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  1. Tristan Kernick
    Post

    Tips for Troubleshooting Flaky Connections

    I would be very surprised if it’s the TCI. It doesn’t just run better with the stock coils, it runs flawlessly. I just did another color tune and...
    Post by: Tristan Kernick, Yesterday at 7:57 PM in forum: XJ Technical Chat
  2. Tristan Kernick
    Post

    Tips for Troubleshooting Flaky Connections

    Nope, switched it out for the modern blade fuse version. The bike also runs fine on stock coils, so I think the fault must be somewhere between...
    Post by: Tristan Kernick, Yesterday at 6:16 PM in forum: XJ Technical Chat
  3. Tristan Kernick
    Thread

    Tips for Troubleshooting Flaky Connections

    Hoping for some tips and tricks that have helped people troubleshoot flaky electrical connections. I’ve been having issues with my dyna coil kit....
    Thread by: Tristan Kernick, Yesterday at 5:07 PM, 6 replies, in forum: XJ Technical Chat
  4. Tristan Kernick
    Post

    What did you do to your Yamaha today?

    I’m glad to have some confirmation on this, since this was my hypothesis as well. The old headlamp has “For Motorcycles” printed on it, so I...
    Post by: Tristan Kernick, Yesterday at 7:07 AM in forum: XJ Technical Chat
  5. Tristan Kernick
    Post

    What did you do to your Yamaha today?

    I went on my first night ride in a while today. I try to avoid riding it night, as the deer are omnipresent after dark in Pennsylvania. Though at...
    Post by: Tristan Kernick, Thursday at 8:58 PM in forum: XJ Technical Chat
  6. Tristan Kernick
    Post

    What did you do to your Yamaha today?

    Sometimes when walking up to my bike in a parking lot, I think to myself: “Damn, what a handsome machine.” [ATTACH]
    Post by: Tristan Kernick, Jul 24, 2025 in forum: XJ Technical Chat
  7. Tristan Kernick
    Post

    XJ650 dropped into neutral from 2nd

    This happens to me from time to time, and I think missing shifts from first to second is normal on bikes where neutral is between 1 and 2. From...
    Post by: Tristan Kernick, Jul 18, 2025 in forum: XJ Technical Chat
  8. Tristan Kernick
    Post

    XJ650 dropped into neutral from 2nd

    Ah, so this can just happen with this gearbox. During the next off season, I’ve been considering trying the performance shifter pawl modification....
    Post by: Tristan Kernick, Jul 18, 2025 in forum: XJ Technical Chat
  9. Tristan Kernick
    Thread

    XJ650 dropped into neutral from 2nd

    Strange thing happened while I was out for a ride today. I was coming to a stop and downshifting through the gears — I like to continuously...
    Thread by: Tristan Kernick, Jul 11, 2025, 7 replies, in forum: XJ Technical Chat
  10. Tristan Kernick
    Post

    What did you do to your Yamaha today?

    It was a very lucky find. Bought it with 3900 miles on it in July of last year, so I guess I’ve officially crossed 3000 miles in the saddle over...
    Post by: Tristan Kernick, Jul 6, 2025 in forum: XJ Technical Chat
  11. Tristan Kernick
    Post

    What did you do to your Yamaha today?

    I took my XJ650 on a ride up to Grandview Ave today, just since we are liable to have rainy weather for the next week or so here in Pittsburgh....
    Post by: Tristan Kernick, Jul 6, 2025 in forum: XJ Technical Chat
  12. Tristan Kernick
    Thread

