Acoustic neuroma symptoms

Ah, those fuel impurities are so cunning! I'm presently stumped. First, I don't understand why new fuel filters still sealed in their packages on the workbench were so defective that they failed to stop impurities getting into the pilot circuit.What are the symptoms of acoustic neuroma and second, why there was no sign of those impurities when I inspected the carburetor this morning.

Rather than try to clean the pilot circuit on the bike I removed the carburetor so I could see and understand the problem.What are the symptoms of acoustic neuroma with the air screw removed I used a fiber optic bundle to send a million foot-candles (estimated) of light into the little chamber under the two pilot inlets while under a stereomicroscope to see if I one or both of them was blocked.What are the symptoms of acoustic neuroma neither was blocked, nor could I see any sign of machining swarf through the air screw hole (although I'd have to remove the welch plug to be 100% sure of that).What are the symptoms of acoustic neuroma even though I could see neither hole was obstructed I still dropped the non-sharp ends of #65 and #71 drill bits through the two holes.What are the symptoms of acoustic neuroma I didn't remove the bowl this time because yesterday I had done so and the pilot jet wasn't blocked.

Before putting the carburetor back on the bike I inspected the needle to be 100.0% sure I hadn't installed the wrong one at some point in the last day or two, but it is the correct 2-ring 4-stroke needle.What are the symptoms of acoustic neuroma the docz could get it intermittently started but it ran very rough and quickly died. I did succeed in coaxing the rpm up once and as long as I kept it above ~3k rpm it ran great, but when the rpm dropped below that it started missing badly and quickly died.What are the symptoms of acoustic neuroma the only thing I had done to the carburetor between the bike running rich but OK-ish and it running horribly was to cut the slide so it's now a #3.33, but that doesn't explain the symptoms.What are the symptoms of acoustic neuroma

OK, stepping back for a moment, 90% of carburetor problems are electrical. I realized that the rpm pickup clamp is clamped around the HT lead at the magneto so I removed the clamp, thinking perhaps the spark was shorting through it.What are the symptoms of acoustic neuroma no luck. The bike behaved the same, barely starting but running well if I could get it over 3k rpm. Although I rebuilt the magneto myself, all possibilities are open for consideration at this point.What are the symptoms of acoustic neuroma I've gone through most of a box of spark plugs over the past week so the issue isn't that I'm using an old plug. The easiest checks will be to see if the pickup brush is OK, the HT lead has the correct ~0 ohms from end to end, or the timing has slipped (although retarded timing wouldn't explain the missing at low rpm).What are the symptoms of acoustic neuroma

I first carefully inspected the 1038 and found one of the pilot inlets partially blocked. I checked all the other passages and inlets, using a can of compressed air to make sure all were free.What are the symptoms of acoustic neuroma with that taken care of I assembled it to the same specs as the 1036 but using different components so that only the slide and needle would be common between the two.What are the symptoms of acoustic neuroma

After the 1036 was off the bike and the 1038 was on I found that no fuel would come out of the tickler. Making a long story short, I worked backwards to the point where I tried to flow fuel into the free standing bowl without even the needle or float present.What are the symptoms of acoustic neuroma only when I lowered the bowl to pick up my iphone did a dribble flow into it. And, yes, there is fuel in the tank, and it flows quite freely through the new filter I installed.What are the symptoms of acoustic neuroma however, since the filter was something different than before, I replaced it with a length of tubing. Still no flow into the bowl.What are the symptoms of acoustic neuroma although I said in a previous post that "all possibilities are on the table," that doesn't include violating the laws of physics.What are the symptoms of acoustic neuroma

I then blew 120 psi shop air through the inlet connector to the float bowl, after which fuel flowed freely. When assembling the carburetor I had inspected the bowl to be sure nothing was blocking the seat, and the banjo bolt to be sure it was completely free, and used canned air to flow through the banjo itself, but clearly something had been inside the banjo that let low pressure air pass but blocked fuel.What are the symptoms of acoustic neuroma

The 1036 has two advantages. It's essentially new, and the transition to the head doesn't have a small step up. However, although used, the 1038 also has two advantages.What are the symptoms of acoustic neuroma it's a right-hand carburetor so tickling is easier than with the left-hand 1036 (as is access to the pilot and idle screws), and having the tickler on the right also makes it easier to put the carburetor on and take off the bike.What are the symptoms of acoustic neuroma the studs are long enough that the nut on the tickler side can't be removed (or installed) unless the carburetor is pulled ~1/4" away from the head.What are the symptoms of acoustic neuroma even then the tickler is still somewhat in the way making installing or removing the inside nut and washers without dropping them a bit fiddly.What are the symptoms of acoustic neuroma

If maintaining the 'set' float height is a primary concern, why not swap the bowls between the 36 and 38mm concentrics?Swapping the entire carburetor follows the general principle of making one change at a time.What are the symptoms of acoustic neuroma by switching the entire carburetor (minus slide and needle), if the bike had run better (which it didn't) it would have pointed at there being something wrong with the 1036, which includes its float bowl.What are the symptoms of acoustic neuroma however, had I switched bowl and it not run better, I wouldn't have known whether the cause was the float bowl or the electrics.What are the symptoms of acoustic neuroma

Last night I tried to make an estimate of the timing by the stick down the spark plug hole method, but with the kick starter on one side and the points on the other, even with a mirror I couldn't get it close enough so after two tries I gave up on doing this quick and easy.What are the symptoms of acoustic neuroma I'll jack the rear wheel off the lift today so I can use it to advance the engine incrementally. As I wrote previously, I'll check the things I can check in situ (timing, points gap, spark plug wire and cap, and HT pickup).What are the symptoms of acoustic neuroma should I not find anything, the magneto will come off so I can spin it on my three dynamic testers.

