Exhaust Stud Replacement? - Page 2

pete · 11-16-2018, 04:59 PM

Quote:

Originally Posted by Ariel Red Hunter

True. His problem is that the big box stores carry the absolute cheapest quality imaginable. And that is where most people in the States go to look...ARH

yes even NZ is slowly going that way... If yer want something go to
Mita 10 or Bunnings.. because of that alot of the specilized engineering shops
are finding it hard and closeing down.. they are still there and they always will
be but just not as meany as there was 20 years ago..

People seem to have a attraction for buying crap.. then bitch and wine
like a school girl when it craps out..

.

Sochin · 11-16-2018, 09:51 PM

A new head is 87 bucks from CSC, but shipping ends up being 115 etc......just buy more odds and ends until you're up to 100 bucks, then shipping is free.

davisbm2 · 11-19-2018, 07:55 AM

Is the CSC head an exact replacement (does everything line up, are all the dimensions correct?) And if so, is it any better than the head that comes on the Hawk?

Do I buy the one that comes on the TT?

**JerryHawk250** · 11-19-2018, 08:04 AM

It's a direct fit and yes it a better head than the Hawk. Read this thread. http://chinariders.net/showthread.php?t=21696

Sochin · 11-19-2018, 11:57 PM

The only thing you have to make, is an air injection block off plate(Emissions thing on other CG250) that the Hawk doesn't have. I used one from the crate steel that the Hawk came in.

https://photos.google.com/share/AF1Q...RJNHY2bWo1ZGJB

thederrick106 · 03-23-2021, 12:11 PM

Anyone know what size bolts/ studs are used in the head? Are they the same size as the carb side? I ordered a new head for my 2015 RPS hawk 250 i am rebuilding. Old one was fucked up pretty bad.

This is about one of the last things I have to do on my rat bike hawk build!

thederrick106 · 03-23-2021, 12:29 PM

I found this reply in another thread:

Quote:

Originally Posted by Megadan

Since the studs in question are metric (M8 x 1.25) the equivalent of grade 8 (SAE) would be grade 10.9.

On my last Hawk and the current one, I upgraded to stainless steel (A2) studs, washers, and nuts. Much like ARH, I use a double nut (main and locking) to secure the head pipe. I have never had one come loose or back out. The mid pipe mount is also crucial to prevent stud breakage (the one on the frame under the seat area). If that is loose and allows the pipe to vibrate it will put a lot of stress on the studs and increase the chance of, or lead up to, failures. I put two large flat washers on each side of the rubber in order to tighten it down enough without completely destroying the rubber in the process.

http://www.chinariders.net/newreply....reply&p=294479

Megadan · 03-23-2021, 06:57 PM

Good place to source studs https://www.belmetric.com/m8x125-coa...d-c-9_71_1840/

Just match the length dismensions to what you have.

jatgm12 · 12-16-2021, 11:05 AM

Anyone know the size of the studs holding the exhaust pipe to the engine head? Mine have apparently rusted to crap.

Thumper · 12-16-2021, 11:29 AM

One way to help center a drill bit on uneven broken stud is to use a punch. Take your time getting the hole centered. Punch drill, punch, drill...The punch also has the side effect of loosening the threads in the head. I always get some PB blaster or equivalent on there to soak before starting the process.

Thread size should be the same in the head as on the exposed threads. You can use a nut from holding on the flange to see what the size is. Maybe M8 x 1.25 (post 22 this thread)

Thumper · 12-16-2021, 12:47 PM

Quote:

Originally Posted by Ariel Red Hunter

True. His problem is that the big box stores carry the absolute cheapest quality imaginable. And that is where most people in the States go to look...ARH

I think "all-thread" at big box stores is actually zinc. I used 1/4" all-thread to replace battery clamp rods in a tractor. Anything requiring actual torque would fail!

TominMO · 12-16-2021, 01:29 PM

Is it possible to cut a slot using a diamond cutoff wheel in a Dremel? Then use a flat screwdriver to remove the old stud. Just a thought.

TxTaoRider · 12-16-2021, 01:57 PM

I've had pretty good luck using left hand drill bits. The studs will usually come out while drilling into them.

zero_dgz · 12-16-2021, 10:32 PM

Quote:

Originally Posted by Thumper

I think "all-thread" at big box stores is actually zinc. I used 1/4" all-thread to replace battery clamp rods in a tractor. Anything requiring actual torque would fail!

