Noise at Kaitoke

**Kendog** · 2nd July 2012, 13:11

I know my bike is loud, because my wife tells me it is.

So for the technically challenged e.g. me, what can I do to make it quieter?
I am happy to remove the pipe and muffler from the bike and take somewhere if that helps.

**F5 Dave** · 2nd July 2012, 14:23

Now I think of it here's a place to recommend a Local muffler expert.

Damon formerly of Cycleworks.
Now works from home.

Its a heck of a drive if yer not from upper hutt, but a courier can do it for you. Or bungy it on the back of the bike & enjoy the ride part way over the Akas.

526 2345

**hmurphy** · 2nd July 2012, 16:02

I'll be honest, I know my bike is already one of the most quiet ones out there

but I do want to be on the safe side.... where is the best place to get CHEAP but decent muffler packing?

**F5 Dave** · 2nd July 2012, 16:22

TM perhaps? TSS stock woven packing. Some people swear by that loose wool stuff but I've never found it any good.

A reversal in flow helps knock out a bit & doesn't have to be restrictive.

**hmurphy** · 2nd July 2012, 16:53

Originally Posted by F5 Dave

TM perhaps? TSS stock woven packing. Some people swear by that loose wool stuff but I've never found it any good.

A reversal in flow helps knock out a bit & doesn't have to be restrictive.

Do you mean run the engine in reverse? My carb would probably be a pretty good muffler, not the highest quality casting. I'll see how much TSS want to take off me for me to grab some packing. I'll repost here how much it costs for reference for other people. I'm not sure but I think I have fibreglass mat in my exhaust which probably sucks ass hahaha. CHEAP BASTARD

**richban** · 2nd July 2012, 17:10

Originally Posted by hmurphy

Do you mean run the engine in reverse? My carb would probably be a pretty good muffler, not the highest quality casting. I'll see how much TSS want to take off me for me to grab some packing. I'll repost here how much it costs for reference for other people. I'm not sure but I think I have fibreglass mat in my exhaust which probably sucks ass hahaha. CHEAP BASTARD

Last lot I got was the pillow packing matt stuff. 25 bucks I think it was. My bike has always been loud. I am determined to get it shut up over the next week. Will post any interesting finds. First attempt is the big volume muffler I have. If its still silly loud then I will try a vented shroud over the end pointing down onto the track. That work wonders for the megaphone.

**Deano** · 2nd July 2012, 17:26

Cheap ? Go to the tip or otherwise find an old oven, remove the rear panel and help yourself to the insulation 'wool'.

**hmurphy** · 2nd July 2012, 17:32

Steve got a new muffler for his bucket a while ago. It's not that long but it's fat as/large capacity (I'm scared of a sentence like that on a biker website). His bike is now pretty bloody quiet, so it looks like decent capacity and decent packing material are the trick. Haha I'll do some dumpster surfing then Deano.

**F5 Dave** · 2nd July 2012, 17:48

But good quality packing will be better & that is the whole point here. I found years back I failed a sound test at Manfield with some brand new old school muffler packing & repacked it with some Daytona woven mat packing a mate had. 20 min later passed the test.

buy some real stuff & solve the problem.

A smaller outlet is probably a good thing. many dirtbike mufflers for big whacking 4 strokes will be needlessly loud (as they are for big dirtbikes we get out on trail rides). But the bigger outlets can make quite a difference increasing the noise. - Needlessly big if fitted to a liddle 150cc bucket.

Having a reverse in the flow can knock some bark out. Damon for example may be able to do an alteration inside the std muffler if you have something rebuildable, or make an add on section.

**speights_bud** · 2nd July 2012, 17:51

Don't steal my idea now, BUT this is what i did for noise testing, it was seriously quiet, sounded like a farm bike/Ag200, was perhaps a little too restrictive but it was just for one day so plumbed up properly it would be a bit better. its pretty easy to do and looks kinda moto3-ish too eh

. With front muffler being a straight through style it was always going to be loud without 'something extra'.

NSR250 MC21 stinger + Zuki 250 pipe:

**Trudes** · 2nd July 2012, 18:00

I love my 2 Stroke.
Like Koba said, quietly sneaking up on people is funny.
Many times I have thought there was something wrong with my bike only to realise that there's a 4 stroke sitting up my bum making horrid noises! Quiet is better, tone that shit down!

**mossy1200** · 2nd July 2012, 20:05

http://www.trademe.co.nz/Browse/List...x?id=488252607

I like this one.

**bucketracer** · 2nd July 2012, 20:19

Originally Posted by speights_bud

would be a bit better. its pretty easy to do and looks kinda moto3-ish too ...

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Only with a bit of dyno time will you really know for sure but you could find the setup worth keeping.

Or the front muffler could be replaced with a resonator chamber and the back muffler made even bigger and more effective.

A resonator at the front would allow the header pipe to be a tuned length that's unaffected by the length of the tail pipe and muffler.

Might be worth a Google and remember you heard about the idea from the 2-Stroke team first .....

**speights_bud** · 2nd July 2012, 22:07

Originally Posted by bucketracer

Only with a bit of dyno time will you really know for sure but you could find the setup worth keeping.

Or the front muffler could be replaced with a resonator chamber and the back muffler made even bigger and more effective.

A resonator at the front would allow the header pipe to be a tuned length that's unaffected by the length of the tail pipe and muffler.

Might be worth a Google.

Yea i will definitely be going back to the setup, it's worth playing around with. There was more noise from the motor mechanics than exhaust. I need to do some serious carb work first though, the 'upgrade' carb came with all sorts of shit internals, diffusers with far to few holes etc. I dunno about Dyno time though that doesn't sound like the good ol spirit of buckets... lol