I am looking for a more modern exhaust pipe and silencer to reduce how loud the bike is. Do i need to bend a different models pipe. I know this effects the power but im riding it to work and the neighborhood wants to pull me by my neck behind their prius's. I am a super novice and so any help is good help. Also any other tips for noise . I herd about rubber between the fins but i cant find a resource to buy them. Thanks
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Hi everyone,
As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.
When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.
Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.
Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.
Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.
Thanks for your patience and support!
78 390 Auto Exhaust Question
- Thread starter nick2412
- Start date
390wr Jon
Husqvarna
AA Class
Comet Kart Sales have rubber fin inserts. Here is the link: https://cometkartsales.com/Yamaha-Head-and-Cylinder-Parts/
I used them on my 1980 390 WR and they fit fine (I bought my 390 WR new and they came with them from the factory). The Comet Kart rubber insert width and fin spacing was the same as my original rubbers.
The only thing is the Comet Kart rubber inserts are not as deep as the originals (in other words, they don't go it the cyclinder fins as deep as the originals). They would probably not come out, but to be safe I put a couple of dots of 3M black 5200 to make sure they didn't go anywhere.
I do believe the rubber inserts cut down on cyclinder noise/ ring.
Also , I had a 1974 400WR back in the day and if my memory serves me right it did not have the rubber inserts. However, I cut legths of black rubber fuel line and inserted it between the fins. It worked well, but did not look as nice a the rubber inserts.
Hope this helps.
I used them on my 1980 390 WR and they fit fine (I bought my 390 WR new and they came with them from the factory). The Comet Kart rubber insert width and fin spacing was the same as my original rubbers.
The only thing is the Comet Kart rubber inserts are not as deep as the originals (in other words, they don't go it the cyclinder fins as deep as the originals). They would probably not come out, but to be safe I put a couple of dots of 3M black 5200 to make sure they didn't go anywhere.
I do believe the rubber inserts cut down on cyclinder noise/ ring.
Also , I had a 1974 400WR back in the day and if my memory serves me right it did not have the rubber inserts. However, I cut legths of black rubber fuel line and inserted it between the fins. It worked well, but did not look as nice a the rubber inserts.
Hope this helps.
Crashaholic
Husqvarna
Pro Class
I'm not very knowledgeable with Huskys later than 75 so I can't help with your exhaust questions but something else comes to mind. How many miles (hours) has it been since its last re-bore? Piston slap can be very noisy.
grouty
Auto Lover ...
The factory pipe on the 390 Auto was noisy. A 1978 6 speed 390 WR pipe will quieten it down a fair bit. Failing that, you could cut the silencer off from a WR pipe and fit an alloy one from HVA Factory for a later 79/80 390. If you don't mind a bit of fabrication and welding you could use the complete system from a 79 390WR. The WR's had a more effective silencer and a twin walled front pipe.
I have the 390CR one piece system on my auto, and yes, it's still a bit loud.
I have the 390CR one piece system on my auto, and yes, it's still a bit loud.
DeathFromAbove
My Cat Says AREAR!
I like them loud, the pecker in the prius can't hear you unless it's loud. They are made to be quiet to the occupant. Drop a 6 pack on the neighbors porches and call it good. You gotta make a living, and using a 41 year old Husqvarna Auto as transpo is way cool, the men on the street wished they could be so trust worthy to a machine (they sold their dreams a long time ago) There lives are over! Their women wish you weren't so reckless (they married a man with dreams and a motorcycle). I say let it hang out!! You only get one chance to ride this life, I hope you never say never!! Just not to the fuzz!