Rejetting for altitude and Jardine

[schaefere]

I know, I know, not another reject question. I've searched the forums and the wiki though and can't find a straight answer. I have a 97 gs500e and I just snagged a full Jardine exhaust off fleabay. I'll throw on a lunchbox filter then have to rejet. I'm in Denver at about 5300 ft. Any info on what size jets? I'm thinking 40 for pilots because that seems standard. What about mains?

[schaefere]

Bump. Any suggestions, or should I just pm The Buddha?

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[radodrill]

The wiki indicates 40/150 for a LB and perf exhaust; so that should be a good starting point.

The Buddha has the most rejetting experience (mine is limited to the newer 3-jet carbs); so it wouldn't hurt asking him as well.

[BockinBboy]

I recall a thread awhile back that dealt with a member rejetting his bike for the altitude, then returned back down a while later, and rejetted once more... and I'm sure the higher altitude was the same area as the OP... I just can't seem to find the thread.  But I'm thinking Buddha was the one that helped with that particular case.

- Bboy

[radodrill]

Another consideration is that at higher altitudes the air is less dense; so you need less fuel (smaller jets) compared to sea level conditions.

[The Buddha]

I know, I know, not another reject question. I've searched the forums and the wiki though and can't find a straight answer. I have a 97 gs500e and I just snagged a full Jardine exhaust off fleabay. I'll throw on a lunchbox filter then have to rejet. I'm in Denver at about 5300 ft. Any info on what size jets? I'm thinking 40 for pilots because that seems standard. What about mains?

Oooo 5300 ft. How did the bike work with the stock pilots and stock everything.
Y'know they sell that 85 octane over there just for this reason. You are supposed to be able to treat it as normal, cos your gas has been formulated for that.

Anyway no more than a -1 from ideal. So your 37.5/122.5 stock should be ... gasp ... perfect for a stock bike.

Cool.
Buddha.

[The Buddha]

So the thought is this -

Stock bike - stock jetting should be perfect.
Pipe - stock jetting as well, maybe a little air screw openage.

Pipe and K&N - maybe 147.5 mains, stock pilot and remember these are not the same 147.5 as the later year bikes. Different body and while close enough, I'll not run the 01+ 147.5's in em, I'll buy 147.5 large round slotted mikuni mains.

Try the steps out and let me know.
Cool.
Buddha.

[gsJack]

My 97 and 02 GSs screamed thru the Smoky Mtns for many miles at altitudes up to 6500 feet.  They loved it up there running stock all the way.  I live OH at 5-600 feet.

JP and me in 03:

[schaefere]

The bike runs nicely once warmed up, but is pretty cold blooded and warm up time is considerable. I read here that opening up the pilots should reduce warm up time.

I've been putting 91 octane in it, but I'll see how it likes 87 or 85.

I'll put the pipe on when it arrives and report back.
I thought altitude would make this more complicated but I'm happy to hear it actually cancels out the problems with the bike running lean!

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[The Buddha]

It may not be any more miserable than the rest of us he he ...

Make observations, then make 1 change and observe - I did that and landed where I typically tell people to go ... but I was also smack dab sea level. The altitude issue hasn't been exactly measured (atleast not that someone has done and posted).

Cool.
Buddha.

The bike runs nicely once warmed up, but is pretty cold blooded and warm up time is considerable. I read here that opening up the pilots should reduce warm up time.

I've been putting 91 octane in it, but I'll see how it likes 87 or 85.

I'll put the pipe on when it arrives and report back.
I thought altitude would make this more complicated but I'm happy to hear it actually cancels out the problems with the bike running lean!

Sent from my HTC One using Tapatalk

[schaefere]

Good god damn! Put the Jardine  on and that thing purrs like a kitten. A giant pissed off fire-breathing kitten! Install was easy and other than the sound, power delivery is much smoother. It does pop quite a bit when I let off the throttle at higher rpms.

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[The Buddha]

Well then purr away ...

Oh yea we still take credit for "fixing your jetting".

Cool.
Buddha.