Conventional Oil. vs Synthetic Oil
Added comments: If your going to read this post from start to finish, realize this, the stuff I say in the first couple of posts is my first stab at trying to determine what oil to use. This has been a learning process but in the end it looks like a synthetic JASO MA2 oil is the best for performance. For oil weights: go with a 0W40 in the colder climates, go with a 10W40 in the warmer, and in the desert go with either a 15W40 or a 20W50.
From Switched Over to Synthetic Oil post:
I did my first oil change before going out riding today. I don't know what was in the bike from factory but when I put in Honda GN4 10W40 I noticed the bike shifted alot better in automatic and had alot more pep (or engagement) to it when I hit the throttle....maybe its from breaking in. Anyways the shifting was harder but I tend to agree with Sunkagain, the harder the shift the quicker it engages and the less your clutches slip. An oil with a higher viscosity takes more force to shear it, and because its harder to shear it, it engages the clutch plates sooner and transmits power faster. A smooth engagement works only to wear out your clutch faster. Seems counterintuitive but I think you are 100% right Sunkagain.
A conventional oil with the same weight as a synthetic one will have the same measure of viscosity at a baseline temperature but they have different characteristics when it comes to different temperatures, and have different coating thicknesses, yada yada yada....which affect your clutch. Anyways for the conv. and syn. oils with the same weight, at lower temps, conventional oils create a thicker coating then synthetic, but vice versa at operating temps. This is why synthetics reduce engine wear so well, they coat better at operating temps, and are designed this way. Its also the reason to use conv. during breakin b/c you don't operate it at or near WOT for prolonged periods. To get back to what was said, at operating temp. synthetic increases the coating between your clutch plates and it takes longer to engage them, making it smoother. Conventional oil on the other hand has a thinner fluid layer between your clutch plates at op. temp. and results in a more abrupt, faster hookup.
Synthetic has a lower friction coefficient at operating temp and can be used after breakin period is done, but its a double edged sword, whats good for your engine may not be as good for your clutch and vice versa. Personally since the rincon is designed so well I would go with a heavier conv. oil that is better for your clutch because it increases performance characteristics, but change it out more frequently b/c it breaks down faster than synthetic.
Also here is a comparison of viscosity for comparison purposes:
Engine Wt. Centistokes (measure of viscosity)
A higher viscosity oil like a conventional 20-50 will be my choice when summer comes, thats my 2 cents.
07 Rincon with:
Warn multi mount
Champion winch - wired for front or back receiver
Uni air filter
Cost of mods to date: $450