Noise opinion

Roy Gavin

Well travelled
If you look at the factory torque on the nuts on the exhaust flange they should not be tight, probably need a lock nut to retain them.
On Auto's the trick is to heat the exhaust pipe cherry red with oxy till they bend and sit relaxed and easy, if you are going to wrap them you might get away wiith it on a bike.
FWIW they do it that way at the Merc factory!
 

Laserman

Well travelled
Staff member
My 2 cents about exhaust wrap: don't do it on a daily driver. It's really for extracting maximum combustion efficiency by promoting scavenging, it's function is to make sure the header gets hot as hell very quick and stays hot. This is great on an engine where it matters - like a drag strip. On a daily driver, you are creating a larger heatsink subject to all kinds of humidity changes over time and eventual persistent condensation. On a steel exhaust this will cause it to get flake rust on the inside and pit. On a stainless steel exhaust this can cause the whole pipe to degrade and get brittle in the wrapped areas, leading to a possible crack. Stainless replenishes it's surface via oxidation: it needs the atmosphere to keep itself intact. Stainless steel is lousy underwater for this reason. A proper stainless exhaust should out-last the engine unless you live in super-high humidity.

Some people wrap exhaust for looks too, which in my opinion is yet another example of someone doing something stupid to their vehicle just to impress others. Kinda like donk wheels or overcambered suspension - form over actual function. I work for a hotrod shop, we see a lot of that and get to undo it much of the time after a good talk with the customer lol. Some mods are just about mandatory, some are beneficial-but-optional, and the rest seek validation from others. Wrap your exhaust if you want, but you might as well use snakeskin.

Rattles can come from the damnest things and as a long-time old/rattle-prone vehicle owner, I find it fun to hunt them down and silence them. Every vehicle has a "harmonic hotspot" somewhere in it's engine RPM range and/or speed range, where anything that can rattle probably will. The nuts and bolts on a motorcycle need to be checked far more often than an automobile does. The Himmie's headlight and windshield are rattle-prone areas, as is anywhere where plastic is undamped. I found a rattle in my left-side panel once, I used some sticky rubber pads to fix it. Sometimes a rubber mount can exacerbate the vibration, some things need to be solid-mounted.
 

Laserman

Well travelled
Staff member
It's not for looks, it's to quieten down the piece of rubbish I bought.
Hey, if you don't like how refined your relatively inexpensive, single-cylinder motorcycle built in India and sold for under $3K there sounds, that's too bad. To each their own I spose. I love the noises my "Toto" makes, and the "Yeti Yell" she has under WOT makes me smile every time I have to merge onto a California freeway. I hunted down all the rogue rattles mine has had, and the only thing I hear is the wind, exhaust and my Guardian Bell dinging softly.

Heatsink, really ,it's out in the elements buddy.
Is the inside of the pipe out in the elements? How many thousandths of a millimeter do you think are directly affected by the elements in a typical 16ga wall exhaust tube? I don't know and you're prolly not a master of thermodynamics or metallurgy either, so we're both SOL. Well, I do know that insulated metal that was previously heated from within is going to radiate that heat towards anything cooler than it. A wrapped pipe gets much hotter within than an unwrapped pipe, doesn't take a genius to understand that. I've just been a humble metalworker for 27 years or so.
 

tom_d

Well travelled
Location
US
It's not for looks, it's to quieten down the piece of rubbish I bought. Heatsink, really ,it's out in the elements buddy.
Not really rubbish is it? I see you've posted about worn out rear bushings at 275 km (seems you meant the cush drive), that you have grinding sound when your bike is on the side stand and perhaps it a cam bearing, that you put on exhaust wrap to quiet down the engine noise and is mostly successful, that the bike is a pile of rubbish at this 275 km mark, and you will never ever ever take it to a dealer for repair. I suspect if this is the road chosen, it will be quite a bumpy ride for you.

