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The goal is always the same, proper RPM (I suggest 1025 rpm) for final idle, and the idle mixture at ~1/8th turn CCW from the peak (peak is where additional screwing in (CW) will cause a RPM DEcrease). Usually we see the idle speed being between 1000 and 1300 RPM (engine revolutions per minute) when the engine is at operating temperature, and often as bit higher during warm up. But the correct idle speed depends on the type of engine and the air/fuel ratio, so first step is to consult the user manual.

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Usually we see the idle speed being between 1000 and 1300 RPM (engine revolutions per minute) when the engine is at operating temperature, and often as bit higher during warm up. But the correct idle speed depends on the type of engine and the air/fuel ratio, so first step is to consult the user manual. Screw in the idle-speed screw (4) to obtain a slightly-higher idling speed than normal (about 1200 rpm for a four-stroke engine or about 1400 rpm for a two-stroke); Then adjust the air-adjusting screw (1) to obtain the most even running.

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Nov 08, 2012 · The high idle speed is likely due to one of the following issues: * Vacuum leaks. A vacuum leak in the intake system can often cause an increase in idle speed. Perform a full visual inspection of all rubber hoses, boots, bellows, etc. that carry air, including the crankcase ventilation and fuel tank vent systems.

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Idle speed should be around 1100 RPM. If the idle speed is about right after start and before fully warm, but then the idle drops down when the engine is finally warm, that says to me that the carbs need adjustment. The carbs need to be up at operating temp (say a 15-20 mile ride) before doing the synch. Airheads are notorious about that being off. 2/4 of my Airheads had tight valves that never fully closed. If it were a Japanese bike you wouldn't start with valves, just the nature of the beast. Turn up the idle high enough for it to run. Then turn the idle mixture screw as One Less Harley described.

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In fact, I recommend lightening the weights a bit, to raise the ~3,000 rpm max advance point to 3500 or 3600 RPM. For the 1981 and later BMW electronic ignition, modify the ATU weights slightly; use Accel coils (see my ignition article) with twin tower outputs. Use the last version of the ignition module.

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Nov 14, 2008 · 1984 BMW: engine gets to operating temp..backfiring..idle speed higher… Gauge mode can be used to adjust idle speed with the tachometer function and mixture (carburetor) with the tachometer and/or gauge function. Gauge mode can also be a powerful diagnostic tool. In Gauge mode , if you use the yellow port, the tachometer is calibrated for 4-stroke motors, 1 cylinder per intake.

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Apr 16, 2020 · There are a lot of things which can cause a high idle. For tune ups, always remember valves first, points if you have them, timing, second, carbs last. I must admit, it has been a long time since I had to adjust points and mess with timing on an airhead, but I do remember timing too far advanced at idle can cause a higher rpm.

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Nov 08, 2012 · The high idle speed is likely due to one of the following issues: * Vacuum leaks. A vacuum leak in the intake system can often cause an increase in idle speed. Perform a full visual inspection of all rubber hoses, boots, bellows, etc. that carry air, including the crankcase ventilation and fuel tank vent systems.

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There is no way a BMW Airhead engine will have a problem with the normally used coils, even at 7000 or 8000 RPM. The control over dwell period is the points opening; or, if no points, the mechanism that produces the ignition signal ...and, in a few instances ...the electronics modules that may have dwell circuitry. Dec 14, 2011 · On the older BMW models that do not use electrically operated throttle bodies (fly by wire), there are only a couple of issues that would cause the engine RPM to not return to idle reliably. * Throttle cable sticky, binding or too tight – Check the throttle cable for binding or any other potential interference that could hold the throttle arm ...

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The bike will run reasonable at speed, but it's difficult to hold idle. Get the valves reset to (my suggestion) 0.15mm intake and 0.20mm exhaust. I'd also suggest that you have the head bolts (6 of them) retorqued to be sure you're starting at the proper point.

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2. low to high speed responsive and; 3. repairable. this electronic ignition system is designed to replace point system on cb350-cl350 using stock ignition coil (no condenser /point any more). the system is still using the stock advance mechanism to utilize the speed response (though the hei module also having electronic advance) But the idle speed is still low and with the cooler fall weather I turned off the a/c and the rpms went down to 500rpm and the red oil light flashed a little again before I gave it gas. At 500rpm the car does start to run a little rough too. I understand the BMW specification calls for a 700rpm idle speed.

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An air leak could cause lean idle and hihg rpm. check carb to inlet spigot rubbers for condition and tight clamps. ... BMW Motorcycles ↳ Post 1970 Airheads ... There was an SIB on my car for stalling and the cause was that the idle speed was too low. I raised it and it hasn't stalled since. For Sale: M60B30 intake manifold, M50 intake manifold, 2.81 differential, new OEM upper control arm bushings, 8 M62 fuel injectors.

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Nov 08, 2012 · The high idle speed is likely due to one of the following issues: * Vacuum leaks. A vacuum leak in the intake system can often cause an increase in idle speed. Perform a full visual inspection of all rubber hoses, boots, bellows, etc. that carry air, including the crankcase ventilation and fuel tank vent systems. Feb 16, 2015 · 1982 BMW R100 Airhead Idle phattyescrt. Loading... Unsubscribe from phattyescrt? ... 1978 BMW R100RS Airhead Gold Metalic - Duration: 2:16. Xavier Calderon 9,965 views. 2:16. Jul 08, 2018 · With the engine at 1000 RPM or less, the advance will be very close to “S”. Turn off the motor, loosen the three screws holding the Hall transmitter plate, and tap the plate in a CCW direction from the front to the end of slot travel. Tighten down the three screws and recheck the timing. Be SURE the idle RPM is 1000 or less!

The goal is always the same, proper RPM (I suggest 1025 rpm) for final idle, and the idle mixture at ~1/8th turn CCW from the peak (peak is where additional screwing in (CW) will cause a RPM DEcrease).

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This is particularly so if your engine is worn moderately or more, and/or your normal idle is below 900 rpm, which is a BAD idea. Worn engine bearings allow more oil to flow out of the bearings to the crankcase, causing lowering of oil pressure at low rpm.

Airhead BMW with Dnya Electronic Ignition, won't run at idle or low speed. Runs great at higher RPM. - Answered by a verified Motorcycle Mechanic In fact, I recommend lightening the weights a bit, to raise the ~3,000 rpm max advance point to 3500 or 3600 RPM. For the 1981 and later BMW electronic ignition, modify the ATU weights slightly; use Accel coils (see my ignition article) with twin tower outputs. Use the last version of the ignition module. Nov 02, 2007 · Idle RPM after warm-up is still pissing me off because it is high. I attack the throttle stop screws again but they sure are sensitive. At this point I estimate I have somewhere around 375 hours of labor in this project, which started in December 2006 and ran to now, the end of August 2007. HI BMW e90 / 330i model 2010 , European version Car on cold start has rough idle for some seconds before RPM goes back to stable mode, also car has hesitation on low RPM , or on acceleration I cleaned the throttle body, changed plugs, tested coils, no solution so thought to disconnect MAF... Battle ioNov 14, 2008 · 1984 BMW: engine gets to operating temp..backfiring..idle speed higher… .

OK, as requested, here is a video about what the idle and the air/fuel mixture screws do on an Airhead carb
HI BMW e90 / 330i model 2010 , European version Car on cold start has rough idle for some seconds before RPM goes back to stable mode, also car has hesitation on low RPM , or on acceleration I cleaned the throttle body, changed plugs, tested coils, no solution so thought to disconnect MAF...