Why not put a degree wheel on the goldie's crank, ...I added a removable cross-bar to the docz so I could leave a bike in place between tests (which I had to modify considerably to clear the 'speedway' roller), so that certainly would be possible.What are the symptoms of acoustic neuroma however, I'd have to remove the primary cover and devise a way to rigidly mount a timing disk to the crank. Neither is beyond the scope of doing, but at that point it would be nearly as easy to pull the magneto and test it directly.What are the symptoms of acoustic neuroma

However, your post has given me a great -- or horrible; which it is remains to be seen -- idea. Removing the tach drive only requires removing two screws (and safety wire), leaving two holes to use to mount my as-yet to be designed and fabricated degree wheel holder.What are the symptoms of acoustic neuroma if I used my triumph timing disc I wouldn't even have to multiply by 2 (or divide by π, or whatever) since its angles incorporate the camshaft correction factor.What are the symptoms of acoustic neuroma

I already have bearings in various sizes I could use, as well as oilite material, so I could have something ready in a few hours.What are the symptoms of acoustic neuroma it's your fault for seeding this idea since now I must have this tool. However, since having it isn't essential for addressing the present problem I'll do my best to put it out of my mind until after I get the bike running well.What are the symptoms of acoustic neuroma

Update: the engine is firing at 1.6 mm BTDC at full advance, which is a bit less than 3°. I've already had words with the incompetent rebuilder who it's now apparent didn't sufficiently tighten the pinion when he installed the magneto after rebuilding it.What are the symptoms of acoustic neuroma believe me, he's every bit as upset with himself as I am with him. However, why this resulted in it running terribly below 3k rpm, but seemingly fine above that, I don't know.What are the symptoms of acoustic neuroma but, once again the truism that 90% of carburetor problems are electrical proves, well, true.

With a lot of resolution the details of setting the timing gets complicated.What are the symptoms of acoustic neuroma I use the inductance of the primary to determine when the points open, since that changes from 0.00 (on the mh scale) to ~5 so there's no mistaking it.What are the symptoms of acoustic neuroma however, with a resolution of ~0.1-deg. On the crank angle the inductance doesn't just abruptly jump between those two limits, it sort of oozes between them.What are the symptoms of acoustic neuroma further, if I stop advancing the engine just before the full value of inductance is reached (or anywhere up to that point) and wait, it slowly oozes lower over a period of many seconds.What are the symptoms of acoustic neuroma I think part of that oozing may be due to backlash of the gears relaxing, but some of it may be due to the points rubbing block relaxing under the pressure of being held partially open by the spring.What are the symptoms of acoustic neuroma if I had even ~5x lower resolution, so I could tell the difference between 38-deg. And 39-deg., but no better than that, I wouldn't see these effects.What are the symptoms of acoustic neuroma

If I'm right about the relaxation issues, both would be different in operation than they are when I set the timing statically.What are the symptoms of acoustic neuroma the engine would keep pressure on the gear train so there wouldn't be an opportunity for the backlash to relax, and the rubbing block would take on some steady-state amount of relaxation.What are the symptoms of acoustic neuroma the only way to know how much an effect this would have would be to accurately set the static timing, then check the timing with the engine running.What are the symptoms of acoustic neuroma

The other "detail" is the value of advance to use. Fifty years ago my gold star was tested by the factory at "39 degrees." I can set it to 39.0+/-0.1 degrees, but with today's fuels would it be better to use something other than 39 degrees?What are the symptoms of acoustic neuroma unfortunately, I haven't found any definitive information on this. Yes, there are plenty of unsubstantiated allegations that more/less advance is needed because modern fuels burn slower/faster, but I've yet to find any actual data showing one or the other.What are the symptoms of acoustic neuroma

. I think part of that oozing may be due to backlash of the gears relaxing, but some of it may be due to the points rubbing block relaxing under the pressure of being held partially open by the spring.What are the symptoms of acoustic neuroma if I had even ~5x lower resolution, so I could tell the difference between 38-deg. And 39-deg., but no better than that, I wouldn't see these effects.What are the symptoms of acoustic neuroma

If I'm right about the relaxation issues, both would be different in operation than they are when I set the timing statically.What are the symptoms of acoustic neuroma the engine would keep pressure on the gear train so there wouldn't be an opportunity for the backlash to relax, and the rubbing block would take on some steady-state amount of relaxation.What are the symptoms of acoustic neuroma the only way to know how much an effect this would have would be to accurately set the static timing, then check the timing with the engine running.What are the symptoms of acoustic neuroma

I think you are correct about the various sources of lash contributing to what you are seeing. The workshop manuals always cautioned about rotating the engine in its running direction while checking timing, in order to take up lash in the gears.What are the symptoms of acoustic neuroma and as you say the dynamics of this are going to be quite different when the gear train is driven at speed with the cyclic loading of the cams.What are the symptoms of acoustic neuroma

what are the symptoms of acoustic neuroma