1VJ's Overheating
 

I have recently heard that 1VJ's (My Bike!) have a real tendency to overheat. Why is this? and can it be fixed with simple modifications. Bearing in mind the bike is about as simple as singles get and it also has an oil cooler why should it have overheating problems?

Thanks for the help in advance...

Dave

yes, overheating was a known weakness of the 1VJ.
reasons:
-the huge tank which covers the cylinder like a warm cap
-the front fender, the rear part is closed
-the position of the oil cooler, from which warm air flows to the right side of the cylinder/-head
-the position of the airbox intakes right above the cylinder head. they suck in pretty hot air
you can prevent it by some simple modifications:
-use the fender of the elder xt-modells (34L, 43F, 2KF/2NF). it has slots in the rear part
-allow 'cold' air to flow into the airbos: remove the air intakes and close the holes with some pieces of plastic. instead, simply leave away the cap on the rear of the airbox. this will bring in cold air from behind. additionaly you can cut a hole in the top-front end of airbox. cover the hole with some mesh.
these are the simple measurements. another very efficient way to cool down the engine temperature is to use the cylinder of later xt600-models. the cylinder with the code 3AJ has much bigger cooling rips and is used in every xt/tt 600 model since 1988.
i have done all this and now i have to cover the oil cooler because when air temperature is below 10°C engine oil will not become warmer than 80°C, no matter how hard i ride.

regards,
klaus

Fresh Air Intake to XT 600
 

Fabricated from David's P40 fibreglass patching compound, takes fresh air from the left hand side from the fuel tank. Discard the original pair of air box elbows which take hot air from the rear of the hot cylinder. The mounting strap is an embedded stainless steel strap, which clamps the new intake between the fuel tank tab and the frame with the fuel tank mounting screw. Has to be two parts to slip air tube between the frame. Re-jet the carb if needed. Aussie made and tested! :thumbup1:

Cheers

Can I have one in PINK please?