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Search results

  1. M

    79 GS850 still idling rough

    Fuel screws were set at 1 when I started. I moved them in to 3/4 yesterday and noted an improvement in throttle response.
  2. M

    79 GS850 still idling rough

    I've already removed a broken tip which resulted in a slightly enlarged fuel screw, and I know that this will cause some different settings on that particular carb. Also just to clarify, I am adjusting the pilot air screw to achieve highest idle? And I'm turning in to make the mix richer? As...
  3. M

    79 GS850 still idling rough

    I have checked compression and it’s even across the board. Checked leak down as well and was in spec. Spoke to someone a bit more knowledgeable than me about my issue and we went through the pilot circuit diagram. Turns out I’ve been adjusting the wrong screw for the past year… The 79 gs850...
  4. M

    VM Pilot Air Screw Insensitivity

    Hi LeonAlistar, I am having the same experience as you with my 79 gs850 (same carbs, essentially same engine). The bike will idle okay but not smoothly. They’re vacuum synced within spec. The adjustments I make to the idle air screws have little effect on the idle of the bike. The bike vibrates...
  5. M

    79 GS850 still idling rough

    As an introduction, I’ve been working at this bike for a while. I’ve replaced intake and carb boots, set ignition timing, replaced condensers, set valves, replaced the air filter, sealed the airbox, hot dipped the carbs and replaced O-rings, rebuilt choke plungers, replaced coils, plugs and...
  6. M

    1979 GS850 Ignition Trouble

    The original 2-3 ignition coil showed the same behaviour. I can't imagine that I've had two bad ignition coils on 2-3, which leads me to believe that the issue is somewhere upstream.
  7. M

    1979 GS850 Ignition Trouble

    Little update on the bike... I replaced the condensers and I'm not sure how much of a difference it made, it still feels like it's running a bit rough. I disconnected the leads from the points that run up to the coils, checked for shorts and everything checked out good. 1-4 seem to be running...
  8. M

    1979 GS850 Ignition Trouble

    Caps are already done and definitely improved running condition a few weeks back. I'm not sure what caused it to start running so poorly, as two weeks ago I got it running well, then parked it until Saturday to mount tires. The Saturday ride went great and yesterday it started giving issues...
  9. M

    1979 GS850 Ignition Trouble

    I played with the wire coming off of the point and the timing issue is resolved. The bike still runs quite poorly around idle and definitely vibrates a bit more than feels normal under load. I’m thinking it may be time to upgrade to a Dyna ignition system to not have to mess around with points...
  10. M

    1979 GS850 Ignition Trouble

    I took my freshly redone gs850 for the first ride yesterday, and it ran terrific! The power was good, idled good and sounded normal. Today, I go to take the bike out for a ride and it won’t start easily and has a rough idle. I check timing, good on 1-4, firing intermittently on 2-3. Replace both...
  11. M

    1979 GS850 Ignition Coil Help

    Lower screws are set to 1 turn out on my vm26s on my 850. I sprayed carb cleaner around the boots and airbox and heard no difference in idle.
  12. M

    1979 GS850 Ignition Coil Help

    Problem didn't move at all. But cylinder 3 appears to be firing now! Now my issue is a stumbling idle at at 1100rpm and the air idle screw adjustment have negligible effect on the idle. The tuning guide instructs to turn the screw out until the idle stops rising but the idle does not rise...
  13. M

    1979 GS850 Ignition Coil Help

    I just replied to another 850 owner with a similar issue instructing them to swap the coils... can't believe I didn't think of doing it to my own bike! I have a set of coils on the way just in case but I appreciate the offer. I also really need to figure out how to do the timing on this thing as...
  14. M

    Please help dropping centre cylinders 850

    I'm currently also trying to get my 850 to run properly and I can only provide you with knowledge I've read from other posters, not my own experience. Since your centre cylinders (2-3) are dropping, it sounds like it is an electrical issue as the cylinders fire in pairs (1-4 and 2-3). It's...
  15. M

    1979 GS850 Ignition Coil Help

    Hi All, Fired my bike up yesterday after a summer of working on it. I've rebuilt the carbs, installed new airbox and intake boots/o-rings, checked for leaks while its running, re-shimmed the valves, all the usual GS rebuilding steps. It was put away in the first place because cylinder 3 was not...
  16. M

    1979 GS850 Oil Pan Gasket DIY

    Took everyone’s advice and made a gasket trying to replicate the holes the best I could. The bike fired right up! Time to tackle the new problem of cylinder number 3 not firing and a high idle >:( . Pleased to reach this milestone though! Thanks again everyone.
  17. M

    1979 GS850 Oil Pan Gasket DIY

    Hi everyone, I am nearing starting my bike for the first time in over 20 years! There's one missing piece of the puzzle though, the oil pan gasket. I have been waiting on this part for nearly a month from japanesedreambikes on ebay. They have positive reviews from members on this site so my...
  18. M

    Wont idle?

    There are carb rebuilding guides on BikeCliffs website. I found them incredibly helpful for reassembly and cleaning.
  19. M

    Long term engine unit storage query

    My bike had been in storage since the late 90s and I've been going through doing valves etc. I haven't noticed any rust on any cams or anything under the valve cover. I feel like flash rust is not a huge concern for the top end at least.
  20. M

    Vendors for

    I purchased a set of HEL brake lines. Haven’t fitted them yet but they appear to be super high quality.
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