You need to drill slide lift holes 0.04~0.06mm larger with the thicker diaphragms.
The slides have different size lift holes in these ebay carbs, not surprising. 3.52 and 3.58mm (.0141"). Wouldn't cha know, that's the one size drill bit I'm missing, it falls between a #27 and #28.
Mine makes no noise at all. Just take out the hearing aids.
I'm thinking, that must be you guys' secret to good concentration. Silence is golden, they say. Between the tinnitus and Buck Rodgers buzz from the Ultrasonic, it's no wonder I can't afford to pay attention.
I'm too broke to pay attention
Yep, my take-home pay won't even take me home.
The slides have different size lift holes in these ebay carbs, not surprising. 3.52 and 3.58mm (.0141"). Wouldn't cha know, that's the one size drill bit I'm missing, it falls between a #27 and #28.
The 25% Pinesol, original flavor, got rid of the fat boils and no white crusties. It did mildly make the finish less glossy. More like the Simplegreen Extreme (50%). I'm well over a half dozen 18min. cycles now, but they are getting pretty clean.
I read the LPS cleaner did not recommend use on aluminum or magnesium. Maybe good old Cascade dishwasher powder might be good too.
... and thus the reason I am shopping for a micrometer. I'm glad ballbearian is doing the experimental hole drilling
The only time I needed my mic was to get around the outer rib on the diaphragms to measure their thickness in the middle. 95% of the time I just grab my digital slide calipers but the parallel jaws won't work for that but they do have the small tips for measuring the inside diameter of holes.... and thus the reason I am shopping for a micrometer. I'm glad ballbearian is doing the experimental hole drilling
It also has a zeroing button to reset accuracy or to measure just the differences between two items. It does not have a vernier scale for manual measuring but 357 watch batteries are common as dirt.
Thanks. Concise, I need to practice that.
The only time I needed my mic was to get around the outer rib on the diaphragms to measure their thickness in the middle. 95% of the time I just grab my digital slide calipers but the parallel jaws won't work for that but they do have the small tips for measuring the inside diameter of holes.
The decent $25-35 slide caliper I have will resolve to hundredths of a mm, or 5 ten thousandths of an inch and will convert from mm to inch, or back, with the push of a button. Keeps my arithmetic brain cells lazy.
It's definitely my most important measuring tool. My 25mm mic was purchased back in my FIAT days to measure valve tappet shims but its too small to measure the snap bore gauges for our bike cylinders, I'd need like a 100mm for that. I bought the snap bore gauge set that Oldtimer wanted to sell but haven't bought a big mic to use with that yet.
So, for this job, I'm using the inside tips of the slide, which is hard to do with consistency and accuracy, backed up by finding the closest drill size from my number, letter, fractional drill bit index set from HF. This set says that a #28 bit is .140" (3.56mm) but I measure it at 3.50mm with the slide and 3.52 mm with the mic. I figure either all these HF bits are slightly undersized or (more likely maybe) there is a convention of working tolerance involved when actually drilling, such that holes end up being very slightly larger than the measured diameter of the bit. IOW, this 3.50mm bit may drill 3.56mm holes, just guessing. I'm missing the next larger numbered size, #27, which is supposed to be .144" (3.66mm), but I'd bet that it is also undersized if measured, but may drill 3.66mm holes.
I'm so glad I don't live inside a real precision machinists head, I just want to fix these carbs. Here is what I've found, before I lose it.
SUMMARY: of lift holes and diaphragms (in a nutshell, from 4 sets of carbs).
---Almost all the diaphragm thicknesses are .27mm, + or - .02-.05mm in different spots on the same item. Except the new repro ones from Scrambler which are almost a tenth of a mm thicker.
---Almost all the lift holes in the slides are 3.50mm, +or- .02mm. Except for one of the slides from my ebay carb set, that is larger, at 3.58 measured only with the inside tips of my slide caliper, not a precision pin gauge set and micrometer.
GOAL: Apply PJ's logic and remedy to enlarge slide lift holes to account for thicker aftermarket diaphragms.
--- One of the ebay slides is already at the increased amount recommended by PJ (+.04-.06mm). I'll leave poor little Wellenuff alone.
--- Other slide needs reamed or drilled (with a bit I don't have) to match the other ebay slide. I may have a conniption if forced to watch a bunch of youtube watchmaker videos.
Other common-sense considerations (doncha hate that guy).
-All lift air must pass thru the plastic golf tee anyway, #16 on parts diagram, 16132-286-004, no variants listed. Would the 4 holes in this need reamed too?