    81 XJ650 - Misfiring with Dyna Coils

    A few weeks ago, I posted about a misfire problem that stubbornly refused to go away until I undid my Dyna coil mod. Putting the OEM coils back on...
    Thread by: Tristan Kernick, Jun 29, 2025, 0 replies, in forum: XJ Technical Chat
  13. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Posting again because it seems I’ve solved this issue. I did a combination of things: 1) Removed all idle screws, blasted carb cleaner directly...
    Post by: Tristan Kernick, Jun 21, 2025 in forum: XJ Technical Chat
  14. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Hang on, I’m an idiot, and I read the circuit diagram wrong. Red/white is +12V power, orange is one of the ones that sends a signal to the...
    Post by: Tristan Kernick, Jun 15, 2025 in forum: XJ Technical Chat
  15. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    I tried with the resistive plugs. No change. Also tried with non-resistive on 1 &4 and resistive on 2 & 3 (it’s what the Haynes manual suggests...
    Post by: Tristan Kernick, Jun 15, 2025 in forum: XJ Technical Chat
  16. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    I have not. I don’t have any of the correct plugs lying around, though I do have four of the resistive version. I think it would still run with...
    Post by: Tristan Kernick, Jun 14, 2025 in forum: XJ Technical Chat
  17. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Alright, I’ve done these tests. This time, I measured the voltage on the R/W wires at the ignition coils. Even with the bike off, I measured 12.3...
    Post by: Tristan Kernick, Jun 14, 2025 in forum: XJ Technical Chat
  18. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    First, no I have not sprayed contact cleaner into any switches. I could try that later I guess, see if cleaning out the engine cutoff or starter...
    Post by: Tristan Kernick, Jun 13, 2025 in forum: XJ Technical Chat
  19. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    I took the bowls off, then removed the needle valve seats and pilot jets to check for blockages. There was a tiny bit of debris in the filters on...
    Post by: Tristan Kernick, Jun 13, 2025 in forum: XJ Technical Chat
  20. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Finally had the time to do this troubleshooting. Hooked up my multimeter to the coils, cranked the engine. It wouldn’t read anything on DC mode,...
    Post by: Tristan Kernick, Jun 12, 2025 in forum: XJ Technical Chat
  21. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Yes, the 81 has a mechanical tach. It still gets bouncy, but that’s because of misfiring and uneven running lol. On the bright side, I already...
    Post by: Tristan Kernick, Jun 10, 2025 in forum: XJ Technical Chat
  22. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Hmm, I didn’t know that could happen from lack of an inline filter. I thought there was a risk of clogging the screens on the needle seats, but I...
    Post by: Tristan Kernick, Jun 10, 2025 in forum: XJ Technical Chat
  23. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Indeed I did do this. Voltage dropped from around 13.3 to 11 while the starter was cranking (I didn’t write down the number, this is my best...
    Post by: Tristan Kernick, Jun 9, 2025 in forum: XJ Technical Chat
  24. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    That sounds like my exact issue. Unfortunate that his solution was to replace the coils, since I’ve already done that… I guess I will reconnect my...
    Post by: Tristan Kernick, Jun 9, 2025 in forum: XJ Technical Chat
  25. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Well, I’ve now disconnected, cleaned, and reconnected every connector on the bike. Nothing has changed. It’s still super slow to take off: the...
    Post by: Tristan Kernick, Jun 9, 2025 in forum: XJ Technical Chat
  26. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Alright so I’ve tested the charging circuit. 14.6 V at the battery when at 2k RPM, and the voltage is rock solid. Time to check more connectors.
    Post by: Tristan Kernick, Jun 9, 2025 in forum: XJ Technical Chat
  27. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    Alright, so I have a bit of an update. Sprayed carb cleaner at the intake boots while running, no change whatsoever. Looks like I don’t have a...
    Post by: Tristan Kernick, Jun 8, 2025 in forum: XJ Technical Chat
  28. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    I actually don’t have an inline fuel filter, which means it’s possible some junk got into one or more of the mini filters inside the carbs. But I...
    Post by: Tristan Kernick, Jun 8, 2025 in forum: XJ Technical Chat
  29. Tristan Kernick
    Post

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    When I replaced the coils, I replaced the plug wires and caps too, so I know there isn’t water trapped in there. Though, I could still benefit...
    Post by: Tristan Kernick, Jun 8, 2025 in forum: XJ Technical Chat
  30. Tristan Kernick
    Thread

    81 XJ650 Misfiring After Heavy Rain - Coils Replaced

    I got caught in a severe downpour two days ago, and the bike began to misfire at idle. Was able to limp home by keeping my revs up, and I expected...
    Thread by: Tristan Kernick, Jun 8, 2025, 44 replies, in forum: XJ Technical Chat
  31. Tristan Kernick
    Post

    CNYCC#18 - now scheduled for June 7, 2025

    It would run okay when at high RPM, but choke and sputter at low RPM and idle. I was able to limp home by keeping the revs high, constantly...
    Post by: Tristan Kernick, Jun 6, 2025 in forum: Hangout Lounge
  32. Tristan Kernick
    Post

    CNYCC#18 - now scheduled for June 7, 2025

    I just tried to leave early and get ahead of the worst of it, but my bike broke down just 15 miles from home. Have rode through rain just fine...
    Post by: Tristan Kernick, Jun 6, 2025 in forum: Hangout Lounge
  33. Tristan Kernick
    Post

    CNYCC#18 - now scheduled for June 7, 2025

    Uh-oh [ATTACH]
    Post by: Tristan Kernick, Jun 5, 2025 in forum: Hangout Lounge
  34. Tristan Kernick
    Post

    Long distance touring on an XJ

    I think I figured it out. Filled the tank today, after riding about 85 miles on the last leg of my journey yesterday. I easily got 45 mpg across...
    Post by: Tristan Kernick, Jun 1, 2025 in forum: Hangout Lounge
  35. Tristan Kernick
    Post

