Planet Minis

ducatilover · 09-10-2008, 03:28 PM

Im wanting to make my own custom exhaust and was wondering if anyone made their own custom exhaust using the crf50 header? If so please provide pics.

reynolds_brad · 09-10-2008, 04:03 PM

Quote:

Originally Posted by ducatilover

Im wanting to make my own custom exhaust and was wondering if anyone made their own custom exhaust using the crf50 header? If so please provide pics.

Have you seen how tiny the CRF header is?

I hope your talking about a aftermarket one.

ShortysPop1 · 09-10-2008, 04:06 PM

i hope so too...

VOLK · 09-10-2008, 04:07 PM

Im in the middle of making one.. using a R6 cannister and a SGR X core header

Ill keep ya updated...

Js789 · 09-10-2008, 04:57 PM

same here All you got to do really it make it shorter and bend in down a little bit and weld it back up I doing my on a 70 mini trail

VOLK · 09-10-2008, 05:04 PM

Quote:

Originally Posted by Js789

same here All you got to do really it make it shorter and bend in down a little bit and weld it back up I doing my on a 70 mini trail

Post up some pictures... what header you using? How did you connect the muffler to the header?

ffRich · 09-10-2008, 05:10 PM

Buddy of mine took a CRF50 exhaust and we welded the tabs on for the stock CT exhaust shield. He seems to like it.

TankTheory · 09-10-2008, 05:21 PM

I rocked a crf50 stock exhaust on my ct70 when i first got it, it was alright but super restricting to air flow. I'm sure you can mod the pipe to work tho.

Js789 · 09-10-2008, 07:07 PM

i will asap

ducatilover · 09-10-2008, 07:55 PM

Quote:

Originally Posted by reynolds_brad

Have you seen how tiny the CRF header is?

I hope your talking about a aftermarket one.

Yes. I was planning on using an aftermarket header.

ducatilover · 09-18-2008, 02:19 PM

This should be a good starting point eBay Motors: MINI BIKE PIT BIKE XR50 CRF50 EXHAUST PIPE AND MUFFLER (item 330271724879 end time Sep-26-08 17

17 PDT)

geof · 09-18-2008, 03:39 PM

I have made a few over the years and always started by making a small insert which is a push fit into the exhaust port and the internal diameter is exactly the same size as the exhaust gasket. I use counter bored Allen head screws and it allows for a decent sized pipe to be welded on to the insert and machined back to give a neat finish, be that made of titanium or steel ready for chroming.

I have drawings of the insert somewhere - but it is not hard to draw another one up if you want one. Pretty easy to turn on a lathe and then machine four flats on it using a milling machine, any decent machine shop will be able to knock you one up.

Depending upon what cc you are running you may wish to run a smaller diameter hole and smaller diameter pipe - the one in the ohots below was for a BIG cc engine

Here are a couple of photos of the insert and one of the finished system.

arlindsay1992 · 09-18-2008, 05:06 PM

Pretty neat.^^^

ducatilover · 09-18-2008, 07:17 PM

Quote:

Originally Posted by geof

I have made a few over the years and always started by making a small insert which is a push fit into the exhaust port and the internal diameter is exactly the same size as the exhaust gasket. I use counter bored Allen head screws and it allows for a decent sized pipe to be welded on to the insert and machined back to give a neat finish, be that made of titanium or steel ready for chroming.

I have drawings of the insert somewhere - but it is not hard to draw another one up if you want one. Pretty easy to turn on a lathe and then machine four flats on it using a milling machine, any decent machine shop will be able to knock you one up.

Depending upon what cc you are running you may wish to run a smaller diameter hole and smaller diameter pipe - the one in the ohots below was for a BIG cc engine

Here are a couple of photos of the insert and one of the finished system.

That looks great! Ill take a set of drawings if you have them. Nice bike too.

air50 · 09-18-2008, 11:33 PM

when I get my z i'll have to post pics of the crf chm exhaust I'm gonna try to make to fit on the z.

alexficco · 09-18-2008, 11:38 PM

i have a crf50 fmf4.1 on my trail 70!!!

VOLK · 09-19-2008, 12:40 AM

Js789 when are you posting pix of your custom exhaust setup? Need examples for my setup

ducatilover · 09-28-2008, 07:54 PM

UPDATE: Here is what I have so far: Its an SDG exhaust I picked up for $20 on ebay. It looks like the minigunz pipe and its straight through. Only downside is it points right at the shocks.
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09-10-2008, 03:28 PM	#1 (permalink)
ducatilover 2nd Gear Member Join Date: May 2008 Location: Peoria, AZ Posts: 622 My Mood:	Custom exhaust using crf50 header? Update 9/28 Im wanting to make my own custom exhaust and was wondering if anyone made their own custom exhaust using the crf50 header? If so please provide pics. Last edited by ducatilover; 09-28-2008 at 08:27 PM. Reason: update and add pics

09-10-2008, 04:06 PM	#3 (permalink)
ShortysPop1 2nd Gear Member Join Date: Feb 2007 Location: Santa Clarita, Ca Posts: 774 My Mood:	Re: Custom exhaust using crf50 header? i hope so too...

