32:1 Or 24:1

[gurny]

Ok I mix gas and oil 24:1 with my mods would it be better to run 32:1? Also would I have to adjust my jetting? Thanks

[BenBB]

It depends on the oil you're using (some are made for specific ratios), but you probably won't see much difference between the two ratios. 32:1 is probably the most commonly used ratio, and should be a good balance between lubrication and oil used (you'll go through less oil per volume of fuel). Some argue that lower ratios like 20:1 or 24:1 makes more power because the oil helps seal the rings to the cylinders and allowing less blowby, but I haven't seen any proof yet. The higher ratio will probably decrease exhaust smoke a little as well.

 

It's not a drastic change so chances are you won't need to rejet, but it's always a good idea to double check the jetting; 32:1 will be slightly richer from an air/fuel standpoint (less oil so more fuel). At most you're looking at one size leaner on the mains, but more likely you may only need to adjust the airscrews. If you decide to change I'd keep the current jetting and see how it runs. Good luck.