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    Best way to check peak RPM

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    • Member since
      November 2006
    • From: IL
    Best way to check peak RPM
    Posted by MorSno on Monday, January 4, 2010 11:10 AM
    It seems my 07 700 Dragon is only running 7900 to 8000 peak RPM while riding this past week. I know it should be closer to 8100 to 8200. I'm going to replace the primary spring and install a new belt. I've cleaned all the clutches and did the normal pre-season up keep. We were riding in healthly snow and not sure if that would affect the performance to a certain degree, I was down ~5 to 10mph on top end. Is there anything else I should consider? Is there a good way to check peak RPM in the garage?
    • Member since
      July 2005
    Posted by jasper on Monday, January 4, 2010 4:07 PM
    The only way your accurately going to check your sleds rpm is under load with good traction. Clutch performance can vary greatly from riding in loose snow to hard pack which effects rpm. You'll need a good 1/4 mile run at wot on hard pack or ice provided the track is studded to get a good idea on peak rpm when making clutch changes when using the stock gearing.
    • Member since
      November 2006
    • From: IL
    Posted by MorSno on Monday, January 4, 2010 4:29 PM
    Jasper, thanks for the feedback... Luckly we have good snow pack in norhtern IL that should be ideal for testing.
    Moderator
    • Member since
      October 2005
    Posted by Oneshot on Tuesday, January 5, 2010 10:29 AM

    Not unless you have a Dyno where you can apply a Load on the Engine to simulate real life in the Field conditions. I'm afraid your best bet is to just find an nice straight flat Road or trail etc. and just let her go. If your Clutching is right, your Rpms. should go right to your Peak/full Shift out and stay there until your Secondary more or less catches up with your engine revs and maxes out your Track Speed.

    Note, this won't work if you are in any significant amount of Snow or Ice and the track is spinning like crazy off the line as your revs will come up and then fall off and then slowly build back up to full shift again when the track stops spinning and your Clutches equal everything out to Overdrive.

    If your Primary Clutch Spring or Drive Belt are old and worn out, this will certainly not allow your Sled to reach peak revs. Just like any other Vehicle, everything needs to be right and not worn out or it's not going to do what it should or has done in the Past!

    You said you were in "Healthy" Snow. Anything over an inch or two is most definitely going to drop your Speed but your Clutches should still maintain full shift if you still have her pinned because your secondary has downshifted on the Helix to allow your Engine to stay in its Powerband and let you Rock and Roll out of that Snow if you should wish to do so. It's best if you are on Hardpack if you want to achieve Maximum Speed!

    Good Luck and I hope this helps,

    Rob.Cool

    • Member since
      November 2006
    • From: IL
    Posted by MorSno on Tuesday, January 5, 2010 12:26 PM
    Rob, thanks for the feedback... very helpful. I checked the belt last night and it appears to be loose probably explaining a slight rpm drop. I'll be picking up a new belt tonight and adjusting the secondard appropriately.

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