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94 MX470 Info

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94 MX470 Info

Postby NHMX470 » February 2nd, 2003, 9:48 am

What is the stock number of teeth on the sprokets in the chaincase. Also mine is running very rich what is the stock main jet size?

Side note: I installed an SC-10 under it, would it make sence to go 1 or 2 teeth larger on the small gear.

Adam

*This Message was edited on 02-Feb-03 03:12 PM by nhmx470*
When this baby hits 88mph your gonna see some serious sh*t!
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94 MX470 Info

Postby 94mxz470 » February 2nd, 2003, 12:00 pm

hey
i have a 94 mxz 470 to what kind of speeds are u getting out of it?whats your rpm when its full throttle? what are the 3 bolts on the cluch set at?1-2-3-4-5-6? if u need some help tuneing yours i can help
mark
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94 MX470 Info

Postby 94mxz470 » February 2nd, 2003, 12:01 pm

hey
i have a 94 mxz 470 to what kind of speeds are u getting out of it?whats your rpm when its full throttle? what are the 3 bolts on the cluch set at?1-2-3-4-5-6? if u need some help tuneing yours i can help
mark
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94 MX470 Info

Postby NHMX470 » February 2nd, 2003, 9:48 pm

I'm not sure what the clickers are set at but it revs out at 7800rpm according to my tach. As far as speeds, my speedometer is not working correctly and is reading about 1/2 the actual speed of the sled.

*This Message was edited on 03-Feb-03 02:51 AM by nhmx470*
When this baby hits 88mph your gonna see some serious sh*t!
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94 MX470 Info

Postby 97Mach1 » February 3rd, 2003, 12:25 am

Stock gearing is 23/44, stock main jetting is PTO 290, MAG 280, pilots are 35's.

Your max RPM should be 7300 rpm, so you should move your clickers down at least 1 number (if you can, if you can't, then something in there is worn out..) They were set stock at position #4.

Good Luck,

Jim
1997 Mach 1
"Three in a row makes them go!"
[i]08 MXZ Renegade XP 800R[/i]
[b]There's Nothing Like It![/b]
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94 MX470 Info

Postby 94mxz470 » February 3rd, 2003, 8:57 am

hey
i phoned my delaer because some one told me mine was over reving at the lowest setting and had no speed (it was reving 7500)and he said it was under reving so i turned my tra's up to the #5 setting he said it should be running up at 7800 ot 8000 rpm so now its running at that and works like it should now it can do 60mph breaking trail before it was lucky to get 110km on a hard pack trail but now it should do 130 km to so
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94 MX470 Info

Postby NHMX470 » February 3rd, 2003, 10:47 pm

I also heard 7800rpm was where it should top out. But if 7300rpm is where the usable power ends and at 7800rpm its just spinning for nothing I could see setting it back. Any more advice or confirmation on the 7800 / 7300rpm would be appreciated.

Adam
When this baby hits 88mph your gonna see some serious sh*t!
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94 MX470 Info

Postby 97Mach1 » February 4th, 2003, 12:14 am

According to my 1996 specification book (from Ski-Doo, I have the factory specification manuals, same one your dealer is looking at, if you don't believe me, I can scan the pages and e-mail them to you) it says 7300 rpm for the MX, and 7500 rpm for the MXZ/formula. Unless something has changed in your particular sled, that's where it makes the most power, and it will drop off sharply from there.

Looking through the manuals, every type 467 motor has the rpms listed at between 7300 and 7500 rpm. The 583's are 7800/8000. I would call your dealer to make certain that he's looking at the right engine and year. (the max rpm is on a different page from the model names..)

Maybe Ski-Doo has issued a service bulletin since then.

On my sled, if I am just 100 or 200 rpm over where the peak power is, I can only do about 100 or 105 mph, and if I am right where it should be, I can do 125 or 130 mph.

I hope your dealer is right, because if he isn't, you'll risk ruining your motor.

I also verified the 7300 rpm with my mechanic (he's been racing Doos for 35 years). He said if anything you should stay 50-100 rpms below the 7300 to make the most power.

Good Luck..

Jim
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[i]08 MXZ Renegade XP 800R[/i]
[b]There's Nothing Like It![/b]
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94 MX470 Info

Postby 97Mach1 » February 4th, 2003, 12:27 am

Also, I just noticed, if you have the type 1ST piston rings you should be at 7300, if you have the 1R piston rings, you should be at 7500 rpm.

You can tell your ring type by the ring end gap. The 1ST ring end gap is 0.2 mm (0.008 in), and the 1R ring end gap is 1.0 mm (0.039 in).
[i]08 MXZ Renegade XP 800R[/i]
[b]There's Nothing Like It![/b]
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94 MX470 Info

Postby 94mxz470 » February 4th, 2003, 4:41 am

hey
i dont know but i m just going to leave mine running at 8000rpm and it has way more power then it did before i changed it and ht people before us had tuned it so it would go slower for a woman driver but it has 1259km on it so far and runs fine
mark
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