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1976 Skidoo RV340

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  • 1976 Skidoo RV340

    Well I think I picked one of the hotter days this year to reorganize the shop. I took the RV off the shelf again so I could spend the rest of the summer and fall finishing it up. I hope to ride and show it this winter. I will post pics and short descriptions of my progress.
    Ray

  • #2
    Finally assembled the engine today. Bored 40 over, new pistons and rings. All new gaskets and seals on entire engine including rotary valve components. Haven't test fired yet. Going to get some Shell V power because it's ethanol free guaranteed. Will post results and final compression numbers on rebuild.
    Ray

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    • #3
      Looking good Ray.

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      • #4
        bring her up this winter ray and see if the ol txl will give her a go across the lake

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        • #5
          I'm not sure where I'm going from here! I'm so angry I'm without words. The machinist messed up on my cylinders. They are at the end of tolerance specs and only building 100 psi. It's not building enough compression to fire. I have clean gloriously strong blue spark on plugs. Checked and rechecked timing on stator and rotary valve three times. Best I got was lazy fart out the exhaust after pulling on the rope for three hours today. Even took the heads off again to confirm arrow pointing to exhaust on pistons and rings lands are good. Not a happy camper today.
          Ray

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          • #6
            Hi Ray. Try switching you spark plug wires from one side to the other.

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            • #7
              I haven't touched the RV since beginning of August. I'm hoping the break will have eased the frustration levels and I can start back into it with a fresh head. I have some ideas I'm going to try but probably not until after Thanksgiving. I will post my results.
              Ray

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              • #8
                So, I have had some similar issues with my '78 RV340...never bored over, but compression seemed low when I got it...new standard pistons were the right call, and new rings seemed to make everything perfect...used new repro gaskets from Goose, and still only have 105-110 per side...it usually runs pretty well, but has a big sag, where it should wind out...I think that might be rotary valve timing...however, when I asked about the compression on oldskidoosleds, several vets said that the 340 never had big compression numbers...even when new...

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                • #9
                  I finally got back to the RV340. Today I fitted the new hood and piano hinge. I'm very happy with the fit. Pictures will be posted soon.
                  Ray

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                  • #10
                    Did you get the motor to fire?

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                    • #11
                      No I have not. I ordered a new Hewtech cdi box for it. I am working up to it. If that doesn't fix it I'm afraid of what I might do in a fit of rage lol.
                      Ray

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                      • #12
                        As promised. Pictures of the new hood fitted to the chassis. next I have to fashion a hood stop and cut the slots for the new windshield tabs.
                        Ray

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                        • #13
                          Today I cut the slots in the hood for the new windshield and installed it. Next is the headlight and gauges.
                          Ray

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                          • #14
                            Looks good Ray.

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                            • #15
                              I put a '94 STX583 ignition into a RV245 that a guy was building. He wanted it to be reliable more than original and didn't have any of the stock ignition components anyways. The stator bolted in, flywheel fit properly, he mounted the coil under the airbox where it cant really be seen and the cdi down under the carbs - once again where it cant be seen. Have had it running but sled isn't finished yet to see how it actually works - just an idea if the 340 cases happen to be similar?

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