Bing type 54/84 experiment

[typ181r90]

Thanks for this information. It may come in handy for my /5 track bike.

for your track bike I'd go with a bigger carb size than stock, like I said I couldn't eke out any more power than the stock ones, you might do better to go for 34-38mm size which they do make

Personally I found some dell'ortos really cheap and they'll be going on my bike next. If you do try and use a bigger carb size than stock I'd be interested in seeing the results. In my case I was only able to find a part of Bing 84s in 32mm size and that's why I experimented with those, the 54s come in bigger sizes but I just couldn't find a good pair anywhere for a price that you could afford to experiment with

The nice thing about these carbs though are that all of the jets are interchangeable, as well as the floats and other parts. Many can even be bought from BMW instead of Bing if you search through the microfiche

[typ181r90]

While you are experimenting,

I'd be curious as to how the velocity stacks worked on your original Carb as well as how the replacement carbs worked with the stock air system.???

the velocity stacks wouldn't fit over the inlets on the stock type 64s so I never got to try that out. That was a shame because those stacks were really nice and I wanted to keep them for the stock ones but oh well. Didn't try to adapt the stock intakes to the carbs because I was never able to get anymore power than stock using the Bing 84s in 32mm. Like I said earlier, I probably would have been able to see a benefit by using a 34mm choke carb or perhaps even a 38, but just wasn't able to find a good pair of carbs to experiment with

[typ181r90]

+ 3K over and over.......

That thread is blatant conspicuous consumerism by a guy who thinks it's just great and the acceptable way to join the "brotherhood"..............Those that support this line of thought are missing the point of the millions of miles that have brought us to the place we are at. Off my soapbox; but I find the thinking that creates this kind of assemblage of parts by non-riders far from acceptable from those of us who layed down the foundation............God bless......Dennis

glad I'm not the only one

[20774]

On the other hand...hmmm...

There are people who DO enjoy that sort of thing...this forum has all kinds of residents. Personnally, I'm a stock-bike kind of guy. Can't say I seek out choppers, cafe rides, farkles, I'd never ride a SS1000 or Iron Butt ride, etc. Some people see outside the box better than I do, though...

Bottom line...if it isn't your cup of joe, don't visit those threads or change the channel. Pretty simple really!!

[Krpntr]

Rant on: I'm a stock kind of guy too, but that is because there is more information available for me to diy. My background is residential remodel and there is an enormous amount of unnecessary money thrown into kitchens and bathrooms and additions. The work may be simple or complex, it does not matter. The pleasure of wrenching or slapping nails or standing back and watching a pro do his thing is all relative. If I wanted to wrench on a cafe bike I would own a Norton. I like to ride and do my own maintenance, but when I am in over my head I do not hesitate to seek help or advice from more knowledgeable individuals. And yes, even pay for the privilege. There is no way I would expect a nurse to change out a bathroom or kitchen sink, nor would I expect him to want to immerse his hands in the petrol-chemicals mechanics are always dipping into. That he has the cash to hire the work out means the money is being spread around. He is getting a beautiful product and people in niche professions are getting their bills paid. All you builders out there will eventually need a nurse. Do you want one with fingernails like mine? I think not. My hat is off to Shane for spreading the wealth and to all you guys for spreading the knowledge. Rant off.

[8ninety8]

Back to the carb thing, my 900 has just turned 300 miles on new rings and a head refurb. The original Dels are running super. ONe thing done during bolt-up was the use of teflon-yellow tape in connecting the venturied spigots to the head, and rigid doweling of the inlet with a screw.

In the foggy past the carbs were loose to actually move a little in the head threads, which I suspect allowed air into the intake that could not be tuned, and I had a heck ov'a time adjusting the idle.

Now, with the inlets sealed, it idles like new, and rips past 6k with abandon. Although I've kept RPMs under redline, exercising it between 4K and 6K. Still runs rich, am not installing one step up 262 midrange jets, as someone had suggested. Rich because when descending steep hill, backing off in third and second gear gives slight backfire, which I kinda like. There's some extra gas in them there headers. Sounds like the old CJ 428. No baiting intended.

That is, standard 38 Dels running through 35mm tapered inlets, standard jets and needle setting, 336 cam, in my mind this bike will run flat out wide open, hoping I balanced those tires correctly. Stock is always a good place to start. Keep the rubber down, head down, one knee back, and wide open eyes.

[20774]

Rich running during break-in is a good thing...it keeps things a tad cooler.

[8ninety8]

Inside of the muffler opening has always given a black wipe to the finger. No tan. Plugs look good. Mileage, haven't checked. First long ride I'll zero the meter and keep track. It used to give about 43-45mpg. Cool tan may be too lean? A little soot means a cool exhaust valve? I can feel the lightened wrist pins under 4K. Less reciprocating weight equals less mass to smooth out the vibes. But a quicker spin of the crank. Same with a drilled flywheel.

Keeping the standard mains and needle position, black tailpipe or no.

[DennisDarrow]

Light tan or creamy coffee brown is PERFECT for plugs and a light grey to nothing exhaust is what you are after. Fantastic that you are there...........God bless.......Dennis