timing key for the 850? - HCS Snowmobile Forums

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Old 08-28-2019, 07:30 AM   #1 (permalink)
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Current Sled(s): 19 XC850, 15 SB ProS 600, 16 Indy 550
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Default timing key for the 850?

Is anyone considering adding timing to their 850 for this winter or is that a sure fire way to throw a warranty out the window and ask for trouble?
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Old 08-28-2019, 08:48 AM   #2 (permalink)
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I experienced DET on a long run on the lake last season even with stock timing. Fuel used was 93 ethanol and mode was non-ethanol 91. Temp was around 20-30 deg F at 900 ft elevation.

This might be okay if you leave the fuel mode in ethanol regular. Then switch to non-ethanol 91 mode with known good 91-93 non-ethanol fuel for short races. I switched fuel modes during this testing. Lost 1-4 mph top speed in reg mode.

https://www.hardcoresledder.com/foru...850-xc-21.html

Not worth the risk for trail riding IMO. I'd work on clutching myself.
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Old 08-28-2019, 03:12 PM   #3 (permalink)
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I had no issues no d.e.t , ran 91 and 93 both non ethanol.
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Old 08-28-2019, 05:31 PM   #4 (permalink)
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go with a 2 degree key.
itll wake the sled up
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Old 08-28-2019, 06:28 PM   #5 (permalink)
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Bikeman just released this today... 😃
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Old 08-29-2019, 10:53 AM   #6 (permalink)
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Current Sled(s): 2015 AXYS Pr-S SB Ann 800, 2019 Indy 850.
Previous Sled(s): 2003 XCR 1100, 2000 XCR 800, 2005 Redline Revolt 800.
Location: SE Lower Michigan
Favorite Riding Area: Cadillac, Gaylord
18-19 Mileage 849 so far
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16-17 Mileage: 1115
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Take a look at the most recent dyno test of a Cat 800 C-Tec. With and without 2 deg key. Problem is that it causes longer to warm pipe up. Plus, it also changes timing by 2 deg over the entire rpm range where it can make an already lean calibration at low rpm even leaner. This also changes fuel injection timing, for better or worse.

They found a better setup by only advancing timing at top rpm using a PCV.

The BMP setup appears to be a better solution.

Meanwhile, Jim at DTR told me yesterday that they are planning a test session today on fixing some of the issues seen on certain Polaris 850s.
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