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Discussion Starter · #1 ·
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?

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! :)
 

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I am Spartacus
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Rich is ALWAYS better than lean. If 153's cooked one side, go richer. Run it for short distances and check the plugs, they are the best indicator of lean condition. They should be dark brown, light tan/white is way too lean.
 

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Discussion Starter · #3 ·
Thanks! I think when I get the engine back together I am going to go by some richer main jets. Run it with those and see what happens. Then I will knock down in size til I find the optimum jets. Thanks Again.
 
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