03viper159
Member
Just wondering what kind of rpms a guy can safely run, I hear there is a timing retard at 8700, but alot of pipes out there are running 9000 for peak horsepower is this correct?
Viper Rpms
- Thread starter 03viper159
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..SNAKEBIT..
VIP Member
CPR'S running @ 9100
yamaholic22
Active member
if you are stock run it at 8500-8600 at WOT.
Mtnviper
Member
SLP's make they're best power at 8700-8800 for normal jetting. Sometimes if you lean them out (short drag race only), power peak goes up approx 100-150 rpms. Most of the time if you spin'm much over 8900 your loosing power on stock motors with SLP's.
Last edited:
woolyviper
New member
my Viper will run almost to 9000. how do you adjust it downward (primary, secondary?)
blueblooded
Member
add weight to the weights.
yamaholic22
Active member
who did the awesome paint job?
yamaholic22 said:
I have a friend who owns a body shop and before he owned the shop he did a lot of custom stuff on cars, bikes, helmets and all kinds of stuff.
I took the hood off of it the day I bought it and gave it to him and told him "do whatever you want" because I know he was pretty creative.
I knew there would be a lot of vipers on the trails and I just wanted something different.
I think he really did a cool job on it. The Hemispheres logo is my company logo and he threw that on there like I was sponsering the sled.
I really liked the torn look on the one side and the fading checkers on the other. He painted my helmet to match the sled too. The cat logo with the hash thru it really made me laugh qwhen I saw it. At the time I was riding a lot with 2 guys who both are die hard cat guys and he (the painter)somewhat knew one of the cat guys. Problem was when I got the hood back I had to MAKE SURE the thing was going to take the ZR800's since they both bought brand new ones the same year as I bought the viper. The one guy had his running pretty good but the viper still would take him every time so I was happy that at least I was able to pull that off!
It really was a great running sled and had tons of compliments on the trails those few years. I also ran with 2 other vipers for a few days. One guy was running all Hauks stuff and the other went with Bender. I was taking them too. Not by much, but it was faster.
CPR pipes run at 9100 RPMs to get the engine out out the dangerous advanced timing portion of the timing curve. Normally running at 8500-8700 RPMs is fine on a stock viper. If you add tripple pipes (associated extra heat) extended runs at the advanced timing portion of the timing curve can lead to burn downs.