They're zinc plated. Definitely steel. Mild steel for sure, but still. A magnet will tell you.

You're right in that a solid zinc piece of allthread wouldn't stand up to... much of anything, really. It'd make a bitchin' high surface area electrode for zinc plating other things, though!

jatgm12 · 03-29-2023, 11:21 AM

Hey so I tried getting them out and just basically got nowhere. Drilled the hole, tried to remove it, didn't work. Tried to drill it out and thread it, also didn't work. I got a new cylinder head. I figured out their m8 x 1.25 studs and got replacements too. Turns out the intake is a different size. Can someone let me know the intake bolt size and thread pitch? Is it m6? Im not sure. I assume it's standardized.

11-16-2018, 09:51 PM	#17
Sochin Join Date: Jul 2017 Location: Montucky Posts: 209	A new head is 87 bucks from CSC, but shipping ends up being 115 etc......just buy more odds and ends until you're up to 100 bucks, then shipping is free. __________________ 1991 Kawasaki KLR250
	0

11-19-2018, 08:04 AM	#19
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,552	It's a direct fit and yes it a better head than the Hawk. Read this thread. http://chinariders.net/showthread.php?t=21696 __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	1

11-19-2018, 11:57 PM	#20
Sochin Join Date: Jul 2017 Location: Montucky Posts: 209	The only thing you have to make, is an air injection block off plate(Emissions thing on other CG250) that the Hawk doesn't have. I used one from the crate steel that the Hawk came in. https://photos.google.com/share/AF1Q...RJNHY2bWo1ZGJB __________________ 1991 Kawasaki KLR250
	0

03-23-2021, 06:57 PM	#23
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,982	Good place to source studs https://www.belmetric.com/m8x125-coa...d-c-9_71_1840/ Just match the length dismensions to what you have. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	0

12-16-2021, 11:05 AM	#24
jatgm12 Join Date: Jun 2021 Posts: 22	Size? Anyone know the size of the studs holding the exhaust pipe to the engine head? Mine have apparently rusted to crap.
	0

11-19-2018, 07:55 AM	#18
davisbm2 Join Date: Apr 2018 Posts: 54	Is the CSC head an exact replacement (does everything line up, are all the dimensions correct?) And if so, is it any better than the head that comes on the Hawk? Do I buy the one that comes on the TT?
	0

03-23-2021, 12:11 PM	#21
thederrick106 Join Date: Feb 2021 Posts: 9	Anyone know what size bolts/ studs are used in the head? Are they the same size as the carb side? I ordered a new head for my 2015 RPS hawk 250 i am rebuilding. Old one was fucked up pretty bad. This is about one of the last things I have to do on my rat bike hawk build!
	0

12-16-2021, 11:29 AM	#25
Thumper Join Date: Feb 2021 Location: Kansas City Posts: 2,237	One way to help center a drill bit on uneven broken stud is to use a punch. Take your time getting the hole centered. Punch drill, punch, drill...The punch also has the side effect of loosening the threads in the head. I always get some PB blaster or equivalent on there to soak before starting the process. Thread size should be the same in the head as on the exposed threads. You can use a nut from holding on the flange to see what the size is. Maybe M8 x 1.25 (post 22 this thread) Last edited by Thumper; 12-16-2021 at 12:40 PM.
	0

12-16-2021, 01:29 PM	#27
TominMO Join Date: Sep 2021 Location: De Soto, MO Posts: 1,868	Is it possible to cut a slot using a diamond cutoff wheel in a Dremel? Then use a flat screwdriver to remove the old stud. Just a thought. __________________ 2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself
	0

12-16-2021, 01:57 PM	#28
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	I've had pretty good luck using left hand drill bits. The studs will usually come out while drilling into them. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
	1

03-29-2023, 11:21 AM	#30
jatgm12 Join Date: Jun 2021 Posts: 22	Hey so I tried getting them out and just basically got nowhere. Drilled the hole, tried to remove it, didn't work. Tried to drill it out and thread it, also didn't work. I got a new cylinder head. I figured out their m8 x 1.25 studs and got replacements too. Turns out the intake is a different size. Can someone let me know the intake bolt size and thread pitch? Is it m6? Im not sure. I assume it's standardized.
	0