Question on engine temp

[bryan1984]

I am rebuilding a buddy's 2002 400ex. He was asking me about putting a stroker crank in it. His rod needs to be replaced so will have it all out anyway. I am wondering how much temp this is going to gain if any along with the cons of it and who makes the best crank for the $. . Its got a stage 3 hotcam, 416 bore, 11.1 comp, big gun CD I, lrd exhaust. Oil cooler and tank are stock. Still has stock Carb but he is wanting to find a 450r Carb sometime soon. Just curious and sorry if this has already been asked.

[CJM]

Shouldnt change temps much, it just has a longer stroke. A thinner bore such as a 440 will be hotter-but if jetted right most find it fine.

Its all about jetting.

[bryan1984]

Thanks for the reply. Didn't know if we needed to look into the cooling system if we did this or not.

[CJM]

All an EX has is an oil cooler. You can only do 1 of 2 things to make it run cooler:
1. Add a 4" spal puller fan to the oil cooler
2. Bigger oil tank

However the above dont really cool it that much more, maybe 20-25F at best. Proper jetting will keep it cool and running good.