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Petcock Vacuum

Discussion in 'XJ Technical Chat' started by Jerrod Robinson, Apr 7, 2021.

  1. Jerrod Robinson

    Jerrod Robinson Member

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    I also installed the Coil's that I bought, cause the ones that it came with are aftermarket, and didn't even line up with the Mounts on the frame. So that's where I'm currently at. Hopefully when I plug the new ECU in tomorrow it starts making some noise
     
  2. Jerrod Robinson

    Jerrod Robinson Member

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    Oh, and my current Carb plan is to build the spare set that came with the original Motor I picked up the other day. What I'm working out now is if I wanna try to run the Pod's that they came with or not. I'm assuming they will require a size or 2 increase as well. And I'm wondering if they will be more trouble then their worth..
     
  3. Minimutly

    Minimutly Well-Known Member

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    Please don't, you'll never get it running right. And stop guessing and just buying bits - you need to learn how to fault find, step by step. Did you do any checks on the supply, input and output of the tci before condemning it?
     
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  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    ^^^+ 10,000^^^

    @Jerrod Robinson , slow the heck down. You’re hell bent on changing parts without knowing for sure if they need changing or not.
     
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  5. Jerrod Robinson

    Jerrod Robinson Member

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    It was the Ignition Module, it's fireing again. And unfortunately I don't really have a Choice. This XJ has been called up to Daily Driver. My CB-750 blew a Head Gasket, and fried a Cam Bearing again. But this time the Replacement cam let go on the way home because I'm pretty sure the Head warped this time. So now it's taken the XJ's spot on the back burner.
     
  6. Jerrod Robinson

    Jerrod Robinson Member

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    I decided to fix the XJ over the CB cause the XJ came with a parts Bike. I just wasn't able to bring any of it home cause I was in an Apartment at the time. I have 2 of just about everything for this XJ. Even the original Engine is good, it's just missing 2nd gear.
     
  7. Jerrod Robinson

    Jerrod Robinson Member

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    It's alive!!! Lol, the Ignition Module was the problem the entire time no more power drop off at high RPM. But my Carbs are all outta wack. Didn't even really get to ride it. Guess I'm gonna have to study up on how to tune these things.
     
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  8. Jerrod Robinson

    Jerrod Robinson Member

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    I tightened them all the way, and then backed them each out 3 full turns. It was running, but would sputter when I would give it gas, and when I let off. Not the entire time. But it's definitely not right.
     
  9. Jerrod Robinson

    Jerrod Robinson Member

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    My 2 year old lost his mind lol, he hasn't settled since.
     
  10. Jerrod Robinson

    Jerrod Robinson Member

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    50 mile Maden Voyage complete, it was running better when I pulled back in then when I left.. Appreciate all the help guy's...
     

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  11. Jerrod Robinson

    Jerrod Robinson Member

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    Spent the past Week tinkering
    Ok, so I was able to find a Rebuild kit with 4 #42 Pilot Jet's. And set's of Main Jets Ranging from #125-#145. Decided to leave the Pod's on the shelf to avoid any unnecessary complications. Would you suggest going with the #125's to compensate for my 4 into 1?
     
  12. XJ550H

    XJ550H Well-Known Member Premium Member

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    Carb Series: HSC32
    Carb Model ID: 15T00 (Maxim, Midnight Maxim)
    Carb Model ID: 5H200 (Seca)
    Main FUEL Jet Size: #120
    Pilot FUEL Jet Size: #43
    Main AIR Jet Size: #80
    Pilot AIR Jet Size: #195
    AIR COMPENSATOR Jet Size: #36
    Starter FUEL Jet Size: #40 (non-replaceable, in float bowl)
    Main jet NEEDLE ID: #Y-14

    125 is 5 jets larger

    2 sizws up is where you should start and when you go up 3 sizes up pilot jet by 1
     
  13. Jerrod Robinson

    Jerrod Robinson Member

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    I haven't found a kit that increased by increments of 1 so far, besides the factory Rebuild Kits, #125 has been the base of every kit I've found. Admittedly my Motorcycle part's sourcing skills probably aren't the greatest.
     
  14. XJ550H

    XJ550H Well-Known Member Premium Member

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    www.xj4ever.com

    HCP10607 Aftermarket Hitachi brass #122 MAIN FUEL JET, stock size for 1986 XV1000 models (on the #1 carb only), each:


    HCP10607SET4 Aftermarket Hitachi brass #122 MAIN FUEL JETS, set of 4:
     
    Last edited: May 7, 2021
  15. Polock

    Polock Well-Known Member

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    your muffler has a lot to do with it. if it's a real muffler one size should do but if you can see thru it, maybe two
     
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  16. Jerrod Robinson

    Jerrod Robinson Member

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    Thanks, but I don't have an 86 XV-1000, it's an 82 XJ-750 Maxim with an Aftermarket exhaust.
     
