cz250

hi guys. whats the best pre1974 motocross bike? i have always raced huskys {1973 cr450} but have just purchaced a 1972 cz250 with lots of modifications and i reckon it beats any other pre1974 bike! whats your opinions guys?

I found this website for you. This is a list of the best pre-1975 dirt bikes. A very interesting list. Only two on the list I've ever rode (WR400 and MX360 Yamaha).

http://hubpages.com/hub/Vintage-Dirt-Bikes

I have been racing Pre74 for the last 15 years and I am afraid to say on a Husky site that CZs are probably the fastest and also seem to be very reliable
Just to qualify that statement you will still need to stretch that wire long and hard

The bottom end is bullet proof, it's the only bike I am aware of that can be shifted wide open without flying apart.
A friend rode for the US CZ Importer in the early 70's and I was asking him about his shifting(it appeared he shifted it wide open!... no clutch, throttle blip,etc)... he verified he did so I tried it on my 74 mag... 5 cross country races later I replaced 2,3,4th gears... only on a CZ would I do that again!

Your 72 is a good bike. The only limitation is the 4 speed gearbox, BTW which is indestructable. The 5 speed is better because of the close ratio's for racing. I raced CZ's from 1986-2000 in the 250 vintage class. I won the CZ World Championship 250 expert class in 92 on a 73 which was highly modified. I do know a few tricks to these bikes.

The only problems that I ever had is that the dry side crank seal goes out quite often. There is a whishbone looking spring on the shifting rod that breaks occasionaly,(twice for me) and the clutch seal behind the clutch basket can be a real PITA if it is not installed correctly, it will let oil on the dry clutch and make it slip. CR Hi-Performance has a wet clutch conversion that eliminates this. If you have a points ignition get an electronic one. That is a real weak link.