Riva Red pipe on a 650

Pro-pulsion

Pro-pulsion

Location
Ontario, Canada
oxnard111 said:
not back pressure isn't critical on two strokes as far and I understand it... an after market water box is more just a waste of money unless you're gonna run a front exhuast outlet and for a handful of other reasons.
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Actually back pressure is pretty key on 2-strokes...well all engines really. But the thing with 2-strokes is that a part of the proper tuning comes with the right amount of back pressure. That's why you hear about tuned pipes so often. Most 2-strokes rely on what is called a cross scavenged exhaust. The sound wave of the combustion travels through the exhaust faster than the exhaust gases and when it hits the baffles, it bounces back toward the combustion chamber. On it's way back it hits the heavier unburnt fuel charge and again bounces back towards the pipe. The sound wave forces that unburnt fuel charge back into the combustion chamber. A tuned pipe reduces some of that back pressure so that most of the unburnt fuel charge is pushed back into the cylinder with the least amount of exhaust gasses. Stock pipes are only designed to work moderately well so the engine is as easy on fuel as it can be without sacrificing too much engine performance. Tuned pipes allow more air flow (which also means more fuel consumption) but are better designed to give an optimal fuel charge in the cylinder and aim for higher performance.:bigok:
 
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jeepinxj

jeepinxj

Location
Algonquin, IL
I see alright so having a waterbox if I understand correctly will open the flow more being that it has less or more open baffles. Am I really going to notice a difference between a stock or aftermarket water box?
 
Pro-pulsion

Pro-pulsion

Location
Ontario, Canada
The waterbox as far as I know doesn't have baffles in it. It just uses a certain amount of water as a part of the muffling. IMO I would stick with the stock waterbox. If its exhaust performance you're looking for, then check into an aftermarket pipe. That would be the biggest advantage.
 
jeepinxj

jeepinxj

Location
Algonquin, IL
Gotcha thanks pro-pulsion. As far as installing the pipe, i bought one and got a killer deal. I paid 155 shipped for a Riva Red pipe, only problem is I have no instructions which means no torque specs, any tips?
 
Pro-pulsion

Pro-pulsion

Location
Ontario, Canada
Usually if I don't have any specs I go by the sparkplug rule. Thread the bolts in and snug them up, then give an extra half turn, but use a little blue loctite on the threads first. Never use red loctite on aluminum, even the ultralight aircraft inspectors will not disassemble anything aluminum if red has been used. It will make a mess of things.
 
The Timmer

The Timmer

killin sj's
Location
metro detroit
yeah i dont use loctite at all...actually i use antiseize on all my bolts bc i never know when a salt water trip might come up...but yes if you do want to use a loctite only blue...anything else and your torching lol...just tighten them down..the riva pipe will be a bit difficult to install for a newbie status wrencher...be carful,inspect everything,have patients, and all will be good..the waterbox deal is spot on to what propulsion said...and you get a badass sound out of the deal too with the aftermarket waterbox. i run a TDR in my race ski and a factory pipe in my FX1
 
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jeepinxj

jeepinxj

Location
Algonquin, IL
I need bolts for the pipe, there are some different looking bolts that came with it. Any idea where I can get new bolts for the pipe?
 
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