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  1. #1

    SL750 Break in on a rebuild

    Hey everyone I havent been on in a while, but I picked up a 95 sl750 last fall and had it rebuilt with new sbt pistons and cylinders and was wondering on how to break it in. I believe the mechanic td me no more than half throttle the first tank of gas? Also what fuel to oil ratio should I use? Rather have too much oil than not enough.


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome back

    Break-in procedure has been covered in a bunch of threads, including one very recently.

    I am sure a quick Search will find the info you need.

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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  4. #4
    From SBT... I used these procedures and they worked extremely well. cheers

    These instructions apply to all models with the exception of the RFI, DI and 4-stroke equipped models. For the DI models, do not add oil to your fuel tank. For the new 4-stroke skis, we recommend you consult your Owner's Manual and follow the recommended procedures.

    NONE of the engine break-in can be done out of the water!

    Proper break-in of your engine is the most critical aspect for determining the longevity and performance of your engine. Engines not properly broken-in will often fail within the first minutes of operation. Ring failure and piston seizure are the most common symptoms of an improper break-in procedure.

    If you have a pre-mix system (mixing oil and fuel in the fuel tank), then you should richen the ratio to about 32:1 for the first ten gallons of gas. If you have an injection system (putting oil in a separate oil tank), then you should put 50:1 premix in the fuel tank along with the oil injection system for the first ten gallons of gas.

    During the first 10 gallons of gasoline, there should be NO full throttle operation. First idle the engine for about 10 minutes to ensure that the engine is properly warmed-up. Then begin varying the throttle position up and down, up to 20% throttle for a half hour. Then come back and let the engine cool off completely - it should be a good 30 min break. After it cools down, you may now ride it up to 50% throttle for another half hour or so. Then come back again and let it completely cool down again. Now you can go out and ride up to 90% throttle. Continue this for the remainder of the 10 gallons, never holding one throttle position for more than a few seconds. Do not run at a steady throttle position and do not go to 100% throttle. After your first tank of gas, replace your plugs with fresh ones. For the second tank, you may ride normally with one exception - do not hold it at 100% throttle for more than a few seconds. After the second tank of gas, you are completely broken in and may ride anyway you like.

    Last edited by Ericka-SBT; 07-15-2008 at 09:25 AM.

  5. #5
    Thanks dorf! Thats exactly was I was looking for. I appreciate it.

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    You're free to use any break in procedure you decide. But from what I've heard, you only have a small window to really break the rings in before the "high spots" of the cross hatching is worn down by the rings.

    If you think about it, do you actually believe the racers take that long to seat every new set of rings??? No..... And they need the absolute best compression you can get.

  7. #7
    Thanks xlint. I have one other question if anyone can help. I rfeplaced all 3 pistons but the rear was the bad one. My question is if any of you would have a suggestion as to why that one burned up. I've seen online that a common cause would be from the crank not being in index? The guy said he thought it was the carbs were just dirty. I just don't wanna sink anymore money in it and it burn up again.

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Have you done the fuel system upgrades?

    Have you done a crank index test?

    Have you done a leak down test?


    Only replacing the pistons and not fixing the actual problem will only result in another failure.

    Check out the everything you need to know about 650/750/780 thread

  9. #9
    The fuel pump has been upgraded to the triple, but I have not done either of the 2 tests. Would it still crank and start if it was out of index?

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Yes it would.

    Fuel pump is only 1 part of the fuel system. Fuel lines, filters, petcock, and internal carb parts are all just as old.

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