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83 XJ750 Maxim hasn't been started in 7 years

Discussion in 'XJ Technical Chat' started by jag3, Jun 20, 2020.

  1. jag3

    jag3 Member

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    I'm the original owner of an 83 XJ750 Maxim and I haven't ridden or started it in seven years. I am working on rebuilding the carburetors and once they are reinstalled before starting it what should I do? I am hoping the engine isn't seized since the oil is just as old and nothing inside has been turned over. I will change the oil and fill but what else? I tried to push it across the garage but it was very difficult, wheels may be locked or partially frozen. I guess this is going to turn into a project bike. Thank you for any advice you can give. - Joe
     
  2. Timbox

    Timbox Well-Known Member

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    GM and glad to hear you are trying to get the old girl running again. Yes after that long I would guess that all the fluids will need to be flushed and changed. I would guess that the brakes are locked up and that the master cylinders for each will need to be taken care of. Removed, go through them and flush and replace fluid.

    As for the engine, once you change the oil you can take the left engine cover off and turn the engine counter clock wise to get some fresh oil through the engine before you try to start.

    Those carbs will need to go to "Church". Please take the time to go them right the first time. That means taking them down all the way and replacing the throttle shaft seals as well as cleaning the small jet in the bottom of the fuel bowl.

    https://www.xjbikes.com/forums/threads/in-the-church-of-clean.14692/

    Check the gas tank with a good light, if you have rust in there, you will have to take care of that as well. The connectors throughout the wiring harness might need some TLC to get the corrosion off as well. Take your time and look things over. If you have not changed over the old glass fuse system on the bike, it would be a good time to do that.

    Good luck and keeps us up to date with your progress. Pics of each project you are working would be great.
     
  3. jag3

    jag3 Member

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    Thank you for the information. It's been garaged and I drained the tank several years ago and lightly sprayed wd40 into the tank to hopefully prevent rust. Not sure how good the pictures are but here's a start. 20200621_155753.jpg 20200621_155817.jpg 20200621_155914.jpg 20190703_142144.jpg 20190703_130819.jpg 20200621_155753.jpg
     
  4. jag3

    jag3 Member

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    Can I add an engine cleaner once i get the old oil drained when I refill it with fresh oil? If not I'll just run it for a hundred miles or so and the drain the oil again anyway, I want to make sure all the old crud is out. I know the oil is a ways away but just figuring out what I can and need to do. Once this is running and drain the 100 mile oil out can I use synthetic oil? The bike has 25,000+ on it.
     
  5. Huntchuks

    Huntchuks Well-Known Member

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    Try a little Sea Foam in the oil, follow the instructions. Don't overdo the miles before changing the oil. Personal choice between synthetic and non.
     
  6. Timbox

    Timbox Well-Known Member

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    Thanks for the pics, looks like you have a nice bike there to restore.
     
  7. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    I would not go to full synthetic but that’s me. I prefer the Yamalube 10w-40. I use that in all my bikes.

    if you get into trouble with your carbs.... I’m right here, or you have my cell # too

    dfox
     
  8. jag3

    jag3 Member

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    Can I replace my 120 jets with 122 jets and my 40s with 43? Regarding the tiny hole that's in the bowl that looks like it connects to the bigger hole, do they? Does this passage connect? Where do the o'rings, springs and two needle valves go? Any idea on how to remove the screws on the covers and are they the bowl drain screws? 20200622_223913.jpg 20200622_223952.jpg 20200622_224322.jpg 20200622_224422.jpg 20200622_224527.jpg 20200622_224545.jpg 20200622_225640.jpg 20200622_225658.jpg
     
  9. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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  10. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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