Oil cooling system for hawk 250?

[jatgm12]

Does anyone know of a kit to put a cooling system on a cg250, it's a shark 250 but it has a non-counterbalanced engine (swap with custom engine mounts) so it's essentially a drum brake hawk 250. I have seen some that adapt to where the fuel filter is but I'm not sure what one will fit.

[CheapThrills]

I believe we have simular engines, there are two types of oil coolers I've seen sold for these engines.


One that taps off the valve cover and cools oil heading to top of engine, and another that reroutes oil around the side oil strainer to a cooler for the all the oil flow.



Each as it's advantages. I went with the oil strainer version( https://mymotorcycleblog.com/tbr7-oil-cooler-unboxing/ ), which changed how I changed oil prior to the upgrade, but just meant I started using the drain bolt.


Hope this helps,

[red2003]

Why do you believe you need an oil cooler?

[Megadan]

Does anyone know of a kit to put a cooling system on a cg250, it's a shark 250 but it has a non-counterbalanced engine (swap with custom engine mounts) so it's essentially a drum brake hawk 250. I have seen some that adapt to where the fuel filter is but I'm not sure what one will fit.

There are kits for the CG250, but they are universal fit to the bikes. As CheapThrills mentioned, there are 2 styles. The big defining difference is on how they operate/function.

The Sump drawn style that replaces the filter screen and cap with a fitting that has lines to and from the cooler is the style I have had on my Hawk for about 6 years. They operate on a "vacuum" pull by using the inlet of the oil pump to pull the oil through the entire system from the sump. This is a bit of a unique way of operating an oil cooling system, but it does have a few benefits. One big one is that the system will not spray oil under pressure if it gets a puncture. Obviously the downside of that is that the pump could potentially draw air through the puncture.

The advantage is you circulate the entire oil supply through the cooler, and that cooled oil is immediately fed to all areas of the engine.

The valve cover style is a more traditional pressurized system. Big advantage of this style is that your oil changes remain as simple as stock. The cooler lines are also tucked up high and protected, It takes the oil that is run from the pump up to the cylinder head, cools it, and then dumps that cooled oil on the head, valves, and back down to the sump over the cam system.

Both styles use the same cooler types and mounting systems, and they both are plenty effective.

There are people who will talk about coolers being unnecessary. They somewhat are, but that doesn't mean they aren't advantageous. For one, having ridden both an uncooled, vs. cooled Hawk for thousands of miles in both cases, the oil lives a much much longer life, about double the life or more.

The real place where I noticed the biggest difference, especially on properly hot days (90+ temps_ was generally at lower speed riding, 10-30mph, aka, trail speeds and city traffic speeds, The cooler on my bike is effective enough even at those speeds to keep my oil temps under control.

[Do©Hawk]

I've been considering an oil cooler.
I made a skid plate for my Hawk that reduces airflow around the air cooled engine. I also have experienced shifting issues on a hot 85°+ day after riding on road to and on some local trails. I'm sure it was the low speed 1st and 2nd gear riding on the trail in combination with the skid plate that was keeping the heat from dissipating.

[superjocko]

I detailed the oil cooler mounting on my TT250 in this thread: https://www.chinariders.net/showthread.php?t=33938&highlight=cooler Your bike will likely vary to some degree, but hopefully you might find some inspiration from it.

I chose the valve cover style cooler primarily for keeping the cooler lines out of harms way. This is the one I bought: https://www.aliexpress.us/item/2251832622593989.html?spm=a2g0o.order_list.order_l ist_main.96.7eab1802DA5OH2&gatewayAdapt=glo2usa

As has been mentioned though, either style of cooler is fine.

Prior to installing the oil cooler, I would notice a change in the clutch action and noticeably greater clutch lever freeplay after running the bike hard. After installing the cooler, those concerns have been greatly reduced if not entirely eliminated.

Best of luck on your installation should you choose to go ahead with it.

[Mudflap]

I hate the idea that the oil pump would be sucking air if there was any sort of leak in the system so I use the valve cover type on my CG engine quad. It did spring a leak once and oiled my shoe, but I instantly knew there was a problem.