2 degee timing key on ZR 900

slddog · 09-27-2006, 12:01 AM

As I am rebuilding my 03 early build carb 900 after 7600 miles. I was wondering if anyone has some experiance with advancing the timing 2 degrees. The sled is stock except for some clutching ,gutted airbox,and carbon tech reeds. I need to be able to run on 87 octane. Am I asking for trouble? One person claims I can look for a increase in gas mileage and about 10 hp with no problems. Seems to good to be true. Thoughts are appreciated.

FaSTBoY · 09-27-2006, 06:01 AM

Your gonna have to run premium 91 octane ....also pretty sure you won't see 10 hp Gain...Maybe 1-2 hp might be more realistic :div20:

trdehmer · 09-27-2006, 01:19 PM

Just add an 03 or 04 Mountain Cat CDI. You'll gain HP and Torque. But, you'll need to run 91 octane and larger jets.

BIG MACH ATTACK · 09-28-2006, 12:47 AM

Quote:

Just add an 03 or 04 Mountain Cat CDI. You'll gain HP and Torque. But, you'll need to run 91 octane and larger jets.[/b]

How much of a gain ? I may need to get me one. What about running the Mountain Cat CDI with the two degree key ?

snochopper · 09-28-2006, 06:24 AM

2 deg key is alot cheaper than a 1M CDI, if you do the key and run premium, might as well do the heads while your at it, I have a set already cut if you want them, makes alot of difference.

slddog · 09-28-2006, 08:53 AM

So leave it set to stock timing. As its not the easiest thing to change while in the sled, I dont want to mess with it.The person who said it was safe is a reputable custom engine rebuilder. He advances his up to 5 degrees. Along with the other mods I see the need for premium gas. But in this case its hard to believe 2 degrees would call for premium gas. The gains he mentioned sounded good. I could not afford the porting work at this point which is what I would have gone with.

trdehmer · 09-28-2006, 08:54 AM

Not sure of the gain with the MC CDI, likely a bit better then the 2 degree timing key. No, you can't run the key and the MC CDI - you would burn it down. A 2 degree timing key is cheaper. But if you have to have someone install it for you it will cost $. Its easier to swap a CDI - which if you search around you can likely find a used one. Or find a 2002 or newer CDI and have it reprogrammed to a MC CDI.

MUSKOKA800 · 09-28-2006, 10:33 AM

The fact the slddog, the originator of this string, specified the requirement of running 89 octane fuel seems to rules out both the key and the hot MC CDI.
Fresh high octane fuel is just not guaranteed along the trails and in remote areas of Ontario.

91B x 76S x 8100RPM · 09-28-2006, 03:48 PM

Quote:

The fact the slddog, the originator of this string, specified the requirement of running 89 octane fuel seems to rules out both the key and the hot MC CDI.
Fresh high octane fuel is just not guaranteed along the trails and in remote areas of Ontario.[/b]

:beerchug:
or north of M (U.S.) 10

BIG MACH ATTACK · 09-28-2006, 11:26 PM

Do we have to send the '02 and newer CDI to TRF or can most dealers re-map them to the '03-'04 MC spec?
My heads are cut so i'm already devoted to 93.

09-27-2006, 01:19 PM	#3 (permalink)
trdehmer Super Advanced Member Join Date: Mar 2003 Posts: 3,133 Current Sled(s): 2012 F1100T Retro & 2003 F7 Location: Minnesota Riding Since: 1984	Just add an 03 or 04 Mountain Cat CDI. You'll gain HP and Torque. But, you'll need to run 91 octane and larger jets. __________________ Previous Sleds: 2010 Z1 Turbo LXR 2002.5 ZR900 1999 XC 700 SP 1994 XLT SP 1990 Polaris 500 1990 Polaris 340 Sport 1984 Polaris 480 Trail A Phazer 1969 Massey Ferg Ski Whiz

