Most times you will need to buy heavy duty head studs from the extra compression. They cost around $80 and if you dont buy them usualy the stock ones will pull and make your gaskets leak which = loss of compression. I heard you should switch to the crf cam chain too. Modding a motor will not give you any more speed. It will let you get to your top speed faster. If you want speed you mess with the sprockets. If you buy a high rev cdi you will gain 2-3 mph.

order of stuff that should be dune

pipe
filter
remove air box lid
bore kit
rev box
cam
port
carb

 

NO............. this is the order of stuff that should be done

trx450er

if you want to go even faster.....

pipe, filter, higher comp piston at 500CC big bore,

 

well they sell heavy duty timing chains on ebay.... also where can u get the bigger head studds??? I have been looking for some thanks