-David Silver Spares lists replacement slides with diaphragms at $75 each (16111-286-034) or $235.29 each (16111-287-004, special order only). No specs available on hole diameters or diaphragm thickness, although probably more trustworthy than congressional testimony. An expensive gamble for me but not Congress because it's not their money anyway.
-Maybe Scrambler's diaphragms are actually as flaccid as OEM anyways and as I've heard said, 'it's not the meat, it's the motion'.
Makes me long for the mindless simplicity of twisting nipples and rust removal.
The differing hole sizes on your factory slider pair seems odd to me. I will sample a few sliders I have with my pin set and see what's what.
Come to think of it, not sure my pin set goes that large. I'll take a looksee anyhow.
Great math tip. I'll hold off on willynilly hole drilling. Besides, I may have one of those rare early slides that DSS sells for a precious price.
And where would PJ get a drill bit, if my deluxe set (numbered, lettered, fractional) doesn't have that size?
Maybe he had sooper secret clearance access to the Honda factory tool crib vault.
Do you have Metric drill bits?
No, but 3.58mm ?
Nice. I think I paid more for my NSK back in 1980. Also handy for checking feeler blades when sizes worn off or you don't trust em.
The slides have different size lift holes in these ebay carbs, not surprising. 3.52 and 3.58mm (.0141"). Wouldn't cha know, that's the one size drill bit I'm missing, it falls between a #27 and #28.
The 25% Pinesol, original flavor, got rid of the fat boils and no white crusties. It did mildly make the finish less glossy. More like the Simplegreen Extreme (50%). I'm well over a half dozen 18min. cycles now, but they are getting pretty clean.
I read the LPS cleaner did not recommend use on aluminum or magnesium. Maybe good old Cascade dishwasher powder might be good too.
The slides have different size lift holes in these ebay carbs, not surprising. 3.52 and 3.58mm (.0141"). Wouldn't cha know, that's the one size drill bit I'm missing, it falls between a #27 and #28.
The 25% Pinesol, original flavor, got rid of the fat boils and no white crusties. It did mildly make the finish less glossy. More like the Simplegreen Extreme (50%). I'm well over a half dozen 18min. cycles now, but they are getting pretty clean.
I read the LPS cleaner did not recommend use on aluminum or magnesium. Maybe good old Cascade dishwasher powder might be good too.
No, ballbearian just forgot to zero out his caliper
That is a special micrometer for measuring the thickness of curved parts, like solid connecting rod bearings, or tubing wall thickness. Notice the ball tips on the anvil and spindle.
Well, they do dilate the closer they get to giving birth.No, ballbearian just forgot to zero out his caliper
I just noticed that. One will be careful, then to maintain perpendicularity to tangent, or observations will be prejudiced.
Good eye fxray! I saw the ball tips and thought this will be a good universal useage tool. Any reason why this cannot do double duty as a flat measurement tool?
Exactly my thinking.
Actually, I think you may have inserted the jaws too far and the back edge was making contact.No, ballbearian just forgot to zero out his caliper
Stayed awake in English class, or perhaps in Physics 102? Most impressive.
It's all pretend, but the company around here is inspiring.
I think you'll be good. Just the fact that both sets of holes are now the same size should be a good thing, and how it reacts with the new diaphragms remains to be seen.
Being thickerer than most is entertaining. Oh well, I better climb back up on the turnip truck.
You're the smartest and most thoughtful turnip truck castoff I've seen.
He's in and out as his life allows with the grandchild supervision duties.
How much is Mikuni paying you to talk that smack.You guys don't know anything... just stretch the spring so it is an inch longer and the slide holes will be compensated for.
It does look kind of funny, like ladies at the beauty shops back in the day setting curls or something.I still have this can of Tite Seal Aviator Gasket ......tar, from the late 70's. It's still easy to make a nasty mess with too, which I did, and put too much on one bowl. I'll clean the excess off but I'll put a light coat of grease on the body so it doesn't stick too well to that side too. That is a piece of clear plastic from a take out food container to keep pressure with the clips.
There may be a fat slice of humble pie coming my way for this.
That's very kind of you Jim to offer the nice gasket Orings but I will order some myself to have for the other carb sets to be done later, or if this doesn't work out.
It does look kind of funny, like ladies at the beauty shops back in the day setting curls or something.
I'll probably be cleaning up all the Dippity-Do until the good ones arrive from Sirius.It does look kind of funny, like ladies at the beauty shops back in the day setting curls or something.
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Now there's a blast from the past.
