Go Back   ChinaRiders Forums > Technical/Performance > Dual Sport/Enduro
Reply
 
Thread Tools Search this Thread Display Modes
Old 02-21-2017, 06:55 PM   #1
kd2dxf   kd2dxf is offline
 
Join Date: May 2016
Location: Central New York
Posts: 32
Hawk Exhaust Replacement

Work has kept be busy most of the winter, but have been saving up money to add some improvements to the Hawk. I purchased this exhaust system from ebay. If i have read right, the holes for the header need to be milled out to 1/2 inch? I want to do this right the first time. Any advise is appreciated
Attached Images
File Type: jpg s-l1600.jpg (102.0 KB, 449 views)


 
Reply With Quote
Old 02-21-2017, 07:04 PM   #2
timcosby   timcosby is offline
 
Join Date: Nov 2016
Location: robertsdale alabama usa
Posts: 1,007
i would fit it first to make sure they look big enough to me.
__________________
1991 harley heritage softail classic
2016 hawk
kaw h1 400 tripple
13' long chopper in progress
2009 johnny pag bar hog
2004 hd electra glide ultra classic shriner edition
1997 harley davidson 1200 sportster
1972 harley davidson amf sx250


 
Reply With Quote
Old 02-21-2017, 07:06 PM   #3
timcosby   timcosby is offline
 
Join Date: Nov 2016
Location: robertsdale alabama usa
Posts: 1,007
there is also a copper gasket that you want to get. someoen will chime in with a link. about $3.00
__________________
1991 harley heritage softail classic
2016 hawk
kaw h1 400 tripple
13' long chopper in progress
2009 johnny pag bar hog
2004 hd electra glide ultra classic shriner edition
1997 harley davidson 1200 sportster
1972 harley davidson amf sx250


 
Reply With Quote
Old 02-21-2017, 07:29 PM   #4
letsride   letsride is offline
 
Join Date: Oct 2013
Location: Leesville SC
Posts: 832
http://www.ebay.com/itm/HONDA-EXHAUS...lTXvZF&vxp=mtr
__________________
My Stable- 2022 Lifan KPX250 , 2023 Royal Enfield Himalayan, 1992 Honda GL1500 Goldwing, SSR 70 Auto, Kymco Mongoose 90, Honda Four Trax 300


 
Reply With Quote
Old 02-21-2017, 07:50 PM   #5
Sullybiker   Sullybiker is offline
 
Sullybiker's Avatar
 
Join Date: Dec 2016
Location: Western PA
Posts: 363
You might need to get a little bracket extender for the muffler, but some people have got away with bending the pipe for it to fit. Be aware that if you do bend it, it can be in contact with the airbox.


 
Reply With Quote
Old 02-21-2017, 08:41 PM   #6
hertz9753   hertz9753 is offline
 
hertz9753's Avatar
 
Join Date: May 2016
Location: Bismarck, ND
Posts: 868
The holes do need to be drilled out to 1/2". I would take the pipe in and have done. I did it myself and It was a pain.
Attached Images
File Type: jpg 001.jpg (81.8 KB, 352 views)
__________________
2015 and 3/4 RPS Hawk 250. Most people would call it a 2016 but the MCO didn't.


 
Reply With Quote
Old 02-21-2017, 09:36 PM   #7
rav007   rav007 is offline
 
Join Date: Jan 2017
Posts: 13
yes the holes do need to be expanded out a bit, how much? well, thats going to depend on the sweat-shop that put the thing together. i would say between 1/4 to 1/2 a inch is about right.

one thing no one on here (that i've seen) will tell you is that these china "exhausts" are NOT a direct bolt on. mine required a LOT of tweaking to get it so it wasnt rubbing on the engine casing and the back support by the rear brake reservoir. oh and the air box. and believe me, stainless steel does not want to bend at all.

and lastly, if its touching the air box it well melt it (ask me how i know!) my solution was to cut off about 1 inch of the air box, fashion a piece of plastic to fill the gap and used JB Weld Plastic Epoxy to get it all back into shape (dont forget the can of flat black.) unfortunately i couldn't prevent the back piece from rubbing in the back, so to minimize the contact i put a U shape bracket in there so it has less surface to transfer heat and its been ok since then. oh and, heat wrap does NOTHING to prevent direct contact heat transfer other then slow it down a bit.

pictures attached. enjoy. (and the melted look is just my shoddy application of the epoxy, it hasn't melted at all)



 
Reply With Quote
Old 02-21-2017, 10:22 PM   #8
pistolclass   pistolclass is offline
 
pistolclass's Avatar
 
Join Date: Oct 2015
Location: connecticut
Posts: 978
Quote:
Originally Posted by rav007 View Post
one thing no one on here (that i've seen) will tell you is that these china "exhausts" are NOT a direct bolt on. mine required a LOT of tweaking
Its a china bike nothing is a direct bolt on.


 
Reply With Quote
Old 02-21-2017, 11:54 PM   #9
hertz9753   hertz9753 is offline
 
hertz9753's Avatar
 
Join Date: May 2016
Location: Bismarck, ND
Posts: 868
The studs on the engine are about 7mm and the holes in the flange need to be 1/2" for it to fit without cutting off the ends of the flange.

