2 degee timing key on ZR 900 - HCS Snowmobile Forums

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Old 09-27-2006, 12:01 AM   #1 (permalink)
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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.
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Old 09-27-2006, 06:01 AM   #2 (permalink)
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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:
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Old 09-27-2006, 01:19 PM   #3 (permalink)
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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.
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Old 09-28-2006, 12:47 AM   #4 (permalink)
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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 ?
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Old 09-28-2006, 06:24 AM   #5 (permalink)
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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.
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Old 09-28-2006, 08:53 AM   #6 (permalink)
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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.
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Old 09-28-2006, 08:54 AM   #7 (permalink)
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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.
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Old 09-28-2006, 10:33 AM   #8 (permalink)
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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.
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Old 09-28-2006, 03:48 PM   #9 (permalink)
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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
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91 mm of bore..76 mm of stroke..8100 r.p.m...any ?'s
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Old 09-28-2006, 11:26 PM   #10 (permalink)
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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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