For some reason, yours definitely doesn't appear to be a normal experience and the diagnosis and fixes don't quite track for me. For example, grinding noises while on side stand, could possibly cam bearing related, and exhaust wrap quickly selected as a solutions to engine noise in general? Perhaps they would make more sense if you could provide more context and information about how you found your insights? On a lighter note, perhaps this is just conversational play brought on by COVID boredom? I can't blame anyone for the latter, we are social creatures though I am quite bad at it. :)
 

Roy Gavin

Well travelled
Problem for Typhoon is the dealer, and probably the predelivery that they were supposed to have done.
And if you have dealt with this dealer you would never want to go near them again, ever.
Other Adelaide riders report the same, my experience with them was years ago with a Yamaha , under warranty but they wouldn't ever hold a conversation, just told you it was not a warranty claim and walked away.
And the cush drive is the complete assembly, the rubber bushing is the bit that wears, and takes the hub bearing with it. They probably lost the axle spacer when the bike was assembled in the dealers , Oz dealers get them in a crate--!
 

Typhoon

Well travelled
Well they're$8500 here. It's just a lemon. My mates is a killer bike, mines not! Nothing else of value to add since I ruffled a few septic feathers, hurt ya feelings or whatever. Cheers
 

tom_d

Well travelled
Location
US
Well they're$8500 here. It's just a lemon. My mates is a killer bike, mines not! Nothing else of value to add since I ruffled a few septic feathers, hurt ya feelings or whatever. Cheers
They do offer a lot for not too much coin, hopefully the path to lemonade appears quickly. Thanks to Roy for adding the context about the customer service. At least that could provide a possible explanation about the cush drive rubbers.
Technical discussions in a forum of people from around the world can be a challenge, I just try to stick to the information and do my best to understand. Ascribing what someone might have meant works poorlyl for me, though if I'm in a saloon (don't laugh, we still have those) and beers are flying I usually know to duck then ask questions. No hurt feelings here and for what its worth, hope there are none elsewhere. I hope you find a better dance partner for a dealer/RE rep.
 

Typhoon

Well travelled
We'll it happened today, she go bang . Gudgeon pin thru the barrel at 300 km from new. Ordered a barrel n piston kit from India and gotta move it on when I rebuild it. Didn't even make it to it's first service. Going to a Honda dealer tomorrow .
 

tom_d

Well travelled
Location
US
We'll it happened today, she go bang . Gudgeon pin thru the barrel at 300 km from new. Ordered a barrel n piston kit from India and gotta move it on when I rebuild it. Didn't even make it to it's first service. Going to a Honda dealer tomorrow .
Wow, you didn’t even get 50 km on it since noticing a cush drive issue. I’m going with the piston and rings having severe damage and scoring as well? Obviously, you know it’s covered if not caused from abuse.
 

Typhoon

Well travelled
Back running, 6 days delivered from India, 2 1/2 hours build time. Installed different circlips on gudgeon pin. Extra $5 at cbc bearings. Standards are soft as, no wonder one "fell out" and damaged the bore. Cost you ask? $357 all up, easier than dealing with the dealer. Was a good chance to measure up for future bigger valves and cyl head mods. Should be able to clone jawa 2 valve speedway bike cyl head design for more ponies. See how we go
 

Typhoon

Well travelled
Just got a sms from TEC saying hot cams are available again. Might try and see if they do an unground cam so I can get it ground to my own specs. Had a bit of a change of heart with the Himalayan. Gunna work the nuts out of the engine. Himilayan horsepower shootouts sounds like a giggle. Bit like the old bucket racing glory days. Set some guidelines if interest warrants it , ie 98 Ron fuel max, 411cc and unlimited capacity, Dyno sheets to prove REAR Wheel horsepower etc. Any takers? I reckon we should see 50+ rwhp . Bring the himis into the 2020s kicking n screaming !
 

MikeM

Well travelled
Location
So Cal USA
Just got a sms from TEC saying hot cams are available again. Might try and see if they do an unground cam so I can get it ground to my own specs.
I tried to order a TEC cam the same day I got the message and they were out of stock already. I think they have really under estimated the demand.
 

Metalsnacks

Well travelled
Location
Sydney Australia
Had a bit of a change of heart with the Himalayan.
This sounds like the start of a beautiful love-hate relationship :)
Anyway I’m happy you’re going to stick with the bike and very interested to see what you come up with to wring some decent power out of that lazy engine.

What’s going on with your Simpson crossing, still on the cards?
 
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