    Long distance touring on an XJ

    Interesting. Any idea if the 750 is geared taller? In top gear, 75 mpg corresponds to 6000 RPM. I wasn’t surprised that my mileage got worse when...
    Post by: Tristan Kernick, May 31, 2025 in forum: Hangout Lounge
  36. Tristan Kernick
    Post

    Long distance touring on an XJ

    Well, I tried a trip from Pittsburgh to Akron and back (about 4 hours of road time round trip). It was mostly on the interstate, which isn’t what...
    Post by: Tristan Kernick, May 31, 2025 in forum: Hangout Lounge
  37. Tristan Kernick
    Post

    81 XJ650 - Dimly Lit Oil Light

    I have an update to this thread. Yesterday, after washing the bike, I noticed my neutral light was dimly on, but only when the engine cut-off was...
    Post by: Tristan Kernick, May 27, 2025 in forum: XJ Technical Chat
  38. Tristan Kernick
    Post

    Long distance touring on an XJ

    Interesting, I had been on the fence about getting one of those, but I think I’ll give it a try. The grip is the most worrisome part for me,...
    Post by: Tristan Kernick, May 19, 2025 in forum: Hangout Lounge
  39. Tristan Kernick
    Thread

    Long distance touring on an XJ

    I’m looking at around 6 hours of riding for the CNYCC in a few weeks, and I feel woefully unprepared. I’ve only been riding street bikes for about...
    Thread by: Tristan Kernick, May 19, 2025, 16 replies, in forum: Hangout Lounge
  40. Tristan Kernick
    Post

    No idle screw adjustment left.

    I’ve had this happen before. When you vacuum synch the bike, you are essentially unbalancing the butterfly valves to even out the vacuum in each...
    Post by: Tristan Kernick, Apr 30, 2025 in forum: XJ Technical Chat
  41. Tristan Kernick
    Post

    Collected another one

    Incredible. My bike was in similar condition when it came to me last year, though with a little more degradation on the clear coat on all the...
    Post by: Tristan Kernick, Apr 29, 2025 in forum: XJ Technical Chat
  42. Tristan Kernick
    Post

    XJ front end modernisation.

    Somebody posted here once about replacing the entire XJ650 front end with an R6 front end:...
    Post by: Tristan Kernick, Apr 24, 2025 in forum: XJ Modifications
  43. Tristan Kernick
    Post

    81 XJ650 - Dimly Lit Oil Light

    Thank you for the suggestion. It still goes full brightness when the starter is cranking the motor, which I believe it should. I think I’ll...
    Post by: Tristan Kernick, Apr 21, 2025 in forum: XJ Technical Chat
  44. Tristan Kernick
    Post

    XJ900f suddenly idling issue.

    I know this is a completely different suggestion than anyone else had, but I once dealt with a rough idle on my 650 Maxim. It was similar to your...
    Post by: Tristan Kernick, Apr 20, 2025 in forum: XJ Technical Chat
  45. Tristan Kernick
    Post

    81 XJ650 - Dimly Lit Oil Light

    Symptom update, I guess. The light is fully off when the key is turned to On, but the engine cutoff switch is off. When the engine cutoff switch...
    Post by: Tristan Kernick, Apr 19, 2025 in forum: XJ Technical Chat
  46. Tristan Kernick
    Thread

    81 XJ650 - Dimly Lit Oil Light

    Noticed something when pulling into my garage today. My oil light was dimly lit, so dim that I didn’t even notice while riding around in the...
    Thread by: Tristan Kernick, Apr 18, 2025, 6 replies, in forum: XJ Technical Chat
  47. Tristan Kernick
    Post

    82 Yamaha 650 Maxim fires after petcock set to prime

    It sounds like your petcock isn’t letting fuel through when it’s set to ON. When you set it to PRI, the petcock functions just like a non-vacuum...
    Post by: Tristan Kernick, Apr 13, 2025 in forum: XJ Technical Chat
  48. Tristan Kernick
    Post

    81 XJ650 - Headlight woes

    Makes sense, heat was my concern with the headlight bucket strategy. I’ve come up with an alternative. I basically followed the stock wire bundles...
    Post by: Tristan Kernick, Apr 6, 2025 in forum: XJ Technical Chat
  49. Tristan Kernick
    Post

    81 XJ650 - Headlight woes

    I have an update. I ordered a headlight relay kit from chacal. The install was fairly simple, though it seems that mounting the new relays with...
    Post by: Tristan Kernick, Apr 4, 2025 in forum: XJ Technical Chat
  50. Tristan Kernick
    Post

    What did you do to your Yamaha today?

    Went for a longer ride across town today. When I got to my destination, I noticed I was missing something… [ATTACH] [ATTACH] I’m assuming this...
    Post by: Tristan Kernick, Mar 29, 2025 in forum: XJ Technical Chat
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