Thought to be extinct. The elusive... the legendary...

The ubiquitous HRA pipe. New and never installed. In the raw. Very Happy

Now the big question. Color. Chrome would be nice but it tarnishes. Has to be polished to stay looking good. I'm all about minimal maintenance. Maybe just run it as is. Let it rust for that antique effect. Why hide it's natural patina. Nah. Laughing

The auto parts stores sure have a great selection of high temp colors these days. Flat black? Nah. It's been done to death. White? Gold? Red? Urban camoflage? Nah. Something that would really stand out. Flourescents? Safety orange or lime green? How about glow in the dark? Reflective? Hmmm... What to do. What to do. Razz

_________________
Now firing. Inquire within.

Damn, one dose of 'envy in a box'. Ya gotta tell the story .. how this arrives in your hands.

It looks like raw steel so will begin tarnish and rusting, especially if you have touched it. Wipe it clean with carb cleaner or acetone, and coat with WD-40 or penetrating oil. You can always clean it later for painting.

Do take care of it though. I'm pulling mine apart in a few days to view the inside. They are rebuildable but I'm interested in why my scoot is louder than my mc. Both are similar mufflers.

_________________
"I see a big market for designer tin foil head gear..."

"Grow up and stop posting like a 14th Century Vatican Flat Earth Zealot."

Not much of a story. Saw it advertised. Couldn't peel the cash out of my wallet fast enough. Laughing

Firstly I gotta plug up the hole I put in it. Shocked

Should be a cake walk to rebuild one of these. Drill out the rivets and repack the cone and reinstall the end cap. Or you could leave it out and the end cap off for that full blown megaphone effect. They should hear you clear across Taney County. Twisted Evil

_________________
Now firing. Inquire within.

Last edited by AtLarge on Mon Mar 02, 2009 3:47 pm; edited 1 time in total

Can't you still get these new from Hot Rod Al?

I inquired several months ago and he had some, and would even paint it for me (for an extra fee, of course). I ended up getting my HRA pipe used. It works fine, but it definitely sounds like there's a rattle inside. Is that what folks repack? I don't have the first clue about repacking a muffler, or drilling out rivets and re-reveting. How does this all work? What's in there?

I don't understand why there's a hole in the pipe. They don't come that way do they?

_________________
2005 Chetak

	beetle94707 wrote:
	I don't have the first clue about repacking a muffler, or drilling out rivets and re-reveting. How does this all work? What's in there?

The end of the muffler is about 3 1/2", but the exit hole is only about 1". That should be a 1" x 12" pipe with a bunch of holes in it called a baffle. Packed around the baffle should be 2+" of fiberglass to absorb sound. Yours should not rattle. It's possible that you have burned out your packing. I'll pull mine apart and post up some pics later this week.

AtLarge, how in the blazes did you "get" that hole? It don't look like no accident.

_________________
"I see a big market for designer tin foil head gear..."

"Grow up and stop posting like a 14th Century Vatican Flat Earth Zealot."

rufusswan wrote:

	beetle94707 wrote:
	I don't have the first clue about repacking a muffler, or drilling out rivets and re-reveting. How does this all work? What's in there?

The end of the muffler is about 3 1/2", but the exit hole is only about 1". That should be a 1" x 12" pipe with a bunch of holes in it called a baffle. Packed around the baffle should be 2+" of fiberglass to absorb sound. Yours should not rattle. It's possible that you have burned out your packing. I'll pull mine apart and post up some pics later this week.

AtLarge, how in the blazes did you "get" that hole? It don't look like no accident.

Matty had a good write up here about his repack adventure Linky

Yep, no accident. Top secret Stunkworx project. Wink

_________________
Now firing. Inquire within.

That Matty is a smart & adventurous lad. Nice write-up he did, and real smart hitting the muffler guys dumpster. Diving in them things pays off in a society that feels throwing bad stuff in away is somehow beneficial.

The packing does degrade a bit and should be replaced every so often, and evenually a core will burn out. Monza had a great suggest to protect the core with BBQ paint. I'm gonna get 5 days of summer weather so I'll get some pics up of the inside of my HRA.

_________________
"I see a big market for designer tin foil head gear..."

"Grow up and stop posting like a 14th Century Vatican Flat Earth Zealot."

Powder coat it the same color as the scoot (or the secondary color if two tone... I think that would look cool.

I dumpster dive to save the planet.

_________________
The "X" stands for ex-Chetak owner.

a good day in a dumpster is finding a $4000 microscope lens and ebaying it for over $1000

A bad day in a dumpster usually starts around dawn with a hangover Laughing

	dirkhunt wrote:
	Powder coat it the same color as the scoot (or the secondary color if two tone... I think that would look cool.

That would be cool but our local Powder coater doesn't do high temp. I'm taking my que from tmille53. Runs cooler. maintenance free, virtually indestructable. Probably out last the bike.

_________________
Now firing. Inquire within.

Thanks for the lesson and the link...I'm getting a picture of it for sure and beginning to understanding the concept, but I'll really grok it once I see my own opened up.

