rodny51082
New member
livewire_101proof
Member
Probably clip position, needle size is identified with a letter followed by a number between 1 - 9. Sounds like a good spot to start going by posts I've seen people in the past that people were running. Just be cauciouse and read ur plugs when u do it. Good luck.
rodny51082
New member
so i took the carbs off today and had a look to see what they were running for mains. cyl#1 has 175 cyl#2 has 170 cyl#3 has 170. i thought that the purpose of the staggered viper head was to get away from haveing different jets in the carbs. so why would someone do this? i just want to get this right because after i took the head off i could tell the previous owner has burnt down the mag side piston befor and i dont know if i trust how they set this up. with these jets am i more likely to foul plugs?
livewire_101proof
Member
sounds like its probably bigger than needed, what were the fuel screws at? not sure on jetting being staggered, maybee heads have been looked at before, hard telling what u got. im guessing theres no way of getting ahold of previouse owner to ask about the history? how was it burning, plugs are really dark im guessing. in the tech section click on engine, then click on jetting and reading plugs, there are some pics there for examples of what coloring you should have.
Sounds like mains are rich.
Fuel screw settings only compensate some for pilots. Smaller pilots and you can go more turns out on the fuel screw to compensate.
As far as staggered, if it's still a stock head there is no reason for that.
And I was talking about the needle clip position.
Fuel screw settings only compensate some for pilots. Smaller pilots and you can go more turns out on the fuel screw to compensate.
As far as staggered, if it's still a stock head there is no reason for that.
And I was talking about the needle clip position.
livewire_101proof
Member
Yes, correct, guess my mind was somewhere else thinking screws effecting mains. Talking out my arss again. Tends to happen now end then
in a piped viper with stock head, your gonna want to run a bigger jet and slightly richer needle setting in the mag cylinder(one by recoil) it is the hottest running cylinder due to the head design and the increased compression ratio. The center cylinder also has the higher compression ratio. If you check youll see more then most are always blowed up on these 2 cylinders, they were prone to it.
rodny51082
New member
ok so deepen my jetting problem/question, i took another look at the mains and i had read the wrong size on one carb. it is cyl#1 175 cyl#2 170 cyl#3 180(i thought it said 170 on cyl#3 befor). i just dont know why the jets are all different.did the previous owner not know what he was doing or did he do this for some reason. i tried looking up speed works to see if i could talk to a rep or something but i guess they are not around anymore.
sx lover said he was running 162.5 mains and thought he was running rich. so wher would that put me seeing that my mains are more than a few sizes up from him?
should i try running #1 170 #2 170 #3 175
sx lover said he was running 162.5 mains and thought he was running rich. so wher would that put me seeing that my mains are more than a few sizes up from him?
should i try running #1 170 #2 170 #3 175
staggs65
Moderator
what do your plugs and piston wash look like with the jetting that was in it? jets and plugs are cheaper than pistons. personally I'd start with what was in it and tune my way down not jump down multiple jet sizes based on others results jmo
rodny51082
New member
pistons 1 and 2 were a black and brownish color i think they looked good piston 3 was just black. but this is only from an idle. i assume that it might change after rideing it some at higher rmp for a while. but i cant test ride it no snow and doesnt look like we will have any in the near future either. it has been in the 40's and 50's and its almost january
staggs65
Moderator
yep same here in maine. the lake is finally froze over though. a few sleds and ice fishers out there this weekend. gotta get one of my sleds together now to go play.
I'd work my way down from what you got when you get a chance to test. you need a wide open throttle run to check the mains. read up on mrvipers plug reading tips and piston wash reading in the ty tech section
I'd work my way down from what you got when you get a chance to test. you need a wide open throttle run to check the mains. read up on mrvipers plug reading tips and piston wash reading in the ty tech section
rodny51082
New member
i will try to get some pics of the pistons up so you guys can chack them out
rodny51082
New member
Millinocket Rocket
New member
rodny51082 said:
journeyman
Active member
mrviper700 said:
Yes, those are the two that went on mine now 9 years ago. I ran the CPR pipes on mine during the 2003 season but I also had the rear exchanger and a Speedwerx aftermarket head to equalize compression. I don't recall the head squish but it measured around 130-135psi per cyclinder with our two gauges we own. I was running Jeff Simon's recommended jetting but IMHO I caused the problem by accidently leaving my airbox TPI air valves wide open. I had ridden the day before on a 32 deg. day and it was pig rich so I opened them up. I rode the next day and it was around ZERO deg. F and down she went totally forgetting I left them open.
COSTLY!!!!!!