You can call me crazy but I was the first one to buy the RCH exhaust here. It was made for the Honda CRF150F and CRF230F. I took notes from the guys that were buying the stainless steel full exhaust and it led me to ebay to find something that was cheaper and cut weight. It does require mods to make it fit.

What makes this website great is people post what they have done and give other people ideas.
__________________
2015 and 3/4 RPS Hawk 250. Most people would call it a 2016 but the MCO didn't.


 
Reply With Quote
Old 02-22-2017, 06:02 AM   #10
chuck   chuck is offline
 
Join Date: Sep 2015
Posts: 436
Quote:
Originally Posted by rav007 View Post
yes the holes do need to be expanded out a bit, how much? well, thats going to depend on the sweat-shop that put the thing together. i would say between 1/4 to 1/2 a inch is about right.

one thing no one on here (that i've seen) will tell you is that these china "exhausts" are NOT a direct bolt on. mine required a LOT of tweaking to get it so it wasnt rubbing on the engine casing and the back support by the rear brake reservoir. oh and the air box. and believe me, stainless steel does not want to bend at all.

and lastly, if its touching the air box it well melt it (ask me how i know!) my solution was to cut off about 1 inch of the air box, fashion a piece of plastic to fill the gap and used JB Weld Plastic Epoxy to get it all back into shape (dont forget the can of flat black.) unfortunately i couldn't prevent the back piece from rubbing in the back, so to minimize the contact i put a U shape bracket in there so it has less surface to transfer heat and its been ok since then. oh and, heat wrap does NOTHING to prevent direct contact heat transfer other then slow it down a bit.

pictures attached. enjoy. (and the melted look is just my shoddy application of the epoxy, it hasn't melted at all)

I did not have those issues except widening the the holes a 1/4 inch ,I guess the cheaper version is not an exact replica of the pro-circuit the t-4 I'v installed on mine.I used a cobalt drill bit to drill the holes.


 
Reply With Quote
Old 02-22-2017, 08:16 AM   #11
Ariel Red Hunter   Ariel Red Hunter is offline
 
Ariel Red Hunter's Avatar
 
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
Quote:
Originally Posted by hertz9753 View Post
The studs on the engine are about 7mm and the holes in the flange need to be 1/2" for it to fit without cutting off the ends of the flange.

You can call me crazy but I was the first one to buy the RCH exhaust here. It was made for the Honda CRF150F and CRF230F. I took notes from the guys that were buying the stainless steel full exhaust and it led me to ebay to find something that was cheaper and cut weight. It does require mods to make it fit.

What makes this website great is people post what they have done and give other people ideas.
I used condensed milk out of the can to cool the bit and lubricate it when drilling stainless steel. Don't let the drill bit get too hot. Once it starts to heat up, it means the lubricating qualities of the cassien in the milk has been used up. So dip it again. Also, don't forget to buy a copper o-ring for the head/pipe interface. Genuine Honda, please. Same o-ring as fits the CRF230F, and others....ARH


 
Reply With Quote
Old 02-22-2017, 10:51 AM   #12
2LZ   2LZ is offline
 
2LZ's Avatar
 
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,033
Dremel

Here's how I did the exhaust bracket mod on our CG motor.
__________________
"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life."

2007 Suzuki DRZ400S (SM convert)
2009 Q Link XP 200
1967 BSA B25 250cc Starfire
2022 Royal Enfield Interceptor 650
2023 Royal Enfield Scram 411
1948 Royal Enfield Model G 350



Last edited by 2LZ; 05-26-2020 at 12:24 PM.
 
Reply With Quote
Old 02-22-2017, 02:53 PM   #13
pistolclass   pistolclass is offline
 
pistolclass's Avatar
 
Join Date: Oct 2015
Location: connecticut
Posts: 978
Quote:
Originally Posted by Ariel Red Hunter View Post
I used condensed milk out of the can to cool the bit and lubricate it when drilling stainless steel. ARH
On purpose or vision problems? 😀
So what makes milk better than oil?
I'm afraid to ask what you put in your coffee.....


 
Reply With Quote
Old 02-22-2017, 03:57 PM   #14
Ariel Red Hunter   Ariel Red Hunter is offline
 
Ariel Red Hunter's Avatar
 
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
Quote:
Originally Posted by pistolclass View Post
On purpose or vision problems? 😀
So what makes milk better than oil?
I'm afraid to ask what you put in your coffee.....
The cassien in condensed milk with stands the heat of drilling better than dino oil. I'm sure by now they have much better hi temp oils than they had in the 1980's. I put half and half in my coffee. I never liked "canned cow" in my coffee....ARH


 
Reply With Quote
Old 02-22-2017, 04:22 PM   #15
timcosby   timcosby is offline
 
Join Date: Nov 2016
Location: robertsdale alabama usa
Posts: 1,007
i was juggling whether to get new exhaust or de-cat the oem! tihs has made up my mind im going to de-cat the oem. im cheap like jerryhawk!
__________________
1991 harley heritage softail classic
2016 hawk
kaw h1 400 tripple
13' long chopper in progress
2009 johnny pag bar hog
2004 hd electra glide ultra classic shriner edition
1997 harley davidson 1200 sportster
1972 harley davidson amf sx250


 
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:33 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.