1994VMAX
New member
- Joined
- Dec 13, 2004
- Messages
- 26
Hi, this is my first post..
I recently put Twin Bender Pipes on my 1994 V-max 500. When I swapped the the pipes in I put 153.8 jets in. I was running 148 or 149, I forget exactly, with stock pipe. My altitude where I run is about 2300 ft above sea level. The chart under the hood says to run 153.8's at my altitude and temperature, stock.
My dealer told me years ago that I could run 148 or 149's at my altitude and that the chart is a little rich. So I went ahead with it and have had no problems. Then I put the pipes on, swapped the jets to 153.8's and not long after blew a piston skirt on my left lung. So I am rebuilding the engine now and wondering if I should change my jetting to a little richer, because maybe my problems came from too lean of mixture? BTW sled has 9000 kms on it, and 4000 kms on top end when it went)
Do you guys think 153.8 jets should be an adequate place to start at? I don't want to run it too lean and blow the top end. Better idea to run rich for a bit anyways. Or do jets make THAT much of a difference that I should be worrying about it? I don't have a chart and don't know where to get a chart for these pipes.
Finally, the pipes are used, probably lack a bit of packing inside, and they are loud. Thats expected though, but I don't know if that makes a difference as to what jets I should be running. Also, I know the engine longevity has been reduced due to the pipes, and I am prepared to pay for it. (like I am now
)
Thanks for any input and sorry about the long post!
I recently put Twin Bender Pipes on my 1994 V-max 500. When I swapped the the pipes in I put 153.8 jets in. I was running 148 or 149, I forget exactly, with stock pipe. My altitude where I run is about 2300 ft above sea level. The chart under the hood says to run 153.8's at my altitude and temperature, stock.
My dealer told me years ago that I could run 148 or 149's at my altitude and that the chart is a little rich. So I went ahead with it and have had no problems. Then I put the pipes on, swapped the jets to 153.8's and not long after blew a piston skirt on my left lung. So I am rebuilding the engine now and wondering if I should change my jetting to a little richer, because maybe my problems came from too lean of mixture? BTW sled has 9000 kms on it, and 4000 kms on top end when it went)
Do you guys think 153.8 jets should be an adequate place to start at? I don't want to run it too lean and blow the top end. Better idea to run rich for a bit anyways. Or do jets make THAT much of a difference that I should be worrying about it? I don't have a chart and don't know where to get a chart for these pipes.
Finally, the pipes are used, probably lack a bit of packing inside, and they are loud. Thats expected though, but I don't know if that makes a difference as to what jets I should be running. Also, I know the engine longevity has been reduced due to the pipes, and I am prepared to pay for it. (like I am now
) Thanks for any input and sorry about the long post!
when you blew the sled where you at WOT or steady throttle cruising??
can you post some pictures of the piston damage??
1994VMAX
New member
- Joined
- Dec 13, 2004
- Messages
- 26
I can't post pictures of my piston's because I lack the technology of the digital camera. The piston that blew was a whiteish/brown colour. The other was a dark brown/black colour. This is why I question if my jets are the right size.. The plugs were same colours as the pistons they went with.
FuzzButt
New member
The blown piston top was "Whiteish/Brown" in color? This is most likely a straight lean burn down. Limited to this cylinder only. The brown/black is what you want with clean areas around the intake ports. Fix the cylinder and replace the piston or pistons and rings. Then look at your carb. Something is not right. Plugged or undersized jets and/or float is not set right thus the main is sucking it dry.
You can get a digital camera real cheap from places like CVS Pharmacy. They sell a disposible digital camera at the photo counter if you need a decent cheap one. It might be cool just to document what you are doing to the sled.
Chris
You can get a digital camera real cheap from places like CVS Pharmacy. They sell a disposible digital camera at the photo counter if you need a decent cheap one. It might be cool just to document what you are doing to the sled.
Chris
1994VMAX
New member
- Joined
- Dec 13, 2004
- Messages
- 26
Yep that was how the colours were. I kind of figured I had a lean mix on the one side which caused it to burn down. In the process of replacing the pistons and pots.
I was planning on taking the carb out and apart, clean it up and go through it, just to be sure.
Do you guys think there is a possibilty that my crank may be bent when the piston burned up?? If so, is there a way to check so that I don't need to pull it out of the bottom? I don't really want to pull it out of the bottom as it would cost extra bucks to put it back together. But if I have to I will.. Just don't want to hassle with it if its not mandatory.
Digital camera just might have to be my christmas present for myself...
I was planning on taking the carb out and apart, clean it up and go through it, just to be sure.
Do you guys think there is a possibilty that my crank may be bent when the piston burned up?? If so, is there a way to check so that I don't need to pull it out of the bottom? I don't really want to pull it out of the bottom as it would cost extra bucks to put it back together. But if I have to I will.. Just don't want to hassle with it if its not mandatory.
Digital camera just might have to be my christmas present for myself...