Question about BMW Motorcycles
Much difficulty starting this bike when it is cold. I tickle the carbs for 2 seconds, push the electric starter button, engine spins but does not start. It takes 5 or 6 long start attempt to get the bike started, then it takes minutes before it will idle. Bike is a 1970 BMW R50/5 with only 16,000 miles. Bike is in excellent, unrestored condition. Once the bike starts and warms up there is no problem starting it again. Apparently the person I bought it from got it from the original owner. The person who sold it to me replaced the plugs with NGK plugs and a Chinese battery. I will restore this bike with all original parts. Where do I begin to tackle the cloud start issues?
Hi, Mark probably all it needs is a proper tune up otherwise the usual suspects are:
1. Enrichner system plugged, not properly functioning or improperly operated.
2. Fuel overflow.
3. Restricted fuel supply.
4. Gas cap and or fuel tank not venting properly.
5. Plugged slow jet or passages.
6. Inlet system air leak.
For more information about your issue please visit the websites below. Good luck and have nice day.
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BMW Repair Manual R50 5 R60 5 R75 5 Repro
BMW Motorcycle Parts Fiche OEM BMW Motorcycle Parts online 1970 present BMW
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Posted on Jan 05, 2016
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Posted on Jan 02, 2017
SOURCE: Starter dragging problem
You added an extra ground but did nothing with the positive cable. It's time to replace that one, possibly using better quality cable then stock.
Posted on Nov 20, 2008
SOURCE: Starter dragging problem
Two things come to mind, other than an internal problem with the starter. Diconnect the battery and take the small cover off the solenoid. pull the plunger and spring out and check the 2 internal contacts and the copper washer on the plunger for a badly burned or worn condition. Rebuild kits are available for some models. If not, you can dress up the contacts and the washer. Push the plunger in by hand and see that it hits both contacts at the same time.
Another possibility is the starter clutch. Usually when these fail the starter spins without turning the engine over, but I have seen them cause the symptom you described. Replacement involves removing the starter and dissasembly of the drive end of the starter, but since you were savvy enough to take the initial steps you mentioned, I know you can handle it.
Posted on Dec 25, 2008
i had a simuler problem with my honda cr 250 moto-x bike it would start fine and you could keep it ticking over with the throttle(i have deliberatly unscrewed the tickover in case i come off,it will cut out) when i got on it,it would go for about 400-500 metres then splutter and die and not start again for around 5 mins. i immediatly knew it was a fueling problem. so after stripping the carb and giving it a good clean out i was baffled when i got back on and it still done the same. i then dismantled the fuel tap cleaned it all out and put it back together and tested it,it was very very slow so i unsrewed my fuel cap a little and was greated with the familur gush it should deliver. problem solved! the vent in my fuel cap had crystalised up,so the fuel was coming out but the air was not getting in,causing a vacuum and slowing down the flow and basically emptying the carb quicker than it can fill back up!!! clean your carb,fuel tap and any vents in your cap or tank. if this does not work then your bike must be over fueling or low on compression.
Posted on Sep 18, 2009
Does the start quit turning or does it continue to sound like it's turning? If the starter quits turning, I'd suspect the battery. Take it out and have it tested. Usually no charge for this service at most any auto parts house.
If the starter sounds like it's still turning but the engine isn't, that's an indication that the "starter clutch" is bad inside the starter. This is the "one way bearing" unit that turns the engine to start it but then freewheels when the engine starts. I've seen many of them go bad. If the bike is still under warranty, take it back to the dealer before the warranty runs out. At least have a documented complaint of the problem within the warranty period. That way, if the warranty runs out you may can still get it fixed under the warranty.
Posted on Oct 09, 2009
Testimonial: "Very informative and explained the possible issues in plain English very well. I will check your suggestions follow your advice. Thank You very much."
Check that the clutch is in, kick stand up, and neutral light ablaze. Then try your start button. When you had it running and hit the button, the starter engaged at a slower speed then the bike engine was turning, which led to the stall. The stall means your starter works. If the starter works when the engine is running then it is wiring. Check your kick stand wiring along with the clutch wires which plug in on the handlle bar or where the clutch cable enters the engine.
Posted on Oct 23, 2009
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