09-10-2008, 04:07 PM	#4 (permalink)
VOLK 2nd Gear Member Join Date: Nov 2007 Location: Portland, OR Posts: 445	Re: Custom exhaust using crf50 header? Im in the middle of making one.. using a R6 cannister and a SGR X core header Ill keep ya updated...

09-10-2008, 04:57 PM	#5 (permalink)
Js789 2nd Gear Member Join Date: Apr 2007 Location: Salina, Kansas Posts: 759	Re: Custom exhaust using crf50 header? same here All you got to do really it make it shorter and bend in down a little bit and weld it back up I doing my on a 70 mini trail

09-10-2008, 05:10 PM	#7 (permalink)
ffRich 2nd Gear Member Join Date: Jan 2006 Location: Weatherford, TX Posts: 550	Re: Custom exhaust using crf50 header? Buddy of mine took a CRF50 exhaust and we welded the tabs on for the stock CT exhaust shield. He seems to like it.

09-10-2008, 05:21 PM	#8 (permalink)
TankTheory 2nd Gear Member Join Date: Jun 2007 Location: .860. Posts: 549 My Mood:	Re: Custom exhaust using crf50 header? I rocked a crf50 stock exhaust on my ct70 when i first got it, it was alright but super restricting to air flow. I'm sure you can mod the pipe to work tho.

09-10-2008, 07:07 PM	#9 (permalink)
Js789 2nd Gear Member Join Date: Apr 2007 Location: Salina, Kansas Posts: 759	Re: Custom exhaust using crf50 header? i will asap

09-18-2008, 02:19 PM	#11 (permalink)
ducatilover 2nd Gear Member Join Date: May 2008 Location: Peoria, AZ Posts: 622 My Mood:	Re: Custom exhaust using crf50 header? This should be a good starting point eBay Motors: MINI BIKE PIT BIKE XR50 CRF50 EXHAUST PIPE AND MUFFLER (item 330271724879 end time Sep-26-08 1717 PDT)

09-18-2008, 03:39 PM	#12 (permalink)
geof Moderator Join Date: Feb 2004 Location: "Over the Pond" Posts: 67	Re: Custom exhaust using crf50 header? I have made a few over the years and always started by making a small insert which is a push fit into the exhaust port and the internal diameter is exactly the same size as the exhaust gasket. I use counter bored Allen head screws and it allows for a decent sized pipe to be welded on to the insert and machined back to give a neat finish, be that made of titanium or steel ready for chroming. I have drawings of the insert somewhere - but it is not hard to draw another one up if you want one. Pretty easy to turn on a lathe and then machine four flats on it using a milling machine, any decent machine shop will be able to knock you one up. Depending upon what cc you are running you may wish to run a smaller diameter hole and smaller diameter pipe - the one in the ohots below was for a BIG cc engine Here are a couple of photos of the insert and one of the finished system. Attached Thumbnails

09-18-2008, 05:06 PM	#13 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	Re: Custom exhaust using crf50 header? Pretty neat.^^^

09-18-2008, 11:33 PM	#15 (permalink)
air50 2nd Gear Member Join Date: Sep 2005 Location: Torrance,Ca Posts: 519	Re: Custom exhaust using crf50 header? when I get my z i'll have to post pics of the crf chm exhaust I'm gonna try to make to fit on the z.

09-18-2008, 11:38 PM	#16 (permalink)
alexficco 3rd Gear Member Join Date: Dec 2006 Location: Gardnerville, NV Posts: 1,277	Re: Custom exhaust using crf50 header? i have a crf50 fmf4.1 on my trail 70!!!

09-19-2008, 12:40 AM	#17 (permalink)
VOLK 2nd Gear Member Join Date: Nov 2007 Location: Portland, OR Posts: 445	Re: Custom exhaust using crf50 header? Js789 when are you posting pix of your custom exhaust setup? Need examples for my setup

09-28-2008, 07:54 PM	#18 (permalink)
ducatilover 2nd Gear Member Join Date: May 2008 Location: Peoria, AZ Posts: 622 My Mood:	Re: Custom exhaust using crf50 header? UPDATE UPDATE: Here is what I have so far: Its an SDG exhaust I picked up for $20 on ebay. It looks like the minigunz pipe and its straight through. Only downside is it points right at the shocks. </br>

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