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General Category >> Rubber Side Down! >> Stock header pipe.
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Message started by mikestrikes on 09/25/08 at 14:49:20

Title: Stock header pipe.
Post by mikestrikes on 09/25/08 at 14:49:20

I know most stock pipes are double walled.

I want to know the inside dia of the stock pipe so I can go ahead and pick up some SS tube a little bigger to make a new one.

Title: Re: Stock header pipe.
Post by KwakNut on 09/25/08 at 15:42:02

Stock pipe ID is about 1¼", but that's way too small. Some aftermarket pipes are up to 50mm ID, but that's a little too big unless you're wanting to go for a really wild tune and overbore.

Keeping to 650cc and not wanting to rev much higher, but porting, sorting cam and carb, a 1¾" header would be about ideal. Anything from 40-45mm would be ok.

Title: Re: Stock header pipe.
Post by mikestrikes on 09/25/08 at 17:44:48

Well I got an old SS Muzzys header from a Kawasaki thats 1.425" inner dia, that for about half way then step up to 2" should work then..

Looks like I wont need to mess with the intake hardly at all, but that exhaust has alot of work needed.. that and bump the comp up a point or so ....

Thanks this helps alot..

Title: Re: Stock header pipe.
Post by LANCER on 09/25/08 at 19:18:16

I used 1.75" OD pipe, with 1.6" ID. This was with a performance cam and performance carb kit + a great muffler.

With those basic mod's this pipe works great. I had intended to try a 1.5" ID with transition to 1.6" ID and then 1.75" ID before the muffler, but have yet to get it down.