My catch tank

[CRF119]

Very cool set up here hate to think of the price tag!

[Pornstar]

Oh man, no more of that 4 stroke palava for me, crf gone, EXC250 2t on the way,no more sleepless nights worrying about valves(not really) or flame outs, or boil overs, or oil coolers, or how many hours ive done on the oil. I feel liberated.

[camchain]

Very cool set up here hate to think of the price tag!

Looks weird but interesting with smaller diameter hoses. Any info on it?

Ha ha Pornstar, feeling of liberation can easily be deflated if you flatten your $600 expansion chamber on a log. Not all beer and skittles in 2-stroke land! Wait untill we have to start buying carbon credits lol.

[Pornstar]

Very true, its a bloody big pipe alright, still ive flattenedmy crf's pipe before,but still the engine is so less complicated, and sorted.

[CRF119]

Na no info im going to ask my good friends at boyds to see if they can find me one and a price. Looks pretty trick!

Ive never had a problem with my CRF valves, But i too will be moving onto a 300ktm for my next bike i think. Just for the 2 stroke smell haha

[tommorth]

looks expensive oill coolers a good idea the extra volume cant hurt ether

[barty5]

Very cool set up here hate to think of the price tag!

that wouldnt be that hard for a radiator shop to make remove bottom tank cut in half across it add in extra length.
as for the core for the oil it will just be a simple tube threaded at both ends and cut and welded in place.
as for the hose the could be bought and made to length at greenlane speed shop

there wont be anything complicate inside the radiator as with a standard cars automatic g/box oil cooler. As for the extra amount of oil carried that would be minimal maybe a 100ml given the pipe diameter.

[camchain]

looks expensive oill coolers a good idea the extra volume cant hurt ether

Hah. I thought that was just some weird water pump hose setup. Think I'd rather run a separate oil cooler, why plumb into something that's already hot? Mate has added an oil cooler behind his front plate on Yamaha dry sump. Don't know where he got it from but it fits neatly around steering head.

[barty5]

Hah. I thought that was just some weird water pump hose setup. Think I'd rather run a separate oil cooler, why plumb into something that's already hot? Mate has added an oil cooler behind his front plate on Yamaha dry sump. Don't know where he got it from but it fits neatly around steering head.

cause your not trying to freeze the oil just cool it down a tad it the same method most car makers use on auto trans and in some cases engine oil coolers you would be surprised how much of a difference it can make seen it on some cars a good 20deg difference between top and bottom hoses on the coolant.

Some of the older XR use to have oil coolers set up on the steering head.

[scott411]

teh head set mounted oil cooler is most likely off a XR400, they had a tidy little unit mounted off the steering head,

for nz type conditions the oil cooler on modern four strokes is a bit of overkill, they run them in the US nationals as they run 35 minute motos is extreme heat, and at extreme pace, they do not bother running them in supercross as the xtreme heat does not build up,

no offence ment guys, but the money would be better spent on suspension setup or riding lessons, as no one on here can go that hard for that long, (me included)

[CRF119]

More looking at it for the wires or other silly tracks. Ive got suspension to go and im almost out of cool stuff to buy for my bike. Other then the new Zeta carbon range i saw the other day lol

[scott411]

oil heat is not normally a problem on the tracks like that is it?, i would think fluidyne bigger radators would be a better option than an oil cooler

[camchain]

I think with older air-cooled engines, oil played a big part in cooling and they had quite large volumes of oil. Just guessing here, but with the newer engines running such a small amount of oil (especially CRFs with separate gearbox/Btm end), doesn't seem like a lot a safety if any nasty overheat situation?

Pretty sure daffyd mentioned (on a wires thread) he had a rad cap with a temp sensor on it CRF119, at least you could keep an eye on temp with that. 10 minute break easiest solution of all. With slow, hard riding in bush/mud, radiator fan seems like a good place to start for some peace of mind, but can you even run one off a CR-R stator? Maybe just use a small battery & a switch, run total loss for those expeditions?

Interesting Scott & Barty, XR400 cooler sounds right. (Suddenly reminds me of seeing the first water-cooled YZ with its nifty little radiator up on the forks) Should have mentioned it's fitted to an air-cooled 500 beast, souped up/high comp & it can run pretty hot.

[barty5]

10 minute break cools things a bit but you have to remember that once the motor stops you get heat soak to everything so it wont take long to get back to the same temp it would need to be more like a 20 min break

[camchain]

10 minute break cools things a bit but you have to remember that once the motor stops you get heat soak to everything so it wont take long to get back to the same temp it would need to be more like a 20 min break

Yeah, I'm told it's not a good idea to kill engine on badly overheated bike. You get a sudden big heat spike (without coolant flowing). Even if you can't ride at a pace to get airflow, better to idle for a bit, then stop would you reckon?