let's get to the bottom of this "holes in the muffler&q - Page 2

**jonathan180iq** · 07-10-2008, 08:18 AM

After riding to work this morning I can say that it's not really all that bad.

You can only hear it when the RPMs are below 3k.
Also, the video sounds a little hollow. It's a bit deeper than that.

It's not really a plus or a minus. It's just slightly deeper and you can hear that there is a muffler on the bike. That's all.

I'm going to leave it like this and see how I feel about it in a few weeks.

Also, I get my UNI replacement filter this afternoon. Once I rejet, we'll see how the sound changes.

I think the previous version that I heard of a drilled exhaust has something else done to it because it was hideous.
Different from what I have done here.

cconleyjr · 07-15-2008, 07:38 PM

I drilled 6 small holes in my baffle wasn't really a significant change but I like it because I can hear the bike run over the wind at high speeds now

patrick_777 · 07-15-2008, 08:15 PM

I just tapped the holes in mine and capped them with bolts. Then I sprayed over them with high-temp grill paint. The sound is much more subdued and I'm hoping to maybe up the mpg a little bit.

We'll see.

rayzuki · 07-15-2008, 08:30 PM

I have decided not to do this. I really wanted to. I would like some more noise. Not stupid like a harley but just a little more to get me noticed but I think I will just leave things alone on this.

Sarris · 07-15-2008, 08:48 PM

I have decided not to do this mod. First, I have a couple HD's that make a shit load of noise, so the quiet GZ is a nice change. Second, I'd have to rejet and mod the carb to get it to run right. This mod also usually causes the pipes to blue, and mine has over 12k with no blueing. Third, I don't want to screw up my gas mileage as I'm getting 72 mpg consistantly.

I figure I'm patient enough to live with it the way it is. The dealer adjusted my GZ carb (popped the carb caps) at the 600 mile service, so mine doesn't run lean. No flat spots, no popping, and it accelerates strong and smooth.

Anyway, you gotta know that even if you get a 10% increase in horsepower, you'll maybe have 20 hp max all said and done. It just isn't worth the negatives and the hassle to gain 2 hp maybe. I think if you bought a GZ to fast, you've really have bought the wrong bike. It is what it is.

:2tup:

cconleyjr · 07-16-2008, 07:06 AM

I travel alot at 55 plus and had a hard time hearing the engine over the wind. I wasn't looking for a hp increase or anything like that. My gas mileage hasn't changed i still get 67 to 70 mpg.

**jonathan180iq** · 07-16-2008, 08:57 AM

Quote:

Originally Posted by cconleyjr

I travel alot at 55 plus and had a hard time hearing the engine over the wind. I wasn't looking for a hp increase or anything like that. My gas mileage hasn't changed i still get 67 to 70 mpg.

The change in gas mileage comes if you also shim your needle. This shim allows more fuel to flow and, consequently, to burn, which lowers fuel economy.

**jonathan180iq** · 07-22-2008, 03:45 PM

I could only stand the holes for all of 2-3 weeks. They have been capped. Don't do it. It's only cool for about 45 minutes.

D Futch · 07-22-2008, 09:13 PM

To each his own as the pic on page one shows I have 4 holes in mine and I like it just fine. When I got the bike the guy I baught it from had cut off the muffler at the small heat shield by the foot peg, So I welded it back on and ran it with the stock muffler for a day or two and then I put the holes in and I like it just fine. have had it that way for the last 1000 miles or so. :roll: But as I said to each his own!!!!

rexolio · 07-27-2008, 07:50 PM

I'm a total newbie - I know NOTHING - but wanted to share my experience. Take it for what it's worth and give much more weight to the more experienced guys in this thread...

I bought mine with no mods to the muffler. A couple of weeks ago my uncle, an old motorcycle rider from way back who still rides told me I ought to drill some holes (he had just done this to a new bike he bought.) So, I let him (what do I know, anyway.)

He drilled 4 holes, about the same size as D Futch. He drilled through 2 baffles on all 4 holes, then he drilled through at least one in the original hole.

I have to say, I really like the sound (doesn't sound like a lawn mower to me.) It has a nice deep sound, and I like the "thumps" when it's idling.

I will also say that I was surprised when a few hills I drive on my way to work were less of a challenge. Before, my bike would quickly start to strain on them and bog down toward the top. After the holes, although I'm sure it doesn't take the hills like a bigger bike, it rides over them with much more power than before.

I also was pleased to find that my gas mileage seems to have increased from 62 mpg (in the 4 weeks prior) to 67 mpg (during the last 2 weeks.)

