Premix Ratio

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CR500PHIL
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Premix Ratio

Post 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.
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redrocket190
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Post by redrocket190 »

http://www.maximausa.com/technical/oilmigration.html
40:1 is fine.
Michael Stiles
2007 Honda CR500R-AF
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KE 336
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Post by KE 336 »

X2 There are guys running higher than that. Look here.
http://www.bannedcr500riders.com/board/ ... php?t=6135
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nmdesertrider
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Post by nmdesertrider »

I just use 1/2 a quart in a 5 gallon jug. Why make things complicated?
03 CRF450/85 500
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dannygraves
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Post 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.
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ISBB
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Post 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 :D
97 Steel 500 that wants to be an AFC
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TYSTYX
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Post by TYSTYX »

927 at 40:1
99 CR500R
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yota
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Post by yota »

MX2T 40:1
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torque monster
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Post 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.
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Nodge
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Post by Nodge »

Is 32:1 too much?

Seems to be working nice for me.
Yah, I'm from Saskatchetoon!

MRE 02 250/500 conversion, pulse injector, twirp porting, coolhead, MRE ignition, blah blah blah blah... www.millarengines.com
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AlisoBob
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Post 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.
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