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Jetting suggestions for my Indy 400

Tuning

 
 
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  #1  
Old 12-31-2007
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Default Jetting suggestions for my Indy 400

Here's how the sled runs: Until the motor is COMPLETELY warm, touching the throttle at any RPM under 3,000 will kill the motor. Coming off of idle when it is warmed up usually involves feathering the throttle. Once you get to clutch engagement RPM, it usually is pretty clean running-maybe a little boggy right between engagement and 5,000 RPM, but not too bad. The plugs are not black, but pretty dark brown.

Here's the carb setup: 210 mains, 030 pilot jet, clips set one ring below the top one, air screws were 2 turns out.

What should I do to make this thing snappy at low rpm's? I don't know about carbs, but I think it's way too rich at lower rpm's. Which thing should I adjust first?
P.S. The carbs are clean, but I do have them off, and I'm in the process of cleaning them.
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  #2  
Old 12-31-2007
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What size carbs are those? 32 or 34mm?

I've never dealt with a 400 but 210 mains sounds huge, 30 pilots seem tiny.

But you say it runs fine above 1/2 throttle....hmmm.... Are your chokes adjusted correctly (Bottomed out)?
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  #3  
Old 12-31-2007
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34mm carbs
I was talking to the Yammi dealer in town, because Poo is closed on Mondays. He looked in the book and said 230 mains, 030 pilot, and clips in the middle is stock. He wanted to know how it ran, and I told him. He basically said I was a retard for wanting to lean out the bottom, and said I was way too lean already.
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  #4  
Old 12-31-2007
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if it's mikuni's then 230's sound right. i would go to the stock specs if it were me, then make sure the pilots are clean, since they (combined with the air screw) tend to control most the fuel below half throttle.

so your at 210 mains, 30 pilots, and the needles in the 2nd position.
when stock is 230, 30 pilots, and needles in the 3rd.
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  #5  
Old 12-31-2007
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what grade fuel are you running and is it oxygenated fuel? What is your compression readings? Your best bet is to go back to the stock settings and run 89 instead of 87 if your fuels is oxygenated or go up one or two sizes on all the jets. You could have a lean bog. Grab a tiny bit of choke when it is in the bottom end bog, if it revs up your lean.
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  #6  
Old 03-18-2008
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I used to have a '88 Indy 400, and it was bored out .020 over. I used the same jetting as it comes from the factory. The only thing I can tell you, is you should have a jetting chart somewhere inside the hood. It should tell you what you should use. If you cant find it it or need more informations, email me, and I will find out more whatever you need. WL
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  #7  
Old 07-25-2008
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my indy 500 says to set the air screw at 3/4 turn out
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  #8  
Old 07-25-2008
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I did get the jetting dialed in later in the year on this sled. I forgot what I did. I think I leaned out the mains, but got a scare and put the 210's back in. I ended up dropping the needles and setting the airscrews and it ran quite well from then on. Until I have to fiddle with it again, I won't really know the setup because I'm not gonna mess with a good thing.
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  #9  
Old 07-29-2008
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^^^ Wise move, "if it ain't broke, don't fuck with it"
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  #10  
Old 07-30-2008
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And here I always thought it was.
"If it ain't broke, fuck with it til it is."
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  #11  
Old 07-30-2008
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Quote:
Originally Posted by RipnChick View Post
And here I always thought it was.
"If it ain't broke, fuck with it til it is."

Same here.. Seems to be my problem sometimes...
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  #12  
Old 07-30-2008
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when it wants to bog, flip the choke with your left hand and see what happens. if it dies its rich, if it peps up its lean.

make sure there is slop at the choke lever as well as the plungers are moving freely up and down.
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