Thread: Timing on the 1200
05-11-2007, 09:45 AM #1
Timing on the 1200
After looking for an answer as to why the MAG cylinder deto'd in my TX, I've now turned my attention to the timing. I noticed that the Matrix timing is only 12 degrees at 7000 rpm. My "limited" curve from Randy is 15* at 7000 rpm and 28* at 3000. What are the rest of you running for timing on the 1200?...especially with tripple pipes? Wondering if I'm going to have to back it down a touch to run pump gas?
05-11-2007, 10:45 AM #2
What is your highest advanced #? You may be runing it at the highest degree advanced while crusing and getting the mag hot and detonating. Might need to run a splash of race gas. Do you have the cooling mod done?
05-11-2007, 04:32 PM #3
There are variables, but what does it flatten out at above 7,000rpm, or is 15* your final flatline?
I ask, because that timing you list is correct, for "limited" applications. However, at 7500rpm like you're running, the timing should kick back to 13*, if not 12*.
Call me Crazy, but I will never subscribe to the belief that Factory Pipe triples can be run at 15*, under load, above 7,300rpm, indefinately on pump gas.
05-11-2007, 08:17 PM #4
Thanks for the replies. Those are the only two numbers I have. I'm not sure what it does after 7000 rpm. I'll have to get more detailed info from Randy (he was busy today). Crazy, do you know what the Polaris sleeper "130" box does? Randy suggested rolling the timing plate back a few degrees, but you know what that involves w/ the Virage tripples! I'm also wondering if the timing in the midrange is too hot? I don't want to pull out too much timing and take the "hit" away...
05-12-2007, 12:09 AM #5
I think you're going to find if you run less timing and maybe even a little less compression you'll be 92 octane ready BUT I guarantee you will NOT like the results.
By the time mine was actually 92 octane compatible, I think a canoe with a paddle could have done better. LOL
I think the fuels from long ago (when the pipes were developed) were much better in terms of fighting off detonation. Couple that with a second passenger, heavy rider, heavy engine load or towing and kiss that cylinder good buy again.
I've been through it too many times to try and go back to the drawing board, especially since race fuel smells sooooo good.
05-12-2007, 05:39 AM #6
05-12-2007, 06:30 PM #7
Well, I'm going to mix in some race fuel, at least while I get it dialed in. I usually do the same thing with my sleds, when the combo is new...Should have done it here, but the stations with the race fuel hadn't received their batch for the summer. I try to keep my sled combos conservative, because you can't buy race fuel in the boonies when you're on a 250 mile trail ride. I love the DET (Polaris's Detonation Elimination Technology for those who arent sledders) system on my 600HO. You can keep jetting down until you see that light, then up one. So far so good with that motor. I'd love to be able to retro fit that thing onto a ski
7500 rpm is with the completely stock pump and 2000 OEM nujet. It was fighting the rev limiter last trip out, so who knows how high it was trying to go. I'm thinking I'm going to prop it for 7400ish...With the ported cylinders, it should be happier turning a bit higher than the 7200ish those pipes usually run on a stock motor.
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