler has a resonater chamber on the muffler so the pipe is slightly shorter and the muffler tail longer.



Stephen

[GMC]

Thanks for the input guys.
Dimensions aren't really helpful as angles & stuff is hard to define.
Ideally I need to borrow a good original. (Stuffed core doesn't matter)
The one I originall jigged from didn't have the front mounting bracket which leads me now to suspect it wasn't an origianl 465 muffler.
I need to set up properly the entry angle of the stinger tube & it's relationship to the mounting brackets

[torm92]

I have a NOS 490 J muffler in wrapping if thats any good .

[GMC]

I have a NOS 490 J muffler in wrapping if thats any good .

Hi Torm
Whereabouts are you?
It would be intersting to compare to my 83 K jig as the J & K models have differnt part No's for the muffler.

[torm92]

Hi GMC , im in Doncaster but work in Campbellfield . Been wanting to get up your way to give you some work I need doing . Will I bring the muffler too?

[E74]

I have an original 465H one here, PM me your address and I will send it down, just send it back when you are finnished

[YZ250H]

There you go - once again very generous Darren.
I would have sent mine GMC, but I couldn't put my hand on my heart and say it was the right one.

[GMC]

Thanks Torm. Theres no urgency for the J - K comparison but it would be good to add to my knowledge base, so whenever you wander up this way would be fine.

[frostype400]

do you do a pe400 one gmc i can lend a good one of those