98 xc 600
This is a discussion on 98 xc 600 within the Polaris forums, part of the Brand Specific Snowmobile Discussion category; Originally Posted by dodger
the xc600s 1997(twin) and 1998 have the exact same curve including the 98 RMK 600
So A guy could be looking ...

Originally Posted by
dodger
the xc600s 1997(twin) and 1998 have the exact same curve including the 98 RMK 600
So A guy could be looking for a 600 CDI too in those same years u listed? Do U have the timing curve for the 99 700? Curious to see the difference

The timing curve on the 600 boxes drops off much faster than the curve on the 700's after 6000 rpm. At 8000 rpm the 600 boxes are at 11* where the 98 700 xc box is at 15* at the same rpm. The 700 RMK is at 16* at 8000 rpm. What do you want to know about the 99 700 cdi? It's different than the 600 boxes too. The timing charts i have show the 98 and 99 xc 700 curves are identical. I have timing charts from the polaris race department for all the 440, 600 and 700 boxes from 98 and 99. No 500 stuff though.

Originally Posted by
1fastxc
The timing curve on the 600 boxes drops off much faster than the curve on the 700's after 6000 rpm. At 8000 rpm the 600 boxes are at 11* where the 98 700 xc box is at 15* at the same rpm. The 700 RMK is at 16* at 8000 rpm. What do you want to know about the 99 700 cdi? It's different than the 600 boxes too. The timing charts i have show the 98 and 99 xc 700 curves are identical. I have timing charts from the polaris race department for all the 440, 600 and 700 boxes from 98 and 99. No 500 stuff though.
I was just curious about the 99 curve as I had read that the 99's were detuned from the 98's, but if the curve's are the same then it must've been cause of the 220 jugs? maybe a tad more comp?, I have the charts for the 98 XC and 98 RMK Is the 97 XC, SKS, RMK identical to the 98 RMK ? Also Above shows the 98 XCR 440 to have the same box as the 97 XC, SKS, RMK 4060144. I know above was said it was much hotter, just wondering why it would have the same number than

Originally Posted by
dodger
now everyone has it and I'm worthless
Steve while you were copying my post I ran to the garage to check my 99....I forgot I had one out there
as much as these fail maybe this should be a sticky
why do these seem to fail so often, i had the same prob. is it just these era of sleds or common on many makes and modles
Originally Posted by
93polarisxlt
Originally Posted by
1fastxc
The timing curve on the 600 boxes drops off much faster than the curve on the 700's after 6000 rpm. At 8000 rpm the 600 boxes are at 11* where the 98 700 xc box is at 15* at the same rpm. The 700 RMK is at 16* at 8000 rpm. What do you want to know about the 99 700 cdi? It's different than the 600 boxes too. The timing charts i have show the 98 and 99 xc 700 curves are identical. I have timing charts from the polaris race department for all the 440, 600 and 700 boxes from 98 and 99. No 500 stuff though.
I was just curious about the 99 curve as I had read that the 99's were detuned from the 98's, but if the curve's are the same then it must've been cause of the 220 jugs? maybe a tad more comp?, I have the charts for the 98 XC and 98 RMK Is the 97 XC, SKS, RMK identical to the 98 RMK ? Also Above shows the 98 XCR 440 to have the same box as the 97 XC, SKS, RMK 4060144. I know above was said it was much hotter, just wondering why it would have the same number than
not sure if this is usful info, but my 98 xc 600 cdi was bad, ran a 99 xc 600 cdi for most of the season, got a 98 box, 98 xc 600 cdi , ran very close to 200rpms faster than the 99 xc 600 cdi @ idle

220 jugs were not on all 98s.
97 700 sks and rmks are the same curve as the 98 700 rmk
thats a typo....even God makes mistakes (go to the mall sometime)
the 98 xcr box should be 4060190
http://www.snowmobilefanatics.com/forum/topic/123227ducaticdicoilcombos

The 97 xc,rmk, and sks are all the same curve, but they are NOT the same as the 98 RMK. They are a totally different animal,as is the 97 xc 600 limited build compared to the 98 xc 600. Less timing in the bottom and they don't spike as high as the 98 RMK. The 98 600 xc/rmk and 99 xc 600 curves are identical. So are the 98 and 99 xc 700 curves. I've heard that some of the 99 700's may have had a little less compression compared to the 98's but idk for sure. As posted above the 98 xcr 440 is part #4060190 and the 97 xcr 440 is part #4060163 and they're the same curves also between the two.

Originally Posted by
1fastxc
The 97 xc,rmk, and sks are all the same curve, but they are NOT the same as the 98 RMK. They are a totally different animal,as is the 97 xc 600 limited build compared to the 98 xc 600. Less timing in the bottom and they don't spike as high as the 98 RMK. The 98 600 xc/rmk and 99 xc 600 curves are identical. So are the 98 and 99 xc 700 curves. I've heard that some of the 99 700's may have had a little less compression compared to the 98's but idk for sure. As posted above the 98 xcr 440 is part #4060190 and the 97 xcr 440 is part #4060163 and they're the same curves also between the two.
So If A guy is looking for one to improve his performance for his 99 700 which one is the best one to get the 97? Which one is the easieast to find but still give a performance over the 99 one? Not a drag sled still trail ridden . Excellent info guys!!
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