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Re-Jetting due to altitude?

  • Thread starter Thread starter gus33
  • Start date Start date
G

gus33

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I believe my '78 GS1000E was run by the P.O. closer to Sea Level. Here in Saskatchewan we are at 1850 FT above. I have yet to check the jetting but maybe it's not a big deal? I've ordered intake boot O-Rings so I'll probably check it then. What should I consider if I was to re-jet? I'm running stock headers with Dunstall replica muffs. Everything else is stock.
 
At 1850 feet, I would just jet it for stock, and maybe just back of a bit on the fuel screw to lean it out just a bit.

.
 
I asked that very same question of Dynojet when I put a stage I kit in my 97 ZX-9. I live in Calgary, Alberta, at 3500ft or so. They said no adjustment was required for my altitude, so you should be fine.

Mark
 
1800 feet altitude would not require any jetting changes.

Earl


gus33 said:
I believe my '78 GS1000E was run by the P.O. closer to Sea Level. Here in Saskatchewan we are at 1850 FT above. I have yet to check the jetting but maybe it's not a big deal? I've ordered intake boot O-Rings so I'll probably check it then. What should I consider if I was to re-jet? I'm running stock headers with Dunstall replica muffs. Everything else is stock.
Click to expand...
 
No changes should be needed for that elevation difference.
Now if that different exhaust flows better than stock you might want to do some specific throttle position runs and read the plugs. Of course, the bike must be tuned well to get reads you can trust.
If it does flow better and effects the jetting, I'd guess that simple richer adjustments at the pilot fuel screws and possibly a 2.5 richer main jet would be all that's needed. I doubt the jet needles would need a change. That's just guessing however. Your exhaust wouldn't need too much of a change I believe, if at all. Test to be sure.
 
Thanks guys, once all the little stuff is done I'll do just that.
 
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