OzVMX Forum

Marque Remarks => CZ => Topic started by: bigk on January 18, 2010, 03:44:58 pm

Title: '73 250 final drive
Post by: bigk on January 18, 2010, 03:44:58 pm

I just picked up a '73 CZ250 enduro. It has a huge 17t front srocket on it, can anyone tell me the standard gearing and/or the MX 250 gearing please?
Cheers,
K

Title: Re: '73 250 final drive
Post by: JC on January 18, 2010, 03:57:20 pm

M,
Believe it or not, std was (listed as) 18/52 - & (surprise, surprise!) they were waaay overgeared, making the large gap between 1st & 2nd appear much worse.

Later Desert Racer using the same engine ran 15/52

Title: Re: '73 250 final drive
Post by: bigk on January 18, 2010, 07:02:32 pm

Thanks John, I'll use 15/52 as a starting point.
Cheers,
K

Title: Re: '73 250 final drive
Post by: VMX60 on January 20, 2010, 11:17:44 pm

Running a 988 motor in VMX go down to a 13t front will bring the overall gearbox ratio closer a 15t is still way overgeared for MX

Title: Re: '73 250 final drive
Post by: bigk on January 21, 2010, 08:43:48 am

Where's the best place to get sprockets?
Cheers,
K

Title: Re: '73 250 final drive
Post by: 090 on January 21, 2010, 08:49:40 pm

Titman has some from memory. Worth a call.

Title: Re: '73 250 final drive
Post by: Canam370 on January 21, 2010, 09:11:37 pm

I have new 61T available -  if you don't change the c/s sprocket it will give you acceptable gearing.