Viper Pipes/What kind is best?

just for info with my benders it was always detonation not lean burndown. i cannot remember off the top of my head what rpm it ran but i know it was close to the timing curve.
 
Mtnviper said:
ViperS, I just check the plugs and wash. Slp's jet spec's are about right on the money.
Also if you pipe it, and the fuel pump vent has been silconed shut. (for the pump freezing issue) I would recommend removing the silcone to let the pump breathe through the vent. IMO, closing off the hole can reduce the maximum fuel flow out put of the pump. Something you do not want to happen with pipes and large main jet's. Instead just shim the pump up off of the tunnel.
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I never did do anything with my '04's fuel pump. I never had any trouble with it. Thanks for the advice.
 
ViperS said:
$400 is a great buy! I've heard a lot of mixed reviews on the various pipes. Seems CPR, SLP & Benders are the top 3 choices. If you run across another set of triple pipes, let me know.

Thanks!
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Absolutley, I got my open for that stuff all the time.
 
bufalobob said:
put bender's on a bunch of sleds. not one problem. MUST install rear heat exchanger & head gasket. MUST bleed cooling system properly. viper cooling system is designed for 120 hp.. pipes add 30 hp.. that's 25% more power. more power means more heat. so realistictly you need 25% more cooling capacity. stock cooling system will not cut it.
it's not enough to just add more cooling capacity - the system needs to be bled properly. this takes time & patience.
bob
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I agree totally!!! I didn't even think about completing this add on with out the extra coolant. All the other guys early on taught us that lesson. I got pretty frustrated woth the bleeding of the coolant thing, but after 7 tries and a couple hours I got it running great. I Have to get the head mod completed and a new track to get the ponies to the ground.
 
bender also sells a tunnel heat exchanger kit in addition to the larger rear heat exchanger. it is two top of the tunnel extrusions which plumbs into the existing factory cooling system. i have this on my 835 srx & 800 sx. it has allowed me to run leaner jetting safely.
bob
 
Question by running cooler operating water temp how does that allow you to run a leaner fuel mixture.If the flame is hot enough to melt i cant see what few degrees cooler water temp will do.
 
brad:
wash is created by residule fuel in the cylinder during combustion. if you do not have sufficient external heat wicking ( radiator/heat exchangers ) then it is necessary to add fuel to to the cylinder in order to keep the piston top from melting and/or the piston from expanding & sticking to the cylinder wall. adding fuel to cool the cylinder is counterproductive, it robs h.p..
the most efficient running motors have ample cooling & small areas of wash at the transfers. remember, two cycles like cool cylinders & hot pipes.
guys will spend thousands of $$$ on power enhancing engine components & totally ignore the cooling system. when h.p. is increased heat is increased. YOU MUST INCREASE COOLING WHEN INCREASING H.P.
bob
 
Bufalobob Thanks for that information. It makes alot of sense.
I am tripple piping my SXR700 with thin head gasket, reed spacers, carbon tech reeds, clutching. I have the rear heat exchanger installed but should I be concerned for piston heat.
 
yamyrider:
if you are mainly trail riding the sxr than forget about the head gasket mod. & just do the rest. the gasket mod makes the engine more fuel sensitive & increases engine heat.
if your using the srx rear heat exchanger you should be ok. spend a lot of time bleeding the cooling system at more than one location.
bob
 
yes exactly as Bob said, i would use the SRX rear exchanger when piping the non valved 700's. In most conditions it will be fine with the stock exchangers, but there are always those marginal times when the temp light will come on if you don't run the bigger one. The bigger one will keep temps lower all the time in comparison to the stocker, which is a good thing. You can get a new srx style one for less than $100, definately worth it
 
bufalobob said:
yamyrider:
if you are mainly trail riding the sxr than forget about the head gasket mod. & just do the rest. the gasket mod makes the engine more fuel sensitive & increases engine heat.
if your using the srx rear heat exchanger you should be ok. spend a lot of time bleeding the cooling system at more than one location.
bob
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Based on my search on the Yamaha microfiche, the '02-'03 Vipers used a cross over tube at the rear, but my '04 has an actual heat exchanger. So I'm assuming that since everyone is animate about making sure they have a rear heat exch on a piped Viper, my sled should be ok? I'd still used the different head gasket though.
 
Just my .02 , i ran the srx heat exchanger on a 02 piped viper for 3 years and never once saw the heat light , and guys that ride with me know i dont need snow to ride :) i took my sled down a dry paved road in newberry one year about 5 miles and never saw the light , as for last year i ran a mt. max exchanger witch is alot smaller and still never saw a light .....just my .02
 
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