How would a burned out core affect performance or sound (other than the rattle)?

If I get into this project, it will be down the road a little...I have no time these days. Maybe this will be a good spring break project...

_________________
2005 Chetak

	beetle94707 wrote:
	How would a burned out core affect performance or sound (other than the rattle)?

Well, if the core is rotted out then you would have less restriction. Less restriction will make it exhaust easier and louder but you probably gain a few rpms. The downside is it might be effecting your burn and could lean it out which isn't good either. Most will say a motor needs at least some amount of back pressure. On the other hand have you ever seen a dragster with a muffler? On the other other hand (hopefully you have two) those motors don't have a operating range like a motor vehicle driven on the street. It's usually either idling roughly (loping) or wide open going down the strip. All the tuning is done in the pits. Modern cars nowadays have oxygen sensors in the exhaust to measure air/fuel mix and tune by wire. The computer receives this signal and adjusts accordingly. A little Lunger like ours can only adjust timing (TRICS) not fuel delivery. So, when you start making changes to intake/exhaust your kind of flying blind. You need a way to measure what effects your changes made.

_________________
Now firing. Inquire within.

Beetle,

If the 'core' is made with the thiner wire stuff Matty showed in the linky provided then it could rattle if it the core has burned out (our the packing deteriorated). Some jackass could also have rolled a marble down the core just to farkle with you too Laughing

If the core collapses the worst is that there is a bit more restriction than normal, or in the end less restriction as AtLarge said, if the collapse leads to blowing out the packing entirely.

_________________
"I see a big market for designer tin foil head gear..."

"Grow up and stop posting like a 14th Century Vatican Flat Earth Zealot."

cool...thanks AtLarge and Rufusswan. Before long I'll understand all the inner and outer workings of engines and exhaust and all that good stuff.

_________________
2005 Chetak

yes ...it's true... I think I would give up my "left one" for an HRA pipe... I weep...

The only question is... do you want it in a mason jar or fried? Laughing

_________________
Happy Trails,

Cowboydoug

I moved to Utah for fly fishing and the big haired girls...
-the fly fishing has been very good to me...

Bad news for you Dougieboy. The market is for right testicles. Laughing

_________________
Now firing. Inquire within.

That's how I got my LiL' Mule in the 1st place... Shocked

_________________
Happy Trails,

Cowboydoug

I moved to Utah for fly fishing and the big haired girls...
-the fly fishing has been very good to me...

At the risk of Cowboydoug's gonads Laughing

here's my pipe back from Jet-Hot.

OMG. It's gorgeous. Cool

_________________
Now firing. Inquire within.

	AtLarge wrote:
	OMG. It's gorgeous.

You couldn't have picked a better colour. Very Happy

Doug's gonads won't stand a chance .. hell, his whole apparatus wouldn't stand a chance. Wink

_________________
"I see a big market for designer tin foil head gear..."

"Grow up and stop posting like a 14th Century Vatican Flat Earth Zealot."

	AtLarge wrote:
	At the risk of Cowboydoug's gonads here's my pipe back from Jet-Hot. OMG. It's gorgeous.

Cruel Bastards each & every one of you... but yeah... sweet Wink

_________________
Happy Trails,

Cowboydoug

I moved to Utah for fly fishing and the big haired girls...
-the fly fishing has been very good to me...

That's gonna look really sweet .. wait, it's going to look just like mine, which is friggin great! Good work! Sorry Doug. Very Happy

_________________
Wheelsdown

2006 Bajaj

50 miles a day, everyday

Got a few more rpm's and a little more volume. Twisted Evil

_________________
Now firing. Inquire within.

That looks incredible. Can you tell us if it is as loud as the POC Phil pipe? I rode behind my POC Phil-equipped club mate's Chetak at the Windsor rally last year and my ears are still ringing. The weird thing is that I LIKE it!

_________________
Ronin
Rovers SC
1981 Vespa P200e
2002 Bajaj Legend
2005 Kymco Agility 125
http://www.examiner.com/x-3223-Detroit-Scooter-Examiner

	Ronin wrote:
	That looks incredible. Can you tell us if it is as loud as the POC Phil pipe? I rode behind my POC Phil-equipped club mate's Chetak at the Windsor rally last year and my ears are still ringing. The weird thing is that I LIKE it!

Welp. No, I can't. I don't even know what another Chetak sounds like let alone one with a POC Pipe installed. They are kinda rare in these parts. It doesn't sound excessive to me. More like something in the 250 to 350 range now. I'm still trying to get used to it especially with it being so quiet before. I did have a fit issue that I was a little disappointed with. The mounting holes wouldn't allow a good seat in the exhaust port. Waaayyy too much leakage. Now that was loud. So, I let the port be the lead and redrilled the hole in the plate. Minor problem, but a little extra hassle none the less plus it puts the pipe another 1/2'' or so closer to the street. Rolling Eyes

Anyway, once I got that straightened out I really got to have some fun. I added a couple gauges to the dashboard. I'm still dialing it in but it's getting there. Wink

_________________
Now firing. Inquire within.