  17. Jerrod Robinson

    Jerrod Robinson Member

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    That's the exhaust, came from eBay. Hasn't been modified in any way. Payed a little more then I would have liked, but it is a great sounding Exhaust. Real quiet at idle, but gets surprisingly loud on the road.
     

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  18. Jerrod Robinson

    Jerrod Robinson Member

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    I put #125's in it and everything got way way better. Been riding it to work for a week now and it's perfect in normal Riding situation's. But its not finished, if I jump from 1st to 3rd and do a pull to 9k it comes on strong from 2k to like 4 1/2k. Then from 4 1/2 to like 6k power will significantly drop off. But once it Clears 6k it pulls like Hell up to 9 thousand and I shift to 4th at 90 mph.
     
  19. Jerrod Robinson

    Jerrod Robinson Member

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    With the factory Jets it would start to sputter and stumble at like 5k, asking for more fuel. And I couldn't get it passed 70mph. The # 125's made a huge difference, it's almost there. I'm just trying to find out if their slightly Lean or slightly Rich now.
     
  20. XJ550H

    XJ550H Well-Known Member Premium Member

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    the note is for the 86 xv but also fits your 750
     
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  21. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The original TCI can probably be repaired. Don't throw it out.
     
  22. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The jet fits your carb, and is the size that you likely need.
     
  23. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Probably rich.
    Do a plug chop.
     
  24. Jerrod Robinson

    Jerrod Robinson Member

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    Oh ok, and it does make since because I looked at the Jets I removed and they were definitely #122's.
     
  25. Jerrod Robinson

    Jerrod Robinson Member

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    So I was able to sort my mid range power issue, turns out I'm just stupid lol. When I lubed my Clutch Cable I threw it back on and called it a night. Then completely forgot to adjust it lol. Everything's cool now..
     
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  26. XJ550H

    XJ550H Well-Known Member Premium Member

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    one of the things that is important when working on bikes is not to get tunnel vision on what may be your problem.
    always a good idea would be recheck any work you did.
    in your case the clutch cable.
    the systems of the bike all interact with the operation of the bike
    good job and thanks for telling us to complete the thread
     
  27. Jerrod Robinson

    Jerrod Robinson Member

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    Thanks for the advice, duely noted.
     
  28. Jerrod Robinson

    Jerrod Robinson Member

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    Ok so I finally got ahold of a Compression Tester, and the Results are in. Cylinder 1 is 115lbs, Cylinder 2 is 120lbs, Cylinder 3 is 135lbs and 4 is 130lbs. From what I've gathered Cylinder 1 is presenting a slight issue because it's not within 10% of the other 3. Would that be an accurate assessment, or have I been mislead?
     
  29. Jerrod Robinson

    Jerrod Robinson Member

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    The Bike runs well enough, and actually really comes alive above around 5500 RPM's. But I have a feeling I'm not getting all she's got for some reason.
     
  30. scoobydew

    scoobydew Member

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    minimum psi is 128. standard is 156 psi i believe. for the 1982 xj750 seca at least. not sure about the maxim. your compression is low so you're not getting full power

    I'm working on a bike with 120 across the board. I haven't ridden the bike yet but it starts up easy. I'm sure when I take her out for a ride ill also have some trouble cranking past 70 mph
     
  31. Franz

    Franz Well-Known Member

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  32. XJ550H

    XJ550H Well-Known Member Premium Member

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    5K RPM is where the power band starts to come alive.
     
  33. Minimutly

    Minimutly Well-Known Member

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    Flawed logic here I'm afraid. Compression has a minimal effect on power, probably zero until the cork in the bottleneck (the carb) is opened fully - and by that I mean throttle wide and slides fully up...
    Sort the fuelling out, but bear in mind your main jet will not be doing much (if anything) to correct it at 5k. Time to look at different needles maybe?
     
  34. Polock

    Polock Well-Known Member

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    just put it together and ride it. if starts right up and runs good, it'll go fast enough.
     
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  35. Jerrod Robinson

    Jerrod Robinson Member

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    I was told anything over 100 PSI is acceptable, but you want them within 10 PSI of eachother.
     
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