Topic: Holes in exhaust.

[Jarrett_Honda]

I just can't catch a break. All four of my pipes on my cb750k5 have cracks or holes in them. #2 is stuck on the bike so I couldnt take them to a welding shop to see if they able to be patched up. The holes are causing back firing.

Would a welder be able to patch up damage like this? Would it be too expensive? Should I just go the JB weld route?

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[540nova]

I would say that exhaust is toast.


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[disco]

I agree with Nova. You're prob only seeing the 'tip of the iceberg'. I bet the insides of that exhaust are rotten. Personally I would stump up some hard earned $ for a Delkevic exhaust. They're stainless steel & they sound awesome! Surprisingly well priced too.

[calj737]

Burnt toast, I'm afraid. 

[Stev-o]

+1 toast.   You could try to find someone to braze it, I've had no luck finding anyone. 

[Jarrett_Honda]

I'm heartbrokern now.

R.I.P original CB750k5.

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[Stev-o]

Don't be depressed, just buy another set!


http://www.ebay.com/itm/1969-1976-HONDA-CB-750-PIPES-MUFFLERS-EXHAUST-SYSTEM-/292084380482?hash=item440195f342:g:QjEAAOSwc49Y7sJE&vxp=mtr

[Don R]

 I bought 2 bikes with 341's and got 2 good pipes out of the 8. One #4 looked really nice but while taking it off the muffler broke off in my hand.

[PeWe]

Find another exhaust of your choice. 4-1, 4-2-1 or 4-2. Delkevic make low cost pipes.
New replica cost some. If going for a replica, buy the HM300 version with larger diffusors to run without. Nice sound and less restricted than HM341

[Jarrett_Honda]

Find another exhaust of your choice. 4-1, 4-2-1 or 4-2. Delkevic make low cost pipes.
New replica cost some. If going for a replica, buy the HM300 version with larger diffusors to run without. Nice sound and less restricted than HM341

Yeah the 300 series pipes are so rare. Like a unicorn.

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[PeWe]

 Replica, can be found at several sites, not only yamiya750.com


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[atm cycles]

I've had repairs done extremely well. Rig welded with stainless patch and rod  polish out and virtually unnoticeable when mounted. That said you have to weigh the cost of repairs. Both times I've had pipes repaired they were very nice 300s. One had the muffler cracked off from header. Another had rust hole on muffler at header.