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Thread: 1050 from hell

  1. #1
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    1050 from hell

    so seeing as how a 1200 full circle crank would be tough to procur,i thought a 1050 would be a much easier way to go.so what cylinder was the best stock or ported for a single pipe setup for 92 octane?would ported cases be a waste for something limited to 7100 rpm tops?how far could the bore be taken?i'm thinking 42mm carbs but could stay 40mm.about what hp could be pulled from this setup?


  2. #2
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    Whats wrong with just running a 1200? Is the full circle crank really that big of a deal?

  3. #3
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    vibration and it stuffs the cases better.allthough it is more rotating mass and slower to rev.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Hot Seat likes to use the 009.

    I think Art was up to something with the other 1050 cyls though.

  5. #5
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    pretty sure randy liked the 009's a well.so what will stock 009's turn rpm wise??

  6. #6
    When I had my old slxh 1050 it had Hotseat ported 009 cylinders and their 92 octane heads. Pretty much was equivalent speed wise to a slx 1200 with Hotseat heads. I'm pretty sure it used to run in the high 6600 rpm range with a 7.0 nujet. The full circle crank I am running in my pro does have one negative when compared to the pork chop crank. The bad harmonics in the full circle crank are between 1800 -2500 rpm while the pork chop crank has its bad harmonics from around the low 2000 rpms to around 3500 rpm. When going through no wake zones it is a pain to be able to only run 1800 rpms. Other than that I have been happy with its performance. From idle to 1800 rpm it is smoother than my stock virage 1200. It will hold a steady rpm anywhere in the 2500 - 5200 range and accelerate cleanly from that range. In the 2500 -3500 rpm range it still runs a little rough when not on plane, but definately better than the pork chop crank. What is the rod length and crank pin diameter on a 1050 crank?

  7. #7
    Connecticut CrazyA's Avatar
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    Quote Originally Posted by laskt View Post
    What is the rod length and crank pin diameter on a 1050 crank?
    The rod is 136mm center to center with a 28mm crank pin diameter and a 20mm wrist pin diameter. The 1200's are 136mm too, but have a 27mm crank pin diameter and a 22mm wrist pin diameter. Also, the 1050 rod is 16mm wide whereas the 1200 is 18mm wide.
    Last edited by CrazyA; 11-11-2012 at 08:36 AM.

  8. #8
    Polaris must not have wanted to bore any farther out on the crank wheel so they went with a smaller pin to get from a 68mm to 70mm stroke. Considering polaris had some issues with this smaller pin in their older 800cc sleds I wonder what size crank pin they are using in their late model 800cc sleds.

  9. #9
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    my 1200 crank seems to vibrate from 1800 to about 3000 after that shes pretty smooth.the 700 crank doesn't seem to have any vibration issues.maybe the 180 vs the 120 degrees of seperation would increase vibration of say the 700 vs 1050 crank?its been a long time since i rode a 1050 to compare a 1050 vs 1200 for vibration

  10. #10
    Connecticut CrazyA's Avatar
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    Quote Originally Posted by laskt View Post
    Polaris must not have wanted to bore any farther out on the crank wheel so they went with a smaller pin to get from a 68mm to 70mm stroke. Considering polaris had some issues with this smaller pin in their older 800cc sleds I wonder what size crank pin they are using in their late model 800cc sleds.
    The smaller crank pin on the 1200 doesn't change the stroke. Both rods are 136mm.

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