It is 8.54 ~ 10.12 :1
24:1 or 32:1 the richer the longer the life i like 24:1 for my 1993 yz250
I have a 1988 Yamaha YZ250 and my manual states .028 is the setting that you should use.
Highest and lowest cylinders should not exceed a 10% difference
1988-1991 yz250 motors are completely interchangeable. Some parts like the cylinder head use the same casting from 1988-1996. Note: although interchangeable the cylinder ports and cylinder head combustion chamber shape differ form year to year. The optimum setup for a 1990 yz250 is a 1991 cylinder with a 1992 head.
its either 355 or 373 there are tags on diff that give you numbers
They have Disc brakes both front and back stock they came with Nissin braking system, they use DOT4 brake fluid, if you be more specific with your question I could be able to answer better my email is protechav@yahoo.com
200 psi
100 lb or above
The stock rocker arm ratio for a Gen I Chevy small block is 1.5:1. The marine engines have the same rocker ratio, but use different cams and have bottom ends built to handle sustained RPMs.
you need: fuel compression and spark
50/1
no, you do not need a compression tool to remove or replace them