reddog
New member
I may just be plain nuts but im sick of little 33mm carbs so i put 38mm carbs off a 98 macZ on my o2 viper er it seems to run good, still working on jetting but unable to run my T.P.S sensor (will this hurt me???)
also not running the adjustable sensor deal thats at the end of the stock carbs. cant ever remember the name of it. (will that hurt me??) I was told that it would make me run my timing at full advance, but could i just jet it out? my viper has aann pipes little clutching peak power head 22cc and im running UNI pro filters instead of the air box.
also not running the adjustable sensor deal thats at the end of the stock carbs. cant ever remember the name of it. (will that hurt me??) I was told that it would make me run my timing at full advance, but could i just jet it out? my viper has aann pipes little clutching peak power head 22cc and im running UNI pro filters instead of the air box.
grapeape
New member
Yep, your nuts, LOL. It ran good before, why mess with it?
mountain_mod_viper
New member
I've got the mach z carbs on my viper also. I ran for a while w/o the tps, but after talking to a few people, I decided to rig it up. I used a cutler's performance tps block and rigged up a one into two throttle cable (mine is an 03 so it just had a single cable to the throtttle and a separate one to the oiler). I run the tps block with the extra leg off the throttle cable. The Cutler's tps block is designed for a polaris or cat tps sensor which rotates opposite the direction of the yamaha sensor. I had to use a polaris tps and swap the two outer wires going into the sensor. This gets everything back in the correct spot as far as the readings that the sensor sends. I measured the resistance of the yamaha sensor at wide open throttle and set the polaris one the same. At idle, the resistance is nearly the same also. The polaris and yamaha sensors have the same resistance values, but they are just 180* from one another if that makes sense. It was a pain in the @$$ but I've been running it for 2 years now w/no problems.
I was worried that without the tps, it would cause more timing at partial throttle which could cause problems. I may be wrong about this, but I wanted to be safe, rather than sorry. If you need any pics of my setup, pm me with your e-mail and I'll send them to you.
ps. I also rigged my airbox back on because it didn't seem to run as good with the pods. I used the airbox-to-carb boots from a mach Z.
I was worried that without the tps, it would cause more timing at partial throttle which could cause problems. I may be wrong about this, but I wanted to be safe, rather than sorry. If you need any pics of my setup, pm me with your e-mail and I'll send them to you.
ps. I also rigged my airbox back on because it didn't seem to run as good with the pods. I used the airbox-to-carb boots from a mach Z.
Yamaha designs the engines to "breathe" properly with smaller carbs and higher intake air velocity. Sure you can redesign them, but be prepared to mess with it a lot. You will likely find at least one condition that it will not work well.
That TPS is a primary input sensor to the complex 3D ignition timing map. I would not run without one, unless I studied the map carefully, and chose a "fixed" throttle position signal to run all the time that was safe. This would of course require a little circuitry anyway.
That TPS is a primary input sensor to the complex 3D ignition timing map. I would not run without one, unless I studied the map carefully, and chose a "fixed" throttle position signal to run all the time that was safe. This would of course require a little circuitry anyway.
Junior
New member
there was an infamous thread on this topic a couple years ago, it was where the Junior/Mrviper rivalry started I think, I just looked for it and couldn't find it.
there IS a way to get the TPS to work, and IIRC it was something very simple, flipping it upside down maybe? You could PM SRXtreme, he's running that set-up on an SRX motor, wouldn't be able to help you with jetting, but he could help you get the TPS and TORS working.
there IS a way to get the TPS to work, and IIRC it was something very simple, flipping it upside down maybe? You could PM SRXtreme, he's running that set-up on an SRX motor, wouldn't be able to help you with jetting, but he could help you get the TPS and TORS working.
reddog
New member
grape yes it ran good last year but its that blue viper of skidoo boy and the red viper of bushmans im trying to stay ahead of.(what did you do to your thumb)
worked on my jetting and im running stock jets for a moc Z 380on the mains. right now the mag side is really lean and center and pto are gettting way to much fuel i ran 158.8 mains in my stock carbs but the lean look out of the mag side is wierd with the others really wet with fuel. any thoughts?
worked on my jetting and im running stock jets for a moc Z 380on the mains. right now the mag side is really lean and center and pto are gettting way to much fuel i ran 158.8 mains in my stock carbs but the lean look out of the mag side is wierd with the others really wet with fuel. any thoughts?