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Premix Ratio
Posted: April 27th, 2009, 5:42 am
by CR500PHIL
I am sure this must have been covered before I looked and cannot find it. I have a 1989 CR500 engine in the AF conversion I am building and the manual calls for 20:1. I threw some of my YZ250 40:1 pure synthentic premix in yesterday - (I have never had this engine going and it started right up and even idled and I haven't done any carb adjustments yet). What do you guys recommend as a mixing ratio? Do you think I am fine with 40:1 with pure synthetic premix or should I go with 32:1? I use PJ Goldfire pure synthetic oil - the cleanest and best I have used. I have used this for years and according to the compression in my YZ 250 it offers great protection.
Posted: April 27th, 2009, 6:29 am
by redrocket190
Posted: April 27th, 2009, 7:20 am
by KE 336
X2 There are guys running higher than that. Look here.
http://www.bannedcr500riders.com/board/ ... php?t=6135
Posted: April 27th, 2009, 5:50 pm
by nmdesertrider
I just use 1/2 a quart in a 5 gallon jug. Why make things complicated?
Posted: April 28th, 2009, 8:34 am
by dannygraves
I run 44:1 927 and couldn't be happier.
used to run 80:1 chev per dewaynes recomendations, but found that I lost compressior pulling hills in the dunes.
Posted: April 28th, 2009, 6:54 pm
by ISBB
i used to run 44:1 but got tired of measuring and mixing.. so i went to 40:1 one of the small bottles of 927 to 5 gallons of gas and walla
Posted: May 2nd, 2009, 3:24 am
by TYSTYX
927 at 40:1
Posted: May 4th, 2009, 3:27 pm
by yota
MX2T 40:1
Posted: May 4th, 2009, 4:25 pm
by torque monster
CR500 - Amsoil Dominator 50:1 - this bike will be on the pipe 24/7 as it is a supermoto bike so I didn't want to push the ratio that hard on a WOT bike like I do my woods bike.
I run the 100:1 amsoil in my KTM 300, looked at the power valve and cylinder last night after 30+ hours and it looks perfect. I am a believer.
Posted: May 4th, 2009, 6:10 pm
by Nodge
Is 32:1 too much?
Seems to be working nice for me.
Posted: May 4th, 2009, 9:11 pm
by AlisoBob
Nodge wrote:Is 32:1 too much?
Seems to be working nice for me.
The hardest thing to lube is NOT the piston, its the Con Rod "Big End" bearing.
32:1 will keep this lubed.
You can tell bikes run at 80:1... the con rod thrust washers are gone.
Racing karts turn lots of RPM, under lots of loading.... some run 15:1 to keep the rod happy.