02 viper motor weak spots

Y

yamaha big 4

New member
Joined
Jun 9, 2004
Messages
26
Location
n/w ohio
hey guys i have been looking through some posts and was wondering what the weak spots are on a viper motor are ? from what i understand the vipers have better porting then the srx motors and a tripple piped viper puts out more ponies then a stock srx so what usually goes on the viper motors first pistons and Cylinders? because of bad jetting? or weak parts? if you where building a motor starting with a set of 02 cases witch are the same for the viper and srx what way would you go srx cranks rods and cylinders or viper crank rods and cylinders it is gonna be a fast trail machine want to be able to compeat with my brothers f-7 thanks for your input guys it is apreciated
 

Two different engines. Different crank, cylinders, cylinder head, ignition..... I have a piped 02 sx viper and it's fast. Srx 700 2000-2002 are VERY fast but so are the F7. If you have done your clutchwork right you will beat the F7 in top speed with a piped viper or a srx. The F7 will be faster from 0 to somewere between 80-100 mph but then you will pass them :)

With right jetting I think the piped viper is a very relyable sled. I have dropped the carb air went from air box down in belly and have 2x #148,8 and #150 on mag side. Have raced at sea level in minus 15 deg celcius with full throttle over 2500ft without burning down.
 
Last edited:
i understand about the diferances the 2 engines maybe my question is not clear if you were building a project sled and had a choice between the two engines to build up what one would you use and why


second question was i have heard the viper engines are not as reliable as the srx why is that

thanks
 
yamaha big 4 said:
i understand about the diferances the 2 engines maybe my question is not clear if you were building a project sled and had a choice between the two engines to build up what one would you use and why


second question was i have heard the viper engines are not as reliable as the srx why is that

thanks
Click to expand...
If you leave the viper motor stock its very reliable ive seen many used vipers in quebec with 10,000 + miles.
The biggest mistake is to pipe a viper and expect it to be reliable .
 
The Viper motor runs staggered compression and staggered ignition timing, this is most of what makes them unreliable when they're piped.

for a project sled I'd personally go with an SRX motor.
 
I know a dealer who have sold tripple pipes for vipers since 2002. He have sold 27 sets of pipes and he told me that 3 of this sled have burned down. All 3 had opened airbox, splited the head gasket and was jetted to lean. Think that the viper is relyable if you do things right. But a stock viper will probebly last longer than a piped on but then again you loose alot of fun :)
 
YBig4,
if you tripple pipe a viper, just make sureyour clutched (RPMs)to run above the aggressive advanced timing curve of 8800 RPMs when at WOT.
 
SledBoy said:
YBig4,
if you tripple pipe a viper, just make sureyour clutched (RPMs)to run above the aggressive advanced timing curve of 8800 RPMs when at WOT.
Click to expand...

depends on the manufacturer. You sure dont want to be running benders above that.
 
No matter what Viper pipes you install you will need to rejet, reclutch, install a SRX base gasket, and add a rear heat exchanger in my opinion. This is a must for any pipes on the Viper if you want to be safe in all conditions. It also doesn't hurt to run a heat range 10 spark plug instead of the stock 9's. All of the piped Vipers that have left our shop have ran great with no overheating or seizures. Matter of fact on our last trip there was a Viper with SLP pipes that ran 2 miles down gravel without snow and didn't overheat. A stock Viper in the same group not only overheated, but it seized two pistons. The pipes on a Viper are only as good as the person setting them up.
 
Srxspec said:
No matter what Viper pipes you install you will need to rejet, reclutch, install a SRX base gasket, and add a rear heat exchanger in my opinion. This is a must for any pipes on the Viper if you want to be safe in all conditions. It also doesn't hurt to run a heat range 10 spark plug instead of the stock 9's. All of the piped Vipers that have left our shop have ran great with no overheating or seizures. Matter of fact on our last trip there was a Viper with SLP pipes that ran 2 miles down gravel without snow and didn't overheat. A stock Viper in the same group not only overheated, but it seized two pistons. The pipes on a Viper are only as good as the person setting them up.
Click to expand...


what is the differance in base gaskets is the srx one thicker or thiner?

i am getting ready to set up the tunnel now so i am glad you said something about the cooling i need some cooling rails is there an aftermarket set for better cooling or any suggestions on what i should use i am gonna extend everything out to 136 as far as a rear heat exchanger goes is there a sled out there that i could addapt the cooling system off of to my viper

thanks for all you suggestions guys your really helping me out so i dont have to learn the hard way a lot of time and money is going into this project so i dont want to mess it up and have a burn down right away thanks again
 
You must log in or register to reply here.


Back
Top