Loud pipe for the GZ

[Easy Rider]

Originally Posted by rayzuki

has anyone else drilled holes? It sounds like an easy way to get a little volume but, I don't want to do anything yet without a little more feedback on this.

Yes, but 1/2 inch holes will make a BIG difference.

I put 1/4 inch holes in mine; 4 of them, inside the raised ridge near the center hole.
I think that putting them outside the ring would be more of a change.
I'd be afraid that 1/2 inch holes would affect the flow too much and result in reduced performance (without jetting changes) but maybe not.

Anyway, with 1/4 holes, you could easily tap them and put in 1/4 inch bolts to get it back to stock.

[CANDY]

here are the pictures of my new pipe. this is louder than the drilled stock pipe.

[jonathan180iq]

How did you mount the pipe to the hanger?

[CANDY]

the pipe comes with a set of three interlocking adapters that fit fit the existing pipe. and it comes with a bracket that mounts to the frame. the bracket is about 1 - 1 1/2 inches too long. a friend cut a piece of 1/8 " stainless 3" long and drilled holes in each end to match the frame and sliding bolt on the pipe. my husband had to cut the old pipe just to the left of the weld,because of a bolt or something on the old pipe behind the cover. i will try to get closer pictures and post tommorrow. i got the pipe from j.c. whitney - it is a 18" seamless shorty megaphone with removable baffles. cost was around $53.00.

[jonathan180iq]

Thanks for the info. There is also a longer version of the same pipe, for anyone who wants a slightly deeper tone.

[trykemike]

What carb mods are required if any for a drilled pipe ?

what sound increase can be noticed ?

1 - candy did you have the jetting changed for the drilled pipe ?

2 - easy - rider did you have to change the jetting for the drilled pipe ? was the sound better ?

3 - David I can't see the pipe clearly are the holes inside the centre near the main hole ? what jetting was required ?

4 - any one else with some info ?

[Easy Rider]

Originally Posted by trykemike

2 - easy - rider did you have to change the jetting for the drilled pipe ? was the sound better ?

No and no.

What we have to work with is, after all, an engine that is about the same as a large lawn mower.....honestly.
It is never going to sound like a "big" motorcycle, no matter what you do to it.

With my 4 little holes, the sound difference is noticeable only to the operator; a few feet away and it's pretty much the same.

IMHO, if you really think you need to make more noise, get different pipes.

And if you really, REALLY think you need to make more noise.........get a different bike.

[jonathan180iq]

And whatever you do, do not punch the baffles. I did it way back when and it sounded horrible. I spent $400 and replaced the whole system it was so bad.

[TCruz]

Candy, what did you have to do to the carb with that new pipe? My wife just got a GZ250 and whoever had it didn't just drill holes in the end plate, they ripped the whole dang thing out. Bike sounds like a dirt bike. Needs to be changed. I will do what Candy did but where do I find the shims and jets if needed for the carb?

[jonathan180iq]

Read Jaime's write-up on the "GZ power increase"

http://www.gz250bike.com/viewtopic.php?t=617