Hawk 250 Overland Travel Bike? - Page 9

mjstef · 02-29-2016, 12:17 AM

Quote:

Originally Posted by Weldangrind

The picture in the link tells the whole story. The valve cover is replaced with one that has two banjo fittings, and they allow connection to the cooler via braided hoses. Even clamps are connected in the kit, for mounting the cooler to the frame.

It might be wise to search for the version that has a valve between the two banjo fittings, so that the cooler can be closed off in cold weather.

Thanks Weld. These China bikes are all new to me. I wrench on cars, trucks and heavy equipment normally. Never dawned on me that was a replacement valve cover......

mjstef · 02-29-2016, 12:20 AM

For anyone else, More pics in this link.... http://blogpower.cl/original-oil-coo...dirt-bike-atv/

Mudflap · 02-29-2016, 08:49 AM

That oil cooler radiator is the same one that came with my Lifan 140cc engine from DRATV. It evidently had some sort of blockage because the oil pressure caused it to balloon and crack spraying oil all over my garage floor a few seconds after starting it for the first time. Doubt that would happen with the CG engines because of where the oil is tapped and diverted but I'd keep an eye on it.

Weldangrind · 02-29-2016, 10:52 AM

That's a good point. It would be advisable to fill a new cooler with oil before installation, to confirm good flow.

If an oil cooler were to fail out on a ride, it could be disconnected with some simple hand tools, although the banjo fittings would still be exposed. One of the hoses that is routed to the cooler could be re-routed between the two banjo fittings to allow one to continue riding. One litre of oil might be required, so always travel with one.

kohburn · 02-29-2016, 11:34 AM

Quote:

Originally Posted by mjstef

For anyone else, More pics in this link.... http://blogpower.cl/original-oil-coo...dirt-bike-atv/

wondering if this will fit the TT250 I think if I do something like this I would want a low temp thermostatic bypass.

Weldangrind · 02-29-2016, 08:02 PM

Certainly it would. The TT is based on the same CG pushrod motor.

Thermostatic bypass creates complexity. I'd rather have the valve on the valve cover, which would allow me to close off the cooler in colder weather.

mjstef · 02-29-2016, 09:36 PM

Quote:

Originally Posted by Weldangrind

Certainly it would. The TT is based on the same CG pushrod motor.

Thermostatic bypass creates complexity. I'd rather have the valve on the valve cover, which would allow me to close off the cooler in colder weather.

It would take 3 valves unless a guy was able to source a 3 way valve, Then you would need 2.....

kohburn · 03-01-2016, 08:32 AM

it normally involves one valve that opens to allow flow around the cooler. the resistance of flow in the cooler allows most of the oil to bypass it. there are manual bypass valves also and all they amount to is two T fittings in the oil lines with a valve between them.

doesn't get a whole lot more simple than that.

here is an example of a thermostatic bypass valve.

http://www.amazon.com/dp/B008BTJFJ4/...I1DY8YRKYTBGYJ

how it works

Mudflap · 03-01-2016, 09:26 AM

Or you could cover the oil cooler with duct tape during the cold months.

Tranberg · 03-01-2016, 10:01 AM

Quote:

Originally Posted by mjstef

It would take 3 valves unless a guy was able to source a 3 way valve, Then you would need 2.....

Err... No. A hydraulic shunt circuit needs a 3-way valve and a tee.

Oil needs differential pressure to flow, so it won't flow backwards.

A valve made like the animation above doesn't shut off the flow to the oil cooler, only in the bypass.
Even with the bypass valve fully open, part of the oil flow still goes through the cooler.

Weldangrind · 03-01-2016, 11:06 AM

The CG oil cooler with a valve on the valve cover would be the most foolproof. It's a simple lever on top, and when you close it, oil is not routed through the cooler.

I did a quick search, but I'm not finding any examples right now. I know I've seen them, and that's the version I'd choose.

kohburn · 03-01-2016, 11:10 AM

Quote:

Originally Posted by Tranberg

Err... No. A hydraulic shunt circuit needs a 3-way valve and a tee.

Oil needs differential pressure to flow, so it won't flow backwards.

A valve made like the animation above doesn't shut off the flow to the oil cooler, only in the bypass.
Even with the bypass valve fully open, part of the oil flow still goes through the cooler.

true its not a total shut off of flow to the cooler however due to pressure drop across the cooler the majority of flow will go through the bypass. its pretty much the industry standard for oil and transmission coolers in automotive applications.

Wolftrax · 03-01-2016, 12:42 PM

Quote:

Originally Posted by Mudflap

Or you could cover the oil cooler with duct tape during the cold months.

The perfect solution.

Wolftrax · 03-02-2016, 07:51 AM

Quote:

Originally Posted by paulesmann

Have any hand guards worked exceptionally well for the hawk?

I put set of these on:https://www.rockymountainatvmc.com/p...lex-Handguards, they mounted up really easily and appear to be very strong.

SpudRider · 03-02-2016, 01:00 PM

Quote:

Originally Posted by Wolftrax

I put set of these on:https://www.rockymountainatvmc.com/p...lex-Handguards, they mounted up really easily and appear to be very strong.

I love those Tusk D-Flex handguards.

I have them installed on two Zongshen, and two Honda motorcycles.

02-29-2016, 10:52 AM	#124
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	That's a good point. It would be advisable to fill a new cooler with oil before installation, to confirm good flow. If an oil cooler were to fail out on a ride, it could be disconnected with some simple hand tools, although the banjo fittings would still be exposed. One of the hoses that is routed to the cooler could be re-routed between the two banjo fittings to allow one to continue riding. One litre of oil might be required, so always travel with one. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

02-29-2016, 08:02 PM	#126
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Certainly it would. The TT is based on the same CG pushrod motor. Thermostatic bypass creates complexity. I'd rather have the valve on the valve cover, which would allow me to close off the cooler in colder weather. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

03-01-2016, 08:32 AM	#128
kohburn Join Date: Dec 2015 Location: Coastal NC Posts: 537	it normally involves one valve that opens to allow flow around the cooler. the resistance of flow in the cooler allows most of the oil to bypass it. there are manual bypass valves also and all they amount to is two T fittings in the oil lines with a valve between them. doesn't get a whole lot more simple than that. here is an example of a thermostatic bypass valve. http://www.amazon.com/dp/B008BTJFJ4/...I1DY8YRKYTBGYJ how it works __________________ -whatever you do, just be awesome. - 2008 Kawasaki Versys - 2016 CSC TT250
	0

03-01-2016, 11:06 AM	#131
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	The CG oil cooler with a valve on the valve cover would be the most foolproof. It's a simple lever on top, and when you close it, oil is not routed through the cooler. I did a quick search, but I'm not finding any examples right now. I know I've seen them, and that's the version I'd choose. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

02-29-2016, 12:20 AM	#122
mjstef Join Date: May 2007 Location: Lac Du Flambeau, WI Posts: 804	For anyone else, More pics in this link.... http://blogpower.cl/original-oil-coo...dirt-bike-atv/
	1

02-29-2016, 08:49 AM	#123
Mudflap Join Date: Sep 2014 Posts: 1,873	That oil cooler radiator is the same one that came with my Lifan 140cc engine from DRATV. It evidently had some sort of blockage because the oil pressure caused it to balloon and crack spraying oil all over my garage floor a few seconds after starting it for the first time. Doubt that would happen with the CG engines because of where the oil is tapped and diverted but I'd keep an eye on it.
	1

03-01-2016, 09:26 AM	#129
Mudflap Join Date: Sep 2014 Posts: 1,873	Or you could cover the oil cooler with duct tape during the cold months.
	1