07-10-2008, 08:18 AM	#11
jonathan180iq Super Moderator Join Date: Jan 2007 Location: Dalton, GA Posts: 3,996	After riding to work this morning I can say that it's not really all that bad. You can only hear it when the RPMs are below 3k. Also, the video sounds a little hollow. It's a bit deeper than that. It's not really a plus or a minus. It's just slightly deeper and you can hear that there is a muffler on the bike. That's all. I'm going to leave it like this and see how I feel about it in a few weeks. Also, I get my UNI replacement filter this afternoon. Once I rejet, we'll see how the sound changes. I think the previous version that I heard of a drilled exhaust has something else done to it because it was hideous. Different from what I have done here. Login or Register to Remove Ads
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07-15-2008, 07:38 PM	#12
cconleyjr Member Join Date: Jul 2008 Location: Boyd County Kentucky Posts: 75	I drilled 6 small holes in my baffle wasn't really a significant change but I like it because I can hear the bike run over the wind at high speeds now __________________ If it's too loud turn off your hearing aid
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07-15-2008, 08:15 PM	#13
patrick_777 Senior Member Join Date: May 2008 Location: Tulsa, OK Posts: 1,763	I just tapped the holes in mine and capped them with bolts. Then I sprayed over them with high-temp grill paint. The sound is much more subdued and I'm hoping to maybe up the mpg a little bit. We'll see. __________________ ]I am hiding in Honduras. I am a desperate man. Send lawyers, guns and money. The shit has hit the fan. Login or Register to Remove Ads
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07-15-2008, 08:30 PM	#14
rayzuki Senior Member Join Date: Nov 2007 Location: portland, or Posts: 154	I have decided not to do this. I really wanted to. I would like some more noise. Not stupid like a harley but just a little more to get me noticed but I think I will just leave things alone on this. __________________ Yeah, I'm about as useful as a condom dispenser in the vatican. -- Jonathan
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07-15-2008, 08:48 PM	#15
Sarris Senior Member Join Date: May 2007 Location: New Port Richey, Florida USA Posts: 1,348	Muffler Holes I have decided not to do this mod. First, I have a couple HD's that make a shit load of noise, so the quiet GZ is a nice change. Second, I'd have to rejet and mod the carb to get it to run right. This mod also usually causes the pipes to blue, and mine has over 12k with no blueing. Third, I don't want to screw up my gas mileage as I'm getting 72 mpg consistantly. I figure I'm patient enough to live with it the way it is. The dealer adjusted my GZ carb (popped the carb caps) at the 600 mile service, so mine doesn't run lean. No flat spots, no popping, and it accelerates strong and smooth. Anyway, you gotta know that even if you get a 10% increase in horsepower, you'll maybe have 20 hp max all said and done. It just isn't worth the negatives and the hassle to gain 2 hp maybe. I think if you bought a GZ to fast, you've really have bought the wrong bike. It is what it is. :2tup: __________________ Prudent riders live longer than moron riders. Login or Register to Remove Ads
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07-16-2008, 07:06 AM	#16
cconleyjr Member Join Date: Jul 2008 Location: Boyd County Kentucky Posts: 75	I travel alot at 55 plus and had a hard time hearing the engine over the wind. I wasn't looking for a hp increase or anything like that. My gas mileage hasn't changed i still get 67 to 70 mpg. __________________ If it's too loud turn off your hearing aid
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07-22-2008, 03:45 PM	#18
jonathan180iq Super Moderator Join Date: Jan 2007 Location: Dalton, GA Posts: 3,996	I could only stand the holes for all of 2-3 weeks. They have been capped. Don't do it. It's only cool for about 45 minutes.
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07-22-2008, 09:13 PM	#19
D Futch Junior Member Join Date: Apr 2008 Location: Deland Fl Posts: 15	To each his own as the pic on page one shows I have 4 holes in mine and I like it just fine. When I got the bike the guy I baught it from had cut off the muffler at the small heat shield by the foot peg, So I welded it back on and ran it with the stock muffler for a day or two and then I put the holes in and I like it just fine. have had it that way for the last 1000 miles or so. :roll: But as I said to each his own!!!!
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07-27-2008, 07:50 PM	#20
rexolio Member Join Date: Jul 2008 Location: Woodstock, GA Posts: 58	I'm a total newbie - I know NOTHING - but wanted to share my experience. Take it for what it's worth and give much more weight to the more experienced guys in this thread... I bought mine with no mods to the muffler. A couple of weeks ago my uncle, an old motorcycle rider from way back who still rides told me I ought to drill some holes (he had just done this to a new bike he bought.) So, I let him (what do I know, anyway.) He drilled 4 holes, about the same size as D Futch. He drilled through 2 baffles on all 4 holes, then he drilled through at least one in the original hole. I have to say, I really like the sound (doesn't sound like a lawn mower to me.) It has a nice deep sound, and I like the "thumps" when it's idling. I will also say that I was surprised when a few hills I drive on my way to work were less of a challenge. Before, my bike would quickly start to strain on them and bog down toward the top. After the holes, although I'm sure it doesn't take the hills like a bigger bike, it rides over them with much more power than before. I also was pleased to find that my gas mileage seems to have increased from 62 mpg (in the 4 weeks prior) to 67 mpg (during the last 2 weeks.) __________________ rexolio Rex White Woodstock, GA Owner of 2006 GZ250 since June 2008 - Yup, I'm a newbie!
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