Re: R90s wont idle after carburetor rebuild

["Kris And Scott"]

Hi Kirk
Won’t idle with throttle off.
Still no clues

Thanks
Scott

Scott

Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before.
-Kurt Vonnegut

["Kirk Ratzel"]

Hi Scott,

When you say that you made a “minor rebuild”, what did that involve? Did you remove or replace the jets for instance. Please elaborate a little.

I take it that the slides were removed, perhaps that throttle stop screws as well for cleaning?

Wild guess without knowing more, check that the throttle stop screws are properly adjusted. Also, invest in a carb synchrometer / balancer to help take out the guesswork. Cheap and available on Amazon or eBay.

The experts will tell you they do it by ear. Well good for them, but too much trial and error for this occasional mechanic.

Best regards, Kirk

["Dennis Grossman"]

Building from Kirk's suggestion, I would love to hear group recommendations
for a good carb balancer / sychronizer tool to use on the BMWs. Also best
way to alternate between cylinders without having to pull the plug wires
every time.
Thanks,
Denny

["Robert Fleischer dba Fleischer's Service"]

Arguably the simplest, and by far the cheapest, is two insulated screwdrivers and two adapters that allow the spark plug caps to be connected to the spark plugs SECURELY, yet allow the spark plugs to be shorted to ground (via the screwdrivers, alternatively). The indicating instrument will be your ears, and the tachometer.
https://bmwmotorcycletech.info/synchcarbs.htm

Snowbum (AKA Robert Fleischer)
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Learn from the mistakes of others, because you cannot
live long enough to make them all yourself!
A large number of good tests, inspections, measurements and both good
and bad experiences, are more valuable than many opinions, particularly
if found in a Facebook Group.
ABC 1843; MOA Life 17058; AMA Charter Life 73254; etc.
Carson City, Nevada
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♥

["Nick Ploeg"]

Best I've used:https://katdash.com/harmonizer/Kind regards Nick Ploeg sunny NZ

["Mac Kirkpatrick"]

You can even purchase the shorting gazinkos, but making them out of wheel
spokes and nipples is gratifying:
https://www.euromotoelectrics.com/produ ... nctool.htm


Mac Kirkpatrick
Glenmoore, PA

"After all, what is adventure, but inconvenience, properly regarded?"
C. Donahue

["Bill Potter"]

Sold out. Sadly, no more on the way until a redesign happens. One of the critical parts is NLA.

Bill in NH

["Nick Ploeg"]

Hi BillThat's disappointing. These harmonisers are simple and quick to use, as well as accurate. I doubt they'd be available second hand either, other than via a deceased estate.Kind regards Nick Ploeg sunny NZ

["Kirk Ratzel"]

This is the hot set up, no fancy electronics or mods needed - just air flow:
https://www.amazon.com/Carburetor-Synch ... B07P32M7NV

Best regards, Kirk Ratzel

["heidi and steve"]

I have found my ears manage to do as good a job of balance as any the various meters I have tried.
It may be because I am half deaf and some of the extraneous noises just aren’t heard.
Cheers,
Steve.