Author Topic: 4 into 4 341 exhaust from David Silver Spares. Discontinued?  (Read 4917 times)

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Offline VTCBike750

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Re: 4 into 4 341 exhaust from David Silver Spares. Discontinued?
« Reply #25 on: December 07, 2019, 04:19:34 PM »
Yamiya No numbers are cheap compared to NOS 341. Do not mention HM300!!

Better sound and flow with No numbers thar are HM300 replicas.
Need different jetting.

My K6 had main 105, needles middle with 341 and stock air filter early 80's.

My K2 assembled this year with Yamiya pipes got my old K6 carbs. Now main 115, needles 1 step richer, 4:th notch from top.

I have a feeling when I end up installing these I'm going to want the Yamiya no numbers instead for the sound. Just means Ill need another 750 to put these pipes on.

When the time comes I think Im going to plug the ends of the exhaust and fill them with oil. Seems like it would be difficult to coat all the different surfaces inside before install.

Photos from KayOne
http://forums.sohc4.net/index.php?topic=131905.0

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« Last Edit: December 07, 2019, 04:21:33 PM by VTCBike750 »
-Adam

1972 CB750 (current project)
http://forums.sohc4.net/index.php?topic=87951.0

Offline Don R

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Re: 4 into 4 341 exhaust from David Silver Spares. Discontinued?
« Reply #26 on: December 10, 2019, 08:20:03 PM »
 Repop,  Repro, same thing. Instructions state put all 4 pipes on the engine flange loosely, use new copper o rings, The new ones sometimes include a tube to slip between the muffler connectors at the rear, I believe it's to make sure they get lined up before anything is tightened, then put in the peg bolts, start at the rear and tighten and adjust a little at a time while moving forward. Then check, and finish tighten. I've needed to thump the front of the pipes at the engine with a rubber mallet through a folded towel to get them even.
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Offline VTCBike750

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Re: 4 into 4 341 exhaust from David Silver Spares. Discontinued?
« Reply #27 on: December 11, 2019, 03:27:23 AM »
Had never heard of repop. I need to get out more. I remember DSS had 341s and 341 seconds on their website a while back. Now it's just a mix of some good, some factory seconds. Why were the repops considered seconds?

Thanks for the instructions.
-Adam

1972 CB750 (current project)
http://forums.sohc4.net/index.php?topic=87951.0

Offline 48lesco

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Re: 4 into 4 341 exhaust from David Silver Spares. Discontinued?
« Reply #28 on: March 09, 2020, 12:09:53 PM »
The 341 pipes were made in Japan, all the pipes were sold so no one has them.

I do have a set. NOS Honda, not repros. Include NOS heat shields. $2,400.- plus an exorbitant amount for shipping unless you want to pick them up in Cleveland, Ohio

Do you still have the 341 pipes and how firm is that price? I'm also in Cleveland and would pick up in person. Thanks