whitetrash Posted November 24, 2008 Share Posted November 24, 2008 Like the title says I am new to this forum, I recently purchased a 1992 WR200 and have a very simple question that I hope someone can provide an answer to- what is the mixing ratio for the gas and oil? The Yamaha race book that came with the bike says 20:1 which seems extremely rich to me, but I'm used to dealing with oil injected machines so I could be wrong. Anybody? Link to comment Share on other sites More sharing options...
JonYorksYAM Posted November 24, 2008 Share Posted November 24, 2008 20:1 seems like quite a lot of oil to run, most bikes I've had over years have been 30:1 - 32:1 Is it a haynes manual giving you the info? cos they are not always correct with the info. Link to comment Share on other sites More sharing options...
chuk Posted November 25, 2008 Share Posted November 25, 2008 20:1 seems like quite a lot of oil to run, most bikes I've had over years have been 30:1 - 32:1 Is it a haynes manual giving you the info? cos they are not always correct with the info. rest assured that 32/1 is correct i even phoned a local motocross shop and they confirmed this as did an online motocross part specialist, unless you are breaking in a new piston or similar(even then its up for debate sometimes) you are better off using too much oil than not enough, ive been using 32/1 in my sons dtr and my own yz250 (similar to your engine) and never had a problem uk metric roughly 5litres petrol to 155mls two stroke and for peace of mind use semi synthetic silkolene or similar. Link to comment Share on other sites More sharing options...
whitetrash Posted November 25, 2008 Author Share Posted November 25, 2008 It is an actual Yamaha owner's service manual that I got the mixing ratio from; 24:1 using Yamalube R or 20:1 using Castrol A747, just seems to be very rich compared to all other two strokes I've had in the past. But then again I've melted down a couple of those motors, maybe its just an over-cautious recommendation to prevent warranty claims when the bikes were new? Link to comment Share on other sites More sharing options...
Moderator YamaHead Posted November 25, 2008 Moderator Share Posted November 25, 2008 Maybe just experiment with mixing fuel.....a gallon @ a time.......although 32:1 seems to be a standard/safe ratio to start with ...... Make sure @ do a plug chop often to prevent running it too lean. Link to comment Share on other sites More sharing options...
chuk Posted November 26, 2008 Share Posted November 26, 2008 It is an actual Yamaha owner's service manual that I got the mixing ratio from; 24:1 using Yamalube R or 20:1 using Castrol A747, just seems to be very rich compared to all other two strokes I've had in the past. But then again I've melted down a couple of those motors, maybe its just an over-cautious recommendation to prevent warranty claims when the bikes were new? if in any doubt about the correct amount of fuel to oil there is a handy online free conversion chart just type in ratio rite and all your amounts for varying oil to gas ratios are on a handy chart. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted November 26, 2008 Moderator Share Posted November 26, 2008 if in any doubt about the correct amount of fuel to oil there is a handy online free conversion chart just type in ratio rite and all your amounts for varying oil to gas ratios are on a handy chart. Can you post the link for that plz Link to comment Share on other sites More sharing options...
chuk Posted December 20, 2008 Share Posted December 20, 2008 Can you post the link for that plz SO SORRY FOR LATENESS OF REPLY I JUST USED GOOGLE AND TYED IN RATIORITE AND THE CONVERSION CHART IS FREE TO USE. Link to comment Share on other sites More sharing options...
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