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1227
Joined
4/3/2010
Location
Princeton, IN
US
Edited Date/Time
8/25/2014 3:35pm
I have a 2013 KX450f and the Premium gas around where I live sucks.... Thinking about buying some vpr fuel... It's leaded/oxygenated fuel though. Is that ok in my bike? Anyone else tried the new vpr fuel they have? I'm trying to figure if I should get that or the VP t4 fuel.... The t4 is unleaded... any suggestions?
http://www.vpracingfuels.com/download/Motorcycle%20tech%20flow%20chart_…
http://www.vpracingfuels.com/motocross.html
The Shop
I don't like the white residue it leaves in the muffler though. When I had the ecm remaped for the gas and parts, I original thought he didn't richen it up enough.. When I saw the white residue, I thought my bike was running super lean, it wasn't, it's just the lead. No worries.
sunocco 112 supreme leaded is a show in for VP C12 in 2-smokers.
for me, the sunocco stuff is easier to find and cheaper, but the VP stuff is good also.
pump gas is utter crap these daays
I'm not an engine builder or a fuel expert -
I was taught lead is GREAT for ALL motors because lead has a huge ability to keep things lubed. Remember, the lower the octane, the more power, but less detonation resistance. I went from the 100 unleaded I run in the 2 stroke to 110 leaded and didn't mind the difference, but the 100 unleaded has more throttle response. I was running U4.4 in the 4 stroke and LOVED it.
I'm going to try U4.4 in the 2 stroke and give her a go.
Pit Row
With pump gas, bad deposit build up.
Anybody who remembers when cars switched to unleaded witnessed the lifespan of valves in car engines being cut in half when they switched to unleaded. The side effect of lead is that the coating on the valve gives a surface to wear while running rather than wearing away the face of the valve and seat. High spots wear faster and low spots fill in slightly improving the valve seal without wearing the faces.
Modern cars have steel alloys that are way better than they had in the late 70's so it's not an issue for any car built after 1980. An engine that is subject to high wear on the valve faces and seats (Ti Anybody?) should benefit from a little lead.
Lead also had a bad side in cars as it coated every garden and school playground with lead back before 1980. If you want to know why you dad is a little forgetful, this could be some of it.
Do a web search. This is what I found:
Oxygenated fuels can also be harder on components in your fuel system. It's probably because oxygenated fuels typically contain greater amounts of methanol in the blend, but you will need to keep an eye on rubber components like the power valve plunger, carburetor gaskets, and your fuel pump and pressure regulator. Oxygenated fuels aren't as corrosive as alcohol fuels, but they certainly are more aggressive than standard race gas. And if you are racing an older fuel cell, you may need to consider replacing the foam. Newer foams are unaffected by new fuel blends, but older foam can be dissolved by oxygenated fuels. If you start running an oxygenated fuel and notice your engine stumbling or trash in the carburetor, make sure to check your fuel cell.
Read more: http://www.circletrack.com/enginetech/ctrp_1212_oxygenated_racing_fuels…
I drain the gas from the bowl after the race day is done, but leave it in the tank because I'm too lazy. However, in the off season, I will drain the tank and carbs completely.
This is with VP113, MRX01, MRX02, and MR12.
I drain the bowl after a day of riding with ANY fuel.
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