I have just installed the VR6 Silent from Sportisi and would like to share some stuff for whoever that cares to know.
Installation:
1. Right side fairing needs to be removed. The right seat panel is also removed. First time taking it off it's quite un-nerving but do it slowly and carefully so that nothing gets broken. The screws are straight forward but the plastic clips needs a little work. The bottom clips needs a flat head screw driver to pry them up for the center stems, once they are up, it's easy to pull them out. The other plastic clips is at the radiator area, simply push the center stem inwards, n pull out the clips (2 of them).
2. Ori exhaust removal. Remove the 4 nuts at the header. Having the right tools with long connecting shaft helps for the socket wrench. The nuts are not tight at all. Next remove the muffler bolt, and then the center section bolt. The pipes are still stuck at the header block, u gotta push the pipes forward to remove it. It can be a little stuck, so a slight impact with your palm can nudge the pipes off.
3. Install VR6. Mine came with only one crush washer installed at the header section. I had to figure out how to install for the other one. It came with 2 crush washers that looks like donuts. At first, I thought it was CNC machine but they are made of thin strips of Aluminum, laced with some sealing material and then rolled up into a donut. The internal diameter of the washer is smaller than the pipe and so it can't fit. I lined up as best the donuts to the pipe and slowly knock them into position. That's when I noticed the Al strip starts to come off. So, I just cut off some sections of the strip so that the diameter is just nice to fit into the pipe. This is the most difficult part, but it's easy once u know what to do.
A good feature of the VR6 mounting flange is that they are not fixed, are free to rotate. This makes installation easy for mounting to the 4 bolts on the header block. Align with the 4 bolts first, put the nuts back on but don't screw tight yet. Use the bolts to hold the pipe in place and then slowly and carefully align the header pipes into the header bore, once they are in place, tighten the 4 bolts in sequence. Because of the crush washer, I didn't need to tighten very tightly, and the washer doesn't need to be fully crushed. I just crush it a little and the sealing is good.
Next is the muffler. The header pipe has a smaller diameter than the muffler, but they are a tight fit. Slipping them in is not that easy. Then u got to also install the flat gasket between them. Hmmm....how to do that? After thinking for a short while, I rolled up the gasket into the Muffler's pipe but left it's opening a lot wider, like the kacang putih conic wrap. And then I just simply slide the muffler over the pipe, twisting as necessary to fit in. Bolt back the muffler. Done.
Test ride it first before u put everything back on. Upon starting, try to listen for leaks, but mine turned out all right. The sound is loud. VR6 Silent is not silent at all. It is very bassy and fierce, like its about to eat up anything in its path. The throttle response is super when >5000 rpm. Ok ok, need to fix back the fairings.
I checked the coolant level while I am at it, filling up with RO water. Installed back the fairings. I noticed the VR6 pipe is fatter and the fairing is touching the pipe. It's gonna melt if I don't do anything to it. Found some rubber washer for the water faucets, enlarged the center hole and then use it as a washer/spacer to get the clearance. I also had some insulative rubber foam, so, I stick it onto the fairings so that at worst case, the rubber will form the heat insulation.
I noticed the stock system is very heavy. So some weight savings. The power response is great. I had not done anything to the carbs, no lags on the lows but powerful response in the mids. Overtaking cars is a breeze at tight areas. The bike just wants to surge forward. The only con is that is still too loud....I worry for the neighbours.
