DIY Exhaust Pipe

[Nikoliki]

I have a small huasheng 4 stroke. And I've hacked up the exhaust, used a diesel heater flex hose, and lawn mower muffler. It's been pretty cool. However the top side had been giving blowing back out of the exhaust. Not sure if it's a big issue or not to have an exhaust leak on these bikes.

Anyhow the pictures are my current fix and I'm not convinced it will hold but maybe be good enough.

Originally I had the small clamp the hose came with on there and some JB Weld muffler cement. Needless to say that didn't hold very long nor was it a good fix.

Question is...

1) How bad is to have exhaust blow out at the top?

2) Should those sturdier clamps hold and if not is there a better, no weld, option?

 

[Gordy]

It's best to not have an exhaust leak. I suggest you go down to your local auto parts store and get some U bolt exhaust clamps of the proper size. Those you should be able to get real tight. And I suggest also adding a bit of JB brand muffler weld in between the pipe and manifold.

 

[Nikoliki]

It's best to not have an exhaust leak. I suggest you go down to your local auto parts store and get some U bolt exhaust clamps of the proper size. Those you should be able to get real tight. And I suggest also adding a bit of JB brand muffler weld in between the pipe and manifold.

The only issue with exhaust clamps is I haven't found any that are small enough. Most clamps are over an inch, the main bike pipe is 3/8ths I believe and the heater hose is 1/4th.

Along the lines of the JB weld muffler weld. Will that dry and cure between the pipes? That was the big issue with the jb weld exhaust cement. It would not dry and cure in the in between areas .

 

[michael whiteman]

Just take your pipe down to your local muffler shop and let them weld it.

 

[Chainlube]

Just take your pipe down to your local muffler shop and let them weld it.

The flex pipe he has doesn't weld, they are very thin metal. The best he's going to be able to do is the hose clamp.

 

[Nikoliki]

The flex pipe he has doesn't weld, they are very thin metal. The best he's going to be able to do is the hose clamp.

I figured that would be the case. It doesn't even magnetize to a magnet, which means it may be aluminum and not really weldable to the steel exhaust port attachment, even if it was thicker.


How hot does the exhaust typically get right there near the engine exhaust port? I found some double sided exhaust tape that might help seal it better, however, it's only rated for 700°F.

 

[Gordy]

I figured that would be the case. It doesn't even magnetize to a magnet, which means it may be aluminum and not really weldable to the steel exhaust port attachment, even if it was thicker.


How hot does the exhaust typically get right there near the engine exhaust port? I found some double sided exhaust tape that might help seal it better, however, it's only rated for 700°F.

That tape will be fine. It shouldn't get nearly that hot

 

[Mudflap]

I figured that would be the case. It doesn't even magnetize to a magnet, which means it may be aluminum and not really weldable to the steel exhaust port attachment, even if it was thicker.


How hot does the exhaust typically get right there near the engine exhaust port? I found some double sided exhaust tape that might help seal it better, however, it's only rated for 700°F.

Diesel heater flex pipe is stainless steel. Maybe a heavy duty hose clamp and exhaust paste?

 

[michael whiteman]

If it's stainless you can weld it. But if you can't find someone with a tig welder then you could braze it yourself. Here's how.............
https://video.search.yahoo.com/yhs/...978ce63bf450048fd5d60d7c63853011&action=click

 

[Chainlube]

If it's stainless you can weld it. But if you can't find someone with a tig welder then you could braze it yourself. Here's how.............
https://video.search.yahoo.com/yhs/search?fr=yhs-fc-2461&ei=UTF-8&hsimp=yhs-2461&hspart=fc&param1=7&param2=eJwtj8tuwkAMRX9lliAxE88zMVmBIB9QdVXEIg1DGOWpJCioX18PrSxZx/deS3Ydbpf8+nGSAFqjveyuPc2ImBFGCww4pWmo/nSiMBKmVkijhKYe3doPJD5nwmdJ1A0/oW3LxApgmzX0t2GdWb8wCQJyRoIzOXs5s2XlOLZ+9d9NWBKrU6Ed2zSPpWt3rA2NZ7WvmmHLqsc0dD6RygmIxebyXk7hfyVeNb9fiQfMfnpzBoWU5wNwiag4YcEz6Sw/pHg6oivQuWPMVzGsQBkOlivzCXZv071CAZh9/QJ3h1Lm&p=can+you+braze+stainless+steel&type=fc_ABD7BF90295_s58_g_e_d040623_n9998_c999#id=1&vid=978ce63bf450048fd5d60d7c63853011&action=click

A very established welder I know tried to weld one of those for a cyclekart, he burnt it up. I think it can be welded, though. Just have to be really careful.