09-28-2006, 08:54 AM	#7 (permalink)
trdehmer Super Advanced Member Join Date: Mar 2003 Posts: 3,133 Current Sled(s): 2012 F1100T Retro & 2003 F7 Location: Minnesota Riding Since: 1984	Not sure of the gain with the MC CDI, likely a bit better then the 2 degree timing key. No, you can't run the key and the MC CDI - you would burn it down. A 2 degree timing key is cheaper. But if you have to have someone install it for you it will cost $. Its easier to swap a CDI - which if you search around you can likely find a used one. Or find a 2002 or newer CDI and have it reprogrammed to a MC CDI. __________________ Previous Sleds: 2010 Z1 Turbo LXR 2002.5 ZR900 1999 XC 700 SP 1994 XLT SP 1990 Polaris 500 1990 Polaris 340 Sport 1984 Polaris 480 Trail A Phazer 1969 Massey Ferg Ski Whiz

09-27-2006, 12:01 AM	#1 (permalink)
slddog Super Advanced Member Join Date: Nov 2003 Posts: 681 Current Sled(s): 800 etec coming Previous Sled(s): 03 zr 900 08 f 1000 Location: mississauga ontario Favorite Riding Area: anywhere 10-11 Mileage: 2400m Age: 44 Riding Since: 98	As I am rebuilding my 03 early build carb 900 after 7600 miles. I was wondering if anyone has some experiance with advancing the timing 2 degrees. The sled is stock except for some clutching ,gutted airbox,and carbon tech reeds. I need to be able to run on 87 octane. Am I asking for trouble? One person claims I can look for a increase in gas mileage and about 10 hp with no problems. Seems to good to be true. Thoughts are appreciated.

09-27-2006, 06:01 AM	#2 (permalink)
FaSTBoY Super Moderator Join Date: Dec 2002 Posts: 4,090 Current Sled(s): 2012 Polaris Assault Previous Sled(s): lots of Cats Location: Nova Scotia Age: 43 Riding Since: 1974	Your gonna have to run premium 91 octane ....also pretty sure you won't see 10 hp Gain...Maybe 1-2 hp might be more realistic :div20:

09-28-2006, 06:24 AM	#5 (permalink)
snochopper Super Advanced Member Join Date: Mar 2004 Posts: 3,795 Current Sled(s): F-1000 Previous Sled(s): 77 ElTigre Location: Rotterdam, NY Favorite Riding Area: Perkin's Clearing 11-12 Mileage: not enough Age: 53 Riding Since: 1972	2 deg key is alot cheaper than a 1M CDI, if you do the key and run premium, might as well do the heads while your at it, I have a set already cut if you want them, makes alot of difference.

09-28-2006, 08:53 AM	#6 (permalink)
slddog Super Advanced Member Join Date: Nov 2003 Posts: 681 Current Sled(s): 800 etec coming Previous Sled(s): 03 zr 900 08 f 1000 Location: mississauga ontario Favorite Riding Area: anywhere 10-11 Mileage: 2400m Age: 44 Riding Since: 98	So leave it set to stock timing. As its not the easiest thing to change while in the sled, I dont want to mess with it.The person who said it was safe is a reputable custom engine rebuilder. He advances his up to 5 degrees. Along with the other mods I see the need for premium gas. But in this case its hard to believe 2 degrees would call for premium gas. The gains he mentioned sounded good. I could not afford the porting work at this point which is what I would have gone with.

09-28-2006, 10:33 AM	#8 (permalink)
MUSKOKA800 Super Advanced Member Join Date: Dec 2002 Posts: 3,171 Location: Burlington, Ontario, Canada	The fact the slddog, the originator of this string, specified the requirement of running 89 octane fuel seems to rules out both the key and the hot MC CDI. Fresh high octane fuel is just not guaranteed along the trails and in remote areas of Ontario.

09-28-2006, 11:26 PM	#10 (permalink)
BIG MACH ATTACK Super Advanced Member Join Date: Mar 2005 Posts: 160 Current Sled(s): 2009 1200 GSX Location: Berks County,PA. Favorite Riding Area: Old Forge NY.	Do we have to send the '02 and newer CDI to TRF or can most dealers re-map them to the '03-'04 MC spec? My heads are cut so i'm already devoted to 93.

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