I bought a 97 300ex cheap !! It needs a timing chain,intake valves and a bore job. Im getting a 11:1 piston with new bore. Who out there has rebuilt the 300ex and went back with high performance parts ? How much increase will a cam make on a 300ex ? How fast is the 300ex ?

 

stock 52..

the piston and cam add a good bit..if you really want to make it run get it ported and a 3 angle vavle job..

 

94DGblaster, howd u like the curtis sparks on the 94?

 

A cam and higher compression piston will help. Just make sure that you don't go bigger than +1mm oversize on the piston, i've seen 2 motors come apart that had +2mm pistons in them. The cylinder sleeve gets a bit too thin. Porting would deffinately help, but can get rather pricey. If you want to put alot of hours on your 300ex, DON'T remove the stock rev limiter, no matter what anybody tells you. This will eventually damage the top end of the rod, and guess what, you can't buy a rod for the 300ex from Honda, so you have to buy a new crank(unless you can talk someone like Powroll to put a 250x rod on).

 

it was a great pipe.

seemed to add all around power.

it did stick out too far..and i tore it off doing a wheelie

 

The cylinder got bored to .40 over. I believe it said 1mm on the piston. Im staying with the stock cam and valve springs.